Liferay7 BPM门户开发之12:acitiviti和liferay用户权限体系集成

写到第12章才出现Liferay的内容，希望可以厚积薄发。

我们的目标是不使用不维护Activiti的用户组织架构，只维护Liferay的体系，这样的好处是非常明显的，即不用做组织架构的同步工作。

原理是继承实现org.activiti.engine.impl.interceptor.SessionFactory

首先继承用户实例，用liferay的用户模型

import org.activiti.engine.impl.persistence.entity.UserEntity;

public class UserImpl extends UserEntity {
    private static final long serialVersionUID = -5809624687782521587L;
    
    public UserImpl(com.liferay.portal.model.User liferayUser) {
        id = String.valueOf(liferayUser.getUserId());
        firstName = liferayUser.getFirstName();
        lastName = liferayUser.getLastName();
        email = liferayUser.getEmailAddress();
    }
}

实现管理类UserEntityManager

import java.util.List;
import org.activiti.engine.identity.Group;
import org.activiti.engine.identity.User;
import org.activiti.engine.identity.UserQuery;
import org.activiti.engine.impl.Page;
import org.activiti.engine.impl.UserQueryImpl;
import org.activiti.engine.impl.persistence.entity.IdentityInfoEntity;
import org.activiti.engine.impl.persistence.entity.UserEntity;
import org.activiti.engine.impl.persistence.entity.UserEntityManager;
import org.springframework.stereotype.Service;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;

@Service("liferayUserManagerSession")
public class LiferayUserManagerSession extends UserEntityManager {
    
    private static Log _log = LogFactoryUtil.getLog(LiferayUserManagerSession.class);

    private LiferayIdentityService liferayIdentityService = new LiferayIdentityService();
    
    @Override
    public User createNewUser(String userId) {
        _log.error("Method is not implemented"); // TODO
        return null;
    }

    @Override
    public void insertUser(User user) {
        _log.error("Method is not implemented"); // TODO
    }

    @Override
    public void updateUser(UserEntity updatedUser) {
        _log.error("Method is not implemented"); // TODO
    }
    
    @Override
    public UserEntity findUserById(String userId) {
        return liferayIdentityService.findUserById(userId);
    }
    
    @Override
    public void deleteUser(String userId) {
        _log.error("Method is not implemented"); // TODO
    }

    @Override
    public List<User> findUserByQueryCriteria(UserQueryImpl query, Page page) {
        _log.error("Method is not implemented"); // TODO
        return null;
    }

    @Override
    public long findUserCountByQueryCriteria(UserQueryImpl query) {
        _log.error("Method is not implemented"); // TODO
        return -1;
    }

    @Override
    public List<Group> findGroupsByUser(String userId) {
        return liferayIdentityService.findGroupsByUser(userId);
    }

    @Override
    public UserQuery createNewUserQuery() {
        _log.error("Method is not implemented"); // TODO
        return null;
    }

    @Override
    public IdentityInfoEntity findUserInfoByUserIdAndKey(String userId,
            String key) {
        _log.error("Method is not implemented"); // TODO
        return null;
    }

    @Override
    public List<String> findUserInfoKeysByUserIdAndType(String userId,
            String type) {
        _log.error("Method is not implemented"); // TODO
        return null;
    }

}

其中，最关键的方法是查找人员，重载为：

@Override
    public UserEntity findUserById(String userId) {
        return liferayIdentityService.findUserById(userId);
    }

实现工厂类

import org.activiti.engine.impl.interceptor.Session;
import org.activiti.engine.impl.interceptor.SessionFactory;

public class LiferayUserManagerSessionFactory implements SessionFactory {

    @Override
    public Session openSession() {
        return new LiferayUserManagerSession();
    }

    @Override
    public Class<?> getSessionType() {
        return LiferayUserManagerSession.class;
    }

}

实用服务查询类：

import org.activiti.engine.identity.Group;
import org.activiti.engine.identity.User;
import org.activiti.engine.impl.persistence.entity.UserEntity;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.model.Role;
import com.liferay.portal.model.UserGroupRole;
import com.liferay.portal.service.RoleLocalServiceUtil;
import com.liferay.portal.service.UserGroupRoleLocalServiceUtil;
import com.liferay.portal.service.UserLocalServiceUtil;

@Service("liferayIdentityService")
public class LiferayIdentityService {
    private static Log _log = LogFactoryUtil.getLog(LiferayIdentityService.class);

    @Autowired
    IdMappingService idMappingService;

    // Groups
    
    public List<Group> findGroupsByUser(String userName) {
        try {
            // get regular roles
            List<Role> roles = RoleLocalServiceUtil.getUserRoles(idMappingService.getUserId(userName));

            // conert from site roles to the groups
            List<Group> groups = new ArrayList<Group>();
            for (Role role : roles) {
                GroupImpl groupImpl = new GroupImpl(role);
                groups.add(groupImpl);
            }
            
            // get group roles for specified user
            List<UserGroupRole> groupRoles = UserGroupRoleLocalServiceUtil.getUserGroupRoles(idMappingService.getUserId(userName));
            for (UserGroupRole groupRole : groupRoles) {
                GroupImpl groupImpl = new GroupImpl(groupRole);
                groups.add(groupImpl);
            }
            
            return groups;
        } catch (Exception e) {
            _log.error("Cannot get list of roles for user: " + userName, e);
            return new ArrayList<Group>();
        }
    }

    public List<User> findUsersByGroup(long companyId, String groupName) {
        return WorkflowUtil.findUsersByGroup(companyId, groupName);
    }
    
    public Role findRole(long companyId, String groupName) {
        // first - try to parse group to identify - it is regular group or org/community group
        String[] parsedName = groupName.split("/");
        List<com.liferay.portal.model.User> users = null;
        List<User> result = new ArrayList<User>();
        
        try {
            if (parsedName.length == 1) {
                // regilar group
                Role role = RoleLocalServiceUtil.getRole(companyId, groupName);
                
                return role;
            } else {
                long groupId = Long.valueOf(parsedName[0]);
                groupName = parsedName[1];
                
                if (parsedName.length > 2) {
                    groupName = StringUtils.join(ArrayUtils.subarray(parsedName, 1, parsedName.length), "/");
                }
                
                Role role = RoleLocalServiceUtil.getRole(companyId, groupName);
                
                return role;
            }
        } catch (Exception ex) {
            _log.warn("Cannot get group users", ex);
            return null;
        }
    }

    // Users
    
    public UserEntity findUserById(String userName) {
        try {
            com.liferay.portal.model.User liferayUser = UserLocalServiceUtil.getUser(idMappingService.getUserId(userName));
            return new UserImpl(liferayUser);
        } catch (Exception ex) {
            _log.error("Cannot find user " + userName + " : " + ex.getMessage());
            return null;
        }
    }

}

非常优雅，不侵入，不破坏，依赖分离，松耦合.

但我感觉这种注入接口还是Openfire的源代码接口（各种供应者interface接口）实现的更加直观和优雅。

接下来是BPM门户开发攻坚关键，一步一步跟着我走，必定会逐渐脉络清晰。