Question

Is java.util.logging.Logger.log() is a chain of responsibility pattern?If so how log method call is getting chained for the next call?

Answer 1

Here is the relevant code:

// Post the LogRecord to all our Handlers, and then to
// our parents' handlers, all the way up the tree.

Logger logger = this;
while (logger != null) {
    Handler targets[] = logger.getHandlers();

    //...

    if (!logger.getUseParentHandlers()) {
      break;
    }

    logger = logger.getParent();
}
}

As you can see each logging record is passed to every Handler assigned to a given logger and, if useParentHandlers is true, the same algorithm is applied to parent all the way up to the top.

So essentially this is a chain of responsibility pattern where each element in the chain might handle piece of the request.