writing price publisher using coop/threading models

--HG--
branch : sandbox

src/circuits/primes.py

@@ -0,0 +1,86 @@
+# Copyright 2010 baloan
+# See LICENSE for details.
+
+''' multiprocessing demo '''
+
+# system imports
+
+from circuits import Component, Event, Timer, handler, Debugger
+from math import sqrt
+import logging
+
+# globals
+
+LOG = logging.getLogger()
+
+logging.basicConfig(level=logging.DEBUG,
+                    format='%(asctime)s.%(msecs)03d %(process)d:%(thread)d %(levelname).4s %(message)s',
+                    datefmt='%H:%M:%S')
+
+# definitions
+
+class Print(Event):
+    'Print Event'
+
+class Timeout(Event):
+    'Timeout'
+
+
+class Input(Component):
+    def started(self, component, mode):
+        LOG.info('started %s %s', component, mode)
+        for n in range(100):
+            LOG.info('put %i', n)
+            self.push(Event(n))
+        LOG.info('worker done, ending')
+        Timer(5, Timeout('msg'), "timeout").register(self)
+
+    def timeout(self, e):
+        LOG.info("timeout %s", e)
+        self.stop()
+    
+    def stopped(self, e):
+        pass
+
+
+class Filter(Component):
+    def started(self, component, mode):
+        LOG.info('started %s %s', component, mode)
+
+    def event(self, n):
+        LOG.info('Filter:event %i', n)
+        if self.is_prime(n):
+            LOG.info('Filter: sending %i', n)
+            self.push(Print(n))
+
+    def is_prime(self, n):
+        if n < 2:
+            return False
+        if n in (2, 3):
+            return True
+        for i in range(2, int(sqrt(n)) + 1):
+            if n % i == 0:
+                return False
+        return True
+
+
+class Output(Component):
+    def started(self, component, mode):
+        LOG.info('started %s %s', component, mode)
+
+    @handler('print')
+    def onPrint(self, n):
+        print '%i, ' % (n,),
+
+
+def runInline():
+    master = Input()
+    master += Filter()
+    master += Output()
+    master += Debugger()
+    master.run()
+    LOG.info('done.')
+
+if __name__ == '__main__':
+    runInline()
+