/*
* Copyright (c) 2008-2017, Hazelcast, 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.
*/
package com.hazelcast.map.impl.querycache.event.sequence;
import com.hazelcast.util.ConstructorFunction;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static com.hazelcast.util.ConcurrencyUtil.getOrPutIfAbsent;
/**
* This class provides on-demand {@link PartitionSequencer} implementations
* for subscriber side.
*
* @see PartitionSequencer
*/
public class DefaultSubscriberSequencerProvider implements SubscriberSequencerProvider {
private static final ConstructorFunction<Integer, PartitionSequencer> PARTITION_SEQUENCER_CONSTRUCTOR
= new ConstructorFunction<Integer, PartitionSequencer>() {
@Override
public PartitionSequencer createNew(Integer arg) {
return new DefaultPartitionSequencer();
}
};
private final ConcurrentMap<Integer, PartitionSequencer> partitionSequences;
public DefaultSubscriberSequencerProvider() {
this.partitionSequences = new ConcurrentHashMap<Integer, PartitionSequencer>();
}
@Override
public boolean compareAndSetSequence(long expect, long update, int partitionId) {
PartitionSequencer sequence = getOrCreateSequence(partitionId);
return sequence.compareAndSetSequence(expect, update);
}
@Override
public long getSequence(int partitionId) {
PartitionSequencer sequence = getOrCreateSequence(partitionId);
return sequence.getSequence();
}
@Override
public void reset(int partitionId) {
PartitionSequencer sequence = getOrCreateSequence(partitionId);
sequence.reset();
}
private PartitionSequencer getOrCreateSequence(int partitionId) {
return getOrPutIfAbsent(partitionSequences, partitionId, PARTITION_SEQUENCER_CONSTRUCTOR);
}
}