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/*-
* ============LICENSE_START=======================================================
* ONAP : APPC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2017 Amdocs
* =============================================================================
* 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.
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
* ============LICENSE_END=========================================================
*/
package org.openecomp.appc.lockmanager.impl.sql.pessimistic;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.openecomp.appc.lockmanager.api.LockRuntimeException;
public class MySqlLockManager extends SqlLockManager {
private static final int DEF_CRITICAL_SECTION_WAIT_TIMEOUT = 3;
protected int criticalSectionWaitTimeoutSecs = DEF_CRITICAL_SECTION_WAIT_TIMEOUT;
public void setCriticalSectionWaitTimeoutSecs(int criticalSectionWaitTimeoutSecs) {
this.criticalSectionWaitTimeoutSecs = criticalSectionWaitTimeoutSecs;
}
@Override
protected void enterCriticalSection(Connection connection, String resource) {
try {
CallableStatement statement = connection.prepareCall("SELECT COALESCE(GET_LOCK(?,?),0)");
try {
statement.setString(1, resource);
statement.setInt(2, criticalSectionWaitTimeoutSecs);
boolean execRes = statement.execute();
int result = 0;
if(execRes) {
ResultSet resultSet = statement.getResultSet();
try {
if(resultSet.next()) {
result = resultSet.getInt(1);
}
} finally {
resultSet.close();
}
}
if(result != 1) { // lock is not obtained
throw new LockRuntimeException("Cannot obtain critical section lock for resource [" + resource + "].");
}
} finally {
statement.close();
}
} catch(SQLException e) {
throw new LockRuntimeException("Cannot obtain critical section lock for resource [" + resource + "].", e);
}
}
@Override
protected void leaveCriticalSection(Connection connection, String resource) {
try {
CallableStatement statement = connection.prepareCall("SELECT RELEASE_LOCK(?)");
try {
statement.setString(1, resource);
statement.execute();
} finally {
statement.close();
}
} catch(SQLException e) {
throw new LockRuntimeException("Error releasing critical section lock.", e);
}
}
}
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