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comparison src/com/go/trove/log/Syslog.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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1 /* ====================================================================
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
3 * ====================================================================
4 * The Tea Software License, Version 1.1
5 *
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. The end-user documentation included with the redistribution,
21 * if any, must include the following acknowledgment:
22 * "This product includes software developed by the
23 * Walt Disney Internet Group (http://opensource.go.com/)."
24 * Alternately, this acknowledgment may appear in the software itself,
25 * if and wherever such third-party acknowledgments normally appear.
26 *
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
28 * not be used to endorse or promote products derived from this
29 * software without prior written permission. For written
30 * permission, please contact opensource@dig.com.
31 *
32 * 5. Products derived from this software may not be called "Tea",
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
35 * written permission of the Walt Disney Internet Group.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * For more information about Tea, please see http://opensource.go.com/.
51 */
52
53 package com.go.trove.log;
54
55 import java.io.*;
56
57 /******************************************************************************
58 * Contains references to a static Log instance that can be used for general
59 * system-wide logging. By default, log messages are written to System.out
60 * or System.err. When "installed", all output provided to System.out
61 * and System.err is redirected into the system log.
62 *
63 * @author Brian S O'Neill
64 * @version
65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
66 * @see Log
67 */
68 public class Syslog {
69 private static final Log cLog;
70 private static final LogListener cSystemLogEventPrinter;
71
72 private static LogEventParsingOutputStream cSystemOut;
73 private static LogEventParsingOutputStream cSystemErr;
74
75 private static PrintStream cOriginalOut;
76 private static PrintStream cOriginalErr;
77 private static boolean cInstalled;
78
79 static {
80 cLog = new Log(null, null);
81 cLog.setDescription("System Log");
82
83 cSystemLogEventPrinter = new LogListener() {
84 public void logMessage(LogEvent e) {
85 PrintStream ps = getPrintStream(e);
86 String message = e.getMessage();
87 if (message == null) {
88 ps.println();
89 }
90 else {
91 ps.println(message);
92 }
93 }
94
95 public void logException(LogEvent e) {
96 Throwable t = e.getException();
97 if (t == null) {
98 logMessage(e);
99 }
100 else {
101 t.printStackTrace(getPrintStream(e));
102 }
103 }
104
105 private PrintStream getPrintStream(LogEvent e) {
106 synchronized (log()) {
107 switch (e.getType()) {
108 case LogEvent.DEBUG_TYPE:
109 case LogEvent.INFO_TYPE:
110 return (cInstalled) ? cOriginalOut : System.out;
111 }
112
113 return (cInstalled) ? cOriginalErr : System.err;
114 }
115 }
116 };
117
118 log().addLogListener(cSystemLogEventPrinter);
119 }
120
121 /**
122 * Returns the system Log instance that, by default, only has one
123 * LogListener. It prints debug and info LogEvent messages to System.out
124 * and other LogEvent messages to System.err.
125 *
126 * @see #getSystemLogEventPrinter()
127 */
128 public static Log log() {
129 return cLog;
130 }
131
132 /**
133 * Returns a simple LogListener that prints debug and info LogEvent
134 * messages to System.out and other LogEvent messages to System.err.
135 * Remove this listener to disable printing to System.out and System.err.
136 */
137 public static LogListener getSystemLogEventPrinter() {
138 return cSystemLogEventPrinter;
139 }
140
141 /**
142 * When installed, System.out and System.err are redirected to Syslog.log.
143 * System.out produces info events, and System.err produces error events.
144 */
145 public static void install() {
146 synchronized (log()) {
147 if (!cInstalled) {
148 cInstalled = true;
149 cOriginalOut = System.out;
150 cOriginalErr = System.err;
151
152 cSystemOut = new LogEventParsingOutputStream
153 (log(), LogEvent.INFO_TYPE)
154 {
155 public boolean isEnabled() {
156 return log().isInfoEnabled();
157 }
158 };
159 cSystemOut.addLogListener(log());
160 System.setOut(new PrintStream(cSystemOut, true));
161
162 cSystemErr = new LogEventParsingOutputStream
163 (log(), LogEvent.ERROR_TYPE)
164 {
165 public boolean isEnabled() {
166 return log().isErrorEnabled();
167 }
168 };
169 cSystemErr.addLogListener(log());
170 System.setErr(new PrintStream(cSystemErr, true));
171 }
172 }
173 }
174
175 /**
176 * Uninstalls by restoring System.out and System.err.
177 */
178 public static void uninstall() {
179 synchronized (log()) {
180 if (cInstalled) {
181 cInstalled = false;
182 System.setOut(cOriginalOut);
183 System.setErr(cOriginalErr);
184 cOriginalOut = null;
185 cOriginalErr = null;
186 cSystemOut = null;
187 cSystemErr = null;
188 }
189 }
190 }
191
192 /**
193 * Shortcut to {@link Log#debug(String) Syslog.log().debug(String)}.
194 */
195 public static void debug(String s) {
196 log().debug(s);
197 }
198
199 /**
200 * Shortcut to {@link Log#debug(Throwable) Syslog.log().debug(Throwable)}.
201 */
202 public static void debug(Throwable t) {
203 log().debug(t);
204 }
205
206 /**
207 * Shortcut to {@link Log#info(String) Syslog.log().info(String)}.
208 */
209 public static void info(String s) {
210 log().info(s);
211 }
212
213 /**
214 * Shortcut to {@link Log#info(Throwable) Syslog.log().info(Throwable)}.
215 */
216 public static void info(Throwable t) {
217 log().info(t);
218 }
219
220 /**
221 * Shortcut to {@link Log#warn(String) Syslog.log().warn(String)}.
222 */
223 public static void warn(String s) {
224 log().warn(s);
225 }
226
227 /**
228 * Shortcut to {@link Log#warn(Throwable) Syslog.log().warn(Throwable)}.
229 */
230 public static void warn(Throwable t) {
231 log().warn(t);
232 }
233
234 /**
235 * Shortcut to {@link Log#error(String) Syslog.log().error(String)}.
236 */
237 public static void error(String s) {
238 log().error(s);
239 }
240
241 /**
242 * Shortcut to {@link Log#error(Throwable) Syslog.log().error(Throwable)}.
243 */
244 public static void error(Throwable t) {
245 log().error(t);
246 }
247
248 private Syslog() {
249 }
250 }