initial upload

smmapd_prototype/Cache.py

@@ -0,0 +1,37 @@
+import threading
+import time
+
+from Logging import *
+
+
+
+class Cache(object):
+    def __init__(self, expiration):
+        self.lock = threading.Lock()
+        self.expiration = expiration
+        self.cache = {}
+
+    def put(self, key, value):
+        self.lock.acquire()
+        self.cache[key] = (time.time(), value)
+        debug("cache.put(%s, %s)" % (str(key), str(value)))
+        self.lock.release()
+
+    def get(self, key):
+        try:
+            self.lock.acquire()
+            debug("cache.get(%s)" % str(key))
+            try:
+                timestamp, value = self.cache[key]
+                debug("cache.get found: %s" % value)
+                if (timestamp + self.expiration) < time.time():
+                    debug("cache.get: expired")
+                    del self.cache[key]
+                    raise KeyError
+                return value
+            except KeyError:
+                debug("cache.get: found nothing")
+                return None
+        finally:
+            self.lock.release()
+