/*
 * 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 org.apache.flink.stormcompatibility.wordcount;

import org.apache.flink.api.java.tuple.Tuple0;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.source.ParallelSourceFunction;
import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
import org.apache.flink.streaming.api.operators.Output;
import org.apache.flink.streaming.api.watermark.Watermark;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.streaming.runtime.tasks.StreamingRuntimeContext;

public class TestEmptyTuple {

	public static void main(String[] args) throws Exception {
		final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

		DataStream<Tuple0> input = env.addSource(new Empty()).setParallelism(4);
		input.shuffle().transform("verify", null, new Counter()).setParallelism(1);

		env.execute();
	}

	public static class Empty implements ParallelSourceFunction<Tuple0> {
		private static final long serialVersionUID = 1350902748274781033L;
		private volatile boolean isRunning = true;

		@Override
		public void run(
				org.apache.flink.streaming.api.functions.source.SourceFunction.SourceContext<Tuple0> ctx)
						throws Exception {
			while (this.isRunning) {
				Thread.sleep(1000);
				ctx.collect(new Tuple0());
			}

		}

		@Override
		public void cancel() {
			this.isRunning = false;
		}

	}

	public static class Counter implements OneInputStreamOperator<Tuple0,Object> {
		private static final long serialVersionUID = 5518823010274195186L;

		@Override
		public void setup(Output<StreamRecord<Object>> output,
				StreamingRuntimeContext runtimeContext) {
			// TODO Auto-generated method stub

		}

		@Override
		public void open(Configuration config) throws Exception {
			// TODO Auto-generated method stub

		}

		@Override
		public void close() throws Exception {
			// TODO Auto-generated method stub

		}

		@Override
		public StreamingRuntimeContext getRuntimeContext() {
			// TODO Auto-generated method stub
			return null;
		}

		@Override
		public boolean isInputCopyingDisabled() {
			// TODO Auto-generated method stub
			return false;
		}

		@Override
		public void setChainingStrategy(
				org.apache.flink.streaming.api.operators.StreamOperator.ChainingStrategy strategy) {
			// TODO Auto-generated method stub

		}

		@Override
		public org.apache.flink.streaming.api.operators.StreamOperator.ChainingStrategy getChainingStrategy() {
			// TODO Auto-generated method stub
			return null;
		}

		private int counter = 0;
		@Override
		public void processElement(StreamRecord<Tuple0> element) throws Exception {
			System.out.println("Tuple0: " + (++counter));
		}

		@Override
		public void processWatermark(Watermark mark) throws Exception {
			// TODO Auto-generated method stub

		}



	}

}