JDBCCommandFactory (JBoss Server API) - JBoss 3.2.7 server API Documentation 英文版文档

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org.jboss.ejb.plugins.jaws.jdbc
Class JDBCCommandFactory

java.lang.Object
  org.jboss.ejb.plugins.jaws.jdbc.JDBCCommandFactory

All Implemented Interfaces:: JPMCommandFactory

public class JDBCCommandFactory
extends Object
implements JPMCommandFactory

Command factory for the JAWS JDBC layer. This class is primarily responsible for creating instances of the JDBC implementations for the various JPM commands so that the JAWSPersistenceManager (actually an persistence store) can delegate to them in a decoupled manner.

This class also acts as the manager for the read-ahead buffer added in version 2.3/2.4. In order to manage this buffer, it must register itself with any transaction that is active when a finder is called so that the data that was read ahead can be discarded before completion of the transaction. The read ahead buffer is managed using Soft references, with a ReferenceQueue being used to tell when the VM has garbage collected an object so that we can keep the hashtables clean.

Version:

$Revision: 1.21 $

Revisions:

20010621 Bill Burke:

createDefinedFinderCommand creates different objects based on the read-head flag of the FinderMetaData.

20010621 danch:

extended Bill's change to work on other finder types; removed stale todos.

20010812 vincent.harcq@hubmethods.com:

Get Rid of debug flag, use log4j instead

Author:

Justin Forder, danch (Dan Christopherson), Bill Burke

Constructor Summary

JDBCCommandFactory(EntityContainer container)


Method Summary

JPMActivateEntityCommand createActivateEntityCommand()


JDBCBeanExistsCommand createBeanExistsCommand()
          Singleton: multiple callers get references to the same command instance.

JPMCreateEntityCommand createCreateEntityCommand()


JPMFindEntitiesCommand createDefinedFinderCommand(FinderMetaData f)


JPMDestroyCommand createDestroyCommand()


JPMFindEntitiesCommand createFindAllCommand(FinderMetaData f)


JPMFindEntitiesCommand createFindByCommand(Method finderMethod, FinderMetaData f)


JPMFindEntitiesCommand createFindEntitiesCommand()
          Singleton: multiple callers get references to the same command instance.

JPMFindEntityCommand createFindEntityCommand()


JPMInitCommand createInitCommand()


JPMLoadEntityCommand createLoadEntityCommand()


JPMPassivateEntityCommand createPassivateEntityCommand()


JPMRemoveEntityCommand createRemoveEntityCommand()


JPMStartCommand createStartCommand()


JPMStopCommand createStopCommand()


JPMStoreEntityCommand createStoreEntityCommand()


void destroy()


EntityContainer getContainer()


JawsEntityMetaData getMetaData()


Methods inherited from class java.lang.Object

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

Constructor Detail