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Java > Open Source Codes > org > jboss > ejb3 > stateless > StatelessClusteredProxy


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
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7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.ejb3.stateless;
23
24 import java.lang.reflect.Method JavaDoc;
25 import java.lang.reflect.Proxy JavaDoc;
26 import org.jboss.aop.Dispatcher;
27 import org.jboss.aop.advice.Interceptor;
28 import org.jboss.aop.joinpoint.MethodInvocation;
29 import org.jboss.aop.util.MethodHashing;
30 import org.jboss.aop.util.PayloadKey;
31 import org.jboss.aspects.asynch.AsynchMixin;
32 import org.jboss.aspects.asynch.AsynchProvider;
33 import org.jboss.aspects.remoting.ClusterConstants;
34 import org.jboss.aspects.remoting.FamilyWrapper;
35 import org.jboss.aspects.remoting.InvokeRemoteInterceptor;
36 import org.jboss.ejb3.JBossProxy;
37 import org.jboss.ejb3.ProxyUtils;
38 import org.jboss.ejb3.asynchronous.AsynchronousInterceptor;
39 import org.jboss.ejb3.remoting.BaseRemoteProxy;
40 import org.jboss.ha.framework.interfaces.LoadBalancePolicy;
41
42 /**
43  * Comment
44  *
45  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
46  * @version $Revision: 37459 $
47  */
48 public class StatelessClusteredProxy extends BaseRemoteProxy
49 {
50    protected FamilyWrapper family;
51    protected LoadBalancePolicy lbPolicy;
52    AsynchProvider provider;
53
54    public StatelessClusteredProxy(Object JavaDoc containerId, Interceptor[] interceptors, FamilyWrapper family, LoadBalancePolicy lbPolicy)
55    {
56       super(containerId, interceptors);
57       this.family = family;
58       this.lbPolicy = lbPolicy;
59    }
60
61    public StatelessClusteredProxy(AsynchProvider provider, Object JavaDoc containerId, Interceptor[] interceptors, FamilyWrapper family, LoadBalancePolicy lbPolicy)
62    {
63       super(containerId, interceptors);
64       this.family = family;
65       this.lbPolicy = lbPolicy;
66       this.provider = provider;
67    }
68
69    public StatelessClusteredProxy()
70    {
71    }
72
73    public Object JavaDoc invoke(Object JavaDoc proxy, Method JavaDoc method, Object JavaDoc[] args)
74            throws Throwable JavaDoc
75    {
76       if (method.getDeclaringClass() == AsynchProvider.class)
77       {
78          return provider.getFuture();
79       }
80
81       long hash = MethodHashing.calculateHash(method);
82       Object JavaDoc ret = ProxyUtils.handleCallLocally(hash, (JBossProxy) proxy, this, method, args);
83       if (ret != null)
84       {
85          return ret;
86       }
87
88       MethodInvocation sri = new MethodInvocation(interceptors, hash, method, method, null);
89       sri.setArguments(args);
90       sri.setInstanceResolver(metadata);
91       sri.getMetaData().addMetaData(Dispatcher.DISPATCHER, Dispatcher.OID, containerId, PayloadKey.AS_IS);
92       sri.getMetaData().addMetaData(ClusterConstants.CLUSTERED_REMOTING, ClusterConstants.CLUSTER_FAMILY_WRAPPER, family, PayloadKey.AS_IS);
93       sri.getMetaData().addMetaData(ClusterConstants.CLUSTERED_REMOTING, ClusterConstants.LOADBALANCE_POLICY, lbPolicy, PayloadKey.AS_IS);
94       sri.getMetaData().addMetaData(InvokeRemoteInterceptor.REMOTING, InvokeRemoteInterceptor.SUBSYSTEM, "AOP", PayloadKey.AS_IS);
95
96       if (provider != null)
97       {
98          sri.getMetaData().addMetaData(AsynchronousInterceptor.ASYNCH, AsynchronousInterceptor.INVOKE_ASYNCH, "YES", PayloadKey.AS_IS);
99       }
100       return sri.invokeNext();
101    }
102
103    public Object JavaDoc getAsynchronousProxy(Object JavaDoc proxy)
104    {
105       Class JavaDoc[] infs = proxy.getClass().getInterfaces();
106       if (!ProxyUtils.isAsynchronous(infs))
107       {
108          Class JavaDoc[] interfaces = ProxyUtils.addAsynchProviderInterface(infs);
109          AsynchMixin mixin = new AsynchMixin();
110          Interceptor[] newInterceptors = ProxyUtils.addAsynchProxyInterceptor(mixin, interceptors);
111          StatelessClusteredProxy handler = new StatelessClusteredProxy(mixin, containerId, newInterceptors, family, lbPolicy);
112          return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), interfaces, handler);
113       }
114
115       //I was already asynchronous
116 return proxy;
117    }
118
119    public String JavaDoc toString()
120    {
121       return containerId.toString();
122    }
123
124 }
125
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