AfflictionNetworks/samskivert
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Allow a log provider and/or the log level to be set at JVM start time via

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system properties.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@699 6335cc39-0255-0410-8fd6-9bcaacd3b74c
This commit is contained in:
mdb
2002-04-09 05:13:28 +00:00
parent c576508fb3
commit 432fd659bf
1 changed files with 66 additions and 3 deletions
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projects/samskivert/src/java/com/samskivert/util/Log.java
+66 -3
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@@ -1,5 +1,5 @@
//
// $Id: Log.java,v 1.5 2001/08/12 01:34:31 mdb Exp $
// $Id: Log.java,v 1.6 2002/04/09 05:13:28 mdb Exp $
//
// samskivert library - useful routines for java programs
// Copyright (C) 2001 Michael Bayne
@@ -27,6 +27,14 @@ package com.samskivert.util;
* is expected that the {@link LogProvider} interface will be used to
* map these log services onto whatever more general purpose logging
* framework is in use by the user of the samskivert codebase.
*
* <p> The log provider can be set via a system property to ensure that it
* is in effect as soon as the log services are used. When invoking your
* JVM, specify <code>-Dlog_provider=classname</code> and it will
* automatically be instantiated and put into effect by the log services.
* If your log provider needs more sophisticated configuration, you'll
* have to instantiate it yourself and set it using {@link
* #setLogProvider}.
*/
public final class Log
{
@@ -34,10 +42,10 @@ public final class Log
public static final int DEBUG = 0;
/** Log level constant for info entries. */
public static final int INFO = 0;
public static final int INFO = 1;
/** Log level constant for warning entries. */
public static final int WARNING = 0;
public static final int WARNING = 2;
/**
* Constructs a new log object with the supplied module name.
@@ -119,9 +127,64 @@ public final class Log
_provider = provider;
}
/**
* Checks the <code>log_provider</code> system property to see if a
* log provider has been specified. Installs it if so. Checks the
* <code>log_level</code> system property to see if a default log
* level has been specified. Sets it if so.
*/
protected static void inferConfiguration ()
{
// first set up our provider
String provider = null;
try {
provider = System.getProperty("log_provider");
if (provider != null) {
Class lpclass = Class.forName(provider);
_provider = (LogProvider)lpclass.newInstance();
}
} catch (SecurityException se) {
// ignore security exceptions; we're just running in a JVM
// that won't let us read system properties
} catch (Exception e) {
_provider.log(WARNING, "samskivert",
"Error instantating log provider " +
"[class=" + provider + ", error=" + e + "].");
}
// now set our log level
try {
String level = System.getProperty("log_level");
if (level != null) {
if (level.equalsIgnoreCase("debug")) {
_provider.setLevel(DEBUG);
} else if (level.equalsIgnoreCase("info")) {
_provider.setLevel(INFO);
} else if (level.equalsIgnoreCase("warning")) {
_provider.setLevel(WARNING);
} else {
_provider.log(WARNING, "samskivert",
"Unknown log level requested " +
"[level=" + level + "].");
}
}
} catch (SecurityException se) {
// ignore security exceptions; we're just running in a JVM
// that won't let us read system properties
}
}
/** The name of the module to which this log instance is associated. */
protected String _moduleName;
/** The log provider currently in use by the log services. */
protected static LogProvider _provider = new DefaultLogProvider();
// read our configuration when the class is loaded
static {
inferConfiguration();
}
}