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.feed.dataflow;
  
  import java.nio.ByteBuffer;
  
  import org.apache.asterix.external.feed.management.FeedConnectionId;
  import org.apache.asterix.external.feed.policy.FeedPolicyAccessor;
  import org.apache.hyracks.api.comm.IFrameWriter;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  
  public class FeedFrameCollector implements IFrameWriter {
  
      private final FeedConnectionId connectionId;
      private IFrameWriter writer;
      private State state;
  
      public enum State {
          ACTIVE,
          FINISHED,
          TRANSITION,
          HANDOVER
      }
  
      public FeedFrameCollector(FeedPolicyAccessor feedPolicyAccessor, IFrameWriter writer,
              FeedConnectionId connectionId) {
          this.connectionId = connectionId;
          this.writer = writer;
          this.state = State.ACTIVE;
      }
  
      @Override
      public synchronized void close() throws HyracksDataException {
          writer.close();
          state = State.FINISHED;
          notify();
      }
  
      public synchronized void disconnect() {
          setState(State.FINISHED);
      }
  
      @Override
      public synchronized void nextFrame(ByteBuffer frame) throws HyracksDataException {
          writer.nextFrame(frame);
      }
  
      public synchronized State getState() {
          return state;
      }
  
      public synchronized void setState(State state) {
          this.state = state;
          switch (state) {
              case FINISHED:
              case HANDOVER:
                  notifyAll();
                  break;
              default:
                  break;
          }
      }
  
      public IFrameWriter getFrameWriter() {
          return writer;
      }
  
      public void setFrameWriter(IFrameWriter writer) {
          this.writer = writer;
      }
  
      @Override
      public String toString() {
          return "FrameCollector " + connectionId + "," + state + "]";
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o instanceof FeedFrameCollector) {
              return connectionId.equals(((FeedFrameCollector) o).connectionId);
          }
          return false;
      }
  
      @Override
      public int hashCode() {
          return connectionId.toString().hashCode();
      }
  
      @Override
      public synchronized void flush() throws HyracksDataException {
          writer.flush();
      }
  
      @Override
      public void open() throws HyracksDataException {
          writer.open();
      }
  
      @Override
      public void fail() throws HyracksDataException {
          writer.fail();
      }
  
      public FeedConnectionId getConnectionId() {
          return connectionId;
      }
  }
  