Popular recipes tagged "daemon" but not "process"

Consumer Application Skeleton (Python)

2015-06-30T03:24:07-07:00

Python recipe 579074 by Vovan (application, consumer, daemon, framework). Revision 2.

Consumer Application Skeleton

This is very basic skeleton for data processing application implementing consumer pattern:

while is_running():
    task = get_next_task_from_queue()
    if task:
        submit_task_for_processing(task)
    else:
        sleep_for_a_moment()

Here's an example:

class ExampleApp(ConsumerAppBase):

    def _get_next_task(self):

        # Get next task from the queue.
        return self._queue.next()

    def _run_task(self, task):

        # This code's being executed in separate worker thread of
        # ThreadPoolExecutor
        return task / 2

    def _on_task_done(self, task, future):

        # Once worker thread finished - task results are available
        # in _on_task_done() callback as a concurrent.futures.Future object.
        self._log.info('Task done. Result: %s', future.result())

Context manager for a daemon pid file (Python)

2013-10-07T21:03:30-07:00

Python recipe 577911 by Graham Poulter (daemon, pid). Revision 3.

Context manager for a pid (process id) file used to tell whether a daemon process is still running.

On entry, it writes the pid of the current process to the path. On exit, it removes the file.

Designed to work with python-daemon.

logging support for python daemon (Python)

2010-10-25T15:22:18-07:00

Python recipe 577442 by Bud P. Bruegger (daemon, logging).

The recipe shows how to subclass python-daemon's [1] DaemonContext to add logging support. In particular, it is possible to ask to keep the files related to a list of loggers (loggers_preserve) open and to redirect stdout and stderr to a logger (e.g., one using a RotatingFileHandler).

[1] See http://pypi.python.org/pypi/python-daemon/