Package org.apache.activemq.broker

Class AbstractLocker

java.lang.Object

org.apache.activemq.util.ServiceSupport

org.apache.activemq.broker.AbstractLocker

All Implemented Interfaces:

Locker, org.apache.activemq.Service

Direct Known Subclasses:

SharedFileLocker

public abstract class AbstractLocker
extends org.apache.activemq.util.ServiceSupport
implements Locker

Field Summary

Fields

Modifier and Type	Field	Description
static final long	DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL
protected boolean	failIfLocked
protected LockableServiceSupport	lockable
protected long	lockAcquireSleepInterval
protected String	name

Constructor Summary

Constructors

Constructor	Description
AbstractLocker()

Method Summary

Modifier and Type	Method	Description
long	getLockAcquireSleepInterval()
boolean	keepAlive()	Used by a timer to keep alive the lock.
void	setFailIfLocked(boolean failIfLocked)	Specify whether to fail immediately if the lock is already held.
void	setLockable(LockableServiceSupport lockableServiceSupport)	A reference to what is locked
void	setLockAcquireSleepInterval(long lockAcquireSleepInterval)	set the delay interval in milliseconds between lock acquire attempts
void	setName(String name)	Set the name of the lock to use.

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

addServiceListener, dispose, doStart, doStop, 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.broker.Locker

configure

Methods inherited from interface org.apache.activemq.Service

start, stop

Field Details

DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL

public static final long DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL

See Also:

• Constant Field Values

name

protected String name

failIfLocked

protected boolean failIfLocked

lockAcquireSleepInterval

protected long lockAcquireSleepInterval

lockable

protected LockableServiceSupport lockable

Constructor Details

AbstractLocker

public AbstractLocker()

Method Details

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

Throws:

IOException

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

Parameters:

lockAcquireSleepInterval - the sleep interval in miliseconds

getLockAcquireSleepInterval

public long getLockAcquireSleepInterval()

setName

public void setName(String name)

Description copied from interface: Locker

Set the name of the lock to use.

Specified by:

setName in interface Locker

setFailIfLocked

public void setFailIfLocked(boolean failIfLocked)

Description copied from interface: Locker

Specify whether to fail immediately if the lock is already held. When set, the CustomLock must throw an IOException immediately upon detecting the lock is already held.

Specified by:

setFailIfLocked in interface Locker

Parameters:

failIfLocked - true => fail immediately if the lock is held; false => block until the lock can be obtained (default).

setLockable

public void setLockable(LockableServiceSupport lockableServiceSupport)

Description copied from interface: Locker

A reference to what is locked

Specified by:

setLockable in interface Locker