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1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 2002 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution, if
20 * any, must include the following acknowlegement:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowlegement may appear in the software itself,
24 * if and wherever such third-party acknowlegements normally appear.
25 *
26 * 4. The names "Apache BSF", "Apache", and "Apache Software Foundation"
27 * must not be used to endorse or promote products derived from
28 * this software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache"
32 * nor may "Apache" appear in their names without prior written
33 * permission of the Apache Group.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many individuals
50 * on behalf of the Apache Software Foundation and was originally created by
51 * Sanjiva Weerawarana and others at International Business Machines
52 * Corporation. For more information on the Apache Software Foundation,
53 * please see <http://www.apache.org/>.
54 */
55
56 package org.apache.bsf.debug.util;
57
58 import java.util;
59 import org.apache.bsf.debug.jsdi;
60 import org.apache.bsf.debug.util;
61
62 /**
63 * This class provides the resident object table for the
64 * mirrors. A Stub represents a remote JavaScript object
65 * or any remote concept that needs to be identified such
66 * engines or contexts which are not JavaScript objects.
67 *
68 * A Stub has a unique identifier allocated on the
69 * server. This is called its oid, for object identifier.
70 * The oid is not only carrying the identity but also the
71 * type of the remote object. Knowing the type is essential
72 * when a Stub has to be created. For instance, it is important
73 * to know if a remote object is just an object or a reified
74 * code as a script or a function.
75 *
76 * The oid is a long, the high word is the type (tid), the low word
77 * is the unique identifier (uid). The unique identifier is globally
78 * unique across all types.
79 *
80 * This class also acts as the factory for Stub objects.
81 * When a Stub is created, it is remembered in the resident
82 * object table for later rebinding from its uid.
83 *
84 */
85 public abstract class StubTable {
86
87 protected IntHashtable m_stubs;
88 protected SocketConnection m_con;
89
90 public StubTable(SocketConnection con) {
91 m_con = con;
92 m_stubs = new IntHashtable();
93 }
94
95 //------------------------------------------------------------
96 public void disconnectNotify() {
97 Enumeration e;
98 Stub s;
99 DebugLog.stdoutPrintln("Revoking stubs...",
100 DebugLog.BSF_LOG_L3);
101
102 e = m_stubs.elements();
103 while (e.hasMoreElements()) {
104 s = (Stub)e.nextElement();
105 s.revoked();
106 }
107 m_stubs = new IntHashtable();
108 }
109
110 //------------------------------------------------------------
111 protected abstract Stub factory(int tid, int uid);
112
113 //------------------------------------------------------------
114 public synchronized Stub swizzle(int tid, int uid) {
115 Stub Stub=null;
116
117 if (uid== DebugConstants.NOT_FOUND_UID)
118 return Stub.NOT_FOUND;
119 if (uid== DebugConstants.UNDEFINED_UID)
120 return Stub.UNDEFINED;
121
122 Stub = (Stub)m_stubs.get(uid);
123 if (Stub==null) {
124 Stub = factory(tid,uid);
125 m_stubs.put(uid,Stub);
126 }
127 return Stub;
128 }
129 }
130