/*
Derby - Class org.apache.derby.impl.sql.execute.LockTableConstantAction
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF 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.apache.derby.impl.sql.execute;
import org.apache.derby.iapi.services.sanity.SanityManager;
import org.apache.derby.iapi.sql.execute.ConstantAction;
import org.apache.derby.iapi.reference.SQLState;
import org.apache.derby.iapi.sql.Activation;
import org.apache.derby.iapi.error.StandardException;
import org.apache.derby.iapi.store.access.ConglomerateController;
import org.apache.derby.iapi.store.access.TransactionController;
import org.apache.derby.catalog.UUID;
/**
* This class describes actions that are ALWAYS performed for a
* LOCK TABLE Statement at Execution time.
*
*/
class LockTableConstantAction implements ConstantAction
{
private final String fullTableName;
private final long conglomerateNumber;
private final boolean exclusiveMode;
// CONSTRUCTORS
/**
* Make the ConstantAction for a LOCK TABLE statement.
*
* @param fullTableName Full name of the table.
* @param conglomerateNumber Conglomerate number for the heap
* @param exclusiveMode Whether or not to get an exclusive lock.
*/
LockTableConstantAction(String fullTableName,
long conglomerateNumber, boolean exclusiveMode)
{
this.fullTableName = fullTableName;
this.conglomerateNumber = conglomerateNumber;
this.exclusiveMode = exclusiveMode;
}
// OBJECT METHODS
public String toString()
{
// Do not put this under SanityManager.DEBUG - it is needed for
// error reporting.
return "LOCK TABLE " + fullTableName;
}
// INTERFACE METHODS
/**
* This is the guts of the Execution-time logic for LOCK TABLE.
*
* @see ConstantAction#executeConstantAction
*
* @exception StandardException Thrown on failure
*/
public void executeConstantAction( Activation activation )
throws StandardException
{
ConglomerateController cc;
TransactionController tc;
/* Get a ConglomerateController for the base conglomerate */
tc = activation.getTransactionController();
try
{
cc = tc.openConglomerate(
conglomerateNumber,
false,
(exclusiveMode) ?
(TransactionController.OPENMODE_FORUPDATE |
TransactionController.OPENMODE_FOR_LOCK_ONLY) :
TransactionController.OPENMODE_FOR_LOCK_ONLY,
TransactionController.MODE_TABLE,
TransactionController.ISOLATION_SERIALIZABLE);
cc.close();
}
catch (StandardException se)
{
String msgId = se.getMessageId();
if (msgId.equals(SQLState.DEADLOCK) || msgId.equals(SQLState.LOCK_TIMEOUT) || msgId.equals(SQLState.LOCK_TIMEOUT_LOG)) {
String mode = (exclusiveMode) ? "EXCLUSIVE" : "SHARE";
se = StandardException.newException(SQLState.LANG_CANT_LOCK_TABLE, se, fullTableName, mode);
}
throw se;
}
}
}