Jboss源码解析

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1、http://opensource.objectsbydesign.com/jboss/index.htmlhttp://www.mscto.com/JavaBase/2009022570733.html(本文网址)Jboss源码解析JBoss是一个非常优秀的J2EE的ApplicationServer,研究它的源代码有助于我们更好的理解J2EE的各种技术。本系列拟从四个方面分析Jboss源码：1.EJBContainer实现2.Transaction实现3.PersistenceMapping4.Client到Server端的Invocation

2、-------------------------------------------------------------------先说第1点:EJBContainer实现。1.1EJBPool我们知道，EJBContainer会维护一个EJB池，在多个client间共享，避免频繁创建销毁对象的开销。让我们来看看Jboss实现的Pool:EJB分EntityBean,MDB,Stateless/StatefulSessionBean,而Jboss中也对应的有EntityInstancePool，MessageDrivenInstancePool,

3、StatefulSessionInstancePool,StatelessSessionInstancePool.让我们先从这4个类的共同基类AbstractInstancePool看起：classAbstractInstancePool实现了接口InstancePool，该接口有以下几个方法：EntERPriseContextget()throwsException;voidfree(EnterpriseContextctx);voiddiscard(EnterpriseContextctx);intgetCurrentSize();public

4、intgetMaxSize();--------------------------------------------------------------------先对EnterpriseContext作番说明。EnterpriseContext的作用就是把具体的EJBinstance和它的metadata联系起来。该类签名为：publicabstractclassEnterpriseContext，有4个子类，EntityEnterpriseContext，MessageDrivenEnterpriseContext，StatefulSess

5、ionEnterpriseContext，StatelessSessionEnterpriseContext。分别对应4种类型的EJB。EnterpriseContext中有几个重要的成员变量。/**TheEJBinstance*/Objectinstance;/**Thecontainerusingthiscontext*/Containercon;//Container这个类是JBoss用来代表对EJB提供Transaction,Security，Pool等服务的类，我们回头还会再说。/**OnlyStatelessSessionbeansha

6、venoId,statefulandentitydo*/Objectid;/**Thetransactionassociatedwiththeinstance*/Transactiontransaction;//Transaction，我们下节再说.//Constructors--------------------------------------------------publicEnterpriseContext(Objectinstance,Containercon){this.instance=instance;this.con=con

7、;}publicObjectgetInstance(){returninstance;}publicContainergetContainer(){returncon;}publicvoidsetId(Objectid){this.id=id;}publicObjectgetId(){returnid;}publicvoidsetTransaction(Transactiontransaction){this.transaction=transaction;}publicTransactiongetTransaction(){returntrans

8、action;}privateEntityContextctx;StatefulSessionEnterpriseCont