/*
* 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.collection.impl.txncollection;
import com.hazelcast.collection.impl.collection.CollectionItem;
import com.hazelcast.collection.impl.collection.operations.CollectionSizeOperation;
import com.hazelcast.collection.impl.txncollection.operations.CollectionReserveAddOperation;
import com.hazelcast.collection.impl.txncollection.operations.CollectionReserveRemoveOperation;
import com.hazelcast.collection.impl.txncollection.operations.CollectionTxnAddOperation;
import com.hazelcast.collection.impl.txncollection.operations.CollectionTxnRemoveOperation;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.OperationService;
import com.hazelcast.spi.RemoteService;
import com.hazelcast.spi.TransactionalDistributedObject;
import com.hazelcast.transaction.TransactionException;
import com.hazelcast.transaction.TransactionNotActiveException;
import com.hazelcast.transaction.impl.Transaction;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.Future;
import static com.hazelcast.util.ExceptionUtil.rethrow;
import static com.hazelcast.util.Preconditions.checkNotNull;
public abstract class AbstractTransactionalCollectionProxy<S extends RemoteService, E>
extends TransactionalDistributedObject<S> {
protected final Set<Long> itemIdSet = new HashSet<Long>();
protected final String name;
protected final int partitionId;
protected final OperationService operationService;
public AbstractTransactionalCollectionProxy(String name, Transaction tx, NodeEngine nodeEngine, S service) {
super(nodeEngine, service, tx);
this.name = name;
this.partitionId = nodeEngine.getPartitionService().getPartitionId(getNameAsPartitionAwareData());
this.operationService = nodeEngine.getOperationService();
}
protected abstract Collection<CollectionItem> getCollection();
@Override
public String getName() {
return name;
}
public boolean add(E e) {
checkTransactionActive();
checkObjectNotNull(e);
Data value = getNodeEngine().toData(e);
CollectionReserveAddOperation operation = new CollectionReserveAddOperation(name, tx.getTxnId(), null);
try {
Future<Long> future = operationService.invokeOnPartition(getServiceName(), operation, partitionId);
Long itemId = future.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);
putToRecord(op);
return true;
}
} catch (Throwable t) {
throw rethrow(t);
}
return false;
}
protected void putToRecord(CollectionTxnOperation operation) {
CollectionTransactionLogRecord logRecord = (CollectionTransactionLogRecord) tx.get(name);
if (logRecord == null) {
logRecord = new CollectionTransactionLogRecord(getServiceName(), tx.getTxnId(), name, partitionId);
tx.add(logRecord);
}
logRecord.addOperation(operation);
}
private void removeFromRecord(long itemId) {
CollectionTransactionLogRecord logRecord = (CollectionTransactionLogRecord) tx.get(name);
int size = logRecord.removeOperation(itemId);
if (size == 0) {
tx.remove(name);
}
}
public boolean remove(E e) {
checkTransactionActive();
checkObjectNotNull(e);
Data value = getNodeEngine().toData(e);
Iterator<CollectionItem> iterator = getCollection().iterator();
long reservedItemId = -1;
while (iterator.hasNext()) {
CollectionItem item = iterator.next();
if (value.equals(item.getValue())) {
reservedItemId = item.getItemId();
break;
}
}
CollectionReserveRemoveOperation operation = new CollectionReserveRemoveOperation(
name, reservedItemId, value, tx.getTxnId());
try {
Future<CollectionItem> future = operationService.invokeOnPartition(getServiceName(), operation, partitionId);
CollectionItem item = future.get();
if (item != null) {
if (reservedItemId == item.getItemId()) {
iterator.remove();
removeFromRecord(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());
putToRecord(op);
return true;
}
} catch (Throwable t) {
throw rethrow(t);
}
return false;
}
public int size() {
checkTransactionActive();
try {
CollectionSizeOperation operation = new CollectionSizeOperation(name);
Future<Integer> future = operationService.invokeOnPartition(getServiceName(), operation, partitionId);
Integer size = future.get();
return size + getCollection().size();
} catch (Throwable t) {
throw rethrow(t);
}
}
protected void checkTransactionActive() {
if (!tx.getState().equals(Transaction.State.ACTIVE)) {
throw new TransactionNotActiveException("Transaction is not active!");
}
}
protected void checkObjectNotNull(Object o) {
checkNotNull(o, "Object is null");
}
}