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

Class Locker

java.lang.Object

org.apache.curator.framework.recipes.locks.Locker

All Implemented Interfaces:

AutoCloseable

public class Locker
extends Object
implements AutoCloseable

Utility for safely acquiring a lock and releasing it using Java 7's try-with-resource feature.

Canonical usage:

     InterProcessMutex mutex = new InterProcessMutex(...) // or any InterProcessLock
     try ( Locker locker = new Locker(mutex, maxTimeout, unit) )
     {
         // do work
     }
 

Constructor Summary

Constructors

Constructor	Description
Locker(InterProcessLock lock)
Locker(InterProcessLock lock, long timeout, TimeUnit unit)

Method Summary

Modifier and Type	Method	Description
protected void	acquireLock(InterProcessLock lock)
protected boolean	acquireLock(InterProcessLock lock, long timeout, TimeUnit unit)
void	close()
protected void	releaseLock()

Methods inherited from class java.lang.Object

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

Constructor Details

Locker

public Locker(InterProcessLock lock,
 long timeout,
 TimeUnit unit)
       throws Exception

Parameters:

lock - a lock implementation (e.g. InterProcessMutex, InterProcessSemaphoreV2, etc.)

timeout - max timeout to acquire lock

unit - time unit of timeout

Throws:

Exception - Curator errors or TimeoutException if the lock cannot be acquired within the timeout

Locker

public Locker(InterProcessLock lock)
       throws Exception

Parameters:

lock - a lock implementation (e.g. InterProcessMutex, InterProcessSemaphoreV2, etc.)

Throws:

Exception - errors

Method Details

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception

releaseLock

protected void releaseLock()
                    throws Exception

Throws:

Exception

acquireLock

protected void acquireLock(InterProcessLock lock)
                    throws Exception

Throws:

Exception

acquireLock

protected boolean acquireLock(InterProcessLock lock,
 long timeout,
 TimeUnit unit)
                       throws Exception

Throws:

Exception