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// Copyright 2017 Twitter. All rights reserved.
//
// Licensed 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.

/**
 * 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 com.twitter.heron.api.bolt;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import com.twitter.heron.api.tuple.Tuple;
import com.twitter.heron.api.utils.Utils;

/**
 * This output collector exposes the API for emitting tuples from an IRichBolt.
 * This is the core API for emitting tuples. For a simpler API, and a more restricted
 * form of stream processing, see IBasicBolt and BasicOutputCollector.
 */
public class OutputCollector implements IOutputCollector {
  private IOutputCollector delegate;


  public OutputCollector(IOutputCollector aDelegate) {
    delegate = aDelegate;
  }

  /**
   * Emits a new tuple to a specific stream with a single anchor. The emitted values must be
   * immutable.
   *
   * @param streamId the stream to emit to
   * @param anchor the tuple to anchor to
   * @param tuple the new output tuple from this bolt
   * @return the list of task ids that this new tuple was sent to
   */
  public List emit(String streamId, Tuple anchor, List tuple) {
    return emit(streamId, Arrays.asList(anchor), tuple);
  }

  /**
   * Emits a new unanchored tuple to the specified stream. Because it's unanchored,
   * if a failure happens downstream, this new tuple won't affect whether any
   * spout tuples are considered failed or not. The emitted values must be
   * immutable.
   *
   * @param streamId the stream to emit to
   * @param tuple the new output tuple from this bolt
   * @return the list of task ids that this new tuple was sent to
   */
  public List emit(String streamId, List tuple) {
    return emit(streamId, (Collection) null, tuple);
  }

  /**
   * Emits a new tuple to the default stream anchored on a group of input tuples. The emitted
   * values must be immutable.
   *
   * @param anchors the tuples to anchor to
   * @param tuple the new output tuple from this bolt
   * @return the list of task ids that this new tuple was sent to
   */
  public List emit(Collection anchors, List tuple) {
    return emit(Utils.DEFAULT_STREAM_ID, anchors, tuple);
  }


  /**
   * Emits a new tuple to the default stream anchored on a single tuple. The emitted values must be
   * immutable.
   *
   * @param anchor the tuple to anchor to
   * @param tuple the new output tuple from this bolt
   * @return the list of task ids that this new tuple was sent to
   */
  public List emit(Tuple anchor, List tuple) {
    return emit(Utils.DEFAULT_STREAM_ID, anchor, tuple);
  }

  /**
   * Emits a new unanchored tuple to the default stream. Beacuse it's unanchored,
   * if a failure happens downstream, this new tuple won't affect whether any
   * spout tuples are considered failed or not. The emitted values must be
   * immutable.
   *
   * @param tuple the new output tuple from this bolt
   * @return the list of task ids that this new tuple was sent to
   */
  public List emit(List tuple) {
    return emit(Utils.DEFAULT_STREAM_ID, tuple);
  }

  /**
   * Emits a tuple directly to the specified task id on the specified stream.
   * If the target bolt does not subscribe to this bolt using a direct grouping,
   * the tuple will not be sent. If the specified output stream is not declared
   * as direct, or the target bolt subscribes with a non-direct grouping,
   * an error will occur at runtime. The emitted values must be
   * immutable.
   *
   * @param taskId the taskId to send the new tuple to
   * @param streamId the stream to send the tuple on. It must be declared as a direct stream in the topology definition.
   * @param anchor the tuple to anchor to
   * @param tuple the new output tuple from this bolt
   */
  public void emitDirect(int taskId, String streamId, Tuple anchor, List tuple) {
    emitDirect(taskId, streamId, Arrays.asList(anchor), tuple);
  }

  /**
   * Emits a tuple directly to the specified task id on the specified stream.
   * If the target bolt does not subscribe to this bolt using a direct grouping,
   * the tuple will not be sent. If the specified output stream is not declared
   * as direct, or the target bolt subscribes with a non-direct grouping,
   * an error will occur at runtime. Note that this method does not use anchors,
   * so downstream failures won't affect the failure status of any spout tuples.
   * The emitted values must be immutable.
   *
   * @param taskId the taskId to send the new tuple to
   * @param streamId the stream to send the tuple on. It must be declared as a direct stream in the topology definition.
   * @param tuple the new output tuple from this bolt
   */
  public void emitDirect(int taskId, String streamId, List tuple) {
    emitDirect(taskId, streamId, (Collection) null, tuple);
  }

  /**
   * Emits a tuple directly to the specified task id on the default stream.
   * If the target bolt does not subscribe to this bolt using a direct grouping,
   * the tuple will not be sent. If the specified output stream is not declared
   * as direct, or the target bolt subscribes with a non-direct grouping,
   * an error will occur at runtime. The emitted values must be
   * immutable.
   * 

   * 
The default stream must be declared as direct in the topology definition.
   * See OutputDeclarer#declare for how this is done when defining topologies
   * in Java.

   *
   * @param taskId the taskId to send the new tuple to
   * @param anchors the tuples to anchor to
   * @param tuple the new output tuple from this bolt
   */
  public void emitDirect(int taskId, Collection anchors, List tuple) {
    emitDirect(taskId, Utils.DEFAULT_STREAM_ID, anchors, tuple);
  }

  /**
   * Emits a tuple directly to the specified task id on the default stream.
   * If the target bolt does not subscribe to this bolt using a direct grouping,
   * the tuple will not be sent. If the specified output stream is not declared
   * as direct, or the target bolt subscribes with a non-direct grouping,
   * an error will occur at runtime. The emitted values must be
   * immutable.
   * 

   * 
The default stream must be declared as direct in the topology definition.
   * See OutputDeclarer#declare for how this is done when defining topologies
   * in Java.

   *
   * @param taskId the taskId to send the new tuple to
   * @param anchor the tuple to anchor to
   * @param tuple the new output tuple from this bolt
   */
  public void emitDirect(int taskId, Tuple anchor, List tuple) {
    emitDirect(taskId, Utils.DEFAULT_STREAM_ID, anchor, tuple);
  }


  /**
   * Emits a tuple directly to the specified task id on the default stream.
   * If the target bolt does not subscribe to this bolt using a direct grouping,
   * the tuple will not be sent. If the specified output stream is not declared
   * as direct, or the target bolt subscribes with a non-direct grouping,
   * an error will occur at runtime. The emitted values must be
   * immutable.
   * 

   * 
The default stream must be declared as direct in the topology definition.
   * See OutputDeclarer#declare for how this is done when defining topologies
   * in Java.

   * 

   * 
Note that this method does not use anchors, so downstream failures won't
   * affect the failure status of any spout tuples.

   *
   * @param taskId the taskId to send the new tuple to
   * @param tuple the new output tuple from this bolt
   */
  public void emitDirect(int taskId, List tuple) {
    emitDirect(taskId, Utils.DEFAULT_STREAM_ID, tuple);
  }

  @Override
  public List emit(String streamId, Collection anchors, List tuple) {
    return delegate.emit(streamId, anchors, tuple);
  }

  @Override
  public void emitDirect(
      int taskId,
      String streamId,
      Collection anchors,
      List tuple) {
    delegate.emitDirect(taskId, streamId, anchors, tuple);
  }

  @Override
  public void ack(Tuple input) {
    delegate.ack(input);
  }

  @Override
  public void fail(Tuple input) {
    delegate.fail(input);
  }

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

    

    

            

    

            



    
    






    
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