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.DefaultDatabaseLocker

All Implemented Interfaces:

Locker, Service

Direct Known Subclasses:

TransactDatabaseLocker

public class DefaultDatabaseLocker
extends AbstractLocker

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 java.sql.Connection	connection
protected javax.sql.DataSource	dataSource
protected Handler<java.lang.Exception>	exceptionHandler
protected java.sql.PreparedStatement	lockCreateStatement
protected java.sql.PreparedStatement	lockUpdateStatement
protected int	queryTimeout
protected Statements	statements
protected boolean	stopping

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

DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL, failIfLocked, lockAcquireSleepInterval, name

Constructor Summary

Constructors

Constructor and Description
DefaultDatabaseLocker()

Method Summary

Methods

Modifier and Type	Method and Description
void	configure(PersistenceAdapter adapter) Optionally configure the locker with the persistence adapter currently used You can use persistence adapter configuration details like, data directory datasource, etc.
void	doStart()
void	doStop(ServiceStopper stopper)
Handler	getExceptionHandler()
long	getLockAcquireSleepInterval()
int	getQueryTimeout()
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
void	setQueryTimeout(int queryTimeout)

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

setFailIfLocked, setName

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

addServiceListener, dispose, isStarted, isStopped, isStopping, postStop, preStart, 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

dataSource

protected javax.sql.DataSource dataSource

statements

protected Statements statements

lockCreateStatement

protected volatile java.sql.PreparedStatement lockCreateStatement

lockUpdateStatement

protected volatile java.sql.PreparedStatement lockUpdateStatement

connection

protected volatile java.sql.Connection connection

stopping

protected volatile boolean stopping

exceptionHandler

protected Handler<java.lang.Exception> exceptionHandler

queryTimeout

protected int queryTimeout

Constructor Detail

DefaultDatabaseLocker

public DefaultDatabaseLocker()

Method Detail

configure

public void configure(PersistenceAdapter adapter)
               throws java.io.IOException

Description copied from interface: Locker

Optionally configure the locker with the persistence adapter currently used You can use persistence adapter configuration details like, data directory datasource, etc. to be used by the locker

Throws:

java.io.IOException

doStart

public void doStart()
             throws java.lang.Exception

Specified by:

doStart in class ServiceSupport

Throws:

java.lang.Exception

doStop

public void doStop(ServiceStopper stopper)
            throws java.lang.Exception

Specified by:

doStop in class ServiceSupport

Throws:

java.lang.Exception

keepAlive

public boolean keepAlive()
                  throws java.io.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:

java.io.IOException

getLockAcquireSleepInterval

public long getLockAcquireSleepInterval()

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)

getQueryTimeout

public int getQueryTimeout()

setQueryTimeout

public void setQueryTimeout(int queryTimeout)