Java Doc for JDBCOptimisticLock.java in  » EJB-Server-JBoss-4.2.1 » server » org » jboss » ejb » plugins » lock » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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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.NoLock
         org.jboss.ejb.plugins.lock.JDBCOptimisticLock

JDBCOptimisticLock
final public class JDBCOptimisticLock extends NoLock (Code)
This class is an optmistic lock implementation. It locks tableFields and their values during transaction. Locked tableFields and their values are added to the WHERE clause of the UPDATE SQL statement when entity is stored. The following strategies are supported: - fixed group of tableFields Fixed group of tableFields is used for locking . The tableFields and their values are locked at the beginning of a transaction. The group name must match one of the entity's load-group-name. - modified strategy The tableFields that were modified during transaction are used as lock. All entity's field values are locked at the beginning of the transaction. The tableFields are locked only after its actual change. - read strategy The tableFields that were read/modified during transaction. All entity's field values are locked at the beginning of the transaction. The tableFields are locked only after they were accessed. - version-column strategy This adds additional version field of type java.lang.Long. Each update of the entity will increase the version value by 1. - timestamp-column strategy Adds additional timestamp column of type java.util.Date. Each update of the entity will set the field to the current time. - key-generator column strategy Adds additional column. The type is defined by user. The key generator is used to set the next value. Note: all optimistic locking related code should be rewritten when in the new CMP design. Note2: done.
author:
   Alex Loubyansky
version:
   $Revision: 57209 $







Methods inherited from org.jboss.ejb.plugins.lock.NoLock
public void endInvocation(Invocation mi)(Code)(Java Doc)
public void endTransaction(Transaction transaction)(Code)(Java Doc)
public void schedule(Invocation mi) throws Exception(Code)(Java Doc)
public void wontSynchronize(Transaction trasaction)(Code)(Java Doc)

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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