atavism.server.util

Class DLock

java.lang.Object

java.util.concurrent.locks.ReentrantLock

atavism.server.util.DLock

All Implemented Interfaces:

java.io.Serializable, java.util.concurrent.locks.Lock

public class DLock
extends java.util.concurrent.locks.ReentrantLock

detection or debug lock

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
static java.util.Set<java.util.List<DLock>>	detectCycle() goes through the lock ordering map and looks for any cycles returns a set of cycles
protected static java.util.Set<java.util.List<DLock>>	detectCycleHelper(DLock node, java.util.List<DLock> history, java.util.HashSet<DLock> cycleNodes)
protected static java.util.Set<DLock>	getChildNodes()
java.lang.String	getLockName()
protected static java.util.Set<DLock>	getTopNodes(java.util.Set<DLock> childNodes)
protected static boolean	isSubset(java.util.List<DLock> subset, java.util.List<DLock> superset)
protected static boolean	isSubset(java.util.List<DLock> set, java.util.Set<java.util.List<DLock>> allSets)
void	lock()
void	lock(boolean acquireLock)
void	lockInterruptibly()
static void	main(java.lang.String[] args)
static java.lang.String	makeStackDumpString(java.lang.StackTraceElement[] stackArray) turn the stacktrace dump into a string
java.util.concurrent.locks.Condition	newCondition()
protected static void	printCycle(java.util.List<DLock> cycle)
void	setName(java.lang.String name)
protected static void	stackDump(java.util.List<DLock> nodes) given the sequence of nodes which led to a cycle, this method will print out the stack dumps for each lock sequence assumes we have synchronized the DLock.class object
java.lang.String	toString()
boolean	tryLock()
boolean	tryLock(long time, java.util.concurrent.TimeUnit unit)
void	unlock()

Methods inherited from class java.util.concurrent.locks.ReentrantLock

getHoldCount, getOwner, getQueuedThreads, getQueueLength, getWaitingThreads, getWaitQueueLength, hasQueuedThread, hasQueuedThreads, hasWaiters, isFair, isHeldByCurrentThread, isLocked

Methods inherited from class java.lang.Object

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

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.util.concurrent.locks.ReentrantLock

setName

public void setName(java.lang.String name)

getLockName

public java.lang.String getLockName()

tryLock

public boolean tryLock()

Specified by:

tryLock in interface java.util.concurrent.locks.Lock

Overrides:

tryLock in class java.util.concurrent.locks.ReentrantLock

tryLock

public boolean tryLock(long time,
                       java.util.concurrent.TimeUnit unit)
                throws java.lang.InterruptedException

Specified by:

tryLock in interface java.util.concurrent.locks.Lock

Overrides:

tryLock in class java.util.concurrent.locks.ReentrantLock

Throws:

java.lang.InterruptedException

lockInterruptibly

public void lockInterruptibly()
                       throws java.lang.InterruptedException

Specified by:

lockInterruptibly in interface java.util.concurrent.locks.Lock

Overrides:

lockInterruptibly in class java.util.concurrent.locks.ReentrantLock

Throws:

java.lang.InterruptedException

newCondition

public java.util.concurrent.locks.Condition newCondition()

Specified by:

newCondition in interface java.util.concurrent.locks.Lock

Overrides:

newCondition in class java.util.concurrent.locks.ReentrantLock

lock

public void lock()

Specified by:

lock in interface java.util.concurrent.locks.Lock

Overrides:

lock in class java.util.concurrent.locks.ReentrantLock

lock

public void lock(boolean acquireLock)

unlock

public void unlock()

Specified by:

unlock in interface java.util.concurrent.locks.Lock

Overrides:

unlock in class java.util.concurrent.locks.ReentrantLock

detectCycle

public static java.util.Set<java.util.List<DLock>> detectCycle()

goes through the lock ordering map and looks for any cycles returns a set of cycles

isSubset

protected static boolean isSubset(java.util.List<DLock> set,
                                  java.util.Set<java.util.List<DLock>> allSets)

isSubset

protected static boolean isSubset(java.util.List<DLock> subset,
                                  java.util.List<DLock> superset)

getChildNodes

protected static java.util.Set<DLock> getChildNodes()

getTopNodes

protected static java.util.Set<DLock> getTopNodes(java.util.Set<DLock> childNodes)

detectCycleHelper

protected static java.util.Set<java.util.List<DLock>> detectCycleHelper(DLock node,
                                                                        java.util.List<DLock> history,
                                                                        java.util.HashSet<DLock> cycleNodes)

stackDump

protected static void stackDump(java.util.List<DLock> nodes)

given the sequence of nodes which led to a cycle, this method will print out the stack dumps for each lock sequence assumes we have synchronized the DLock.class object

printCycle

protected static void printCycle(java.util.List<DLock> cycle)

makeStackDumpString

public static java.lang.String makeStackDumpString(java.lang.StackTraceElement[] stackArray)

turn the stacktrace dump into a string

main

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