/*
 * 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.state.operator.restore.unkeyed;

import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.util.migration.MigrationVersion;
import org.apache.flink.test.state.operator.restore.ExecutionMode;

import static org.apache.flink.test.state.operator.restore.unkeyed.NonKeyedJob.createFirstStatefulMap;
import static org.apache.flink.test.state.operator.restore.unkeyed.NonKeyedJob.createSecondStatefulMap;
import static org.apache.flink.test.state.operator.restore.unkeyed.NonKeyedJob.createSource;
import static org.apache.flink.test.state.operator.restore.unkeyed.NonKeyedJob.createStatelessMap;
import static org.apache.flink.test.state.operator.restore.unkeyed.NonKeyedJob.createThirdStatefulMap;

/**
 * Verifies that the state of all operators is restored if a topology change creates a new chain.
 */
public class ChainUnionTest extends AbstractNonKeyedOperatorRestoreTestBase {

	public ChainUnionTest(MigrationVersion migrationVersion) {
		super(migrationVersion);
	}

	@Override
	public void createRestoredJob(StreamExecutionEnvironment env) {
		/**
		 * Original job: Source -> StatefulMap1 -> CHAIN(StatefulMap2 -> Map -> StatefulMap3)
		 * Modified job: Source -> CHAIN(StatefulMap1 -> StatefulMap2 -> Map -> StatefulMap3)
		 */
		DataStream<Integer> source = createSource(env, ExecutionMode.RESTORE);

		SingleOutputStreamOperator<Integer> first = createFirstStatefulMap(ExecutionMode.RESTORE, source);
		first.startNewChain();

		SingleOutputStreamOperator<Integer> second = createSecondStatefulMap(ExecutionMode.RESTORE, first);

		SingleOutputStreamOperator<Integer> stateless = createStatelessMap(second);

		SingleOutputStreamOperator<Integer> third = createThirdStatefulMap(ExecutionMode.RESTORE, stateless);
	}
}
