herddb.utils.BatchOrderedExecutor Maven / Gradle / Ivy
The newest version!
/*
Licensed to Diennea S.r.l. under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. Diennea S.r.l. 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 herddb.utils;
import herddb.core.HerdDBInternalException;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.function.Consumer;
/**
* Groups processing of data
*
* @author enrico.olivelli
*/
public class BatchOrderedExecutor implements Consumer {
private ArrayList batch;
private final int batchsize;
private int partialcount = 0;
private final Executor executor;
private final Comparator bufferComparator;
public interface Executor {
void execute(List batch) throws HerdDBInternalException;
}
public BatchOrderedExecutor(int batchsize, Executor executor, Comparator bufferComparator) {
this.batchsize = batchsize;
this.batch = new ArrayList<>();
this.executor = executor;
this.bufferComparator = bufferComparator;
}
@Override
public void accept(T object) {
batch.add(object);
if (++partialcount == batchsize) {
try {
batch.sort(bufferComparator);
executor.execute(batch);
} finally {
batch.clear();
partialcount = 0;
}
}
}
public void finish() throws HerdDBInternalException {
try {
if (!batch.isEmpty()) {
try {
batch.sort(bufferComparator);
executor.execute(batch);
} finally {
batch.clear();
partialcount = 0;
}
}
} finally {
batch = null;
}
}
}