/*
* 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.AcquireOperation;
import com.hazelcast.concurrent.semaphore.operations.AvailableOperation;
import com.hazelcast.concurrent.semaphore.operations.DrainOperation;
import com.hazelcast.concurrent.semaphore.operations.InitOperation;
import com.hazelcast.concurrent.semaphore.operations.ReduceOperation;
import com.hazelcast.concurrent.semaphore.operations.ReleaseOperation;
import com.hazelcast.core.ISemaphore;
import com.hazelcast.spi.AbstractDistributedObject;
import com.hazelcast.spi.InternalCompletableFuture;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.OperationService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import static com.hazelcast.util.ExceptionUtil.rethrowAllowInterrupted;
import static com.hazelcast.util.ValidationUtil.isNotNegative;
public class SemaphoreProxy extends AbstractDistributedObject<SemaphoreService> implements ISemaphore {
private final String name;
private final int partitionId;
public SemaphoreProxy(String name, SemaphoreService service, NodeEngine nodeEngine) {
super(nodeEngine, service);
this.name = name;
this.partitionId = nodeEngine.getPartitionService().getPartitionId(getNameAsPartitionAwareData());
}
@Override
public String getName() {
return name;
}
@Override
public boolean init(int permits) {
isNotNegative(permits, "permits");
InitOperation operation = new InitOperation(name, permits);
InternalCompletableFuture<Boolean> future = invoke(operation);
return future.getSafely();
}
@Override
public void acquire() throws InterruptedException {
acquire(1);
}
@Override
public void acquire(int permits) throws InterruptedException {
isNotNegative(permits, "permits");
try {
AcquireOperation operation = new AcquireOperation(name, permits, -1);
InternalCompletableFuture<Object> future = invoke(operation);
future.get();
} catch (Throwable t) {
throw rethrowAllowInterrupted(t);
}
}
@Override
public int availablePermits() {
AvailableOperation operation = new AvailableOperation(name);
InternalCompletableFuture<Integer> future = invoke(operation);
return future.getSafely();
}
@Override
public int drainPermits() {
DrainOperation operation = new DrainOperation(name);
InternalCompletableFuture<Integer> future = invoke(operation);
return future.getSafely();
}
@Override
public void reducePermits(int reduction) {
isNotNegative(reduction, "reduction");
ReduceOperation operation = new ReduceOperation(name, reduction);
InternalCompletableFuture<Object> future = invoke(operation);
future.getSafely();
}
@Override
public void release() {
release(1);
}
@Override
public void release(int permits) {
isNotNegative(permits, "permits");
ReleaseOperation operation = new ReleaseOperation(name, permits);
InternalCompletableFuture future = invoke(operation);
future.getSafely();
}
@Override
public boolean tryAcquire() {
try {
return tryAcquire(1, 0, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
return false;
}
}
@Override
public boolean tryAcquire(int permits) {
try {
return tryAcquire(permits, 0, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
return false;
}
}
@Override
public boolean tryAcquire(long timeout, TimeUnit unit) throws InterruptedException {
return tryAcquire(1, timeout, unit);
}
@Override
public boolean tryAcquire(int permits, long timeout, TimeUnit unit) throws InterruptedException {
isNotNegative(permits, "permits");
try {
AcquireOperation operation = new AcquireOperation(name, permits, unit.toMillis(timeout));
Future<Boolean> future = invoke(operation);
return future.get();
} catch (Throwable t) {
throw rethrowAllowInterrupted(t);
}
}
private <T> InternalCompletableFuture<T> invoke(Operation operation) {
NodeEngine nodeEngine = getNodeEngine();
OperationService operationService = nodeEngine.getOperationService();
//noinspection unchecked
return (InternalCompletableFuture) operationService.invokeOnPartition(
SemaphoreService.SERVICE_NAME, operation, partitionId);
}
@Override
public String getServiceName() {
return SemaphoreService.SERVICE_NAME;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder("ISemaphore{");
sb.append("name='").append(name).append('\'');
sb.append('}');
return sb.toString();
}
}