/*
 * 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.runtime.scheduler.strategy;

import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * A simple implementation of {@link SchedulingPipelinedRegion} for testing.
 */
public class TestingSchedulingPipelinedRegion implements SchedulingPipelinedRegion {

	private final Map<ExecutionVertexID, TestingSchedulingExecutionVertex> regionVertices = new HashMap<>();

	private final Set<TestingSchedulingResultPartition> consumedPartitions = new HashSet<>();

	public TestingSchedulingPipelinedRegion(final Set<TestingSchedulingExecutionVertex> vertices) {
		for (TestingSchedulingExecutionVertex vertex : vertices) {
			regionVertices.put(vertex.getId(), vertex);

			for (TestingSchedulingResultPartition consumedPartition : vertex.getConsumedResults()) {
				if (!vertices.contains(consumedPartition.getProducer())) {
					consumedPartitions.add(consumedPartition);
				}
			}
		}
	}

	@Override
	public Iterable<TestingSchedulingExecutionVertex> getVertices() {
		return Collections.unmodifiableCollection(regionVertices.values());
	}

	@Override
	public TestingSchedulingExecutionVertex getVertex(ExecutionVertexID vertexId) {
		return regionVertices.get(vertexId);
	}

	@Override
	public Iterable<TestingSchedulingResultPartition> getConsumedResults() {
		return Collections.unmodifiableSet(consumedPartitions);
	}
}

@@ -2029,43 +2029,273 @@
 %7B%0A%09%09
-return regionVertices.get(vertexId)
+final TestingSchedulingExecutionVertex executionVertex = regionVertices.get(vertexId);%0A%09%09if (executionVertex == null) %7B%0A%09%09%09throw new IllegalArgumentException(String.format(%22Execution vertex %25s not found in pipelined region%22, vertexId));%0A%09%09%7D%0A%09%09return executionVertex
 ;%0A%09%7D

Throw exception from TestingSchedulingPipelinedRegion#getVertex() for unknown vertices