flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/MapPartitionDescriptor.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.optimizer.operators;

import java.util.Collections;
import java.util.List;

import org.apache.flink.optimizer.dag.SingleInputNode;
import org.apache.flink.optimizer.dataproperties.GlobalProperties;
import org.apache.flink.optimizer.dataproperties.LocalProperties;
import org.apache.flink.optimizer.dataproperties.RequestedGlobalProperties;
import org.apache.flink.optimizer.dataproperties.RequestedLocalProperties;
import org.apache.flink.optimizer.plan.Channel;
import org.apache.flink.optimizer.plan.SingleInputPlanNode;
import org.apache.flink.runtime.operators.DriverStrategy;


public class MapPartitionDescriptor extends OperatorDescriptorSingle {

	@Override
	public DriverStrategy getStrategy() {
		return DriverStrategy.MAP_PARTITION;
	}

	@Override
	public SingleInputPlanNode instantiate(Channel in, SingleInputNode node) {
		return new SingleInputPlanNode(node, "MapPartition ("+node.getOperator().getName()+")", in, DriverStrategy.MAP_PARTITION);
	}

	@Override
	protected List<RequestedGlobalProperties> createPossibleGlobalProperties() {
		RequestedGlobalProperties rgp = new RequestedGlobalProperties();
		rgp.setAnyDistribution();
		return Collections.singletonList(rgp);
	}

	@Override
	protected List<RequestedLocalProperties> createPossibleLocalProperties() {
		return Collections.singletonList(new RequestedLocalProperties());
	}
	
	@Override
	public GlobalProperties computeGlobalProperties(GlobalProperties gProps) {
		return gProps;
	}
	
	@Override
	public LocalProperties computeLocalProperties(LocalProperties lProps) {
		return lProps;
	}
}