/*
* 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.map.impl.tx;
import com.hazelcast.map.impl.MapDataSerializerHook;
import com.hazelcast.map.impl.operation.LockAwareOperation;
import com.hazelcast.map.impl.record.Record;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.spi.impl.MutatingOperation;
import com.hazelcast.transaction.TransactionException;
import java.io.IOException;
/**
* Transactional lock and get operation.
*/
public class TxnLockAndGetOperation extends LockAwareOperation implements MutatingOperation {
private VersionedValue response;
private String ownerUuid;
private boolean shouldLoad;
private boolean blockReads;
public TxnLockAndGetOperation() {
}
public TxnLockAndGetOperation(String name, Data dataKey, long timeout, long ttl, String ownerUuid,
boolean shouldLoad, boolean blockReads) {
super(name, dataKey, ttl);
this.ownerUuid = ownerUuid;
this.shouldLoad = shouldLoad;
this.blockReads = blockReads;
setWaitTimeout(timeout);
}
@Override
public void run() throws Exception {
if (!recordStore.txnLock(getKey(), ownerUuid, getThreadId(), getCallId(), ttl, blockReads)) {
throw new TransactionException("Transaction couldn't obtain lock.");
}
Record record = recordStore.getRecordOrNull(dataKey);
if (record == null && shouldLoad) {
record = recordStore.loadRecordOrNull(dataKey, false);
}
Data value = record == null ? null : mapServiceContext.toData(record.getValue());
response = new VersionedValue(value, record == null ? 0 : record.getVersion());
}
public boolean shouldWait() {
return !recordStore.canAcquireLock(dataKey, ownerUuid, getThreadId());
}
@Override
public void onWaitExpire() {
sendResponse(null);
}
@Override
public Object getResponse() {
return response;
}
@Override
protected void writeInternal(ObjectDataOutput out) throws IOException {
super.writeInternal(out);
out.writeUTF(ownerUuid);
out.writeBoolean(shouldLoad);
out.writeBoolean(blockReads);
}
@Override
protected void readInternal(ObjectDataInput in) throws IOException {
super.readInternal(in);
ownerUuid = in.readUTF();
shouldLoad = in.readBoolean();
blockReads = in.readBoolean();
}
@Override
protected void toString(StringBuilder sb) {
super.toString(sb);
sb.append(", thread=").append(getThreadId());
}
@Override
public int getId() {
return MapDataSerializerHook.TXN_LOCK_AND_GET;
}
}