LocalClientRequestDispatcherBase.java revision 608:7e06bf1dcb09 
1/*
2 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.corba.se.impl.protocol;
27
28import org.omg.CORBA.portable.ServantObject;
29
30import com.sun.corba.se.spi.protocol.LocalClientRequestDispatcher;
31import com.sun.corba.se.spi.protocol.RequestDispatcherRegistry;
32
33import com.sun.corba.se.spi.orb.ORB;
34import com.sun.corba.se.spi.ior.IOR ;
35import com.sun.corba.se.spi.oa.ObjectAdapterFactory;
36
37import com.sun.corba.se.spi.ior.ObjectAdapterId;
38import com.sun.corba.se.spi.ior.TaggedProfile;
39import com.sun.corba.se.spi.ior.ObjectKeyTemplate;
40import com.sun.corba.se.spi.ior.ObjectId;
41
42public abstract class LocalClientRequestDispatcherBase implements LocalClientRequestDispatcher
43{
44    protected ORB orb;
45    int scid;
46
47    // Cached information needed for local dispatch
48    protected boolean servantIsLocal ;
49    protected ObjectAdapterFactory oaf ;
50    protected ObjectAdapterId oaid ;
51    protected byte[] objectId ;
52
53    // If isNextIsLocalValid.get() == Boolean.TRUE,
54    // the next call to isLocal should be valid
55    private static final ThreadLocal isNextCallValid = new ThreadLocal() {
56            protected synchronized Object initialValue() {
57                return Boolean.TRUE;
58            }
59        };
60
61    protected LocalClientRequestDispatcherBase(ORB orb, int scid, IOR ior)
62    {
63        this.orb = orb ;
64
65        TaggedProfile prof = ior.getProfile() ;
66        servantIsLocal = orb.getORBData().isLocalOptimizationAllowed() &&
67            prof.isLocal();
68
69        ObjectKeyTemplate oktemp = prof.getObjectKeyTemplate() ;
70        this.scid = oktemp.getSubcontractId() ;
71        RequestDispatcherRegistry sreg = orb.getRequestDispatcherRegistry() ;
72        oaf = sreg.getObjectAdapterFactory( scid ) ;
73        oaid = oktemp.getObjectAdapterId() ;
74        ObjectId oid = prof.getObjectId() ;
75        objectId = oid.getId() ;
76    }
77
78    public byte[] getObjectId()
79    {
80        return objectId ;
81    }
82
83    public boolean is_local(org.omg.CORBA.Object self)
84    {
85        return false;
86    }
87
88    /*
89    * Possible paths through
90    * useLocalInvocation/servant_preinvoke/servant_postinvoke:
91    *
92    * A: call useLocalInvocation
93    * If useLocalInvocation returns false, servant_preinvoke is not called.
94    * If useLocalInvocation returns true,
95    * call servant_preinvoke
96    *   If servant_preinvoke returns null,
97    *       goto A
98    *   else
99    *       (local invocation proceeds normally)
100    *       servant_postinvoke is called
101    *
102    */
103    public boolean useLocalInvocation( org.omg.CORBA.Object self )
104    {
105        if (isNextCallValid.get() == Boolean.TRUE)
106            return servantIsLocal ;
107        else
108            isNextCallValid.set( Boolean.TRUE ) ;
109
110        return false ;
111    }
112
113    /** Check that the servant in info (which must not be null) is
114    * an instance of the expectedType.  If not, set the thread local flag
115    * and return false.
116    */
117    protected boolean checkForCompatibleServant( ServantObject so,
118        Class expectedType )
119    {
120        if (so == null)
121            return false ;
122
123        // Normally, this test will never fail.  However, if the servant
124        // and the stub were loaded in different class loaders, this test
125        // will fail.
126        if (!expectedType.isInstance( so.servant )) {
127            isNextCallValid.set( Boolean.FALSE ) ;
128
129            // When servant_preinvoke returns null, the stub will
130            // recursively re-invoke itself.  Thus, the next call made from
131            // the stub is another useLocalInvocation call.
132            return false ;
133        }
134
135        return true ;
136    }
137
138}
139
140// End of file.
141