Added len() method to WriteBackCacheManager.

2 files changed, 11 insertions, 0 deletions

diff --git a/README.txt b/README.txt
index f37c9cc..3c84aa9 100644
--- a/README.txt
+++ b/README.txt
@@ -183,6 +183,13 @@ Similar to the WriteThroughCacheManager class except write-back semantics are us
     cached.size(x)      # Changes the size of the cache. x MUST be greater than
                         # zero. Returns the new size x.
 
+    x = len(cached)     # Returns the number of items stored in the store.
+                        #
+                        # WARNING - This method calls sync() internally. If
+                        # that has adverse performance effects for your
+                        # application, you may want to avoid calling this
+                        # method frequently.
+
     cached.clear()      # Remove all items from the store and cache.
     
     cached.sync()       # Make the store and cache consistent. Write all
diff --git a/pylru.py b/pylru.py
index 0a9bf11..1b5bb88 100644
--- a/pylru.py
+++ b/pylru.py
@@ -370,6 +370,10 @@ class WriteBackCacheManager(object):
     def size(self, size=None):
         return self.cache.size(size)
 
+    def len(self):
+        self.sync()
+        return len(self.store)
+
     def clear(self):
         self.cache.clear()
         self.dirty.clear()