Package org.apache.curator.framework.recipes.locks

Class InterProcessMultiLock

java.lang.Object

org.apache.curator.framework.recipes.locks.InterProcessMultiLock

All Implemented Interfaces:

InterProcessLock

public class InterProcessMultiLock
extends Object
implements InterProcessLock

A container that manages multiple locks as a single entity. When acquire() is called, all the locks are acquired. If that fails, any paths that were acquired are released. Similarly, when release() is called, all locks are released (failures are ignored).

Constructor Summary

Constructors

Constructor	Description
InterProcessMultiLock(List<InterProcessLock> locks)	Creates a multi lock of any type of inter process lock
InterProcessMultiLock(CuratorFramework client, List<String> paths)	Creates a multi lock of InterProcessMutexs

Method Summary

Modifier and Type	Method	Description
void	acquire()	Acquire the mutex - blocking until it's available.
boolean	acquire(long time, TimeUnit unit)	Acquire the mutex - blocks until it's available or the given time expires.
boolean	isAcquiredInThisProcess()	Returns true if the mutex is acquired by a thread in this JVM
void	release()	Perform one release of the mutex.

Methods inherited from class java.lang.Object

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

Constructor Detail

InterProcessMultiLock

public InterProcessMultiLock(CuratorFramework client,
                             List<String> paths)

Creates a multi lock of InterProcessMutexs

Parameters:

client - the client

paths - list of paths to manage in the order that they are to be locked

InterProcessMultiLock

public InterProcessMultiLock(List<InterProcessLock> locks)

Creates a multi lock of any type of inter process lock

Parameters:

locks - the locks

Method Detail

acquire

public void acquire()
             throws Exception

Acquire the mutex - blocking until it's available. Each call to acquire must be balanced by a call to InterProcessLock.release()

Specified by:

acquire in interface InterProcessLock

Throws:

Exception - ZK errors, connection interruptions

acquire

public boolean acquire(long time,
                       TimeUnit unit)
                throws Exception

Acquire the mutex - blocks until it's available or the given time expires. Each call to acquire that returns true must be balanced by a call to InterProcessLock.release()

Specified by:

acquire in interface InterProcessLock

Parameters:

time - time to wait

unit - time unit

Returns:

true if the mutex was acquired, false if not

Throws:

Exception - ZK errors, connection interruptions

release

public void release()
             throws Exception

Perform one release of the mutex.

NOTE: locks are released in the reverse order that they were acquired.

Specified by:

release in interface InterProcessLock

Throws:

Exception - ZK errors, interruptions, current thread does not own the lock

isAcquiredInThisProcess

public boolean isAcquiredInThisProcess()

Description copied from interface: InterProcessLock

Returns true if the mutex is acquired by a thread in this JVM

Specified by:

isAcquiredInThisProcess in interface InterProcessLock

Returns:

true/false