Mercurial > hg > blitz_condensed
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/com/go/trove/log/Syslog.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,250 @@ +/* ==================================================================== + * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group + * ==================================================================== + * The Tea Software License, Version 1.1 + * + * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Walt Disney Internet Group (http://opensource.go.com/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact opensource@dig.com. + * + * 5. Products derived from this software may not be called "Tea", + * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", + * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior + * written permission of the Walt Disney Internet Group. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * For more information about Tea, please see http://opensource.go.com/. + */ + +package com.go.trove.log; + +import java.io.*; + +/****************************************************************************** + * Contains references to a static Log instance that can be used for general + * system-wide logging. By default, log messages are written to System.out + * or System.err. When "installed", all output provided to System.out + * and System.err is redirected into the system log. + * + * @author Brian S O'Neill + * @version + * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $--> + * @see Log + */ +public class Syslog { + private static final Log cLog; + private static final LogListener cSystemLogEventPrinter; + + private static LogEventParsingOutputStream cSystemOut; + private static LogEventParsingOutputStream cSystemErr; + + private static PrintStream cOriginalOut; + private static PrintStream cOriginalErr; + private static boolean cInstalled; + + static { + cLog = new Log(null, null); + cLog.setDescription("System Log"); + + cSystemLogEventPrinter = new LogListener() { + public void logMessage(LogEvent e) { + PrintStream ps = getPrintStream(e); + String message = e.getMessage(); + if (message == null) { + ps.println(); + } + else { + ps.println(message); + } + } + + public void logException(LogEvent e) { + Throwable t = e.getException(); + if (t == null) { + logMessage(e); + } + else { + t.printStackTrace(getPrintStream(e)); + } + } + + private PrintStream getPrintStream(LogEvent e) { + synchronized (log()) { + switch (e.getType()) { + case LogEvent.DEBUG_TYPE: + case LogEvent.INFO_TYPE: + return (cInstalled) ? cOriginalOut : System.out; + } + + return (cInstalled) ? cOriginalErr : System.err; + } + } + }; + + log().addLogListener(cSystemLogEventPrinter); + } + + /** + * Returns the system Log instance that, by default, only has one + * LogListener. It prints debug and info LogEvent messages to System.out + * and other LogEvent messages to System.err. + * + * @see #getSystemLogEventPrinter() + */ + public static Log log() { + return cLog; + } + + /** + * Returns a simple LogListener that prints debug and info LogEvent + * messages to System.out and other LogEvent messages to System.err. + * Remove this listener to disable printing to System.out and System.err. + */ + public static LogListener getSystemLogEventPrinter() { + return cSystemLogEventPrinter; + } + + /** + * When installed, System.out and System.err are redirected to Syslog.log. + * System.out produces info events, and System.err produces error events. + */ + public static void install() { + synchronized (log()) { + if (!cInstalled) { + cInstalled = true; + cOriginalOut = System.out; + cOriginalErr = System.err; + + cSystemOut = new LogEventParsingOutputStream + (log(), LogEvent.INFO_TYPE) + { + public boolean isEnabled() { + return log().isInfoEnabled(); + } + }; + cSystemOut.addLogListener(log()); + System.setOut(new PrintStream(cSystemOut, true)); + + cSystemErr = new LogEventParsingOutputStream + (log(), LogEvent.ERROR_TYPE) + { + public boolean isEnabled() { + return log().isErrorEnabled(); + } + }; + cSystemErr.addLogListener(log()); + System.setErr(new PrintStream(cSystemErr, true)); + } + } + } + + /** + * Uninstalls by restoring System.out and System.err. + */ + public static void uninstall() { + synchronized (log()) { + if (cInstalled) { + cInstalled = false; + System.setOut(cOriginalOut); + System.setErr(cOriginalErr); + cOriginalOut = null; + cOriginalErr = null; + cSystemOut = null; + cSystemErr = null; + } + } + } + + /** + * Shortcut to {@link Log#debug(String) Syslog.log().debug(String)}. + */ + public static void debug(String s) { + log().debug(s); + } + + /** + * Shortcut to {@link Log#debug(Throwable) Syslog.log().debug(Throwable)}. + */ + public static void debug(Throwable t) { + log().debug(t); + } + + /** + * Shortcut to {@link Log#info(String) Syslog.log().info(String)}. + */ + public static void info(String s) { + log().info(s); + } + + /** + * Shortcut to {@link Log#info(Throwable) Syslog.log().info(Throwable)}. + */ + public static void info(Throwable t) { + log().info(t); + } + + /** + * Shortcut to {@link Log#warn(String) Syslog.log().warn(String)}. + */ + public static void warn(String s) { + log().warn(s); + } + + /** + * Shortcut to {@link Log#warn(Throwable) Syslog.log().warn(Throwable)}. + */ + public static void warn(Throwable t) { + log().warn(t); + } + + /** + * Shortcut to {@link Log#error(String) Syslog.log().error(String)}. + */ + public static void error(String s) { + log().error(s); + } + + /** + * Shortcut to {@link Log#error(Throwable) Syslog.log().error(Throwable)}. + */ + public static void error(Throwable t) { + log().error(t); + } + + private Syslog() { + } +}