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/*
* ============LICENSE_START=======================================================
* feature-distributed-locking
* ================================================================================
* Copyright (C) 2018 AT&T Intellectual Property. 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.distributed.locking;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.UUID;
import java.util.concurrent.CountDownLatch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* This runnable class scans the locks table for all locks owned by this host.
* It refreshes the expiration time of each lock using the locking.distributed.aging
* property
*
*/
public class Heartbeat implements Runnable{
private static final Logger logger = LoggerFactory.getLogger(Heartbeat.class);
/**
* Properties object containing properties needed by class
*/
private DistributedLockingProperties lockProps;
/**
* UUID
*/
private UUID uuid;
/**
* Countdown latch for testing
*/
private volatile CountDownLatch latch;
/**
*
* @param uuid
* @param lockProps
*/
public Heartbeat(UUID uuid, DistributedLockingProperties lockProps) {
this.lockProps = lockProps;
this.uuid = uuid;
this.latch = new CountDownLatch(1);
}
/**
*
* @param latch
* Used for testing purposes
*/
protected void giveLatch(CountDownLatch latch) {
this.latch = latch;
}
@Override
public void run() {
long expirationAge = lockProps.getAgingProperty();
try (Connection conn = DriverManager.getConnection(lockProps.getDbUrl(), lockProps.getDbUser(),
lockProps.getDbPwd());
PreparedStatement statement = conn
.prepareStatement("UPDATE pooling.locks SET expirationTime = ? WHERE host = ?");) {
statement.setLong(1, System.currentTimeMillis() + expirationAge);
statement.setString(2, this.uuid.toString());
statement.executeUpdate();
latch.countDown();
} catch (SQLException e) {
logger.error("error in Heartbeat.run()", e);
}
}
}
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