org.apache.activemq.store
Class SharedFileLocker

java.lang.Object
  org.apache.activemq.util.ServiceSupport
      org.apache.activemq.broker.AbstractLocker
          org.apache.activemq.store.SharedFileLocker

All Implemented Interfaces:

Locker, Service

public class SharedFileLocker
extends AbstractLocker

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

Field Summary

static File	DEFAULT_DIRECTORY
protected File	directory

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

DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL, failIfLocked, lockable, lockAcquireSleepInterval, name

Constructor Summary

SharedFileLocker()

Method Summary

void	configure(PersistenceAdapter persistenceAdapter) 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)
File	getDirectory()
boolean	keepAlive() Used by a timer to keep alive the lock.
void	setDirectory(File directory)

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

getLockAcquireSleepInterval, setFailIfLocked, setLockable, setLockAcquireSleepInterval, 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_DIRECTORY

public static final File DEFAULT_DIRECTORY

directory

protected File directory

Constructor Detail

SharedFileLocker

public SharedFileLocker()

Method Detail

doStart

public void doStart()
             throws Exception

Specified by:

doStart in class ServiceSupport

Throws:

Exception

keepAlive

public boolean keepAlive()

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

doStop

public void doStop(ServiceStopper stopper)
            throws Exception

Specified by:

doStop in class ServiceSupport

Throws:

Exception

getDirectory

public File getDirectory()

setDirectory

public void setDirectory(File directory)

configure

public void configure(PersistenceAdapter persistenceAdapter)
               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