/*
* Copyright (c) 2008-2013, 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.semaphore;
import com.hazelcast.concurrent.semaphore.operations.SemaphoreDeadMemberOperation;
import com.hazelcast.concurrent.semaphore.operations.SemaphoreReplicationOperation;
import com.hazelcast.config.SemaphoreConfig;
import com.hazelcast.nio.Address;
import com.hazelcast.partition.InternalPartition;
import com.hazelcast.partition.MigrationEndpoint;
import com.hazelcast.partition.InternalPartitionService;
import com.hazelcast.spi.ClientAwareService;
import com.hazelcast.spi.ManagedService;
import com.hazelcast.spi.MemberAttributeServiceEvent;
import com.hazelcast.spi.MembershipAwareService;
import com.hazelcast.spi.MembershipServiceEvent;
import com.hazelcast.spi.MigrationAwareService;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.OperationService;
import com.hazelcast.spi.PartitionMigrationEvent;
import com.hazelcast.spi.PartitionReplicationEvent;
import com.hazelcast.spi.RemoteService;
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.partition.strategy.StringPartitioningStrategy.getPartitionKey;
import static com.hazelcast.spi.impl.ResponseHandlerFactory.createEmptyResponseHandler;
import static com.hazelcast.util.ConcurrencyUtil.getOrPutIfAbsent;
public class SemaphoreService implements ManagedService, MigrationAwareService, MembershipAwareService,
RemoteService, ClientAwareService {
public static final String SERVICE_NAME = "hz:impl:semaphoreService";
private final ConcurrentMap<String, Permit> permitMap = new ConcurrentHashMap<String, Permit>();
private final ConstructorFunction<String, Permit> permitConstructor = new ConstructorFunction<String, Permit>() {
public Permit createNew(String name) {
SemaphoreConfig config = nodeEngine.getConfig().findSemaphoreConfig(name);
InternalPartitionService partitionService = nodeEngine.getPartitionService();
int partitionId = partitionService.getPartitionId(getPartitionKey(name));
return new Permit(partitionId, new SemaphoreConfig(config));
}
};
private final NodeEngine nodeEngine;
public SemaphoreService(NodeEngine nodeEngine) {
this.nodeEngine = nodeEngine;
}
public Permit getOrCreatePermit(String name) {
return getOrPutIfAbsent(permitMap, name, permitConstructor);
}
// need for testing..
public boolean containsSemaphore(String name) {
return permitMap.containsKey(name);
}
@Override
public void init(NodeEngine nodeEngine, Properties properties) {
}
@Override
public void reset() {
permitMap.clear();
}
@Override
public void shutdown(boolean terminate) {
permitMap.clear();
}
@Override
public void memberAdded(MembershipServiceEvent event) {
}
@Override
public void memberRemoved(MembershipServiceEvent event) {
String caller = event.getMember().getUuid();
onOwnerDisconnected(caller);
}
@Override
public void memberAttributeChanged(MemberAttributeServiceEvent event) {
}
private void onOwnerDisconnected(final String caller) {
InternalPartitionService partitionService = nodeEngine.getPartitionService();
OperationService operationService = nodeEngine.getOperationService();
Address thisAddress = nodeEngine.getThisAddress();
for (String name : permitMap.keySet()) {
int partitionId = partitionService.getPartitionId(getPartitionKey(name));
InternalPartition partition = partitionService.getPartition(partitionId);
if (thisAddress.equals(partition.getOwner())) {
Operation op = new SemaphoreDeadMemberOperation(name, caller)
.setPartitionId(partitionId)
.setResponseHandler(createEmptyResponseHandler())
.setService(this)
.setNodeEngine(nodeEngine)
.setServiceName(SERVICE_NAME);
operationService.executeOperation(op);
}
}
}
@Override
public SemaphoreProxy createDistributedObject(String objectId) {
return new SemaphoreProxy(objectId, this, nodeEngine);
}
@Override
public void destroyDistributedObject(String objectId) {
permitMap.remove(objectId);
}
@Override
public void beforeMigration(PartitionMigrationEvent partitionMigrationEvent) {
}
@Override
public Operation prepareReplicationOperation(PartitionReplicationEvent event) {
Map<String, Permit> migrationData = new HashMap<String, Permit>();
for (Map.Entry<String, Permit> entry : permitMap.entrySet()) {
String name = entry.getKey();
Permit permit = entry.getValue();
if (permit.getPartitionId() == event.getPartitionId() && permit.getTotalBackupCount() >= event.getReplicaIndex()) {
migrationData.put(name, permit);
}
}
if (migrationData.isEmpty()) {
return null;
}
return new SemaphoreReplicationOperation(migrationData);
}
public void insertMigrationData(Map<String, Permit> migrationData) {
permitMap.putAll(migrationData);
}
@Override
public void commitMigration(PartitionMigrationEvent event) {
if (event.getMigrationEndpoint() == MigrationEndpoint.SOURCE) {
clearMigrationData(event.getPartitionId());
}
}
private void clearMigrationData(int partitionId) {
Iterator<Map.Entry<String, Permit>> it = permitMap.entrySet().iterator();
while (it.hasNext()) {
Permit permit = it.next().getValue();
if (permit.getPartitionId() == partitionId) {
it.remove();
}
}
}
@Override
public void rollbackMigration(PartitionMigrationEvent event) {
if (event.getMigrationEndpoint() == MigrationEndpoint.DESTINATION) {
clearMigrationData(event.getPartitionId());
}
}
@Override
public void clearPartitionReplica(int partitionId) {
clearMigrationData(partitionId);
}
@Override
public void clientDisconnected(String clientUuid) {
onOwnerDisconnected(clientUuid);
}
}