solr dataimport 数据导入源码分析（七）

在solr dataimport 数据导入源码分析（五） 提到了contextimpl类调用DataImporter对象获取数据源 

 contextimpl.java

 private DataSource ds;

  



private DataImporter dataImporter;



   



@Override



  public DataSource getDataSource() {



    if (ds != null) return ds;



    if(entity == null) return  null;



    if (entity.dataSrc == null) {



      entity.dataSrc = dataImporter.getDataSourceInstance(entity, entity.dataSource, this);



    }



    if (entity.dataSrc != null && docBuilder != null && docBuilder.verboseDebug &&



             Context.FULL_DUMP.equals(currentProcess())) {



      //debug is not yet implemented properly for deltas



      entity.dataSrc = docBuilder.getDebugLogger().wrapDs(entity.dataSrc);



    }



    return entity.dataSrc;



  }

我们跟踪源码，在DataImporter.java里面调用了jdbcDataSource对象方法

参考solr dataimport 数据导入源码分析（二） DataImporter.java 源码

DataImporter.java  

 DataSource getDataSourceInstance(DataConfig.Entity key, String name, Context ctx) {

    Properties p = dataSourceProps.get(name);

    if (p == null)

      p = config.dataSources.get(name);

    if (p == null)

      p = dataSourceProps.get(null);// for default data source

    if (p == null)

      p = config.dataSources.get(null);

    if (p == null)  

      throw new DataImportHandlerException(SEVERE,

              "No dataSource :" + name + " available for entity :"

                      + key.name);

    String type = p.getProperty(TYPE);

    DataSource dataSrc = null;

    if (type == null) {

      dataSrc = new JdbcDataSource();

    } else {

      try {

        dataSrc = (DataSource) DocBuilder.loadClass(type, getCore()).newInstance();

      } catch (Exception e) {

        wrapAndThrow(SEVERE, e, "Invalid type for data source: " + type);

      }

    }

    try {

      Properties copyProps = new Properties();

      copyProps.putAll(p);

      Map<String, Object> map = ctx.getRequestParameters();

      if (map.containsKey("rows")) {

        int rows = Integer.parseInt((String) map.get("rows"));

        if (map.containsKey("start")) {

          rows += Integer.parseInt((String) map.get("start"));

        }

        copyProps.setProperty("maxRows", String.valueOf(rows));

      }

      dataSrc.init(ctx, copyProps);

    } catch (Exception e) {

      wrapAndThrow(SEVERE, e, "Failed to initialize DataSource: " + key.dataSource);

    }

    return dataSrc;

  }