Changed tweets, added eca

demos/advancedcontexts.py

@@ -0,0 +1,56 @@
+from eca import *
+import random
+
+# declare two separate rule sets
+
+consumer = Rules()
+producer = Rules()
+
+
+# default init
+
+@event('init')
+def bootstrap(c, e):
+    # start a few contexts for the generation of stock quotes
+    # (The simple workload here can easily be done in a single context, but we
+    # do this in separate contexts to give an example of the feature.)
+    spawn_context({'symbol':'GOOG', 'start':500.0, 'delay':1.2}, rules=producer, daemon=True)
+    spawn_context({'symbol':'AAPL', 'start':99.0, 'delay':0.9}, rules=producer, daemon=True)
+    spawn_context(rules=consumer, daemon=True)
+
+@event('end-of-input')
+def done(c,e):
+    # terminate if the input is closed
+    shutdown()
+
+
+# producer rules 
+
+@producer.event('init')
+def start_work(c, e):
+    c.symbol = e.data['symbol']
+    c.delay = e.data['delay']
+
+    fire('sample', {
+        'previous': e.data['start']
+    })
+
+@producer.event('sample')
+def work(c, e):
+    current = e.data['previous'] + random.uniform(-0.5, 0.5)
+
+    fire_global('quote', {
+        'symbol': c.symbol, 
+        'value': current
+    })
+
+    fire('sample', {
+        'previous': current
+    }, delay=c.delay)
+
+
+# consumer rules
+
+@consumer.event('quote')
+def show_quote(c, e):
+    print("Quote for {symbol}: {value}".format(**e.data))