org.ow2.chameleon.core.activators

Class DirectoryMonitor

java.lang.Object

org.ow2.chameleon.core.activators.DirectoryMonitor

All Implemented Interfaces:

org.osgi.framework.BundleActivator, org.osgi.util.tracker.ServiceTrackerCustomizer

public class DirectoryMonitor
extends Object
implements org.osgi.framework.BundleActivator, org.osgi.util.tracker.ServiceTrackerCustomizer

Monitors a directory. It tracks all deployer services exposed in the framework and delegate the file events to the adequate deployer.

Field Summary

Fields

Modifier and Type	Field and Description
protected List<Deployer>	deployers List of deployers
protected org.slf4j.Logger	logger A logger.

Constructor Summary

Constructors

Constructor and Description
DirectoryMonitor(File directory)
DirectoryMonitor(File directory, long polling)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	acquireReadLockIfNotHeld() Acquires the read lock only and only if no read lock is already held by the current thread.
boolean	acquireWriteLockIfNotHeld() Acquires the write lock only and only if the write lock is not already held by the current thread.
Object	addingService(org.osgi.framework.ServiceReference reference)
void	modifiedService(org.osgi.framework.ServiceReference reference, Object o)
boolean	releaseReadLockIfHeld() Releases the read lock only and only if the read lock is held by the current thread.
boolean	releaseWriteLockIfHeld() Releases the write lock only and only if the write lock is held by the current thread.
void	removedService(org.osgi.framework.ServiceReference reference, Object o)
void	start(org.osgi.framework.BundleContext context)
void	stop(org.osgi.framework.BundleContext context)

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final org.slf4j.Logger logger

A logger.

deployers

protected final List<Deployer> deployers

List of deployers

Constructor Detail

DirectoryMonitor

public DirectoryMonitor(File directory,
                long polling)

DirectoryMonitor

public DirectoryMonitor(File directory)

Method Detail

acquireWriteLockIfNotHeld

public boolean acquireWriteLockIfNotHeld()

Acquires the write lock only and only if the write lock is not already held by the current thread.

Returns:

true if the lock was acquired within the method, false otherwise.

releaseWriteLockIfHeld

public boolean releaseWriteLockIfHeld()

Releases the write lock only and only if the write lock is held by the current thread.

Returns:

true if the lock has no more holders, false otherwise.

acquireReadLockIfNotHeld

public boolean acquireReadLockIfNotHeld()

Acquires the read lock only and only if no read lock is already held by the current thread.

Returns:

true if the lock was acquired within the method, false otherwise.

releaseReadLockIfHeld

public boolean releaseReadLockIfHeld()

Releases the read lock only and only if the read lock is held by the current thread.

Returns:

true if the lock has no more holders, false otherwise.

start

public void start(org.osgi.framework.BundleContext context)
           throws Exception

Specified by:

start in interface org.osgi.framework.BundleActivator

Throws:

Exception

stop

public void stop(org.osgi.framework.BundleContext context)
          throws Exception

Specified by:

stop in interface org.osgi.framework.BundleActivator

Throws:

Exception

addingService

public Object addingService(org.osgi.framework.ServiceReference reference)

Specified by:

addingService in interface org.osgi.util.tracker.ServiceTrackerCustomizer

modifiedService

public void modifiedService(org.osgi.framework.ServiceReference reference,
                   Object o)

Specified by:

modifiedService in interface org.osgi.util.tracker.ServiceTrackerCustomizer

removedService

public void removedService(org.osgi.framework.ServiceReference reference,
                  Object o)

Specified by:

removedService in interface org.osgi.util.tracker.ServiceTrackerCustomizer