SpoutOutputCollectorImpl.java

/**
 * 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 backtype.storm.spout;

import java.util.List;

import backtype.storm.utils.Utils;

/**
 * This output collector exposes the API for emitting tuples from an {@link backtype.storm.topology.IRichSpout}.
 * The main difference between this output collector and {@link backtype.storm.task.OutputCollector}
 * for {@link backtype.storm.topology.IRichBolt} is that spouts can tag messages with ids so that they can be
 * acked or failed later on. This is the Spout portion of Storm's API to
 * guarantee that each message is fully processed at least once.
 */
public class SpoutOutputCollectorImpl extends SpoutOutputCollector {
  private com.twitter.heron.api.spout.SpoutOutputCollector delegate;

  public SpoutOutputCollectorImpl(com.twitter.heron.api.spout.SpoutOutputCollector delegate) {
    super(null);
    this.delegate = delegate;
  }

  @Override
  public List<Integer> emit(String streamId, List<Object> tuple, Object messageId) {
    return delegate.emit(streamId, tuple, messageId);
  }

  @Override
  public List<Integer> emit(List<Object> tuple, Object messageId) {
    return emit(Utils.DEFAULT_STREAM_ID, tuple, messageId);
  }

  @Override
  public List<Integer> emit(List<Object> tuple) {
    return emit(tuple, null);
  }

  @Override
  public List<Integer> emit(String streamId, List<Object> tuple) {
    return emit(streamId, tuple, null);
  }

  @Override
  public void emitDirect(int taskId, String streamId, List<Object> tuple, Object messageId) {
    delegate.emitDirect(taskId, streamId, tuple, messageId);
  }

  @Override
  public void emitDirect(int taskId, List<Object> tuple, Object messageId) {
    emitDirect(taskId, Utils.DEFAULT_STREAM_ID, tuple, messageId);
  }

  @Override
  public void emitDirect(int taskId, String streamId, List<Object> tuple) {
    emitDirect(taskId, streamId, tuple, null);
  }

  @Override
  public void emitDirect(int taskId, List<Object> tuple) {
    emitDirect(taskId, tuple, null);
  }

  @Override
  public void reportError(Throwable error) {
    delegate.reportError(error);
  }
}