01: /*
02: *
03: *
04: * Copyright 1990-2007 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.midp.services;
28:
29: import com.sun.midp.links.*;
30: import com.sun.midp.main.MIDletSuiteUtils;
31: import com.sun.midp.security.SecurityToken;
32: import com.sun.midp.security.Permissions;
33:
34: /**
35: * Used by client to obtain connection to service.
36: */
37: public abstract class SystemServiceRequestor {
38: private static SystemServiceRequestor instance = null;
39:
40: /**
41: * Establishes connection to service
42: *
43: * @param serviceID unique service ID
44: * @return connection to service
45: */
46: abstract public SystemServiceConnection requestService(
47: String serviceID);
48:
49: /**
50: * Gets class instance.
51: *
52: * @return SystemServiceRequestor class instance
53: */
54: synchronized public static SystemServiceRequestor getInstance(
55: SecurityToken token) {
56:
57: token.checkIfPermissionAllowed(Permissions.MIDP);
58:
59: if (instance == null) {
60: if (!MIDletSuiteUtils.isAmsIsolate()) {
61: Link receiveLink = NamedLinkPortal
62: .getLink(SystemServiceRequestHandler.SERVICE_TO_CLIENT_LINK_NAME);
63: Link sendLink = NamedLinkPortal
64: .getLink(SystemServiceRequestHandler.CLIENT_TO_SERVICE_LINK_NAME);
65: SystemServiceConnectionLinks requestLinks = null;
66: requestLinks = new SystemServiceConnectionLinks(
67: sendLink, receiveLink);
68:
69: instance = new SystemServiceRequestorRemote(
70: requestLinks);
71: } else {
72: SystemServiceManager manager = null;
73: manager = SystemServiceManager.getInstance(token);
74: instance = new SystemServiceRequestorLocal(manager);
75: }
76: }
77:
78: return instance;
79: }
80: }
|