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/*
* 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.collection.txn;
import com.hazelcast.collection.CollectionItem;
import com.hazelcast.collection.CollectionSizeOperation;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.spi.AbstractDistributedObject;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.OperationService;
import com.hazelcast.spi.RemoteService;
import com.hazelcast.transaction.TransactionException;
import com.hazelcast.transaction.TransactionNotActiveException;
import com.hazelcast.transaction.impl.Transaction;
import com.hazelcast.transaction.impl.TransactionSupport;
import com.hazelcast.util.ExceptionUtil;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.Future;
public abstract class AbstractTransactionalCollectionProxy extends AbstractDistributedObject {
protected final String name;
protected final TransactionSupport tx;
protected final int partitionId;
protected final Set itemIdSet = new HashSet();
public AbstractTransactionalCollectionProxy(String name, TransactionSupport tx, NodeEngine nodeEngine, S service) {
super(nodeEngine, service);
this.name = name;
this.tx = tx;
this.partitionId = nodeEngine.getPartitionService().getPartitionId(getNameAsPartitionAwareData());
}
protected abstract Collection getCollection();
@Override
public String getName() {
return name;
}
public boolean add(E e) {
checkTransactionState();
throwExceptionIfNull(e);
final NodeEngine nodeEngine = getNodeEngine();
final Data value = nodeEngine.toData(e);
CollectionReserveAddOperation operation = new CollectionReserveAddOperation(name, tx.getTxnId(), null);
try {
Future f = nodeEngine.getOperationService().invokeOnPartition(getServiceName(), operation, partitionId);
Long itemId = f.get();
if (itemId != null) {
if (!itemIdSet.add(itemId)) {
throw new TransactionException("Duplicate itemId: " + itemId);
}
getCollection().add(new CollectionItem(itemId, value));
CollectionTxnAddOperation op = new CollectionTxnAddOperation(name, itemId, value);
final String serviceName = getServiceName();
final String txnId = tx.getTxnId();
tx.addTransactionLog(new CollectionTransactionLog(itemId, name, partitionId, serviceName, txnId, op));
return true;
}
} catch (Throwable t) {
throw ExceptionUtil.rethrow(t);
}
return false;
}
public boolean remove(E e) {
checkTransactionState();
throwExceptionIfNull(e);
final NodeEngine nodeEngine = getNodeEngine();
final Data value = nodeEngine.toData(e);
final Iterator iterator = getCollection().iterator();
long reservedItemId = -1;
while (iterator.hasNext()) {
final CollectionItem item = iterator.next();
if (value.equals(item.getValue())) {
reservedItemId = item.getItemId();
break;
}
}
final CollectionReserveRemoveOperation operation = new CollectionReserveRemoveOperation(
name,
reservedItemId,
value,
tx.getTxnId());
try {
final OperationService operationService = nodeEngine.getOperationService();
Future f = operationService.invokeOnPartition(getServiceName(), operation, partitionId);
CollectionItem item = f.get();
if (item != null) {
if (reservedItemId == item.getItemId()) {
iterator.remove();
tx.removeTransactionLog(reservedItemId);
itemIdSet.remove(reservedItemId);
return true;
}
if (!itemIdSet.add(item.getItemId())) {
throw new TransactionException("Duplicate itemId: " + item.getItemId());
}
CollectionTxnRemoveOperation op = new CollectionTxnRemoveOperation(name, item.getItemId());
tx.addTransactionLog(new CollectionTransactionLog(
item.getItemId(),
name,
partitionId,
getServiceName(),
tx.getTxnId(),
op));
return true;
}
} catch (Throwable t) {
throw ExceptionUtil.rethrow(t);
}
return false;
}
public int size() {
checkTransactionState();
CollectionSizeOperation operation = new CollectionSizeOperation(name);
try {
Future f = getNodeEngine().getOperationService().invokeOnPartition(getServiceName(), operation, partitionId);
Integer size = f.get();
return size + getCollection().size();
} catch (Throwable t) {
throw ExceptionUtil.rethrow(t);
}
}
protected void checkTransactionState() {
if (!tx.getState().equals(Transaction.State.ACTIVE)) {
throw new TransactionNotActiveException("Transaction is not active!");
}
}
protected void throwExceptionIfNull(Object o) {
if (o == null) {
throw new NullPointerException("Object is null");
}
}
}
