CommandInterceptor.java |
/* PAT: Persistent Applications Toolkit (patsystem.sf.net) * Copyright (C) 2004, 2005 Tomasz Nazar, nthx at irc dot pl * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Full version of the license is /docs/LICENSE.txt */ package org.nthx.pat; import org.apache.log4j.Logger; import org.jboss.aop.joinpoint.Invocation; import org.jboss.aop.joinpoint.MethodInvocation; import org.nthx.util.jbossaop.DefaultInterceptorImpl; /** An aspect for intercepting every transacted method of system. * That's the main feature of PAT: provide automated transactions on demand. * <p>Demand is specified by providing: 'pat.transaction' metadata in your * code. * * @see GenericCommand * * @version $Id: CommandInterceptor.java 3725 2005-06-09 23:57:03Z nthx $ * @author nthx@users.sourceforge.net */ public class CommandInterceptor extends DefaultInterceptorImpl { private static Logger log = Logger.getLogger("pat"); public Object invoke(Invocation invocation) throws Throwable { if (Pat.getInstance().isInNoCommandsMode()) return invocation.invokeNext(); if (Pat.getInstance().beforeRootConstructor()) { return invocation.invokeNext(); } MethodInvocation mi = (MethodInvocation) invocation; GenericCommand genericCommand = new GenericCommand( invocation.getTargetObject(), mi.getMethod(), mi.getArguments() ); return Pat.getInstance().executeCommand(genericCommand); /* This is list place for future optimization: * We might want not to invoke logic from 'command', because it always * uses reflection. * Instead we might just 'save' command without invoking it, and * "proceed" with code - which equals in-command logic anyway. */ } }