com.hazelcast.concurrent.atomicreference.AtomicReferenceService Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2016, 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.concurrent.atomicreference;
import com.hazelcast.concurrent.atomicreference.operations.AtomicReferenceReplicationOperation;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.partition.strategy.StringPartitioningStrategy;
import com.hazelcast.spi.ManagedService;
import com.hazelcast.spi.MigrationAwareService;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.PartitionMigrationEvent;
import com.hazelcast.spi.PartitionReplicationEvent;
import com.hazelcast.spi.RemoteService;
import com.hazelcast.spi.partition.IPartitionService;
import com.hazelcast.spi.partition.MigrationEndpoint;
import com.hazelcast.util.ConstructorFunction;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static com.hazelcast.util.ConcurrencyUtil.getOrPutIfAbsent;
public class AtomicReferenceService implements ManagedService, RemoteService, MigrationAwareService {
public static final String SERVICE_NAME = "hz:impl:atomicReferenceService";
private NodeEngine nodeEngine;
private final ConcurrentMap containers
= new ConcurrentHashMap();
private final ConstructorFunction atomicReferenceConstructorFunction =
new ConstructorFunction() {
public AtomicReferenceContainer createNew(String key) {
return new AtomicReferenceContainer();
}
};
public AtomicReferenceService() {
}
public AtomicReferenceContainer getReferenceContainer(String name) {
return getOrPutIfAbsent(containers, name, atomicReferenceConstructorFunction);
}
@Override
public void init(NodeEngine nodeEngine, Properties properties) {
this.nodeEngine = nodeEngine;
}
@Override
public void reset() {
containers.clear();
}
@Override
public void shutdown(boolean terminate) {
reset();
}
@Override
public AtomicReferenceProxy createDistributedObject(String name) {
return new AtomicReferenceProxy(name, nodeEngine, this);
}
@Override
public void destroyDistributedObject(String name) {
containers.remove(name);
}
@Override
public void beforeMigration(PartitionMigrationEvent partitionMigrationEvent) {
}
@Override
public Operation prepareReplicationOperation(PartitionReplicationEvent event) {
if (event.getReplicaIndex() > 1) {
return null;
}
Map data = new HashMap();
int partitionId = event.getPartitionId();
for (Map.Entry containerEntry : containers.entrySet()) {
String name = containerEntry.getKey();
if (partitionId == getPartitionId(name)) {
AtomicReferenceContainer atomicReferenceContainer = containerEntry.getValue();
Data value = atomicReferenceContainer.get();
data.put(name, value);
}
}
return data.isEmpty() ? null : new AtomicReferenceReplicationOperation(data);
}
@Override
public void commitMigration(PartitionMigrationEvent event) {
if (event.getMigrationEndpoint() == MigrationEndpoint.SOURCE) {
int thresholdReplicaIndex = event.getNewReplicaIndex();
if (thresholdReplicaIndex == -1 || thresholdReplicaIndex > 1) {
clearPartitionReplica(event.getPartitionId());
}
}
}
@Override
public void rollbackMigration(PartitionMigrationEvent event) {
if (event.getMigrationEndpoint() == MigrationEndpoint.DESTINATION) {
int thresholdReplicaIndex = event.getCurrentReplicaIndex();
if (thresholdReplicaIndex == -1 || thresholdReplicaIndex > 1) {
clearPartitionReplica(event.getPartitionId());
}
}
}
private void clearPartitionReplica(int partitionId) {
final Iterator iterator = containers.keySet().iterator();
while (iterator.hasNext()) {
String name = iterator.next();
if (getPartitionId(name) == partitionId) {
iterator.remove();
}
}
}
private int getPartitionId(String name) {
IPartitionService partitionService = nodeEngine.getPartitionService();
String partitionKey = StringPartitioningStrategy.getPartitionKey(name);
return partitionService.getPartitionId(partitionKey);
}
}