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

protected Connection	connection
protected DataSource	dataSource
static long	DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL
protected Handler<Exception>	exceptionHandler
protected PreparedStatement	lockCreateStatement
protected PreparedStatement	lockUpdateStatement
protected int	queryTimeout
protected Statements	statements
protected boolean	stopping

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

failIfLocked, lockAcquireSleepInterval, name

Constructor Summary

DefaultDatabaseLocker()

Method Summary

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

DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL

public static final long DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL

See Also:

Constant Field Values

dataSource

protected DataSource dataSource

statements

protected Statements statements

lockCreateStatement

protected volatile PreparedStatement lockCreateStatement

lockUpdateStatement

protected volatile PreparedStatement lockUpdateStatement

connection

protected volatile Connection connection

stopping

protected volatile boolean stopping

exceptionHandler

protected Handler<Exception> exceptionHandler

queryTimeout

protected int queryTimeout

Constructor Detail

DefaultDatabaseLocker

public DefaultDatabaseLocker()

Method Detail

configure

public void configure(PersistenceAdapter adapter)
               throws 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:

IOException

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()

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)