org.springframework.integration.zookeeper.lock

Class ZookeeperLockRegistry

java.lang.Object

org.springframework.integration.zookeeper.lock.ZookeeperLockRegistry

All Implemented Interfaces:

org.springframework.beans.factory.DisposableBean, ExpirableLockRegistry, LockRegistry

public class ZookeeperLockRegistry
extends java.lang.Object
implements ExpirableLockRegistry, org.springframework.beans.factory.DisposableBean

ExpirableLockRegistry implementation using Zookeeper, or more specifically, Curator InterProcessMutex.

Since:

4.2

Author:

Gary Russell, Artem Bilan

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ZookeeperLockRegistry.KeyToPathStrategy Strategy to convert a lock key (e.g.

Constructor Summary

Constructors

Constructor and Description
ZookeeperLockRegistry(org.apache.curator.framework.CuratorFramework client) Construct a lock registry using the default ZookeeperLockRegistry.KeyToPathStrategy which simple appends the key to '/SpringIntegration-LockRegistry/'.
ZookeeperLockRegistry(org.apache.curator.framework.CuratorFramework client, java.lang.String root) Construct a lock registry using the default ZookeeperLockRegistry.KeyToPathStrategy which simple appends the key to '<root>/'.
ZookeeperLockRegistry(org.apache.curator.framework.CuratorFramework client, ZookeeperLockRegistry.KeyToPathStrategy keyToPath) Construct a lock registry using the supplied ZookeeperLockRegistry.KeyToPathStrategy.

Method Summary

Modifier and Type	Method and Description
void	destroy()
void	expireUnusedOlderThan(long age) Remove locks last acquired more than 'age' ago that are not currently locked.
java.util.concurrent.locks.Lock	obtain(java.lang.Object lockKey) Obtains the lock associated with the parameter object.
void	setMutexTaskExecutor(org.springframework.core.task.AsyncTaskExecutor mutexTaskExecutor) Set an AsyncTaskExecutor to use when establishing (and testing) the connection with Zookeeper.

Methods inherited from class java.lang.Object

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

Constructor Detail

ZookeeperLockRegistry

public ZookeeperLockRegistry(org.apache.curator.framework.CuratorFramework client)

Construct a lock registry using the default ZookeeperLockRegistry.KeyToPathStrategy which simple appends the key to '/SpringIntegration-LockRegistry/'.

Parameters:

client - the CuratorFramework.

ZookeeperLockRegistry

public ZookeeperLockRegistry(org.apache.curator.framework.CuratorFramework client,
                             java.lang.String root)

Construct a lock registry using the default ZookeeperLockRegistry.KeyToPathStrategy which simple appends the key to '<root>/'.

Parameters:

client - the CuratorFramework.

root - the path root (no trailing /).

ZookeeperLockRegistry

public ZookeeperLockRegistry(org.apache.curator.framework.CuratorFramework client,
                             ZookeeperLockRegistry.KeyToPathStrategy keyToPath)

Construct a lock registry using the supplied ZookeeperLockRegistry.KeyToPathStrategy.

Parameters:

client - the CuratorFramework.

keyToPath - the implementation of ZookeeperLockRegistry.KeyToPathStrategy.

Method Detail

setMutexTaskExecutor

public void setMutexTaskExecutor(org.springframework.core.task.AsyncTaskExecutor mutexTaskExecutor)

Set an AsyncTaskExecutor to use when establishing (and testing) the connection with Zookeeper. This must be performed asynchronously so the Lock.tryLock(long, TimeUnit) contract can be honored. While an executor is used internally, an external executor may be required in some environments, for example those that require the use of a WorkManagerTaskExecutor.

Parameters:

mutexTaskExecutor - the executor.

Since:

4.2.10

obtain

public java.util.concurrent.locks.Lock obtain(java.lang.Object lockKey)

Description copied from interface: LockRegistry

Obtains the lock associated with the parameter object.

Specified by:

obtain in interface LockRegistry

Parameters:

lockKey - The object with which the lock is associated.

Returns:

The associated lock.

expireUnusedOlderThan

public void expireUnusedOlderThan(long age)

Remove locks last acquired more than 'age' ago that are not currently locked. Expiry is not supported if the ZookeeperLockRegistry.KeyToPathStrategy is bounded (returns a finite number of paths). With such a ZookeeperLockRegistry.KeyToPathStrategy, the overhead of tracking when a lock is obtained is avoided.

Specified by:

expireUnusedOlderThan in interface ExpirableLockRegistry

Parameters:

age - the time since the lock was last obtained.

destroy

public void destroy()
             throws java.lang.Exception

Specified by:

destroy in interface org.springframework.beans.factory.DisposableBean

Throws:

java.lang.Exception