I have a program that once started, it will executed a flow (few classes involved) several times - each in a different thread. The flow is the same - just different parameters sent to it each time it is invoked.
Each flow will execute on its own thread.
I want to be able to define a file appender (essentially file log) for each thread - so once a flow starts, it programmatically creates its own log file and writes to it.
Searched for it but couldnt find a simple solution for it Can you help?
Ta
You can do this programmatically. e.g.:
class Task implements Runnable {
private final String path;
private final String name;
public Task(String path, String name) {
this.path = path;
this.name = name;
}
public void run() {
// Create file appender
FileAppender appender = new FileAppender();
appender.setFile(path);
appender.setLayout(new PatternLayout("%d [%t] %-5p %c - %m%n"));
appender.activateOptions();
// Get logger and add appender
Logger logger = Logger.getLogger(name);
logger.setAdditivity(false);
logger.addAppender(appender);
// Task
logger.info("Hello World!");
// Remove appender
logger.removeAppender(appender);
}
}
public static void main(String[] args) {
new Thread(new Task("logs/A.log", "com.company.A")).start();
new Thread(new Task("logs/B.log", "com.company.B")).start();
}
Define handlers for each log file in the log4j file, for example, this way:
Now add something like this in the same xml file:
<logger category="a.b.c.d">
<level name="INFO"/>
<handlers>
<handler name="a.b.c.d_FILE"/>
</handlers>
Maybe one of those solutions would fit your requirements
There some others on http://stackoverflow.com ;-)
You can implement it by yourself:
RandomAccessFile logfile;
public void initLogger(String logPath) {
File fl = new File(logPath);
long fileLength = fl.length();
logfile = new RandomAccessFile(fl, "rw");
logfile.seek(fileLength);
}
public void log(String text) throws IOException {
logfile.writeChars(text);
logfile.writeChar('\n');
}
