org.apache.accumulo.core.zookeeper
Class ZooLock

java.lang.Object
  org.apache.accumulo.core.zookeeper.ZooLock

All Implemented Interfaces:

org.apache.zookeeper.Watcher

public class ZooLock
extends java.lang.Object
implements org.apache.zookeeper.Watcher

Nested Class Summary

static interface	ZooLock.AsyncLockWatcher
static class	ZooLock.LockID
static class	ZooLock.LockLossReason
static interface	ZooLock.LockWatcher

Nested classes/interfaces inherited from interface org.apache.zookeeper.Watcher

org.apache.zookeeper.Watcher.Event

Field Summary

static java.lang.String

LOCK_PREFIX

Constructor Summary

ZooLock(java.lang.String path)

Method Summary

static void	deleteLock(java.lang.String path)
static boolean	deleteLock(java.lang.String path, java.lang.String lockData)
static byte[]	getLockData(java.lang.String path)
static byte[]	getLockData(ZooCache zc, java.lang.String path)
static byte[]	getLockData(org.apache.zookeeper.ZooKeeper zk, java.lang.String path)
ZooLock.LockID	getLockID()
java.lang.String	getLockName()
java.lang.String	getLockPath()
long	getSessionId()
static long	getSessionId(ZooCache zc, java.lang.String path)
boolean	isLocked()
static boolean	isLockHeld(ZooCache zc, ZooLock.LockID lid)
static boolean	isLockHeld(org.apache.zookeeper.ZooKeeper zk, ZooLock.LockID lid)
void	lockAsync(ZooLock.AsyncLockWatcher lw, byte[] data)
static void	main(java.lang.String[] args)
void	process(org.apache.zookeeper.WatchedEvent event)
boolean	tryLock(ZooLock.LockWatcher lw, byte[] data)
boolean	tryToCancelAsyncLockOrUnlock()
void	unlock()
boolean	wasLockAcquired() indicates if the lock was acquired in the past....

Methods inherited from class java.lang.Object

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

Field Detail

LOCK_PREFIX

public static final java.lang.String LOCK_PREFIX

See Also:

Constant Field Values

Constructor Detail

ZooLock

public ZooLock(java.lang.String path)

Method Detail

tryLock

public boolean tryLock(ZooLock.LockWatcher lw,
                       byte[] data)
                throws org.apache.zookeeper.KeeperException,
                       java.lang.InterruptedException

Throws:

org.apache.zookeeper.KeeperException

java.lang.InterruptedException

lockAsync

public void lockAsync(ZooLock.AsyncLockWatcher lw,
                      byte[] data)

tryToCancelAsyncLockOrUnlock

public boolean tryToCancelAsyncLockOrUnlock()
                                     throws java.lang.InterruptedException,
                                            org.apache.zookeeper.KeeperException

Throws:

java.lang.InterruptedException

org.apache.zookeeper.KeeperException

unlock

public void unlock()
            throws java.lang.InterruptedException,
                   org.apache.zookeeper.KeeperException

Throws:

java.lang.InterruptedException

org.apache.zookeeper.KeeperException

getLockPath

public java.lang.String getLockPath()

getLockName

public java.lang.String getLockName()

getLockID

public ZooLock.LockID getLockID()

wasLockAcquired

public boolean wasLockAcquired()

indicates if the lock was acquired in the past.... helps discriminate between the case where the lock was never held, or held and lost....

Returns:

isLocked

public boolean isLocked()

process

public void process(org.apache.zookeeper.WatchedEvent event)

Specified by:

process in interface org.apache.zookeeper.Watcher

isLockHeld

public static boolean isLockHeld(org.apache.zookeeper.ZooKeeper zk,
                                 ZooLock.LockID lid)
                          throws org.apache.zookeeper.KeeperException,
                                 java.lang.InterruptedException

Throws:

org.apache.zookeeper.KeeperException

java.lang.InterruptedException

isLockHeld

public static boolean isLockHeld(ZooCache zc,
                                 ZooLock.LockID lid)

getLockData

public static byte[] getLockData(org.apache.zookeeper.ZooKeeper zk,
                                 java.lang.String path)
                          throws org.apache.zookeeper.KeeperException,
                                 java.lang.InterruptedException

Throws:

org.apache.zookeeper.KeeperException

java.lang.InterruptedException

getLockData

public static byte[] getLockData(ZooCache zc,
                                 java.lang.String path)

getLockData

public static byte[] getLockData(java.lang.String path)

getSessionId

public static long getSessionId(ZooCache zc,
                                java.lang.String path)
                         throws org.apache.zookeeper.KeeperException,
                                java.lang.InterruptedException

Throws:

org.apache.zookeeper.KeeperException

java.lang.InterruptedException

getSessionId

public long getSessionId()
                  throws org.apache.zookeeper.KeeperException,
                         java.lang.InterruptedException

Throws:

org.apache.zookeeper.KeeperException

java.lang.InterruptedException

deleteLock

public static void deleteLock(java.lang.String path)
                       throws java.lang.InterruptedException,
                              org.apache.zookeeper.KeeperException

Throws:

java.lang.InterruptedException

org.apache.zookeeper.KeeperException

deleteLock

public static boolean deleteLock(java.lang.String path,
                                 java.lang.String lockData)
                          throws java.lang.InterruptedException,
                                 org.apache.zookeeper.KeeperException

Throws:

java.lang.InterruptedException

org.apache.zookeeper.KeeperException

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception