com.twitter.heron.streamlet.Source Maven / Gradle / Ivy
// 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;
import java.util.Collection;
/**
* Source is how Streamlet's originate. The get method
* invocation returns new element that form the tuples of the streamlet.
* setup/cleanup is where the generator can do any one time setup work, like
* establishing/closing connection to sources, etc.
*/
public interface Source extends Serializable {
void setup(Context context);
Collection get();
void cleanup();
}