content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.asterix.external.adapter.factory;
  
  import java.util.Map;
  
  import org.apache.asterix.common.api.INcApplicationContext;
  import org.apache.asterix.common.dataflow.ICcApplicationContext;
  import org.apache.asterix.common.external.IDataSourceAdapter;
  import org.apache.asterix.common.external.IExternalFilterEvaluatorFactory;
  import org.apache.asterix.common.functions.ExternalFunctionLanguage;
  import org.apache.asterix.common.library.ILibrary;
  import org.apache.asterix.common.library.ILibraryManager;
  import org.apache.asterix.common.metadata.DataverseName;
  import org.apache.asterix.common.metadata.Namespace;
  import org.apache.asterix.external.api.IExternalDataSourceFactory;
  import org.apache.asterix.external.api.ITypedAdapterFactory;
  import org.apache.asterix.external.input.filter.NoOpExternalFilterEvaluatorFactory;
  import org.apache.asterix.external.library.JavaLibrary;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.hyracks.algebricks.common.constraints.AlgebricksAbsolutePartitionConstraint;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.api.application.ICCServiceContext;
  import org.apache.hyracks.api.application.INCServiceContext;
  import org.apache.hyracks.api.context.IHyracksTaskContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.IWarningCollector;
  
  public final class ExternalAdapterFactory implements ITypedAdapterFactory {
  
      private static final long serialVersionUID = 2L;
  
      private final DataverseName libraryDataverse;
  
      private final String libraryName;
  
      private final String className;
      private final String libraryDatabase;
  
      private ARecordType outputType;
  
      private ARecordType metaType;
  
      private Map<String, String> configuration;
  
      private transient ICCServiceContext serviceContext;
  
      public ExternalAdapterFactory(String libraryDatabase, DataverseName libraryDataverse, String libraryName,
              String className) {
          this.libraryDatabase = libraryDatabase;
          this.libraryDataverse = libraryDataverse;
          this.libraryName = libraryName;
          this.className = className;
      }
  
      @Override
      public void configure(ICCServiceContext serviceContext, Map<String, String> configuration,
              IWarningCollector warningCollector, IExternalFilterEvaluatorFactory filterEvaluatorFactory) {
          this.serviceContext = serviceContext;
          this.configuration = configuration;
      }
  
      @Override
      public AlgebricksAbsolutePartitionConstraint getPartitionConstraint() throws AlgebricksException {
          //TODO:needs to be specified in the adapter configuration
          ICcApplicationContext appCtx = (ICcApplicationContext) serviceContext.getApplicationContext();
          return IExternalDataSourceFactory.getPartitionConstraints(appCtx, null, 1);
      }
  
      @Override
      public IDataSourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws HyracksDataException {
          INCServiceContext serviceCtx = ctx.getJobletContext().getServiceContext();
          INcApplicationContext appCtx = (INcApplicationContext) serviceCtx.getApplicationContext();
          ILibraryManager libraryManager = appCtx.getLibraryManager();
          ILibrary library = libraryManager.getLibrary(new Namespace(libraryDatabase, libraryDataverse), libraryName);
          if (ExternalFunctionLanguage.JAVA != library.getLanguage()) {
              throw new HyracksDataException("Unexpected library language: " + library.getLanguage());
          }
          ClassLoader cl = ((JavaLibrary) library).getClassLoader();
          try {
              ITypedAdapterFactory adapterFactory = (ITypedAdapterFactory) cl.loadClass(className).newInstance();
              adapterFactory.setOutputType(outputType);
              adapterFactory.setMetaType(metaType);
              adapterFactory.configure(null, configuration, ctx.getWarningCollector(),
                      NoOpExternalFilterEvaluatorFactory.INSTANCE);
              return adapterFactory.createAdapter(ctx, partition);
          } catch (InstantiationException | IllegalAccessException | ClassNotFoundException | AlgebricksException e) {
              throw HyracksDataException.create(e);
          }
      }
  
      @Override
      public void setOutputType(ARecordType outputType) {
          this.outputType = outputType;
      }
  
      @Override
      public ARecordType getOutputType() {
          return outputType;
      }
  
      @Override
      public void setMetaType(ARecordType metaType) {
          this.metaType = metaType;
      }
  
      @Override
      public ARecordType getMetaType() {
          return metaType;
      }
  
      @Override
      public String getAlias() {
          return "external:" + className;
      }
  
      public String getLibraryDatabase() {
          return libraryDatabase;
      }
  
      public DataverseName getLibraryDataverse() {
          return libraryDataverse;
      }
  
      public String getLibraryName() {
          return libraryName;
      }
  
      public String getClassName() {
          return className;
      }
  }
  