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Java > Open Source Codes > org > jboss > aspects > remoting > MergeMetaDataInterceptor


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.
6   *
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.aspects.remoting;
23
24 import org.jboss.aop.joinpoint.Invocation;
25 import org.jboss.aop.joinpoint.InvocationBase;
26 import org.jboss.aop.metadata.MetaDataResolver;
27 import org.jboss.aop.metadata.SimpleMetaData;
28 /**
29  * Prepare Metadata to be marshalled across the wire.
30  * This interceptor iterates through an Invocation's
31  * metadata resolver list to pull out transportable
32  * metadata and stuff it into the invocation
33  *
34  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
35  * @version $Revision: 37406 $
36  */
37 public class MergeMetaDataInterceptor implements org.jboss.aop.advice.Interceptor, java.io.Serializable JavaDoc
38 {
39    private static final long serialVersionUID = 2424149906770308705L;
40
41    public static final MergeMetaDataInterceptor singleton = new MergeMetaDataInterceptor();
42
43    public String JavaDoc getName() { return "MergeMetaDataInterceptor"; }
44
45    protected org.jboss.aop.metadata.SimpleMetaData merge(Invocation invocation, MetaDataResolver resolver, SimpleMetaData merged)
46    {
47       if (resolver == null) return merged;
48       org.jboss.aop.metadata.SimpleMetaData metadata = resolver.getAllMetaData(invocation);
49       if (metadata == null) return merged;
50       if (merged == null)
51       {
52          merged = new org.jboss.aop.metadata.SimpleMetaData();
53       }
54       merged.mergeIn(metadata);
55       return merged;
56    }
57
58    public Object JavaDoc invoke(Invocation invocation) throws Throwable JavaDoc
59    {
60       org.jboss.aop.metadata.SimpleMetaData merged = null;
61       merged = merge(invocation, ((InvocationBase)invocation).getInstanceResolver(), merged);
62
63       org.jboss.aop.metadata.MetaDataResolver threadMetaData = org.jboss.aop.metadata.ThreadMetaData.instance().getAllMetaData(invocation);
64       merged = merge(invocation, threadMetaData, merged);
65
66       if (merged != null)
67       {
68          // Invocation data should override all merged data
69 merged.mergeIn(invocation.getMetaData());
70
71          // replace invocation's metadata with merged
72 invocation.setMetaData(merged);
73       }
74       return invocation.invokeNext();
75    }
76 }
77
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