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Posted to log4j-dev@logging.apache.org by Marco Brandizi <br...@libero.it> on 2001/05/11 09:16:23 UTC
Dispatching messages to different files on the basis of priorities
Hello,
I'm an happy user of Log4J. I didn't understand if in new 1.6b version
is avaible a "Priority Appender". I mean: an appender able to dispatch
received messages to several destinations, one per each priority level.
I already have developed classes to do that (one generic and one child,
specific for files), which you find attached to this message, but still
I have to develop the XML configuration part, which is very important
for the context where I use them. If someone already has something
alike, would be welcome ;-)
Please, answer me privately too, not only in the mailing list, otherwise
I could forget it... ;-)
Greetings
=================================================================
Marco Brandizi <br...@libero_NOSPAM_.it>
WARNING: My email address is in "NO SPAM" form.
To decode it, remove _NOSPAM_ . DO NOT REPLY TO THIS MESSAGE,
unless you want back a "recipient not found" feedback :-))
-----------------------------------------------------------
PriorityAppender.java ------------------------------
import org.log4j.*;
import org.log4j.spi.*;
import java.util.HashMap;
import java.util.Iterator;
/**
* (2000) Marco Brandizi
*
* This code is free and to be intended as covered by the principles
stated in
* GNU LGPL
*
* An appender used for associate an appender to each priority type, in
the same
* logging category, i.e.: You may send messages of cat C to
C-errors.log
* C-warn.logs, etc
*
*/
public class PriorityAppender implements Appender {
private HashMap appenders = new HashMap();
private String name = "PriorityAppender";
/** Adds an appender, associated to a priority, if p already had one,
throws it away */
public void addAppender ( Priority p, Appender a )
{
Appender old = (Appender) appenders.get ( p );
if ( old == a )
// Hey, it's the same!
return;
else if (old != null )
// Release the old one
old.close();
else
// Append new
appenders.put (p, a);
}
/** null if p isn't correct */
public Appender getAppender ( Priority p )
{
return (Appender) appenders.get (p);
}
/** Appenders are removed at end */
protected void removeAppenders ()
{
Iterator iA = appenders.values().iterator();
Appender a;
while ( iA.hasNext() )
((Appender)iA.next()).close();
appenders = null;
}
/** Does nothing, I don't need them here... */
public void addFilter(Filter newFilter) {
}
/** Does nothing, I don't need them here... */
public void clearFilters() {
}
public void close() {
removeAppenders();
}
/** Switch the priority and forward to the proper appender */
public void doAppend(LoggingEvent event) {
Appender a = getAppender ( event.priority );
a.doAppend(event);
}
/** Default is "PriorityAppender" */
public String getName() {
return name;
}
/** Does nothing, I don't need them here... */
public void setErrorHandler(ErrorHandler errorHandler) {
}
/** Does nothing, I don't need them here... */
public void setLayout(Layout layout) {
}
public void setName(String name) {
this.name = name;
}
/** FALSE! */
public boolean requiresLayout() {
return false;
}
}
-----------------------------------------------------------
PriorityFileAppender.java ------------------------------
import org.log4j.*;
import org.log4j.spi.*;
import java.util.HashMap;
import java.util.Iterator;
import java.io.IOException;
/**
* (2000) Marco Brandizi
*
* This code is free and to be intended as covered by the principles
stated in
* GNU LGPL
*
* It's like PriorityAppender, but specific for file appenders.
* <P>Note: to assign different kind of appenders, start by this class,
copyng its
* code and redefining another one
* (ex: public class PriorityRollingFileAppender extends
PriorityAppender ...)
*/
public class PriorityFileAppender extends PriorityAppender {
/**
Adds a FileAppender for standard priorities ( err, warn, nfo, debug
),
setting prefix + priority.getString().toLowerCase() + postfix as
file name
*/
public PriorityFileAppender (Layout l, String prefix, String postfix,
boolean append )
throws IOException
{
Priority[] prs = new Priority []
{ Priority.ERROR, Priority.WARN, Priority.INFO, Priority.DEBUG };
for ( int i = 0; i < prs.length; i++ )
{
Appender a =
new FileAppender ( l, prefix + prs[i].toString().toLowerCase() +
postfix, append);
addAppender ( prs[i], a );
}
}
/**
Create the appender, without appenders, to be set manually
*/
public PriorityFileAppender ()
throws IOException
{
}
/**
Adds a FileAppender for all priorities returned by
Priority.getAllPossiblePriorities(),
setting prefix + priority.getString().toLowerCase + postfix as file
name
*/
public void addAllAppenders (Layout l, String prefix, String postfix,
boolean append)
throws IOException
{
Priority[] prs = Priority.getAllPossiblePriorities();
for ( int i = 0; i < prs.length; i++ )
{
Appender a =
new FileAppender ( l, prefix + prs[i].toString().toLowerCase() +
postfix, append );
addAppender ( prs[i], a );
}
}
}
-----------------------------------------------------------
testPriorityFileAppender.java ------------------------------
import org.log4j.*;
import java.io.*;
/**
* (2000) Marco Brandizi
*
* This code is free and to be intended as covered by the principles
stated in
* GNU LGPL
*
* A test with PriorityFileAppender
*/
public class testPriorityFileAppender {
public static void main(String[] args) {
Category cat = Category.getRoot();
try
{
cat.addAppender(
new PriorityFileAppender (
new PatternLayout( "%-5p [%t]: %m%n" ) , "/temp/testPri-",
".log", false )
);
cat.info ("Hello!");
for ( int i = 0; i < 10; i++ )
cat.warn("Doing the " + i + " iteration of my stupid
loop...");
cat.info ( "Done, bye-bye" );
}
catch ( IOException ex )
{
ex.printStackTrace();
}
}
}
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Where can I find more info on Appenders.
Posted by Wilmer Hernandez <wi...@kinek.com>.
Hi there,
I would like to now if there is place where I can find more information on how
to extend appenders. I'm trying to create an appender that writes to a database
table. If there is an appender that already does that, I would be interested in
checking it out.
Thanks in advance.
Re: Dispatching messages to different files on the basis of
priorities
Posted by Ceki Gülcü <cg...@qos.ch>.
At 09:16 11.05.2001 +0200, Marco Brandizi wrote:
>Hello,
>
>I'm an happy user of Log4J. I didn't understand if in new 1.6b version
>is avaible a "Priority Appender". I mean: an appender able to dispatch
>received messages to several destinations, one per each priority level.
You can attach multiple appenders to a category. In addition, filters can be added to appenders.
>I already have developed classes to do that (one generic and one child,
>specific for files), which you find attached to this message, but still
>I have to develop the XML configuration part, which is very important
>for the context where I use them. If someone already has something
>alike, would be welcome ;-)
Assuming you errors to go error.log and debug output to go debug.log, you could add two file appenders to the root category and attach a filter allowing only errors in the first and only debugs in the second. See org.apache.log4j.varia.PriorityMatchFilter and org.apache.log4j.varia.PriorityRangeFilter.
>Please, answer me privately too, not only in the mailing list, otherwise
>I could forget it... ;-)
>
>Greetings
I have a few comments on your code. They are prefixed by \\\.
>-----------------------------------------------------------
>PriorityAppender.java ------------------------------
>
>import org.log4j.*;
>import org.log4j.spi.*;
>import java.util.HashMap;
>import java.util.Iterator;
>
>
>/**
> * (2000) Marco Brandizi
> *
> * This code is free and to be intended as covered by the principles
>stated in
> * GNU LGPL
> *
> * An appender used for associate an appender to each priority type, in
>the same
> * logging category, i.e.: You may send messages of cat C to
>C-errors.log
> * C-warn.logs, etc
> *
> */
\\\ We can only accept contributions that are under the Apache
\\\ Software License. LGPL is a no-no.
>public class PriorityAppender implements Appender {
\\\ You should have implemented the AppanderAttachable interface.
\\\ See for example the AsyncAppender.
> private HashMap appenders = new HashMap();
\\\ HashMap was introduced in JDK 1.2. Log4j requires JDK 1.1 compatibility.
> private String name = "PriorityAppender";
>
> /** Adds an appender, associated to a priority, if p already had one,
> throws it away */
> public void addAppender ( Priority p, Appender a )
> {
>
> Appender old = (Appender) appenders.get ( p );
>
> if ( old == a )
> // Hey, it's the same!
> return;
> else if (old != null )
> // Release the old one
> old.close();
> else
> // Append new
> appenders.put (p, a);
> }
>
> /** null if p isn't correct */
> public Appender getAppender ( Priority p )
> {
> return (Appender) appenders.get (p);
> }
>
> /** Appenders are removed at end */
> protected void removeAppenders ()
> {
> Iterator iA = appenders.values().iterator();
> Appender a;
> while ( iA.hasNext() )
> ((Appender)iA.next()).close();
> appenders = null;
> }
>
>
> /** Does nothing, I don't need them here... */
> public void addFilter(Filter newFilter) {
> }
>
> /** Does nothing, I don't need them here... */
> public void clearFilters() {
> }
>
> public void close() {
> removeAppenders();
> }
>
> /** Switch the priority and forward to the proper appender */
> public void doAppend(LoggingEvent event) {
> Appender a = getAppender ( event.priority );
> a.doAppend(event);
> }
>
> /** Default is "PriorityAppender" */
> public String getName() {
> return name;
> }
>
> /** Does nothing, I don't need them here... */
> public void setErrorHandler(ErrorHandler errorHandler) {
> }
>
> /** Does nothing, I don't need them here... */
> public void setLayout(Layout layout) {
> }
>
> public void setName(String name) {
> this.name = name;
> }
>
> /** FALSE! */
> public boolean requiresLayout() {
> return false;
> }
>
>}
\\\ That's it.
Regards, Ceki
--
Ceki Gülcü
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