Mercurial > hg > blitz_condensed
comparison src/com/go/trove/log/Syslog.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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-1:000000000000 | 0:3dc0c5604566 |
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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 } |