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 java.io.*;
31:
32: final class SystemServiceRequestorRemote extends SystemServiceRequestor {
33: private SystemServiceConnectionLinks sendReceiveLinks = null;
34: private SystemServiceRequestProtocolClient requestProtocol = null;
35:
36: SystemServiceRequestorRemote(
37: SystemServiceConnectionLinks sendReceiveLinks) {
38:
39: this .sendReceiveLinks = sendReceiveLinks;
40: if (sendReceiveLinks != null) {
41: this .requestProtocol = new SystemServiceRequestProtocolClient(
42: sendReceiveLinks);
43: }
44: }
45:
46: public SystemServiceConnection requestService(String serviceID) {
47: synchronized (this ) {
48: return doRequestService(serviceID);
49: }
50: }
51:
52: private SystemServiceConnection doRequestService(String serviceID) {
53: if (sendReceiveLinks == null) {
54: return null;
55: }
56:
57: try {
58: // send empty message to kick a session
59: Link sendLink = sendReceiveLinks.getSendLink();
60: LinkMessage emptyMsg = LinkMessage.newStringMessage("");
61: sendLink.send(emptyMsg);
62:
63: requestProtocol.requestService(serviceID);
64: SystemServiceConnectionLinks connectionLinks = requestProtocol
65: .getSystemServiceConnectionLinks();
66:
67: if (connectionLinks != null) {
68: return new SystemServiceConnectionImpl(connectionLinks);
69: } else {
70: return null;
71: }
72: } catch (ClosedLinkException e) {
73: sendReceiveLinks.close();
74: sendReceiveLinks = null;
75:
76: return null;
77: } catch (InterruptedIOException e) {
78: sendReceiveLinks.close();
79: sendReceiveLinks = null;
80:
81: return null;
82: } catch (IOException e) {
83: sendReceiveLinks.close();
84: sendReceiveLinks = null;
85:
86: return null;
87: } catch (IllegalStateException e) {
88: sendReceiveLinks.close();
89: sendReceiveLinks = null;
90:
91: return null;
92: }
93: }
94: }
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