Kylin Java RESTful API

转自  https://www.cnblogs.com/dreamfactory/p/5588203.html

最近在做大数据方面的开发, 学习研究了一段时间的kylin系统, 对于前端开发需要使用 RESTful API ,但是官网并没有提供详细的Java  API. 经过几天的看文档,最终写出了 Java 的API,不敢私藏,特分享与大家.

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.commons.codec.binary.Base64;  



/**
 * 
 * @author HennSun  
 * www.shareideas.net
 * @Reference
 * http://kylin.apache.org/docs15/howto/howto_use_restapi.html#authentication
 *
 */
public class KylinHttpBasic {
    
    private static String encoding;
    private static final String baseURL = "http://10.1.50.123:7070/kylin/api";
    public static String login(String user,String passwd){
        String method = "POST";
        String para = "/user/authentication";
        byte[] key = (user+":"+passwd).getBytes();
        encoding = new sun.misc.BASE64Encoder().encode(key);
        return  excute(para,method,null);
    }

    
    public static String listQueryableTables(String projectName){
         
        String method = "GET";
        String para = "/tables_and_columns?project="+projectName;
        
        return  excute(para,method,null);
        
    }
    
    
    /**
     * 
     * @param offset required int Offset used by pagination
     * @param limit required int Cubes per page.
     * @param cubeName optional string Keyword for cube names. To find cubes whose name contains this keyword.
     * @param projectName optional string Project name.
     * @return
     */
    public static String listCubes(int offset,
                                   int limit,
                                   String cubeName,
                                   String projectName ){
        String method = "GET";
        String para = "/cubes?offset="+offset
                            +"&limit="+limit
                            +"&cubeName="+cubeName
                            +"&projectName="+projectName;
        return excute(para,method,null); 
    }
    
    /**
     * 
     * @param cubeName  Cube name.
     * @return
     */
    public static String getCubeDes(String cubeName){
        String method = "GET";
        String para = "/cube_desc/"+cubeName;
        return excute(para,method,null); 
        
    }
    
    
    /**
     * 
     * @param cubeName
     * @return
     */
    public static String getCube(String cubeName){
        String method = "GET";
        String para = "/cubes/"+cubeName;
        return excute(para,method,null); 
        
    }
    
    
    
    /**
     * 
     * @param modelName Data model name, by default it should be the same with cube name.
     * @return
     */
    public static String getDataModel(String modelName){
        String method = "GET";
        String para = "/model/"+modelName;
        return excute(para,method,null);  
        
    }

    /**
     *  
     * @param cubeName cubeName Cube name.
     * @return
     */
    public static String enableCube(String cubeName){
        
        String method = "PUT";
        String para = "/cubes/"+cubeName+"/enable";
        return excute(para,method,null); 
        
    }
    
    /**
     * 
     * @param cubeName Cube name.
     * @return
     */
    public static String disableCube(String cubeName){
        
        String method = "PUT";
        String para = "/cubes/"+cubeName+"/disable";
        return excute(para,method,null); 
        
    }
    
    /**
     *  
     * @param cubeName Cube name.
     * @return
     */
    public static String purgeCube(String cubeName){

        String method = "PUT";
        String para = "/cubes/"+cubeName+"/purge";
        return excute(para,method,null); 
        
    }
    
    
    /**
     *  
     * @param jobId Job id
     * @return
     */
    public static String resumeJob(String jobId){

        String method = "PUT";
        String para = "/jobs/"+jobId+"/resume";
        return excute(para,method,null); 
        
    }
    
    
    /**
     * startTime - required long Start timestamp of data to build, e.g. 1388563200000 for 2014-1-1
     * endTime - required long End timestamp of data to build
     * buildType - required string Supported build type: ‘BUILD’, ‘MERGE’, ‘REFRESH’
     * @param cubeName  Cube name.
     * @return
     */
    public static String buildCube(String cubeName,String body){
        String method = "PUT";
        String para = "/cubes/"+cubeName+"/rebuild";
        
        return excute(para,method,body); 
    }
    
    
    /**
     * 
     * @param jobId  Job id.
     * @return
     */
    public static String discardJob(String jobId){

        String method = "PUT";
        String para = "/jobs/"+jobId+"/cancel";
        return excute(para,method,null); 
        
    }
    
    /**
     * 
     * @param jobId  Job id.
     * @return
     */
    public static String getJobStatus(String jobId){

        String method = "GET";
        String para = "/jobs/"+jobId;
        return excute(para,method,null); 
        
    }
    
    /**
     * 
     * @param jobId Job id.
     * @param stepId  Step id; the step id is composed by jobId with step sequence id; 
     * for example, the jobId is “fb479e54-837f-49a2-b457-651fc50be110”, its 3rd step id 
     * is “fb479e54-837f-49a2-b457-651fc50be110-3”,
     * @return
     */
    public static String getJobStepOutput(String jobId,String stepId){
        String method = "GET";
        String para = "/"+jobId+"/steps/"+stepId+"/output";
        return excute(para,method,null); 
    }
    
    /**
     * 
     * @param tableName table name to find.
     * @return
     */
    public static String getHiveTable(String tableName){
        String method = "GET";
        String para = "/tables/"+tableName;
        return excute(para,method,null); 
    }
    
    /**
     * 
     * @param tableName  table name to find.
     * @return
     */
    public static String getHiveTableInfo(String tableName){
        String method = "GET";
        String para = "/tables/"+tableName+"/exd-map";
        return excute(para,method,null); 
    }
    

    /**
     * 
     * @param projectName will list all tables in the project.
     * @param extOptional boolean set true to get extend info of table.
     * @return
     */
    public static String getHiveTables(String projectName,boolean extOptional){
        String method = "GET";
        String para = "/tables?project="+projectName+"&ext="+extOptional;
        return excute(para,method,null); 
    }
    
    
    /**
     * 
     * @param tables  table names you want to load from hive, separated with comma.
     * @param project the project which the tables will be loaded into.
     * @return
     */
    public static String loadHiveTables(String tables,String project){
        String method = "POST";
        String para = "/tables/"+tables+"/"+project;
        return excute(para,method,null); 
    }
    
    /**
     * 
     * @param type ‘METADATA’ or ‘CUBE’
     * @param name  Cache key, e.g the cube name.
     * @param action ‘create’, ‘update’ or ‘drop’
     * @return
     */
    public static String wipeCache(String type,String name,String action){
        String method = "POST";
        String para = "/cache/"+type+"/"+name+"/"+action;
        return excute(para,method,null); 
    }
    
    
    public static String query(String body){
        String  method = "POST";
        String para = "/query";
        
        return excute(para,method,body);
    }
    
    
    
    private  static String excute(String para,String method,String body){
    
        StringBuilder out = new StringBuilder();
        try {
            URL url = new URL(baseURL+para);        
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod(method);   
            connection.setDoOutput(true);
            connection.setRequestProperty  ("Authorization", "Basic " + encoding);
            connection.setRequestProperty("Content-Type","application/json");         
            if(body !=null){
                byte[] outputInBytes = body.getBytes("UTF-8");
                OutputStream os = connection.getOutputStream();
                os.write(outputInBytes);    
                os.close();
            }
            InputStream content = (InputStream)connection.getInputStream();  
            BufferedReader in  = new BufferedReader (new InputStreamReader (content)); 
            String line;
            while ((line = in.readLine()) != null) {
                out.append(line);
            }
            in.close();
            connection.disconnect();
            
        } catch(Exception e) {
            e.printStackTrace();
        }
        return out.toString();
    }
}