heron/api/src/java/com/twitter/heron/api/topology/OutputFieldsDeclarer.java

// Copyright 2016 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.

package com.twitter.heron.api.topology;

import com.twitter.heron.api.tuple.Fields;

public interface OutputFieldsDeclarer {
  /**
   * Uses default stream id.
   */
  void declare(Fields fields);

  void declare(boolean direct, Fields fields);

  void declareStream(String streamId, Fields fields);

  void declareStream(String streamId, boolean direct, Fields fields);
}