org.apache.accumulo.fate.zookeeper

Class ZooLock

java.lang.Object

org.apache.accumulo.fate.zookeeper.ZooLock

All Implemented Interfaces:

org.apache.zookeeper.Watcher

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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ZooLock.AsyncLockWatcher
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

Fields

Modifier and Type	Field and Description
static String	LOCK_PREFIX
protected static org.apache.log4j.Logger	log
protected IZooReaderWriter	zooKeeper

Constructor Summary

Constructors

Modifier	Constructor and Description
	ZooLock(String zookeepers, int timeInMillis, String scheme, byte[] auth, String path)
protected	ZooLock(ZooCache zc, IZooReaderWriter zrw, String path)

Method Summary

Methods

Modifier and Type	Method and Description
static void	deleteLock(IZooReaderWriter zk, String path)
static boolean	deleteLock(IZooReaderWriter zk, String path, String lockData)
static byte[]	getLockData(ZooCache zc, String path, org.apache.zookeeper.data.Stat stat)
static byte[]	getLockData(org.apache.zookeeper.ZooKeeper zk, String path)
ZooUtil.LockID	getLockID()
String	getLockName()
String	getLockPath()
long	getSessionId()
static long	getSessionId(ZooCache zc, String path)
boolean	isLocked()
static boolean	isLockHeld(ZooCache zc, ZooUtil.LockID lid)
static boolean	isLockHeld(org.apache.zookeeper.ZooKeeper zk, ZooUtil.LockID lid)
void	lockAsync(ZooLock.AsyncLockWatcher lw, byte[] data)
void	process(org.apache.zookeeper.WatchedEvent event)
void	replaceLockData(byte[] b)
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

log

protected static final org.apache.log4j.Logger log

LOCK_PREFIX

public static final String LOCK_PREFIX

See Also:

Constant Field Values

zooKeeper

protected final IZooReaderWriter zooKeeper

Constructor Detail

ZooLock

public ZooLock(String zookeepers,
       int timeInMillis,
       String scheme,
       byte[] auth,
       String path)

ZooLock

protected ZooLock(ZooCache zc,
       IZooReaderWriter zrw,
       String path)

Method Detail

tryLock

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

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

lockAsync

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

tryToCancelAsyncLockOrUnlock

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

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

unlock

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

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

getLockPath

public String getLockPath()

getLockName

public String getLockName()

getLockID

public ZooUtil.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:

true if the lock was aquired, otherwise false.

isLocked

public boolean isLocked()

replaceLockData

public void replaceLockData(byte[] b)
                     throws org.apache.zookeeper.KeeperException,
                            InterruptedException

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

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,
                 ZooUtil.LockID lid)
                          throws org.apache.zookeeper.KeeperException,
                                 InterruptedException

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

isLockHeld

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

getLockData

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

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

getLockData

public static byte[] getLockData(ZooCache zc,
                 String path,
                 org.apache.zookeeper.data.Stat stat)

getSessionId

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

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

getSessionId

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

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

deleteLock

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

Throws:

InterruptedException

org.apache.zookeeper.KeeperException

deleteLock

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

Throws:

InterruptedException

org.apache.zookeeper.KeeperException