Add expiration_time property on MemcachedPlugin to support expiration feature

of memcached protocol.
Extend MemcahedTool and MemcachedDict API to handle expiration_time parameter.
Note that CacheTool implement this feature through CacheEntry API.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34779 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/CachePlugins/DistributedRamCache.py

@@ -57,6 +57,7 @@ class DistributedRamCache(BaseCache):
 
   def __init__(self, params={}):
     self._servers = params.get('server', '')
+    self._expiration_time = params.get('expiration_time', 0)
     self._server_max_key_length = params.get('server_max_key_length', 250)
     self._server_max_value_length = params.get('server_max_value_length', 1024*1024)
     self._debug_level = params.get('debug_level', 0)
@@ -71,7 +72,8 @@ class DistributedRamCache(BaseCache):
   def _getMemcachedDict(self):
     """return a threading safe MemcachedDict instance
     """
-    configuration_key = (self._servers, self._server_max_key_length,
+    configuration_key = (self._servers, self._expiration_time,
+                         self._server_max_key_length,
                          self._server_max_value_length,
                          self._debug_level, self._key_prefix)
     try:

product/ERP5Type/PropertySheet/MemcachedPlugin.py

@@ -44,5 +44,11 @@ class MemcachedPlugin:
          'default'     :  1048576,
          'mode'        : 'w' ,
         },
+        {'id'          : 'expiration_time',
+         'description' : 'Time to live of stored value (in second)',
+         'type'        : 'int',
+         'default'     :  0,
+         'mode'        : 'w' ,
+        },
         )
 

product/ERP5Type/Tool/CacheTool.py

@@ -89,6 +89,7 @@ class CacheTool(BaseTool):
               server = memcached_plugin.getUrlString('')
               init_dict = {
                 'server': server,
+                'expiration_time': cf.getCacheDuration(),
                 'server_max_key_length': memcached_plugin.getServerMaxKeyLength(),
                 'server_max_value_length': memcached_plugin.getServerMaxValueLength(),
                 'key_prefix': getattr(self, 'erp5_site_global_id', '')

product/ERP5Type/Tool/MemcachedTool.py

@@ -75,8 +75,8 @@ if memcache is not None:
         - make picklable ?
     """
 
-    def __init__(self, server_list=('127.0.0.1:11211',), server_max_key_length=MARKER,
-                 server_max_value_length=MARKER):
+    def __init__(self, server_list=('127.0.0.1:11211',), expiration_time=0,
+                 server_max_key_length=MARKER, server_max_value_length=MARKER):
       """
         Initialise properties :
         memcached_connection
@@ -96,6 +96,7 @@ if memcache is not None:
       self.scheduled_action_dict = {}
       init_dict = {}
       self.server_list = server_list
+      self.expiration_time = expiration_time
       if server_max_key_length is not MARKER:
         init_dict['server_max_key_length'] = server_max_key_length
       if server_max_value_length is not MARKER:
@@ -122,7 +123,9 @@ if memcache is not None:
             self.scheduled_action_dict[key] = UPDATE_ACTION
         for key, action in self.scheduled_action_dict.iteritems():
           if action is UPDATE_ACTION:
-            succeed = self.memcached_connection.set(encodeKey(key), self.local_cache[key], 0)
+            succeed = self.memcached_connection.set(encodeKey(key),
+                                                    self.local_cache[key], 
+                                                    self.expiration_time)
             if not succeed:
               LOG('MemcacheTool', 0, 'set command to memcached server (%r) failed' % (self.server_list,))
           elif action is DELETE_ACTION:
@@ -289,6 +292,7 @@ if memcache is not None:
         if memcached_plugin is None:
           raise ValueError, 'Memcached Plugin does not exists: %r' % (plugin_path,)
         dictionary = MemcachedDict((memcached_plugin.getUrlString(''),),
+                   expiration_time=memcached_plugin.getExpirationTime(),
                    server_max_key_length=memcached_plugin.getServerMaxKeyLength(),
                    server_max_value_length=memcached_plugin.getServerMaxValueLength())
         local_dict[plugin_path] = dictionary