alluxio.master.block.meta

Class WorkerMetaLock

java.lang.Object

alluxio.master.block.meta.WorkerMetaLock

All Implemented Interfaces:

Lock

public class WorkerMetaLock
extends Object
implements Lock

This class manages the logic of locking multiple sections in MasterWorkerInfo properly. As mentioned in javadoc of MasterWorkerInfo, there are multiple groups of metadata that requires external locking. This class is used to provide a clean interface to manage the locking logic and lock life cycles. When multiple WorkerMetaLockSection are specified, internally the locks will be locked in order, and unlocked in the opposite order, so that deadlock is prevented. This class implements Lock so it can be managed by LockResource. Callers do not need to lock and unlock explicitly.

Method Summary

Modifier and Type	Method and Description
void	lock()
void	lockInterruptibly()
Condition	newCondition()
boolean	tryLock()
boolean	tryLock(long time, TimeUnit unit)
void	unlock()

Methods inherited from class java.lang.Object

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

Method Detail

lock

public void lock()

Specified by:

lock in interface Lock

unlock

public void unlock()

Specified by:

unlock in interface Lock

lockInterruptibly

public void lockInterruptibly()
                       throws InterruptedException

Specified by:

lockInterruptibly in interface Lock

Throws:

InterruptedException

tryLock

public boolean tryLock()

Specified by:

tryLock in interface Lock

tryLock

public boolean tryLock(long time,
                       TimeUnit unit)
                throws InterruptedException

Specified by:

tryLock in interface Lock

Throws:

InterruptedException

newCondition

public Condition newCondition()

Specified by:

newCondition in interface Lock