HomeIntroduction
Welcome to the home of Chainsaw v2!
Chainsaw v2 is a companion application to Log4j written by members of the Log4j development community. Like a number of Open Source projects, this new version was built upon inspirations, ideas and creations of others. Chainsaw v2 has it's roots from the original Chainsaw utility written by Oliver Burn, and with inspiration from the Log Factor 5 utility contributed by ThoughtWorks Inc.
Available Distributions
Java Web Start
Standalone -.sh/.bat
OS X 'native' distribution (uses Java still, but looks like a real OSX application)
Click Download link for more information.
So what is it really?
Heres just a brief run down of some of the features of Chainsaw v2:
View remote events - Remote events are "received" by Chainsaw using Log4j 1.3's new Receiver concept.
Saved Preferences - You can fully customize each Tab the way you want it, and it will restore it's state the next time.
Responsive - When events are screaming in, you don't want the GUI to meltdown. You can control how responsive the GUI is and determine the frequency of updates.
Tabs/Docking - Chainsaw routes separate applications/remote hosts' events to a unique Tab within the GUI. These tabs can be undocked from the main window. Using these features you can manage multiple application logs using the one GUI.
Coloring - You can specify your own rules to color each event row depending on the attributes of a LoggingEvent to help you locate important events.
Dynamic and powerful filtering - Helps you locate stuff. There's support for quick-and-dirty filtering, right through to advanced expression-based filtering (e.g. "LOGGER == 'com.mycompany' && LEVEL == ERROR" ).
Cyclic - A tab view can support a Cyclic-based model, which constrains it's view to the last X events, ensuring you don't hog memory. This is great for monitoring live applications.
Built-in documentation and tutorial - HTML-based documentation included in the package.
SO HOW DO WE GET THIS THING ONTO THE BUG ?
You can download chainsaw by itself here :
http://logging.apache.org/chainsaw/download.html
but if you intend to use it along with log4j and since you will probably also need to make a connection to a remote machine for viewing the logs,you may just download this log4j package that comes along with cahinsaw
and other goodies such as log4j.net that is useful for remote connection.
http://www.apache.org/dyn/closer.cgi/logging/log4j/1.2.15/apache-log4j-1.2.15.zip
In ether case, locate the jar file copy it to your project and add it to your project class path.
SETTING UP THE STAGE ON THE BUG .
Add the missing lines to your activator class:
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
import org.apache.log4j.RollingFileAppender;
import org.apache.log4j.net.*;
public class Activator implements BundleActivator {
Logger activ = Logger.getLogger(Activator.class); // activator Logger
public static FileAppender log;
public static SocketAppender chainsaw_output;
/**
* This fonction only runs once when the application starts and sets up
* all that is required on the activator side..
*/
static {
BasicConfigurator.configure(); // allows standard output
try {
log = new RollingFileAppender(new PatternLayout("%r [%t] %-5p %c - %m%n"), "out.log");
chainsaw_output = new SocketAppender("127.0.0.1", 4445);// (“IP”,Port#)
} catch (IOException e) {e.printStackTrace();}
}
public Activator(){
LoggerRepository repository = activ.getLoggerRepository();
repository.setThreshold(Level.ALL);
activ.addAppender(log);
activ.addAppender(chainsaw_output); //allow the logs to be also sent to chainsaw
activ.debug("LOG4J activ Initialisation completed . . . ");
}
public void start(BundleContext context) throws Exception {
//Create the service tracker and run it.
stc = new log4jExampleServiceTracker(context);
Filter f = context.createFilter(ServiceFilterGenerator.generateServiceFilter(stc.getServices()));
st = new ServiceTracker(context, f, stc);
st.open();
activ.info("activator doing start");
}
}
since chainsaw_output is visible from anywhere within this project , you can send other logs to it by doing from other classes:
myOwnLogger.addAppender(projectName.Activator.chainsaw_output);
here is an example from my Service tracker class.
package log4jexample.servicetracker;
/**
* Generated by Dragonfly SDK
*/
import java.io.IOException;
import com.buglabs.bug.module.lcd.pub.IModuleDisplay;
import org.apache.log4j.Logger;
import org.osgi.framework.BundleContext;
import com.buglabs.application.AbstractServiceTracker;
import log4jexample.app.*;
public class log4jExampleServiceTracker extends AbstractServiceTracker {
private IModuleDisplay display;
final static Logger str = Logger.getLogger(log4jExampleServiceTracker.class);
public log4jExampleServiceTracker(BundleContext context) {
super(context);
str.addAppender(log4jexample.Activator.log);
str.addAppender(log4jexample.Activator.chainsaw_output);
str.debug("LOG4J str Initialisation completed . . . ");
}
public boolean canStart() {
str.info("doing can start");
return super.canStart();
}
public void doStart() {
str.info("starting doStart()");
System.out.println("log4jExampleServiceTracker: start");
display = (IModuleDisplay) getService(IModuleDisplay.class);
log4jExampleApp app;
app = new log4jExampleApp(display);
str.info("exiting doStart()");
}
public void doStop() {
System.out.println("log4jExampleServiceTracker: stop");
}
public void initServices() {
str.info("Setting up Services");
getServices().add("com.buglabs.bug.module.lcd.pub.IModuleDisplay");
}
}
this will allow the logs fro your own loggers from other classes to directly print into the chainsaw_output and be viewed on a remote machine.
The remote machine
in order to view the log on a remote machine, you need to have the chainsaw viewer installed and running.
You can get a copy of it at:
http://sourceforge.net/projects/logui/files/chainsaw/1.1/chainsaw-1.1.zip/download
unzip the file
locate chainsaw.sh
make it executable chmod 777 chainsaw.sh
then to lunch it just ./chainsaw.sh into the terminal given that you have it in your path.
Once you have the viewer running, consult the Built-in documentation and tutorial for more in dept information on how to use all the different features of chainsaw.
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