由于在本地开发环境上每次修改mybatis xml文件都需要手动重启服务，调试的很麻烦，所以需要热加载xml文件来避免浪费时间，于是网上搜一下资料，看了下有一大堆，但试了下真正能跑起来没有（大都代码没给全），故参考了改了下。
首先确定 mybatis 修改的类：
XMLMapperBuilder（默认xml加载后不会再次加载了，修改此逻辑）
Configuration（重写StrictMap put方法，删除原来加载的数据，重新加载）
SqlSessionFactoryBean（启动刷新线程）
1、在 src 下面建立与 myabtis 上述相同目录的类（tomcat 启动的时候会先加载classes目录下的文件，然后才会加载lib下面的jar包，根据类加载机制，加载了src下面同目录后的类就不会再加载jar包里面的类了）。
2、代码如下：
/* * Copyright 2010-2013 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.mybatis.spring; import org.apache.ibatis.builder.xml.XMLConfigBuilder; import org.apache.ibatis.builder.xml.XMLMapperBuilder; import org.apache.ibatis.executor.ErrorContext; import org.apache.ibatis.logging.Log; import org.apache.ibatis.logging.LogFactory; import org.apache.ibatis.mapping.DatabaseIdProvider; import org.apache.ibatis.mapping.Environment; import org.apache.ibatis.plugin.Interceptor; import org.apache.ibatis.reflection.factory.ObjectFactory; import org.apache.ibatis.reflection.wrapper.ObjectWrapperFactory; import org.apache.ibatis.session.Configuration; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.apache.ibatis.transaction.TransactionFactory; import org.apache.ibatis.type.TypeHandler; import org.mybatis.spring.transaction.SpringManagedTransactionFactory; import org.springframework.beans.factory.FactoryBean; import org.springframework.beans.factory.InitializingBean; import org.springframework.context.ApplicationEvent; import org.springframework.context.ApplicationListener; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.event.ContextRefreshedEvent; import org.springframework.core.NestedIOException; import org.springframework.core.io.FileSystemResource; import org.springframework.core.io.Resource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.core.io.support.ResourcePatternResolver; import org.springframework.core.type.classreading.CachingMetadataReaderFactory; import org.springframework.core.type.classreading.MetadataReader; import org.springframework.core.type.classreading.MetadataReaderFactory; import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy; import org.springframework.util.ClassUtils; import javax.sql.DataSource; import java.io.IOException; import java.sql.SQLException; import java.util.HashSet; import java.util.Properties; import java.util.Set; import static org.springframework.util.Assert.notNull; import static org.springframework.util.ObjectUtils.isEmpty; import static org.springframework.util.StringUtils.hasLength; import static org.springframework.util.StringUtils.tokenizeToStringArray; /** * {@code FactoryBean} that creates an MyBatis {@code SqlSessionFactory}. This * is the usual way to set up a shared MyBatis {@code SqlSessionFactory} in a * Spring application context; the SqlSessionFactory can then be passed to * MyBatis-based DAOs via dependency injection. * * Either {@code DataSourceTransactionManager} or {@code JtaTransactionManager} * can be used for transaction demarcation in combination with a * {@code SqlSessionFactory}. JTA should be used for transactions which span * multiple databases or when container managed transactions (CMT) are being * used. * * @author Putthibong Boonbong * @author Hunter Presnall * @author Eduardo Macarron * * @see #setConfigLocation * @see #setDataSource * @version $Id$ * @desctiption 刷新xml文件 */ public class SqlSessionFactoryBean implements FactoryBean<SqlSessionFactory>, InitializingBean, ApplicationListener<ApplicationEvent> { private static final Log logger = LogFactory .getLog(SqlSessionFactoryBean.class); private Resource configLocation; private Resource[] mapperLocations; private DataSource dataSource; private TransactionFactory transactionFactory; private Properties configurationProperties; private SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder(); private SqlSessionFactory sqlSessionFactory; private String environment = SqlSessionFactoryBean.class.getSimpleName(); // EnvironmentAware requires spring 3.1 private boolean failFast; private Interceptor[] plugins; private TypeHandler<?>[] typeHandlers; private String typeHandlersPackage; private Class<?>[] typeAliases; private String typeAliasesPackage; private Class<?> typeAliasesSuperType; private DatabaseIdProvider databaseIdProvider; // issue #19. No default provider. private ObjectFactory objectFactory; private ObjectWrapperFactory objectWrapperFactory; /** * Sets the ObjectFactory. * * @since 1.1.2 * @param objectFactory */ public void setObjectFactory(ObjectFactory objectFactory) { this.objectFactory = objectFactory; } /** * Sets the ObjectWrapperFactory. * * @since 1.1.2 * @param objectWrapperFactory */ public void setObjectWrapperFactory( ObjectWrapperFactory objectWrapperFactory) { this.objectWrapperFactory = objectWrapperFactory; } /** * Gets the DatabaseIdProvider * * @since 1.1.0 * @return */ public DatabaseIdProvider getDatabaseIdProvider() { return databaseIdProvider; } /** * Sets the DatabaseIdProvider. As of version 1.2.2 this variable is not * initialized by default. * * @since 1.1.0 * @param databaseIdProvider */ public void setDatabaseIdProvider(DatabaseIdProvider databaseIdProvider) { this.databaseIdProvider = databaseIdProvider; } /** * Mybatis plugin list. * * @since 1.0.1 * * @param plugins * list of plugins * */ public void setPlugins(Interceptor[] plugins) { this.plugins = plugins; } /** * Packages to search for type aliases. * * @since 1.0.1 * * @param typeAliasesPackage * package to scan for domain objects * */ public void setTypeAliasesPackage(String typeAliasesPackage) { this.typeAliasesPackage = typeAliasesPackage; } /** * Super class which domain objects have to extend to have a type alias * created. No effect if there is no package to scan configured. * * @since 1.1.2 * * @param typeAliasesSuperType * super class for domain objects * */ public void setTypeAliasesSuperType(Class<?> typeAliasesSuperType) { this.typeAliasesSuperType = typeAliasesSuperType; } /** * Packages to search for type handlers. * * @since 1.0.1 * * @param typeHandlersPackage * package to scan for type handlers * */ public void setTypeHandlersPackage(String typeHandlersPackage) { this.typeHandlersPackage = typeHandlersPackage; } /** * Set type handlers. They must be annotated with {@code MappedTypes} and * optionally with {@code MappedJdbcTypes} * * @since 1.0.1 * * @param typeHandlers * Type handler list */ public void setTypeHandlers(TypeHandler<?>[] typeHandlers) { this.typeHandlers = typeHandlers; } /** * List of type aliases to register. They can be annotated with * {@code Alias} * * @since 1.0.1 * * @param typeAliases * Type aliases list */ public void setTypeAliases(Class<?>[] typeAliases) { this.typeAliases = typeAliases; } /** * If true, a final check is done on Configuration to assure that all mapped * statements are fully loaded and there is no one still pending to resolve * includes. Defaults to false. * * @since 1.0.1 * * @param failFast * enable failFast */ public void setFailFast(boolean failFast) { this.failFast = failFast; } /** * Set the location of the MyBatis {@code SqlSessionFactory} config file. A * typical value is "WEB-INF/mybatis-configuration.xml". */ public void setConfigLocation(Resource configLocation) { this.configLocation = configLocation; } /** * Set locations of MyBatis mapper files that are going to be merged into * the {@code SqlSessionFactory} configuration at runtime. * * This is an alternative to specifying "<sqlmapper>" entries in an * MyBatis config file. This property being based on Spring's resource * abstraction also allows for specifying resource patterns here: e.g. * "classpath*:sqlmap/*-mapper.xml". */ public void setMapperLocations(Resource[] mapperLocations) { this.mapperLocations = mapperLocations; } /** * Set optional properties to be passed into the SqlSession configuration, * as alternative to a {@code <properties>} tag in the configuration * xml file. This will be used to resolve placeholders in the config file. */ public void setConfigurationProperties( Properties sqlSessionFactoryProperties) { this.configurationProperties = sqlSessionFactoryProperties; } /** * Set the JDBC {@code DataSource} that this instance should manage * transactions for. The {@code DataSource} should match the one used by the * {@code SqlSessionFactory}: for example, you could specify the same JNDI * DataSource for both. * * A transactional JDBC {@code Connection} for this {@code DataSource} will * be provided to application code accessing this {@code DataSource} * directly via {@code DataSourceUtils} or * {@code DataSourceTransactionManager}. * * The {@code DataSource} specified here should be the target * {@code DataSource} to manage transactions for, not a * {@code TransactionAwareDataSourceProxy}. Only data access code may work * with {@code TransactionAwareDataSourceProxy}, while the transaction * manager needs to work on the underlying target {@code DataSource}. If * there's nevertheless a {@code TransactionAwareDataSourceProxy} passed in, * it will be unwrapped to extract its target {@code DataSource}. * */ public void setDataSource(DataSource dataSource) { if (dataSource instanceof TransactionAwareDataSourceProxy) { // If we got a TransactionAwareDataSourceProxy, we need to perform // transactions for its underlying target DataSource, else data // access code won't see properly exposed transactions (i.e. // transactions for the target DataSource). this.dataSource = ((TransactionAwareDataSourceProxy) dataSource) .getTargetDataSource(); } else { this.dataSource = dataSource; } } /** * Sets the {@code SqlSessionFactoryBuilder} to use when creating the * {@code SqlSessionFactory}. * * This is mainly meant for testing so that mock SqlSessionFactory classes * can be injected. By default, {@code SqlSessionFactoryBuilder} creates * {@code DefaultSqlSessionFactory} instances. * */ public void setSqlSessionFactoryBuilder( SqlSessionFactoryBuilder sqlSessionFactoryBuilder) { this.sqlSessionFactoryBuilder = sqlSessionFactoryBuilder; } /** * Set the MyBatis TransactionFactory to use. Default is * {@code SpringManagedTransactionFactory} * * The default {@code SpringManagedTransactionFactory} should be appropriate * for all cases: be it Spring transaction management, EJB CMT or plain JTA. * If there is no active transaction, SqlSession operations will execute SQL * statements non-transactionally. * * <b>It is strongly recommended to use the default * {@code TransactionFactory}.</b> If not used, any attempt at getting an * SqlSession through Spring's MyBatis framework will throw an exception if * a transaction is active. * * @see SpringManagedTransactionFactory * @param transactionFactory * the MyBatis TransactionFactory */ public void setTransactionFactory(TransactionFactory transactionFactory) { this.transactionFactory = transactionFactory; } /** * <b>NOTE:</b> This class <em>overrides</em> any {@code Environment} you * have set in the MyBatis config file. This is used only as a placeholder * name. The default value is * {@code SqlSessionFactoryBean.class.getSimpleName()}. * * @param environment * the environment name */ public void setEnvironment(String environment) { this.environment = environment; } /** * {@inheritDoc} */ @Override public void afterPropertiesSet() throws Exception { notNull(dataSource, "Property 'dataSource' is required"); notNull(sqlSessionFactoryBuilder, "Property 'sqlSessionFactoryBuilder' is required"); this.sqlSessionFactory = buildSqlSessionFactory(); } /** * Build a {@code SqlSessionFactory} instance. * * The default implementation uses the standard MyBatis * {@code XMLConfigBuilder} API to build a {@code SqlSessionFactory} * instance based on an Reader. * * @return SqlSessionFactory * @throws IOException * if loading the config file failed */ protected SqlSessionFactory buildSqlSessionFactory() throws IOException { Configuration configuration; XMLConfigBuilder xmlConfigBuilder = null; if (this.configLocation != null) { xmlConfigBuilder = new XMLConfigBuilder( this.configLocation.getInputStream(), null, this.configurationProperties); configuration = xmlConfigBuilder.getConfiguration(); } else { if (logger.isDebugEnabled()) { logger.debug("Property 'configLocation' not specified, using default MyBatis Configuration"); } configuration = new Configuration(); configuration.setVariables(this.configurationProperties); } if (this.objectFactory != null) { configuration.setObjectFactory(this.objectFactory); } if (this.objectWrapperFactory != null) { configuration.setObjectWrapperFactory(this.objectWrapperFactory); } if (hasLength(this.typeAliasesPackage)) { // TODO 支持自定义通配符 String[] typeAliasPackageArray; if (typeAliasesPackage.contains("*") && !typeAliasesPackage.contains(",") && !typeAliasesPackage.contains(";")) { typeAliasPackageArray = convertTypeAliasesPackage(typeAliasesPackage); } else { typeAliasPackageArray = tokenizeToStringArray(this.typeAliasesPackage, ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS); } if (typeAliasPackageArray == null) { throw new IOException("not find typeAliasesPackage:" + typeAliasesPackage); } for (String packageToScan : typeAliasPackageArray) { configuration.getTypeAliasRegistry().registerAliases(packageToScan, typeAliasesSuperType == null ? Object.class : typeAliasesSuperType); if (logger.isDebugEnabled()) { logger.debug("Scanned package: '" + packageToScan + "' for aliases"); } } } if (!isEmpty(this.typeAliases)) { for (Class<?> typeAlias : this.typeAliases) { configuration.getTypeAliasRegistry().registerAlias(typeAlias); if (logger.isDebugEnabled()) { logger.debug("Registered type alias: '" + typeAlias + "'"); } } } if (!isEmpty(this.plugins)) { for (Interceptor plugin : this.plugins) { configuration.addInterceptor(plugin); if (logger.isDebugEnabled()) { logger.debug("Registered plugin: '" + plugin + "'"); } } } if (hasLength(this.typeHandlersPackage)) { String[] typeHandlersPackageArray = tokenizeToStringArray( this.typeHandlersPackage, ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS); for (String packageToScan : typeHandlersPackageArray) { configuration.getTypeHandlerRegistry().register(packageToScan); if (logger.isDebugEnabled()) { logger.debug("Scanned package: '" + packageToScan + "' for type handlers"); } } } if (!isEmpty(this.typeHandlers)) { for (TypeHandler<?> typeHandler : this.typeHandlers) { configuration.getTypeHandlerRegistry().register(typeHandler); if (logger.isDebugEnabled()) { logger.debug("Registered type handler: '" + typeHandler + "'"); } } } if (xmlConfigBuilder != null) { try { xmlConfigBuilder.parse(); if (logger.isDebugEnabled()) { logger.debug("Parsed configuration file: '" + this.configLocation + "'"); } } catch (Exception ex) { throw new NestedIOException("Failed to parse config resource: " + this.configLocation, ex); } finally { ErrorContext.instance().reset(); } } if (this.transactionFactory == null) { this.transactionFactory = new SpringManagedTransactionFactory(); } Environment environment = new Environment(this.environment, this.transactionFactory, this.dataSource); configuration.setEnvironment(environment); if (this.databaseIdProvider != null) { try { configuration.setDatabaseId(this.databaseIdProvider .getDatabaseId(this.dataSource)); } catch (SQLException e) { throw new NestedIOException("Failed getting a databaseId", e); } } String location = null; if (!isEmpty(this.mapperLocations)) { for (Resource mapperLocation : this.mapperLocations) { if (location == null && mapperLocation instanceof FileSystemResource) { location = mapperLocation.toString(); } if (mapperLocation == null) { continue; } try { XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder( mapperLocation.getInputStream(), configuration, mapperLocation.toString(), configuration.getSqlFragments()); xmlMapperBuilder.parse(); } catch (Exception e) { e.printStackTrace(); // 出现错误抛出异常 throw new NestedIOException( "Failed to parse mapping resource: '" + mapperLocation + "'", e); } finally { ErrorContext.instance().reset(); } if (logger.isDebugEnabled()) { logger.debug("Parsed mapper file: '" + mapperLocation + "'"); } } } else { if (logger.isDebugEnabled()) { logger.debug("Property 'mapperLocations' was not specified or no matching resources found"); } } //启动定时器 new org.apache.ibatis.thread.RefreshRunnable(mapperLocations, configuration).run(); return this.sqlSessionFactoryBuilder.build(configuration); } /** * {@inheritDoc} */ @Override public SqlSessionFactory getObject() throws Exception { if (this.sqlSessionFactory == null) { afterPropertiesSet(); } return this.sqlSessionFactory; } /** * {@inheritDoc} */ public Class<? extends SqlSessionFactory> getObjectType() { return this.sqlSessionFactory == null ? SqlSessionFactory.class : this.sqlSessionFactory.getClass(); } /** * {@inheritDoc} */ public boolean isSingleton() { return true; } /** * {@inheritDoc} */ public void onApplicationEvent(ApplicationEvent event) { if (failFast && event instanceof ContextRefreshedEvent) { // fail-fast -> check all statements are completed this.sqlSessionFactory.getConfiguration().getMappedStatementNames(); } } /** * 重新加载 xmlMapper * @param inputStream * @param resource * @param configuration * @throws NestedIOException */ public static void refresh(java.io.InputStream inputStream, String resource, Configuration configuration) throws NestedIOException { try { XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder( inputStream, configuration, resource, configuration.getSqlFragments()); xmlMapperBuilder.parse1(); } catch (Exception e) { throw new NestedIOException("Failed to parse mapping resource: '" + resource + "'", e); } finally { ErrorContext.instance().reset(); } } public static String[] convertTypeAliasesPackage(String typeAliasesPackage) throws IOException{ ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(); MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resolver); String pkg = "classpath*:" + ClassUtils.convertClassNameToResourcePath(typeAliasesPackage) + "/*.class"; try { Set<String> set = new HashSet<>(); Resource[] resources = resolver.getResources(pkg); if(resources != null && resources.length > 0) { Resource[] arr = resources; int len = resources.length; for(int i = 0; i < len; ++i) { Resource resource = arr[i]; if(resource.isReadable()) { MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(resource); set.add(Class.forName(metadataReader.getClassMetadata().getClassName()).getPackage().getName()); } } } if(!set.isEmpty()) { return set.toArray(new String[0]); } else { throw new IOException("not find typeAliasesPackage:" + pkg); } } catch (Exception var11) { throw new IOException("not find typeAliasesPackage:" + pkg); } } }
/* * Copyright 2009-2014 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.ibatis.session; import org.apache.ibatis.binding.MapperRegistry; import org.apache.ibatis.builder.CacheRefResolver; import org.apache.ibatis.builder.ResultMapResolver; import org.apache.ibatis.builder.annotation.MethodResolver; import org.apache.ibatis.builder.xml.XMLStatementBuilder; import org.apache.ibatis.cache.Cache; import org.apache.ibatis.cache.decorators.FifoCache; import org.apache.ibatis.cache.decorators.LruCache; import org.apache.ibatis.cache.decorators.SoftCache; import org.apache.ibatis.cache.decorators.WeakCache; import org.apache.ibatis.cache.impl.PerpetualCache; import org.apache.ibatis.datasource.jndi.JndiDataSourceFactory; import org.apache.ibatis.datasource.pooled.PooledDataSourceFactory; import org.apache.ibatis.datasource.unpooled.UnpooledDataSourceFactory; import org.apache.ibatis.executor.*; import org.apache.ibatis.executor.keygen.KeyGenerator; import org.apache.ibatis.executor.loader.ProxyFactory; import org.apache.ibatis.executor.loader.cglib.CglibProxyFactory; import org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory; import org.apache.ibatis.executor.parameter.ParameterHandler; import org.apache.ibatis.executor.resultset.DefaultResultSetHandler; import org.apache.ibatis.executor.resultset.ResultSetHandler; import org.apache.ibatis.executor.statement.RoutingStatementHandler; import org.apache.ibatis.executor.statement.StatementHandler; import org.apache.ibatis.logging.Log; import org.apache.ibatis.logging.LogFactory; import org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl; import org.apache.ibatis.logging.jdk14.Jdk14LoggingImpl; import org.apache.ibatis.logging.log4j.Log4jImpl; import org.apache.ibatis.logging.log4j2.Log4j2Impl; import org.apache.ibatis.logging.nologging.NoLoggingImpl; import org.apache.ibatis.logging.slf4j.Slf4jImpl; import org.apache.ibatis.logging.stdout.StdOutImpl; import org.apache.ibatis.mapping.*; import org.apache.ibatis.parsing.XNode; import org.apache.ibatis.plugin.Interceptor; import org.apache.ibatis.plugin.InterceptorChain; import org.apache.ibatis.reflection.MetaObject; import org.apache.ibatis.reflection.factory.DefaultObjectFactory; import org.apache.ibatis.reflection.factory.ObjectFactory; import org.apache.ibatis.reflection.wrapper.DefaultObjectWrapperFactory; import org.apache.ibatis.reflection.wrapper.ObjectWrapperFactory; import org.apache.ibatis.scripting.LanguageDriver; import org.apache.ibatis.scripting.LanguageDriverRegistry; import org.apache.ibatis.scripting.defaults.RawLanguageDriver; import org.apache.ibatis.scripting.xmltags.XMLLanguageDriver; import org.apache.ibatis.transaction.Transaction; import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory; import org.apache.ibatis.transaction.managed.ManagedTransactionFactory; import org.apache.ibatis.type.JdbcType; import org.apache.ibatis.type.TypeAliasRegistry; import org.apache.ibatis.type.TypeHandlerRegistry; import java.util.*; /** * @author Clinton Begin * @description 重写put，实现刷新的功能 */ public class Configuration { protected Environment environment; protected boolean safeRowBoundsEnabled = false; protected boolean safeResultHandlerEnabled = true; protected boolean mapUnderscoreToCamelCase = false; protected boolean aggressiveLazyLoading = true; protected boolean multipleResultSetsEnabled = true; protected boolean useGeneratedKeys = false; protected boolean useColumnLabel = true; protected boolean cacheEnabled = true; protected boolean callSettersOnNulls = false; protected String logPrefix; protected Class<? extends Log> logImpl; protected LocalCacheScope localCacheScope = LocalCacheScope.SESSION; protected JdbcType jdbcTypeForNull = JdbcType.OTHER; protected Set<String> lazyLoadTriggerMethods = new HashSet<String>( Arrays.asList("equals", "clone", "hashCode", "toString")); protected Integer defaultStatementTimeout; protected ExecutorType defaultExecutorType = ExecutorType.SIMPLE; protected AutoMappingBehavior autoMappingBehavior = AutoMappingBehavior.PARTIAL; protected Properties variables = new Properties(); protected ObjectFactory objectFactory = new DefaultObjectFactory(); protected ObjectWrapperFactory objectWrapperFactory = new DefaultObjectWrapperFactory(); protected MapperRegistry mapperRegistry = new MapperRegistry(this); protected boolean lazyLoadingEnabled = false; protected ProxyFactory proxyFactory; protected String databaseId; /** * Configuration factory class. Used to create Configuration for loading * deserialized unread properties. * * @see <a * href='https://code.google.com/p/mybatis/issues/detail?id=300'>Issue * 300</a> (google code) */ protected Class<?> configurationFactory; protected final InterceptorChain interceptorChain = new InterceptorChain(); protected final TypeHandlerRegistry typeHandlerRegistry = new TypeHandlerRegistry(); protected final TypeAliasRegistry typeAliasRegistry = new TypeAliasRegistry(); protected final LanguageDriverRegistry languageRegistry = new LanguageDriverRegistry(); protected final Map<String, MappedStatement> mappedStatements = new StrictMap<MappedStatement>( "Mapped Statements collection"); protected final Map<String, Cache> caches = new StrictMap<Cache>( "Caches collection"); protected final Map<String, ResultMap> resultMaps = new StrictMap<ResultMap>( "Result Maps collection"); protected final Map<String, ParameterMap> parameterMaps = new StrictMap<ParameterMap>( "Parameter Maps collection"); protected final Map<String, KeyGenerator> keyGenerators = new StrictMap<KeyGenerator>( "Key Generators collection"); protected final Set<String> loadedResources = new HashSet<String>(); protected final Map<String, XNode> sqlFragments = new StrictMap<XNode>( "XML fragments parsed from previous mappers"); protected final Collection<XMLStatementBuilder> incompleteStatements = new LinkedList<XMLStatementBuilder>(); protected final Collection<CacheRefResolver> incompleteCacheRefs = new LinkedList<CacheRefResolver>(); protected final Collection<ResultMapResolver> incompleteResultMaps = new LinkedList<ResultMapResolver>(); protected final Collection<MethodResolver> incompleteMethods = new LinkedList<MethodResolver>(); /* * A map holds cache-ref relationship. The key is the namespace that * references a cache bound to another namespace and the value is the * namespace which the actual cache is bound to. */ protected final Map<String, String> cacheRefMap = new HashMap<String, String>(); public Configuration(Environment environment) { this(); this.environment = environment; } public Configuration() { typeAliasRegistry.registerAlias("JDBC", JdbcTransactionFactory.class); typeAliasRegistry.registerAlias("MANAGED", ManagedTransactionFactory.class); typeAliasRegistry.registerAlias("JNDI", JndiDataSourceFactory.class); typeAliasRegistry .registerAlias("POOLED", PooledDataSourceFactory.class); typeAliasRegistry.registerAlias("UNPOOLED", UnpooledDataSourceFactory.class); typeAliasRegistry.registerAlias("PERPETUAL", PerpetualCache.class); typeAliasRegistry.registerAlias("FIFO", FifoCache.class); typeAliasRegistry.registerAlias("LRU", LruCache.class); typeAliasRegistry.registerAlias("SOFT", SoftCache.class); typeAliasRegistry.registerAlias("WEAK", WeakCache.class); typeAliasRegistry.registerAlias("DB_VENDOR", VendorDatabaseIdProvider.class); typeAliasRegistry.registerAlias("XML", XMLLanguageDriver.class); typeAliasRegistry.registerAlias("RAW", RawLanguageDriver.class); typeAliasRegistry.registerAlias("SLF4J", Slf4jImpl.class); typeAliasRegistry.registerAlias("COMMONS_LOGGING", JakartaCommonsLoggingImpl.class); typeAliasRegistry.registerAlias("LOG4J", Log4jImpl.class); typeAliasRegistry.registerAlias("LOG4J2", Log4j2Impl.class); typeAliasRegistry.registerAlias("JDK_LOGGING", Jdk14LoggingImpl.class); typeAliasRegistry.registerAlias("STDOUT_LOGGING", StdOutImpl.class); typeAliasRegistry.registerAlias("NO_LOGGING", NoLoggingImpl.class); typeAliasRegistry.registerAlias("CGLIB", CglibProxyFactory.class); typeAliasRegistry.registerAlias("JAVASSIST", JavassistProxyFactory.class); languageRegistry.setDefaultDriverClass(XMLLanguageDriver.class); languageRegistry.register(RawLanguageDriver.class); } public String getLogPrefix() { return logPrefix; } public void setLogPrefix(String logPrefix) { this.logPrefix = logPrefix; } public Class<? extends Log> getLogImpl() { return logImpl; } @SuppressWarnings("unchecked") public void setLogImpl(Class<?> logImpl) { if (logImpl != null) { this.logImpl = (Class<? extends Log>) logImpl; LogFactory.useCustomLogging(this.logImpl); } } public boolean isCallSettersOnNulls() { return callSettersOnNulls; } public void setCallSettersOnNulls(boolean callSettersOnNulls) { this.callSettersOnNulls = callSettersOnNulls; } public String getDatabaseId() { return databaseId; } public void setDatabaseId(String databaseId) { this.databaseId = databaseId; } public Class<?> getConfigurationFactory() { return configurationFactory; } public void setConfigurationFactory(Class<?> configurationFactory) { this.configurationFactory = configurationFactory; } public boolean isSafeResultHandlerEnabled() { return safeResultHandlerEnabled; } public void setSafeResultHandlerEnabled(boolean safeResultHandlerEnabled) { this.safeResultHandlerEnabled = safeResultHandlerEnabled; } public boolean isSafeRowBoundsEnabled() { return safeRowBoundsEnabled; } public void setSafeRowBoundsEnabled(boolean safeRowBoundsEnabled) { this.safeRowBoundsEnabled = safeRowBoundsEnabled; } public boolean isMapUnderscoreToCamelCase() { return mapUnderscoreToCamelCase; } public void setMapUnderscoreToCamelCase(boolean mapUnderscoreToCamelCase) { this.mapUnderscoreToCamelCase = mapUnderscoreToCamelCase; } public void addLoadedResource(String resource) { loadedResources.add(resource); } public boolean isResourceLoaded(String resource) { return loadedResources.contains(resource); } public Environment getEnvironment() { return environment; } public void setEnvironment(Environment environment) { this.environment = environment; } public AutoMappingBehavior getAutoMappingBehavior() { return autoMappingBehavior; } public void setAutoMappingBehavior(AutoMappingBehavior autoMappingBehavior) { this.autoMappingBehavior = autoMappingBehavior; } public boolean isLazyLoadingEnabled() { return lazyLoadingEnabled; } public void setLazyLoadingEnabled(boolean lazyLoadingEnabled) { this.lazyLoadingEnabled = lazyLoadingEnabled; } public ProxyFactory getProxyFactory() { if (proxyFactory == null) { // makes sure CGLIB is not needed unless explicitly requested proxyFactory = new CglibProxyFactory(); } return proxyFactory; } public void setProxyFactory(ProxyFactory proxyFactory) { this.proxyFactory = proxyFactory; } public boolean isAggressiveLazyLoading() { return aggressiveLazyLoading; } public void setAggressiveLazyLoading(boolean aggressiveLazyLoading) { this.aggressiveLazyLoading = aggressiveLazyLoading; } public boolean isMultipleResultSetsEnabled() { return multipleResultSetsEnabled; } public void setMultipleResultSetsEnabled(boolean multipleResultSetsEnabled) { this.multipleResultSetsEnabled = multipleResultSetsEnabled; } public Set<String> getLazyLoadTriggerMethods() { return lazyLoadTriggerMethods; } public void setLazyLoadTriggerMethods(Set<String> lazyLoadTriggerMethods) { this.lazyLoadTriggerMethods = lazyLoadTriggerMethods; } public boolean isUseGeneratedKeys() { return useGeneratedKeys; } public void setUseGeneratedKeys(boolean useGeneratedKeys) { this.useGeneratedKeys = useGeneratedKeys; } public ExecutorType getDefaultExecutorType() { return defaultExecutorType; } public void setDefaultExecutorType(ExecutorType defaultExecutorType) { this.defaultExecutorType = defaultExecutorType; } public boolean isCacheEnabled() { return cacheEnabled; } public void setCacheEnabled(boolean cacheEnabled) { this.cacheEnabled = cacheEnabled; } public Integer getDefaultStatementTimeout() { return defaultStatementTimeout; } public void setDefaultStatementTimeout(Integer defaultStatementTimeout) { this.defaultStatementTimeout = defaultStatementTimeout; } public boolean isUseColumnLabel() { return useColumnLabel; } public void setUseColumnLabel(boolean useColumnLabel) { this.useColumnLabel = useColumnLabel; } public LocalCacheScope getLocalCacheScope() { return localCacheScope; } public void setLocalCacheScope(LocalCacheScope localCacheScope) { this.localCacheScope = localCacheScope; } public JdbcType getJdbcTypeForNull() { return jdbcTypeForNull; } public void setJdbcTypeForNull(JdbcType jdbcTypeForNull) { this.jdbcTypeForNull = jdbcTypeForNull; } public Properties getVariables() { return variables; } public void setVariables(Properties variables) { this.variables = variables; } public TypeHandlerRegistry getTypeHandlerRegistry() { return typeHandlerRegistry; } public TypeAliasRegistry getTypeAliasRegistry() { return typeAliasRegistry; } /** * @since 3.2.2 */ public MapperRegistry getMapperRegistry() { return mapperRegistry; } public ObjectFactory getObjectFactory() { return objectFactory; } public void setObjectFactory(ObjectFactory objectFactory) { this.objectFactory = objectFactory; } public ObjectWrapperFactory getObjectWrapperFactory() { return objectWrapperFactory; } public void setObjectWrapperFactory( ObjectWrapperFactory objectWrapperFactory) { this.objectWrapperFactory = objectWrapperFactory; } /** * @since 3.2.2 */ public List<Interceptor> getInterceptors() { return interceptorChain.getInterceptors(); } public LanguageDriverRegistry getLanguageRegistry() { return languageRegistry; } public void setDefaultScriptingLanguage(Class<?> driver) { if (driver == null) { driver = XMLLanguageDriver.class; } getLanguageRegistry().setDefaultDriverClass(driver); } public LanguageDriver getDefaultScriptingLanuageInstance() { return languageRegistry.getDefaultDriver(); } public MetaObject newMetaObject(Object object) { return MetaObject .forObject(object, objectFactory, objectWrapperFactory); } public ParameterHandler newParameterHandler( MappedStatement mappedStatement, Object parameterObject, BoundSql boundSql) { ParameterHandler parameterHandler = mappedStatement.getLang() .createParameterHandler(mappedStatement, parameterObject, boundSql); parameterHandler = (ParameterHandler) interceptorChain .pluginAll(parameterHandler); return parameterHandler; } public ResultSetHandler newResultSetHandler(Executor executor, MappedStatement mappedStatement, RowBounds rowBounds, ParameterHandler parameterHandler, ResultHandler resultHandler, BoundSql boundSql) { ResultSetHandler resultSetHandler = new DefaultResultSetHandler( executor, mappedStatement, parameterHandler, resultHandler, boundSql, rowBounds); resultSetHandler = (ResultSetHandler) interceptorChain .pluginAll(resultSetHandler); return resultSetHandler; } public StatementHandler newStatementHandler(Executor executor, MappedStatement mappedStatement, Object parameterObject, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) { StatementHandler statementHandler = new RoutingStatementHandler( executor, mappedStatement, parameterObject, rowBounds, resultHandler, boundSql); statementHandler = (StatementHandler) interceptorChain .pluginAll(statementHandler); return statementHandler; } public Executor newExecutor(Transaction transaction) { return newExecutor(transaction, defaultExecutorType); } public Executor newExecutor(Transaction transaction, ExecutorType executorType) { executorType = executorType == null ? defaultExecutorType : executorType; executorType = executorType == null ? ExecutorType.SIMPLE : executorType; Executor executor; if (ExecutorType.BATCH == executorType) { executor = new BatchExecutor(this, transaction); } else if (ExecutorType.REUSE == executorType) { executor = new ReuseExecutor(this, transaction); } else { executor = new SimpleExecutor(this, transaction); } if (cacheEnabled) { executor = new CachingExecutor(executor); } executor = (Executor) interceptorChain.pluginAll(executor); return executor; } public void addKeyGenerator(String id, KeyGenerator keyGenerator) { keyGenerators.put(id, keyGenerator); } public Collection<String> getKeyGeneratorNames() { return keyGenerators.keySet(); } public Collection<KeyGenerator> getKeyGenerators() { return keyGenerators.values(); } public KeyGenerator getKeyGenerator(String id) { return keyGenerators.get(id); } public boolean hasKeyGenerator(String id) { return keyGenerators.containsKey(id); } public void addCache(Cache cache) { caches.put(cache.getId(), cache); } public Collection<String> getCacheNames() { return caches.keySet(); } public Collection<Cache> getCaches() { return caches.values(); } public Cache getCache(String id) { return caches.get(id); } public boolean hasCache(String id) { return caches.containsKey(id); } public void addResultMap(ResultMap rm) { resultMaps.put(rm.getId(), rm); checkLocallyForDiscriminatedNestedResultMaps(rm); checkGloballyForDiscriminatedNestedResultMaps(rm); } public Collection<String> getResultMapNames() { return resultMaps.keySet(); } public Collection<ResultMap> getResultMaps() { return resultMaps.values(); } public ResultMap getResultMap(String id) { return resultMaps.get(id); } public boolean hasResultMap(String id) { return resultMaps.containsKey(id); } public void addParameterMap(ParameterMap pm) { parameterMaps.put(pm.getId(), pm); } public Collection<String> getParameterMapNames() { return parameterMaps.keySet(); } public Collection<ParameterMap> getParameterMaps() { return parameterMaps.values(); } public ParameterMap getParameterMap(String id) { return parameterMaps.get(id); } public boolean hasParameterMap(String id) { return parameterMaps.containsKey(id); } public void addMappedStatement(MappedStatement ms) { mappedStatements.put(ms.getId(), ms); } public Collection<String> getMappedStatementNames() { buildAllStatements(); return mappedStatements.keySet(); } public Collection<MappedStatement> getMappedStatements() { buildAllStatements(); return mappedStatements.values(); } public Collection<XMLStatementBuilder> getIncompleteStatements() { return incompleteStatements; } public void addIncompleteStatement(XMLStatementBuilder incompleteStatement) { incompleteStatements.add(incompleteStatement); } public Collection<CacheRefResolver> getIncompleteCacheRefs() { return incompleteCacheRefs; } public void addIncompleteCacheRef(CacheRefResolver incompleteCacheRef) { incompleteCacheRefs.add(incompleteCacheRef); } public Collection<ResultMapResolver> getIncompleteResultMaps() { return incompleteResultMaps; } public void addIncompleteResultMap(ResultMapResolver resultMapResolver) { incompleteResultMaps.add(resultMapResolver); } public void addIncompleteMethod(MethodResolver builder) { incompleteMethods.add(builder); } public Collection<MethodResolver> getIncompleteMethods() { return incompleteMethods; } public MappedStatement getMappedStatement(String id) { return this.getMappedStatement(id, true); } public MappedStatement getMappedStatement(String id, boolean validateIncompleteStatements) { if (validateIncompleteStatements) { buildAllStatements(); } return mappedStatements.get(id); } public Map<String, XNode> getSqlFragments() { return sqlFragments; } public void addInterceptor(Interceptor interceptor) { interceptorChain.addInterceptor(interceptor); } public void addMappers(String packageName, Class<?> superType) { mapperRegistry.addMappers(packageName, superType); } public void addMappers(String packageName) { mapperRegistry.addMappers(packageName); } public <T> void addMapper(Class<T> type) { mapperRegistry.addMapper(type); } public <T> T getMapper(Class<T> type, SqlSession sqlSession) { return mapperRegistry.getMapper(type, sqlSession); } public boolean hasMapper(Class<?> type) { return mapperRegistry.hasMapper(type); } public boolean hasStatement(String statementName) { return hasStatement(statementName, true); } public boolean hasStatement(String statementName, boolean validateIncompleteStatements) { if (validateIncompleteStatements) { buildAllStatements(); } return mappedStatements.containsKey(statementName); } public void addCacheRef(String namespace, String referencedNamespace) { cacheRefMap.put(namespace, referencedNamespace); } /* * Parses all the unprocessed statement nodes in the cache. It is * recommended to call this method once all the mappers are added as it * provides fail-fast statement validation. */ protected void buildAllStatements() { if (!incompleteResultMaps.isEmpty()) { synchronized (incompleteResultMaps) { // This always throws a BuilderException. incompleteResultMaps.iterator().next().resolve(); } } if (!incompleteCacheRefs.isEmpty()) { synchronized (incompleteCacheRefs) { // This always throws a BuilderException. incompleteCacheRefs.iterator().next().resolveCacheRef(); } } if (!incompleteStatements.isEmpty()) { synchronized (incompleteStatements) { // This always throws a BuilderException. incompleteStatements.iterator().next().parseStatementNode(); } } if (!incompleteMethods.isEmpty()) { synchronized (incompleteMethods) { // This always throws a BuilderException. incompleteMethods.iterator().next().resolve(); } } } /* * Extracts namespace from fully qualified statement id. * * @param statementId * * @return namespace or null when id does not contain period. */ protected String extractNamespace(String statementId) { int lastPeriod = statementId.lastIndexOf('.'); return lastPeriod > 0 ? statementId.substring(0, lastPeriod) : null; } // Slow but a one time cost. A better solution is welcome. protected void checkGloballyForDiscriminatedNestedResultMaps(ResultMap rm) { if (rm.hasNestedResultMaps()) { for (Map.Entry<String, ResultMap> entry : resultMaps.entrySet()) { Object value = entry.getValue(); if (value instanceof ResultMap) { ResultMap entryResultMap = (ResultMap) value; if (!entryResultMap.hasNestedResultMaps() && entryResultMap.getDiscriminator() != null) { Collection<String> discriminatedResultMapNames = entryResultMap .getDiscriminator().getDiscriminatorMap() .values(); if (discriminatedResultMapNames.contains(rm.getId())) { entryResultMap.forceNestedResultMaps(); } } } } } } // Slow but a one time cost. A better solution is welcome. protected void checkLocallyForDiscriminatedNestedResultMaps(ResultMap rm) { if (!rm.hasNestedResultMaps() && rm.getDiscriminator() != null) { for (Map.Entry<String, String> entry : rm.getDiscriminator() .getDiscriminatorMap().entrySet()) { String discriminatedResultMapName = entry.getValue(); if (hasResultMap(discriminatedResultMapName)) { ResultMap discriminatedResultMap = resultMaps .get(discriminatedResultMapName); if (discriminatedResultMap.hasNestedResultMaps()) { rm.forceNestedResultMaps(); break; } } } } } protected static class StrictMap<V> extends HashMap<String, V> { private static final long serialVersionUID = -4950446264854982944L; private String name; public StrictMap(String name, int initialCapacity, float loadFactor) { super(initialCapacity, loadFactor); this.name = name; } public StrictMap(String name, int initialCapacity) { super(initialCapacity); this.name = name; } public StrictMap(String name) { super(); this.name = name; } public StrictMap(String name, Map<String, ? extends V> m) { super(m); this.name = name; } /** * 如果现在状态为刷新，则刷新(先删除后添加) */ @SuppressWarnings("unchecked") public V put(String key, V value) { if (org.apache.ibatis.thread.RefreshRunnable.isRefresh()) { remove(key); org.apache.ibatis.thread.RefreshRunnable.log.debug("refresh key:" + key.substring(key.lastIndexOf(".") + 1)); } if (containsKey(key)) throw new IllegalArgumentException(name + " already contains value for " + key); if (key.contains(".")) { final String shortKey = getShortName(key); if (super.get(shortKey) == null) { super.put(shortKey, value); } else { super.put(shortKey, (V) new Ambiguity(shortKey)); } } return super.put(key, value); } public V get(Object key) { V value = super.get(key); if (value == null) { throw new IllegalArgumentException(name + " does not contain value for " + key); } if (value instanceof Ambiguity) { throw new IllegalArgumentException( ((Ambiguity) value).getSubject() + " is ambiguous in " + name + " (try using the full name including the namespace, or rename one of the entries)"); } return value; } private String getShortName(String key) { final String[] keyparts = key.split("\."); final String shortKey = keyparts[keyparts.length - 1]; return shortKey; } protected static class Ambiguity { private String subject; public Ambiguity(String subject) { this.subject = subject; } public String getSubject() { return subject; } } } }
/* * Copyright 2009-2013 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.ibatis.builder.xml; import java.io.InputStream; import java.io.Reader; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Properties; import org.apache.ibatis.builder.BaseBuilder; import org.apache.ibatis.builder.BuilderException; import org.apache.ibatis.builder.CacheRefResolver; import org.apache.ibatis.builder.IncompleteElementException; import org.apache.ibatis.builder.MapperBuilderAssistant; import org.apache.ibatis.builder.ResultMapResolver; import org.apache.ibatis.cache.Cache; import org.apache.ibatis.executor.ErrorContext; import org.apache.ibatis.io.Resources; import org.apache.ibatis.mapping.Discriminator; import org.apache.ibatis.mapping.ParameterMapping; import org.apache.ibatis.mapping.ParameterMode; import org.apache.ibatis.mapping.ResultFlag; import org.apache.ibatis.mapping.ResultMap; import org.apache.ibatis.mapping.ResultMapping; import org.apache.ibatis.parsing.XNode; import org.apache.ibatis.parsing.XPathParser; import org.apache.ibatis.session.Configuration; import org.apache.ibatis.type.JdbcType; import org.apache.ibatis.type.TypeHandler; /** * @author Clinton Begin * @description 增加解析方法，原方法不解析相同的resource */ public class XMLMapperBuilder extends BaseBuilder { private XPathParser parser; private MapperBuilderAssistant builderAssistant; private Map<String, XNode> sqlFragments; private String resource; @Deprecated public XMLMapperBuilder(Reader reader, Configuration configuration, String resource, Map<String, XNode> sqlFragments, String namespace) { this(reader, configuration, resource, sqlFragments); this.builderAssistant.setCurrentNamespace(namespace); } @Deprecated public XMLMapperBuilder(Reader reader, Configuration configuration, String resource, Map<String, XNode> sqlFragments) { this(new XPathParser(reader, true, configuration.getVariables(), new XMLMapperEntityResolver()), configuration, resource, sqlFragments); } public XMLMapperBuilder(InputStream inputStream, Configuration configuration, String resource, Map<String, XNode> sqlFragments, String namespace) { this(inputStream, configuration, resource, sqlFragments); this.builderAssistant.setCurrentNamespace(namespace); } public XMLMapperBuilder(InputStream inputStream, Configuration configuration, String resource, Map<String, XNode> sqlFragments) { this(new XPathParser(inputStream, true, configuration.getVariables(), new XMLMapperEntityResolver()), configuration, resource, sqlFragments); } private XMLMapperBuilder(XPathParser parser, Configuration configuration, String resource, Map<String, XNode> sqlFragments) { super(configuration); this.builderAssistant = new MapperBuilderAssistant(configuration, resource); this.parser = parser; this.sqlFragments = sqlFragments; this.resource = resource; } public void parse() { if (!configuration.isResourceLoaded(resource)) { configurationElement(parser.evalNode("/mapper")); configuration.addLoadedResource(resource); bindMapperForNamespace(); } parsePendingResultMaps(); parsePendingChacheRefs(); parsePendingStatements(); } public void parse1() { // if (!configuration.isResourceLoaded(resource)) { configurationElement(parser.evalNode("/mapper")); configuration.addLoadedResource(resource); bindMapperForNamespace(); // } parsePendingResultMaps(); parsePendingChacheRefs(); parsePendingStatements(); } public XNode getSqlFragment(String refid) { return sqlFragments.get(refid); } private void configurationElement(XNode context) { try { String namespace = context.getStringAttribute("namespace"); if (namespace.equals("")) { throw new BuilderException("Mapper's namespace cannot be empty"); } builderAssistant.setCurrentNamespace(namespace); cacheRefElement(context.evalNode("cache-ref")); cacheElement(context.evalNode("cache")); parameterMapElement(context.evalNodes("/mapper/parameterMap")); resultMapElements(context.evalNodes("/mapper/resultMap")); sqlElement(context.evalNodes("/mapper/sql")); buildStatementFromContext(context .evalNodes("select|insert|update|delete")); } catch (Exception e) { throw new BuilderException("Error parsing Mapper XML. Cause: " + e, e); } } private void buildStatementFromContext(List<XNode> list) { if (configuration.getDatabaseId() != null) { buildStatementFromContext(list, configuration.getDatabaseId()); } buildStatementFromContext(list, null); } private void buildStatementFromContext(List<XNode> list, String requiredDatabaseId) { for (XNode context : list) { final XMLStatementBuilder statementParser = new XMLStatementBuilder( configuration, builderAssistant, context, requiredDatabaseId); try { statementParser.parseStatementNode(); } catch (IncompleteElementException e) { configuration.addIncompleteStatement(statementParser); } } } private void parsePendingResultMaps() { Collection<ResultMapResolver> incompleteResultMaps = configuration .getIncompleteResultMaps(); synchronized (incompleteResultMaps) { Iterator<ResultMapResolver> iter = incompleteResultMaps.iterator(); while (iter.hasNext()) { try { iter.next().resolve(); iter.remove(); } catch (IncompleteElementException e) { // ResultMap is still missing a resource... } } } } private void parsePendingChacheRefs() { Collection<CacheRefResolver> incompleteCacheRefs = configuration .getIncompleteCacheRefs(); synchronized (incompleteCacheRefs) { Iterator<CacheRefResolver> iter = incompleteCacheRefs.iterator(); while (iter.hasNext()) { try { iter.next().resolveCacheRef(); iter.remove(); } catch (IncompleteElementException e) { // Cache ref is still missing a resource... } } } } private void parsePendingStatements() { Collection<XMLStatementBuilder> incompleteStatements = configuration .getIncompleteStatements(); synchronized (incompleteStatements) { Iterator<XMLStatementBuilder> iter = incompleteStatements .iterator(); while (iter.hasNext()) { try { iter.next().parseStatementNode(); iter.remove(); } catch (IncompleteElementException e) { // Statement is still missing a resource... } } } } private void cacheRefElement(XNode context) { if (context != null) { configuration.addCacheRef(builderAssistant.getCurrentNamespace(), context.getStringAttribute("namespace")); CacheRefResolver cacheRefResolver = new CacheRefResolver( builderAssistant, context.getStringAttribute("namespace")); try { cacheRefResolver.resolveCacheRef(); } catch (IncompleteElementException e) { configuration.addIncompleteCacheRef(cacheRefResolver); } } } private void cacheElement(XNode context) throws Exception { if (context != null) { String type = context.getStringAttribute("type", "PERPETUAL"); Class<? extends Cache> typeClass = typeAliasRegistry .resolveAlias(type); String eviction = context.getStringAttribute("eviction", "LRU"); Class<? extends Cache> evictionClass = typeAliasRegistry .resolveAlias(eviction); Long flushInterval = context.getLongAttribute("flushInterval"); Integer size = context.getIntAttribute("size"); boolean readWrite = !context.getBooleanAttribute("readOnly", false); Properties props = context.getChildrenAsProperties(); builderAssistant.useNewCache(typeClass, evictionClass, flushInterval, size, readWrite, props); } } private void parameterMapElement(List<XNode> list) throws Exception { for (XNode parameterMapNode : list) { String id = parameterMapNode.getStringAttribute("id"); String type = parameterMapNode.getStringAttribute("type"); Class<?> parameterClass = resolveClass(type); List<XNode> parameterNodes = parameterMapNode .evalNodes("parameter"); List<ParameterMapping> parameterMappings = new ArrayList<ParameterMapping>(); for (XNode parameterNode : parameterNodes) { String property = parameterNode.getStringAttribute("property"); String javaType = parameterNode.getStringAttribute("javaType"); String jdbcType = parameterNode.getStringAttribute("jdbcType"); String resultMap = parameterNode .getStringAttribute("resultMap"); String mode = parameterNode.getStringAttribute("mode"); String typeHandler = parameterNode .getStringAttribute("typeHandler"); Integer numericScale = parameterNode .getIntAttribute("numericScale"); ParameterMode modeEnum = resolveParameterMode(mode); Class<?> javaTypeClass = resolveClass(javaType); JdbcType jdbcTypeEnum = resolveJdbcType(jdbcType); @SuppressWarnings("unchecked") Class<? extends TypeHandler<?>> typeHandlerClass = (Class<? extends TypeHandler<?>>) resolveClass(typeHandler); ParameterMapping parameterMapping = builderAssistant .buildParameterMapping(parameterClass, property, javaTypeClass, jdbcTypeEnum, resultMap, modeEnum, typeHandlerClass, numericScale); parameterMappings.add(parameterMapping); } builderAssistant.addParameterMap(id, parameterClass, parameterMappings); } } private void resultMapElements(List<XNode> list) throws Exception { for (XNode resultMapNode : list) { try { resultMapElement(resultMapNode); } catch (IncompleteElementException e) { // ignore, it will be retried } } } private ResultMap resultMapElement(XNode resultMapNode) throws Exception { return resultMapElement(resultMapNode, Collections.<ResultMapping> emptyList()); } private ResultMap resultMapElement(XNode resultMapNode, List<ResultMapping> additionalResultMappings) throws Exception { ErrorContext.instance().activity( "processing " + resultMapNode.getValueBasedIdentifier()); String id = resultMapNode.getStringAttribute("id", resultMapNode.getValueBasedIdentifier()); String type = resultMapNode.getStringAttribute("type", resultMapNode .getStringAttribute("ofType", resultMapNode.getStringAttribute( "resultType", resultMapNode.getStringAttribute("javaType")))); String extend = resultMapNode.getStringAttribute("extends"); Boolean autoMapping = resultMapNode.getBooleanAttribute("autoMapping"); Class<?> typeClass = resolveClass(type); Discriminator discriminator = null; List<ResultMapping> resultMappings = new ArrayList<ResultMapping>(); resultMappings.addAll(additionalResultMappings); List<XNode> resultChildren = resultMapNode.getChildren(); for (XNode resultChild : resultChildren) { if ("constructor".equals(resultChild.getName())) { processConstructorElement(resultChild, typeClass, resultMappings); } else if ("discriminator".equals(resultChild.getName())) { discriminator = processDiscriminatorElement(resultChild, typeClass, resultMappings); } else { ArrayList<ResultFlag> flags = new ArrayList<ResultFlag>(); if ("id".equals(resultChild.getName())) { flags.add(ResultFlag.ID); } resultMappings.add(buildResultMappingFromContext(resultChild, typeClass, flags)); } } ResultMapResolver resultMapResolver = new ResultMapResolver( builderAssistant, id, typeClass, extend, discriminator, resultMappings, autoMapping); try { return resultMapResolver.resolve(); } catch (IncompleteElementException e) { configuration.addIncompleteResultMap(resultMapResolver); throw e; } } private void processConstructorElement(XNode resultChild, Class<?> resultType, List<ResultMapping> resultMappings) throws Exception { List<XNode> argChildren = resultChild.getChildren(); for (XNode argChild : argChildren) { ArrayList<ResultFlag> flags = new ArrayList<ResultFlag>(); flags.add(ResultFlag.CONSTRUCTOR); if ("idArg".equals(argChild.getName())) { flags.add(ResultFlag.ID); } resultMappings.add(buildResultMappingFromContext(argChild, resultType, flags)); } } private Discriminator processDiscriminatorElement(XNode context, Class<?> resultType, List<ResultMapping> resultMappings) throws Exception { String column = context.getStringAttribute("column"); String javaType = context.getStringAttribute("javaType"); String jdbcType = context.getStringAttribute("jdbcType"); String typeHandler = context.getStringAttribute("typeHandler"); Class<?> javaTypeClass = resolveClass(javaType); @SuppressWarnings("unchecked") Class<? extends TypeHandler<?>> typeHandlerClass = (Class<? extends TypeHandler<?>>) resolveClass(typeHandler); JdbcType jdbcTypeEnum = resolveJdbcType(jdbcType); Map<String, String> discriminatorMap = new HashMap<String, String>(); for (XNode caseChild : context.getChildren()) { String value = caseChild.getStringAttribute("value"); String resultMap = caseChild.getStringAttribute("resultMap", processNestedResultMappings(caseChild, resultMappings)); discriminatorMap.put(value, resultMap); } return builderAssistant .buildDiscriminator(resultType, column, javaTypeClass, jdbcTypeEnum, typeHandlerClass, discriminatorMap); } private void sqlElement(List<XNode> list) throws Exception { if (configuration.getDatabaseId() != null) { sqlElement(list, configuration.getDatabaseId()); } sqlElement(list, null); } private void sqlElement(List<XNode> list, String requiredDatabaseId) throws Exception { for (XNode context : list) { String databaseId = context.getStringAttribute("databaseId"); String id = context.getStringAttribute("id"); id = builderAssistant.applyCurrentNamespace(id, false); if (databaseIdMatchesCurrent(id, databaseId, requiredDatabaseId)) sqlFragments.put(id, context); } } private boolean databaseIdMatchesCurrent(String id, String databaseId, String requiredDatabaseId) { if (requiredDatabaseId != null) { if (!requiredDatabaseId.equals(databaseId)) { return false; } } else { if (databaseId != null) { return false; } // skip this fragment if there is a previous one with a not null // databaseId if (this.sqlFragments.containsKey(id)) { XNode context = this.sqlFragments.get(id); if (context.getStringAttribute("databaseId") != null) { return false; } } } return true; } private ResultMapping buildResultMappingFromContext(XNode context, Class<?> resultType, ArrayList<ResultFlag> flags) throws Exception { String property = context.getStringAttribute("property"); String column = context.getStringAttribute("column"); String javaType = context.getStringAttribute("javaType"); String jdbcType = context.getStringAttribute("jdbcType"); String nestedSelect = context.getStringAttribute("select"); String nestedResultMap = context.getStringAttribute( "resultMap", processNestedResultMappings(context, Collections.<ResultMapping> emptyList())); String notNullColumn = context.getStringAttribute("notNullColumn"); String columnPrefix = context.getStringAttribute("columnPrefix"); String typeHandler = context.getStringAttribute("typeHandler"); String resulSet = context.getStringAttribute("resultSet"); String foreignColumn = context.getStringAttribute("foreignColumn"); boolean lazy = "lazy".equals(context.getStringAttribute("fetchType", configuration.isLazyLoadingEnabled() ? "lazy" : "eager")); Class<?> javaTypeClass = resolveClass(javaType); @SuppressWarnings("unchecked") Class<? extends TypeHandler<?>> typeHandlerClass = (Class<? extends TypeHandler<?>>) resolveClass(typeHandler); JdbcType jdbcTypeEnum = resolveJdbcType(jdbcType); return builderAssistant.buildResultMapping(resultType, property, column, javaTypeClass, jdbcTypeEnum, nestedSelect, nestedResultMap, notNullColumn, columnPrefix, typeHandlerClass, flags, resulSet, foreignColumn, lazy); } private String processNestedResultMappings(XNode context, List<ResultMapping> resultMappings) throws Exception { if ("association".equals(context.getName()) || "collection".equals(context.getName()) || "case".equals(context.getName())) { if (context.getStringAttribute("select") == null) { ResultMap resultMap = resultMapElement(context, resultMappings); return resultMap.getId(); } } return null; } private void bindMapperForNamespace() { String namespace = builderAssistant.getCurrentNamespace(); if (namespace != null) { Class<?> boundType = null; try { boundType = Resources.classForName(namespace); } catch (ClassNotFoundException e) { // ignore, bound type is not required } if (boundType != null) { if (!configuration.hasMapper(boundType)) { // Spring may not know the real resource name so we set a // flag // to prevent loading again this resource from the mapper // interface // look at MapperAnnotationBuilder#loadXmlResource configuration.addLoadedResource("namespace:" + namespace); configuration.addMapper(boundType); } } } } }
增加刷新xml的线程（核心配置）：
package org.apache.ibatis.thread; import com.google.common.util.concurrent.ThreadFactoryBuilder; import org.apache.ibatis.session.Configuration; import org.apache.log4j.Logger; import org.mybatis.spring.SqlSessionFactoryBean; import org.springframework.core.NestedIOException; import org.springframework.core.io.FileSystemResource; import org.springframework.core.io.Resource; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.lang.reflect.Field; import java.util.ArrayList; import java.util.List; import java.util.Set; import java.util.concurrent.ScheduledThreadPoolExecutor; import java.util.concurrent.ThreadFactory; import java.util.concurrent.TimeUnit; /** * 刷新使用进程 * * @author gongtao * @date 2019-04-09 */ public class RefreshRunnable implements java.lang.Runnable { public static Logger log = Logger.getLogger(RefreshRunnable.class); private Resource[] mapperLocations; private Configuration configuration; /** * 上一次刷新时间 */ private Long beforeTime = 0L; /** * 是否执行刷新 */ private static boolean refresh = false; /** * 延迟刷新秒数 */ private static int delaySeconds; /** * 休眠时间 */ private static int sleepSeconds; /** * 是否启用 */ private static boolean enabled; /** * 是否关闭 */ private static boolean closed = false; /** 线程工厂 */ private static final ThreadFactory THREAD_FACTORY = new ThreadFactoryBuilder().setNameFormat("mybatis-xml-reload-%d").build(); /** 定时扫描线程池 */ private static final ScheduledThreadPoolExecutor EXECUTOR = new ScheduledThreadPoolExecutor(1, THREAD_FACTORY); static { delaySeconds = PropertiesUtil.getInt("delaySeconds"); sleepSeconds = PropertiesUtil.getInt("sleepSeconds"); enabled = "true".equals(PropertiesUtil.getString("enabled")); delaySeconds = delaySeconds == 0 ? 50 : delaySeconds; sleepSeconds = sleepSeconds == 0 ? 1 : sleepSeconds; log.debug("[delaySeconds] " + delaySeconds); log.debug("[sleepSeconds] " + sleepSeconds); } public static boolean isRefresh() { return refresh; } public RefreshRunnable(Resource[] mapperLocations, Configuration configuration) { this.mapperLocations = mapperLocations; this.configuration = configuration; } @Override public void run() { beforeTime = System.currentTimeMillis(); if (enabled) { start(this); } } public void start(final RefreshRunnable runnable) { refresh = true; System.out.println("Enable refresh mybatis xml thread..."); EXECUTOR.scheduleAtFixedRate(() -> { try { runnable.refresh(mapperLocations, beforeTime); } catch (Exception e) { e.printStackTrace(); } }, delaySeconds, sleepSeconds, TimeUnit.SECONDS); } /** * 关闭热加载线程 */ public static void closeReloadThread(){ log.info("Shutting down mybatis-xml-reload scheduled job"); if (enabled && refresh && !closed){ EXECUTOR.shutdown(); closed = true; } } /** * 执行刷新 * * @param mapperLocations 刷新目录 * @param beforeTime 上次刷新时间 * @throws NestedIOException 解析异常 * @throws FileNotFoundException 文件未找到 */ public void refresh(Resource[] mapperLocations, Long beforeTime) throws Exception { // 本次刷新时间 Long refreshTime = System.currentTimeMillis(); List<File> refreshList = this.getRefreshFile(mapperLocations, beforeTime); if (refreshList.size() > 0) { log.debug("refresh files:" + refreshList.size()); } for (File file : refreshList) { System.out.println("Refresh file: " + file.getAbsolutePath()); log.debug("refresh file:" + file.getAbsolutePath()); log.debug("refresh filename:" + file.getName()); // 清理已加载的资源标识，方便让它重新加载。 Field loadedResourcesField = configuration.getClass().getDeclaredField("loadedResources"); loadedResourcesField.setAccessible(true); Set loadedResourcesSet = ((Set) loadedResourcesField.get(configuration)); loadedResourcesSet.remove(file.getAbsolutePath()); SqlSessionFactoryBean.refresh(new FileInputStream(file), file.getAbsolutePath(), configuration); } // 如果刷新了文件，则修改刷新时间，否则不修改 if (refreshList.size() > 0) { this.beforeTime = refreshTime; } } /** * 获取需要刷新的文件列表 * * @param mapperLocations 目录 * @param beforeTime 上次刷新时间 * @return 刷新文件列表 */ private List<File> getRefreshFile(Resource[] mapperLocations, Long beforeTime) { List<File> refreshList = new ArrayList<>(); for (Resource mapperLocation : mapperLocations) { try { if (mapperLocation instanceof FileSystemResource) { File file = mapperLocation.getFile(); if (this.check(file, beforeTime)) { refreshList.add(file); } } } catch (IOException e) { log.error("get file error", e); } } return refreshList; } /** * 判断文件是否需要刷新 * * @param file 文件 * @param beforeTime 上次刷新时间 * @return 需要刷新返回true，否则返回false */ public boolean check(File file, Long beforeTime) { return file.lastModified() > beforeTime; } }
增加刷新xml的配置文件及工具类：
package org.apache.ibatis.thread; import java.util.Objects; import java.util.Properties; public class PropertiesUtil { private static String filename = "/mybatis-refresh.properties"; private static Properties pro = new Properties(); static { try { pro.load(PropertiesUtil.class.getResourceAsStream(filename)); } catch (Exception e) { e.printStackTrace(); System.out.println("Load mybatis-refresh “"+filename+"” file error."); } } public static int getInt(String key) { int i = 0; try { i = Integer.parseInt(Objects.requireNonNull(getString(key))); } catch (Exception e) { //ignore } return i; } public static String getString(String key) { return pro == null ? null : pro.getProperty(key); } }
配置文件mybatis-refresh.xml：
# enabled enabled=true # project start time[项目启动时间] delaySeconds=5 # xml scanning interval time[扫描间隔时长] sleepSeconds=2
这样就OK了，但是还有个问题，就是在关闭spring容器时，由于刷新线程一直存在，导致不能完全优雅关闭容器，故增加关闭刷新线程操作：
package com.xx.common.listener; import org.apache.ibatis.thread.RefreshRunnable; import org.springframework.context.ApplicationListener; import org.springframework.context.event.ContextClosedEvent; import org.springframework.stereotype.Component; /** * spring 关闭时监听器 * @author gongtao * @date 2019-04-11 9:37 **/ @Component public class ContainerClosedListener implements ApplicationListener<ContextClosedEvent> { @Override public void onApplicationEvent(ContextClosedEvent contextClosedEvent) { //关闭mybatis 热加载线程 RefreshRunnable.closeReloadThread(); } }
如此，大功告成！