Initial Commit

lib/apscheduler/schedulers/tornado.py

@@ -0,0 +1,60 @@
+from __future__ import absolute_import
+from datetime import timedelta
+from functools import wraps
+
+from apscheduler.schedulers.base import BaseScheduler
+from apscheduler.util import maybe_ref
+
+try:
+    from tornado.ioloop import IOLoop
+except ImportError:  # pragma: nocover
+    raise ImportError('TornadoScheduler requires tornado installed')
+
+
+def run_in_ioloop(func):
+    @wraps(func)
+    def wrapper(self, *args, **kwargs):
+        self._ioloop.add_callback(func, self, *args, **kwargs)
+    return wrapper
+
+
+class TornadoScheduler(BaseScheduler):
+    """
+    A scheduler that runs on a Tornado IOLoop.
+
+    =========== ===============================================================
+    ``io_loop`` Tornado IOLoop instance to use (defaults to the global IO loop)
+    =========== ===============================================================
+    """
+
+    _ioloop = None
+    _timeout = None
+
+    def start(self):
+        super(TornadoScheduler, self).start()
+        self.wakeup()
+
+    @run_in_ioloop
+    def shutdown(self, wait=True):
+        super(TornadoScheduler, self).shutdown(wait)
+        self._stop_timer()
+
+    def _configure(self, config):
+        self._ioloop = maybe_ref(config.pop('io_loop', None)) or IOLoop.current()
+        super(TornadoScheduler, self)._configure(config)
+
+    def _start_timer(self, wait_seconds):
+        self._stop_timer()
+        if wait_seconds is not None:
+            self._timeout = self._ioloop.add_timeout(timedelta(seconds=wait_seconds), self.wakeup)
+
+    def _stop_timer(self):
+        if self._timeout:
+            self._ioloop.remove_timeout(self._timeout)
+            del self._timeout
+
+    @run_in_ioloop
+    def wakeup(self):
+        self._stop_timer()
+        wait_seconds = self._process_jobs()
+        self._start_timer(wait_seconds)