/*
 * 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.client;

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.util.TestLogger;

import org.junit.Test;

import java.io.Serializable;

import static junit.framework.TestCase.fail;


/**
 * Tests for {@link ExecutionEnvironment}.
 *
 * <p>NOTE: This test is in the flink-client package because we cannot have it in flink-java,
 * where the JSON plan generator is not available. Making it available, by depending on
 * flink-optimizer would create a cyclic dependency.
 */
public class ExecutionEnvironmentTest extends TestLogger implements Serializable {

	/**
	 * Tests that verifies consecutive calls to {@link ExecutionEnvironment#getExecutionPlan()} do
	 * not cause any exceptions. {@link ExecutionEnvironment#getExecutionPlan()} must not modify
	 * the
	 * state of the plan
	 */
	@Test
	public void testExecuteAfterGetExecutionPlanContextEnvironment() {
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

		DataSet<Integer> baseSet = env.fromElements(1, 2);

		DataSet<Integer> result = baseSet.map((MapFunction<Integer, Integer>) value -> value * 2);
		result.output(new DiscardingOutputFormat<>());

		try {
			env.getExecutionPlan();
			env.getExecutionPlan();
		} catch (Exception e) {
			fail("Consecutive #getExecutionPlan calls caused an exception.");
		}
	}
}

Verify that ExecutionEnvironment#getExecutionPlan() does not clear sinks