01: /*
02: * %W% %E%
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: */
26:
27: package com.sun.jump.executive;
28:
29: import com.sun.jump.common.JUMPProcess;
30: import com.sun.jump.message.JUMPMessagingService;
31: import java.util.HashMap;
32: import java.util.Map;
33:
34: /**
35: * <code>JUMPExecutive</code> hosts all the JUMP executive services.
36: * The services are declratively specified
37: * in a file, which allows the executive to be extended with new
38: * services.
39: *
40: * @see com.sun.jump.module.JUMPModule
41: */
42: public abstract class JUMPExecutive implements JUMPProcess,
43: JUMPMessagingService {
44:
45: private static JUMPExecutive INSTANCE = null;
46:
47: protected Map moduleFactoryMap = null;
48:
49: /**
50: * Returns the singleton executive instance.
51: */
52: public static JUMPExecutive getInstance() {
53: return INSTANCE;
54: }
55:
56: /**
57: * Creates a new instance of JUMPExecutive
58: */
59: protected JUMPExecutive() {
60: synchronized (JUMPExecutive.class) {
61: if (INSTANCE == null) {
62: INSTANCE = this ;
63: }
64: }
65: this .moduleFactoryMap = new HashMap();
66: }
67:
68: /**
69: * Initialize the executive. This method initializes the list of
70: * modules, by reading the module definitions from a property file. This
71: * method can be overriden to load the modules using some other
72: * mechanism, even possibly hardcoding the list of modules.
73: */
74: protected void initialize() {
75: }
76:
77: /**
78: * Gets the User input manager configured with the executive.
79: */
80: public abstract JUMPUserInputManager getUserInputManager();
81:
82: /**
83: * Gets the Isolate factory configured with the executive.
84: */
85:
86: public abstract JUMPIsolateFactory getIsolateFactory();
87: }
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