/*
 * 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.test.runtime;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.io.DiscardingOutputFormat;
import org.apache.flink.api.java.tuple.Tuple1;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.test.util.JavaProgramTestBase;

public class ConsumePipelinedAndBlockingResultITCase extends JavaProgramTestBase {

	@Override
	protected void testProgram() throws Exception {
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		env.setParallelism(1);

		DataSet<Tuple1<Long>> pipelinedSource = env.fromElements(new Tuple1<Long>(1l));

		DataSet<Tuple1<Long>> slowBlockingSource = env.generateSequence(0, 10).map(
				new MapFunction<Long, Tuple1<Long>>() {
					@Override
					public Tuple1<Long> map(Long value) throws Exception {
						Thread.sleep(200);

						return new Tuple1<Long>(value);
					}
				}
		);

		slowBlockingSource.join(slowBlockingSource)
				.where(0).equalTo(0).output(new DiscardingOutputFormat<Tuple2<Tuple1<Long>, Tuple1<Long>>>());

		// Join the slow blocking and the pipelined source. This test should verify that this works
		// w/o problems and the blocking result is not requested too early.
		pipelinedSource.join(slowBlockingSource)
				.where(0).equalTo(0)
				.output(new DiscardingOutputFormat<Tuple2<Tuple1<Long>, Tuple1<Long>>>());

		env.execute("Consume one pipelined and one blocking result test job");
	}

	@Override
	protected boolean skipCollectionExecution() {
		// Skip collection execution as it is independent of the runtime environment functionality,
		// which is under test.
		return true;
	}
}