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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.

package com.twitter.heron.streamlet;

import java.io.Serializable;

/**
 * Sink is how Streamlet's end. The put method
 * invocation consumes the tuple into say external database/cache, etc.
 * setup/cleanup is where the sink can do any one time setup work, like
 * establishing/closing connection to sources, etc.
 */
public interface Sink extends Serializable {
  void setup(Context context);
  void put(T tuple);
  void cleanup();
}