org.apache.commons.configuration2.sync

Class ReadWriteSynchronizer

java.lang.Object

org.apache.commons.configuration2.sync.ReadWriteSynchronizer

All Implemented Interfaces:

Synchronizer

public class ReadWriteSynchronizer
extends Object
implements Synchronizer

A special implementation of Synchronizer based on the JDK's ReentrantReadWriteLock class.

This class manages a ReadWriteLock object internally. The methods of the Synchronizer interface are delegated to this lock. So this class behaves in the same way as documented for ReentrantReadWriteLock.

Using this Synchronizer implementation is appropriate to make configuration objects thread-safe. This means that multiple threads can read configuration data in parallel; if one thread wants to update the configuration, this happens with an exclusive lock.

Since:

2.0

Constructor Summary

Constructors

Constructor and Description
ReadWriteSynchronizer() Creates a new instance of ReadWriteSynchronizer and initializes it with a lock object of type ReentrantReadWriteLock.
ReadWriteSynchronizer(ReadWriteLock l) Creates a new instance of ReadWriteSynchronizer and initializes it with the given lock object.

Method Summary

Modifier and Type	Method and Description
void	beginRead() Notifies this Synchronizer that the current thread is going to start a read operation on the managed configuration.
void	beginWrite() Notifies this Synchronizer that the current thread is going to start a write operation on the managed configuration.
void	endRead() Notifies this Synchronizer that the current thread has finished its read operation.
void	endWrite() Notifies this Synchronizer that the current thread has finished its write operation.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReadWriteSynchronizer

public ReadWriteSynchronizer(ReadWriteLock l)

Creates a new instance of ReadWriteSynchronizer and initializes it with the given lock object. This constructor can be used to pass a lock object which has been configured externally. If the lock object is null, a default lock object is created.

Parameters:

l - the lock object to be used (can be null)

ReadWriteSynchronizer

public ReadWriteSynchronizer()

Creates a new instance of ReadWriteSynchronizer and initializes it with a lock object of type ReentrantReadWriteLock.

Method Detail

beginRead

public void beginRead()

Description copied from interface: Synchronizer

Notifies this Synchronizer that the current thread is going to start a read operation on the managed configuration. This call can block if a concrete implementation decides that the thread has to wait until a specific condition is fulfilled.

Specified by:

beginRead in interface Synchronizer

endRead

public void endRead()

Description copied from interface: Synchronizer

Notifies this Synchronizer that the current thread has finished its read operation. This may cause other waiting threads to be granted access to the managed configuration.

Specified by:

endRead in interface Synchronizer

beginWrite

public void beginWrite()

Description copied from interface: Synchronizer

Notifies this Synchronizer that the current thread is going to start a write operation on the managed configuration. This call may block. For instance, a concrete implementation may suspend the thread until all read operations currently active are finished,

Specified by:

beginWrite in interface Synchronizer

endWrite

public void endWrite()

Description copied from interface: Synchronizer

Notifies this Synchronizer that the current thread has finished its write operation. This may cause other waiting threads to be granted access to the managed configuration.

Specified by:

endWrite in interface Synchronizer