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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » server » org.jboss.ejb.plugins.lock 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.jboss.ejb.plugins.lock.BeanLockSupport
      org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock

All known Subclasses:   org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLockNoADE,
QueuedPessimisticEJBLock
public class QueuedPessimisticEJBLock extends BeanLockSupport (Code)
This class is holds threads awaiting the transactional lock to be free in a fair FIFO transactional queue. Non-transactional threads are also put in this wait queue as well. Unlike SimplePessimisticEJBLock which notifies all threads on transaction completion, this class pops the next waiting transaction from the queue and notifies only those threads waiting associated with that transaction. This class should perform better than Simple on high contention loads. Holds all locks for entity beans, not used for stateful.

All BeanLocks have a reference count. When the reference count goes to 0, the lock is released from the id -> lock mapping. As of 04/10/2002, you can now specify in jboss.xml method attributes that define methods as read-only. read-only methods(and read-only beans) will release transactional locks at the end of the invocation. This decreases likelyhood of deadlock and increases performance. FIXME marcf: we should get solid numbers on this locking, bench in multi-thread environments We need someone with serious SUN hardware to run this lock into the ground
author:
   Marc Fleury
author:
   Bill Burke
author:
   Peter Murray
version:
   $Revision: 57209 $



Field Summary
protected  booleandeadlockDetection
    
protected  LockMonitorlockMonitor
    


Method Summary
protected  booleandoSchedule(Invocation mi)
     doSchedule(Invocation) doSchedule implements a particular policy for scheduling the threads coming in. There is always the spec required "serialization" but we can add custom scheduling in here Synchronizing on lock: a failure to get scheduled must result in a wait() call and a release of the lock.
public  voidendInvocation(Invocation mi)
    
public  voidendTransaction(Transaction transaction)
    
public  booleangetDeadlockDetection()
    
protected  TxLockgetTxLock(Transaction miTx)
    
protected  booleanisTxExpired(Transaction miTx)
    
protected  voidnextTransaction()
    
public  voidremoveRef()
    
public  voidschedule(Invocation mi)
    
public  voidsetContainer(Container container)
    
public  voidsetDeadlockDetection(boolean flag)
    
public  StringtoString()
    
protected  booleanwaitForTx(Transaction miTx, boolean trace)
     Wait until no other transaction is running with this lock.
public  voidwontSynchronize(Transaction trasaction)
    

Field Detail
deadlockDetection
protected boolean deadlockDetection(Code)
A flag that disables the deadlock detection check



lockMonitor
protected LockMonitor lockMonitor(Code)





Method Detail
doSchedule
protected boolean doSchedule(Invocation mi) throws Exception(Code)
doSchedule(Invocation) doSchedule implements a particular policy for scheduling the threads coming in. There is always the spec required "serialization" but we can add custom scheduling in here Synchronizing on lock: a failure to get scheduled must result in a wait() call and a release of the lock. Schedulation must return with lock.



endInvocation
public void endInvocation(Invocation mi)(Code)
releaseMethodLock if we reach the count of zero it means the instance is free from threads (and reentrency) we wake up the next thread in the currentLock



endTransaction
public void endTransaction(Transaction transaction)(Code)



getDeadlockDetection
public boolean getDeadlockDetection()(Code)



getTxLock
protected TxLock getTxLock(Transaction miTx)(Code)



isTxExpired
protected boolean isTxExpired(Transaction miTx) throws Exception(Code)



nextTransaction
protected void nextTransaction()(Code)



removeRef
public void removeRef()(Code)



schedule
public void schedule(Invocation mi) throws Exception(Code)



setContainer
public void setContainer(Container container)(Code)



setDeadlockDetection
public void setDeadlockDetection(boolean flag)(Code)



toString
public String toString()(Code)



waitForTx
protected boolean waitForTx(Transaction miTx, boolean trace) throws Exception(Code)
Wait until no other transaction is running with this lock. Returns true if this thread was scheduled in txWaitQueue



wontSynchronize
public void wontSynchronize(Transaction trasaction)(Code)



Fields inherited from org.jboss.ejb.plugins.lock.BeanLockSupport
protected Container container(Code)(Java Doc)
protected Object id(Code)(Java Doc)
static Logger log(Code)(Java Doc)
protected int refs(Code)(Java Doc)
protected Thread synched(Code)(Java Doc)
protected int synchedDepth(Code)(Java Doc)
protected Transaction tx(Code)(Java Doc)
protected int txTimeout(Code)(Java Doc)

Methods inherited from org.jboss.ejb.plugins.lock.BeanLockSupport
public void addRef()(Code)(Java Doc)
public boolean attemptSync()(Code)(Java Doc)
abstract public void endInvocation(Invocation mi)(Code)(Java Doc)
abstract public void endTransaction(Transaction tx)(Code)(Java Doc)
public Object getId()(Code)(Java Doc)
public int getRefs()(Code)(Java Doc)
public Object getResourceHolder()(Code)(Java Doc)
public Transaction getTransaction()(Code)(Java Doc)
public void releaseSync()(Code)(Java Doc)
public void removeRef()(Code)(Java Doc)
abstract public void schedule(Invocation mi) throws Exception(Code)(Java Doc)
public void setContainer(Container container)(Code)(Java Doc)
public void setId(Object id)(Code)(Java Doc)
public void setTimeout(int timeout)(Code)(Java Doc)
public void setTransaction(Transaction tx)(Code)(Java Doc)
public void sync()(Code)(Java Doc)
abstract public void wontSynchronize(Transaction tx)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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