/
ObjectBatchResetter.java
118 lines (101 loc) · 3.29 KB
/
ObjectBatchResetter.java
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/*
* Copyright 2018 Deutsche Nationalbibliothek
*
* 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.
*/
package org.metafacture.flowcontrol;
import org.metafacture.framework.FluxCommand;
import org.metafacture.framework.ObjectReceiver;
import org.metafacture.framework.annotations.Description;
import org.metafacture.framework.annotations.In;
import org.metafacture.framework.annotations.Out;
import org.metafacture.framework.helpers.DefaultObjectPipe;
/**
* Resets the downstream modules every {@link #setBatchSize(int) batch-size} objects.
*
* @param <T> object type
* @author Christoph Böhme
*/
@Description("Resets the downstream modules every batch-size objects")
@FluxCommand("reset-object-batch")
@In(Object.class)
@Out(Object.class)
public class ObjectBatchResetter<T> extends DefaultObjectPipe<T, ObjectReceiver<T>> {
public static final int DEFAULT_BATCH_SIZE = 1000;
private int batchSize = DEFAULT_BATCH_SIZE;
private long batchCount;
private int objectCount;
/**
* Creates an instance of {@link ObjectBatchResetter}.
*/
public ObjectBatchResetter() {
}
/**
* Number of objects after which a <i>reset-stream</i> event is triggered.
* <p>
* The default value is {@value #DEFAULT_BATCH_SIZE}.
* <p>
* This parameter can be changed anytime during processing. If the new value is
* less than the number of received objects a <i>reset-stream</i> event is
* emitted when the next object is received.
*
* @param batchSize number of objects before a <i>reset-stream</i> event is
* triggered
*/
public void setBatchSize(final int batchSize) {
this.batchSize = batchSize;
}
/**
* Gets the size of the batch.
*
* @return the size of the batch
*/
public int getBatchSize() {
return batchSize;
}
/**
* Returns the number of batches that were processed.
* <p>
* This counter is reset when this module receives a <i>reset-stream</i> event.
*
* @return number of batches
*/
public long getBatchCount() {
return batchCount;
}
/**
* Returns the number of objects in the current batch.
* <p>
* This counter is reset after each batch and also when the module receives a <i>reset-stream</i> event.
*
* @return number of objects in the current batch
*/
public int getObjectCount() {
return objectCount;
}
@Override
public void process(final T obj) {
getReceiver().process(obj);
objectCount += 1;
if (objectCount >= batchSize) {
batchCount += 1;
objectCount = 0;
getReceiver().resetStream();
}
}
@Override
protected void onResetStream() {
batchCount = 0;
objectCount = 0;
}
}