/*
* Copyright 2015 Groupon, Inc
* Copyright 2015 The Billing Project, LLC
*
* The Billing Project licenses this file to you 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 org.killbill.commons.locker.postgresql;
import org.killbill.commons.locker.GlobalLock;
import org.killbill.commons.locker.GlobalLocker;
import org.killbill.commons.locker.GlobalLockerBase;
import org.killbill.commons.locker.ResetReentrantLockCallback;
import javax.sql.DataSource;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.sql.Connection;
import java.util.concurrent.TimeUnit;
public class PostgreSQLGlobalLocker extends GlobalLockerBase implements GlobalLocker {
public PostgreSQLGlobalLocker(final DataSource dataSource) {
this(dataSource, DEFAULT_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS);
}
public PostgreSQLGlobalLocker(final DataSource dataSource, final long timeout, final TimeUnit timeUnit) {
super(dataSource, new PostgreSQLGlobalLockDao(), timeout, timeUnit);
}
@Override
protected GlobalLock getGlobalLock(final Connection connection, final String lockName, final ResetReentrantLockCallback resetCb) {
return new PostgreSQLGlobalLock(connection, lockName, globalLockDao, resetCb);
}
protected String getLockName(final String service, final String lockKey) {
final String lockName = service + "-" + lockKey;
try {
final MessageDigest messageDigest = MessageDigest.getInstance("MD5");
final byte[] bytes = messageDigest.digest(lockName.getBytes());
return String.valueOf(ByteBuffer.wrap(bytes).getLong());
} catch (final NoSuchAlgorithmException e) {
logger.warn("Unable to allocate MessageDigest", e);
return String.valueOf(lockName.hashCode());
}
}
}