/
LoopbackPartitioner.java
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/
LoopbackPartitioner.java
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/*
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
*
* Licensed 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. See accompanying LICENSE file.
*/
package io.s4.dispatcher.partitioner;
import io.s4.emitter.CommLayerEmitter;
import io.s4.emitter.EventEmitter;
import io.s4.listener.EventListener;
import io.s4.processor.PEContainer;
import java.util.ArrayList;
import java.util.List;
/**
* A partitioner that assigns events to the current partition, as given by the comm layer.
*
*/
public class LoopbackPartitioner implements Partitioner, VariableKeyPartitioner {
CommLayerEmitter emitter;
@Override
public List<CompoundKeyInfo> partition(String streamName,
List<List<String>> compoundKeyNames, Object event,
int partitionCount) {
List<CompoundKeyInfo> partitionInfoList = new ArrayList<CompoundKeyInfo>();
CompoundKeyInfo partitionInfo = new CompoundKeyInfo();
StringBuilder compoundKeyBuilder = new StringBuilder();
// This partitioning ignores the values of the keyed attributes;
// it partitions to the current partition id of the pe container
partitionInfo.setPartitionId(emitter.getListener().getId());
for (List<String> keyNames : compoundKeyNames) {
for (String keyName : keyNames) {
compoundKeyBuilder.append(keyName);
}
}
partitionInfo.setCompoundKey(compoundKeyBuilder.toString());
partitionInfoList.add(partitionInfo);
return partitionInfoList;
}
@Override
public List<CompoundKeyInfo> partition(String streamName, Object event,
int partitionCount) {
return partition(streamName, new ArrayList<List<String>>(0), event,
partitionCount);
}
/**
* A reference on the emitter allows getting the current partition id from the comm layer
* @param emitter comm layer emitter
*/
public void setEventEmitter(CommLayerEmitter emitter) {
this.emitter = emitter;
}
}