flink-java/src/test/java/org/apache/flink/api/java/MultipleInvokationsTest.java

/*
 * 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.api.java;

import org.apache.flink.api.common.Plan;
import org.apache.flink.api.common.operators.GenericDataSinkBase;
import org.apache.flink.api.java.io.DiscardingOutputFormat;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

/**
 * Tests for multiple invocations of a plan.
 */
public class MultipleInvokationsTest {

	@Test
	public void testMultipleInvocationsGetPlan() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

			// ----------- Execution 1 ---------------

			DataSet<String> data = env.fromElements("Some", "test", "data").name("source1");
			//data.print();
			data.output(new DiscardingOutputFormat<String>()).name("print1");
			data.output(new DiscardingOutputFormat<String>()).name("output1");

			{
				Plan p = env.createProgramPlan();

				assertEquals(2, p.getDataSinks().size());
				for (GenericDataSinkBase<?> sink : p.getDataSinks()) {
					assertTrue(sink.getName().equals("print1") || sink.getName().equals("output1"));
					assertEquals("source1", sink.getInput().getName());
				}
			}

			// ----------- Execution 2 ---------------

			data.writeAsText("/some/file/path").name("textsink");

			{
				Plan p = env.createProgramPlan();

				assertEquals(1, p.getDataSinks().size());
				GenericDataSinkBase<?> sink = p.getDataSinks().iterator().next();
				assertEquals("textsink", sink.getName());
				assertEquals("source1", sink.getInput().getName());
			}
		}
		catch (Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
}