org.springframework.batch.core.jsr.partition.PartitionCollectorAdapter Maven / Gradle / Ivy
/*
* Copyright 2013-2018 the original author or authors.
*
* 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
*
* https://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.springframework.batch.core.jsr.partition;
import java.io.Serializable;
import java.util.Queue;
import java.util.concurrent.locks.ReentrantLock;
import javax.batch.api.partition.PartitionCollector;
import javax.batch.operations.BatchRuntimeException;
import org.springframework.batch.core.ChunkListener;
import org.springframework.batch.core.scope.context.ChunkContext;
import org.springframework.util.Assert;
/**
* Adapter class used to wrap a {@link PartitionCollector} so that it can be consumed
* as a {@link ChunkListener}. A thread-safe {@link Queue} is required along with the
* {@link PartitionCollector}. The {@link Queue} is where the result of the call to
* the PartitionCollector will be placed.
*
* @author Michael Minella
* @author Mahmoud Ben Hassine
* @since 3.0
*/
public class PartitionCollectorAdapter implements ChunkListener {
private PartitionCollector collector;
private Queue partitionQueue;
private ReentrantLock lock;
public PartitionCollectorAdapter(Queue queue, PartitionCollector collector) {
Assert.notNull(queue, "A thread-safe Queue is required");
Assert.notNull(collector, "A PartitionCollector is required");
this.partitionQueue = queue;
this.collector = collector;
}
public void setPartitionLock(ReentrantLock lock) {
this.lock = lock;
}
@Override
public void beforeChunk(ChunkContext context) {
}
@Override
public void afterChunk(ChunkContext context) {
try {
if(context.isComplete()) {
lock.lock();
Serializable collectPartitionData = collector.collectPartitionData();
if(collectPartitionData != null) {
partitionQueue.add(collectPartitionData);
}
}
} catch (Throwable e) {
throw new BatchRuntimeException("An error occurred while collecting data from the PartitionCollector", e);
} finally {
if(lock.isHeldByCurrentThread()) {
lock.unlock();
}
}
}
@Override
public void afterChunkError(ChunkContext context) {
try {
lock.lock();
if(context.isComplete()) {
Serializable collectPartitionData = collector.collectPartitionData();
if(collectPartitionData != null) {
partitionQueue.add(collectPartitionData);
}
}
} catch (Throwable e) {
throw new BatchRuntimeException("An error occurred while collecting data from the PartitionCollector", e);
} finally {
if(lock.isHeldByCurrentThread()) {
lock.unlock();
}
}
}
}