org.apache.activemq.store.jdbc

Class DefaultDatabaseLocker

java.lang.Object

org.apache.activemq.util.ServiceSupport

org.apache.activemq.broker.AbstractLocker

org.apache.activemq.store.jdbc.AbstractJDBCLocker

org.apache.activemq.store.jdbc.DefaultDatabaseLocker

All Implemented Interfaces:

Locker, Service

Direct Known Subclasses:

TransactDatabaseLocker

public class DefaultDatabaseLocker
extends AbstractJDBCLocker

Represents an exclusive lock on a database to avoid multiple brokers running against the same logical database.

Field Summary

Fields

Modifier and Type	Field and Description
protected Connection	connection
protected Handler<Exception>	exceptionHandler
protected PreparedStatement	lockCreateStatement
protected PreparedStatement	lockUpdateStatement

Fields inherited from class org.apache.activemq.store.jdbc.AbstractJDBCLocker

createTablesOnStartup, dataSource, jdbcAdapter, queryTimeout

Fields inherited from class org.apache.activemq.broker.AbstractLocker

DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL, failIfLocked, lockable, lockAcquireSleepInterval, name

Constructor Summary

Constructors

Constructor and Description
DefaultDatabaseLocker()

Method Summary

Methods

Modifier and Type	Method and Description
void	doStart()
void	doStop(ServiceStopper stopper)
Handler	getExceptionHandler()
long	getLockAcquireSleepInterval()
boolean	keepAlive() Used by a timer to keep alive the lock.
void	setExceptionHandler(Handler exceptionHandler)
void	setLockAcquireSleepInterval(long lockAcquireSleepInterval) set the delay interval in milliseconds between lock acquire attempts

Methods inherited from class org.apache.activemq.store.jdbc.AbstractJDBCLocker

close, close, configure, getConnection, getQueryTimeout, getStatements, preStart, setCreateTablesOnStartup, setDataSource, setQueryTimeout, setQueryTimeout, setStatements

Methods inherited from class org.apache.activemq.broker.AbstractLocker

setFailIfLocked, setLockable, setName

Methods inherited from class org.apache.activemq.util.ServiceSupport

addServiceListener, dispose, isStarted, isStopped, isStopping, postStop, removeServiceListener, start, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.activemq.Service

start, stop

Field Detail

lockCreateStatement

protected volatile PreparedStatement lockCreateStatement

lockUpdateStatement

protected volatile PreparedStatement lockUpdateStatement

connection

protected volatile Connection connection

exceptionHandler

protected Handler<Exception> exceptionHandler

Constructor Detail

DefaultDatabaseLocker

public DefaultDatabaseLocker()

Method Detail

doStart

public void doStart()
             throws Exception

Specified by:

doStart in class ServiceSupport

Throws:

Exception

doStop

public void doStop(ServiceStopper stopper)
            throws Exception

Specified by:

doStop in class ServiceSupport

Throws:

Exception

keepAlive

public boolean keepAlive()
                  throws IOException

Description copied from interface: Locker

Used by a timer to keep alive the lock. If the method returns false the broker should be terminated if an exception is thrown, the lock state cannot be determined

Specified by:

keepAlive in interface Locker

Overrides:

keepAlive in class AbstractLocker

Throws:

IOException

getLockAcquireSleepInterval

public long getLockAcquireSleepInterval()

Overrides:

getLockAcquireSleepInterval in class AbstractLocker

setLockAcquireSleepInterval

public void setLockAcquireSleepInterval(long lockAcquireSleepInterval)

Description copied from interface: Locker

set the delay interval in milliseconds between lock acquire attempts

Specified by:

setLockAcquireSleepInterval in interface Locker

Overrides:

setLockAcquireSleepInterval in class AbstractLocker

Parameters:

lockAcquireSleepInterval - the sleep interval in miliseconds

getExceptionHandler

public Handler getExceptionHandler()

setExceptionHandler

public void setExceptionHandler(Handler exceptionHandler)