Disk Cache: Replace the backend pointer of the ChildrenDeleter...

net/disk_cache/backend_impl.h

 // Copyright (c) 2006-2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
 #ifndef NET_DISK_CACHE_BACKEND_IMPL_H_
 #define NET_DISK_CACHE_BACKEND_IMPL_H_
 
 #include "base/file_path.h"
@@ skipping 24 matching lines @@
 // class handles the operations of the cache for a particular profile.
 class BackendImpl : public Backend {
   friend class Eviction;
  public:
   BackendImpl(const FilePath& path, base::MessageLoopProxy* cache_thread)
       : ALLOW_THIS_IN_INITIALIZER_LIST(background_queue_(this, cache_thread)),
         path_(path), block_files_(path), mask_(0), max_size_(0),
         cache_type_(net::DISK_CACHE), uma_report_(0), user_flags_(0),
         init_(false), restarted_(false), unit_test_(false), read_only_(false),
         new_eviction_(false), first_timer_(true), done_(true, false),
-        ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) {}
+        ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)),
+        ALLOW_THIS_IN_INITIALIZER_LIST(ptr_factory_(this)) {}
   // mask can be used to limit the usable size of the hash table, for testing.
   BackendImpl(const FilePath& path, uint32 mask,
               base::MessageLoopProxy* cache_thread)
       : ALLOW_THIS_IN_INITIALIZER_LIST(background_queue_(this, cache_thread)),
         path_(path), block_files_(path), mask_(mask), max_size_(0),
         cache_type_(net::DISK_CACHE), uma_report_(0), user_flags_(kMask),
         init_(false), restarted_(false), unit_test_(false), read_only_(false),
         new_eviction_(false), first_timer_(true), done_(true, false),
-        ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) {}
+        ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)),
+        ALLOW_THIS_IN_INITIALIZER_LIST(ptr_factory_(this)) {}
   ~BackendImpl();
 
   // Returns a new backend with the desired flags. See the declaration of
   // CreateCacheBackend().
   static int CreateBackend(const FilePath& full_path, bool force,
                            int max_bytes, net::CacheType type,
                            uint32 flags, base::MessageLoopProxy* thread,
                            Backend** backend, CompletionCallback* callback);
 
   // Performs general initialization for this current instance of the cache.
@@ skipping 112 matching lines @@
 
   // Returns the full histogram name, for the given base |name| and experiment,
   // and the current cache type. The name will be "DiskCache.t.name_e" where n
   // is the cache type and e the provided |experiment|.
   std::string HistogramName(const char* name, int experiment) const;
 
   net::CacheType cache_type() const {
     return cache_type_;
   }
 
+  // Returns a weak pointer to this object.
+  base::WeakPtr<BackendImpl> GetWeakPtr() {
+    return ptr_factory_.GetWeakPtr();
+  }
+
   // Returns the group for this client, based on the current cache size.
   int GetSizeGroup() const;
 
   // Returns true if we should send histograms for this user again. The caller
   // must call this function only once per run (because it returns always the
   // same thing on a given run).
   bool ShouldReportAgain();
 
   // Reports some data when we filled up the cache.
   void FirstEviction();
@@ skipping 133 matching lines @@
   bool read_only_;  // Prevents updates of the rankings data (used by tools).
   bool disabled_;
   bool new_eviction_;  // What eviction algorithm should be used.
   bool first_timer_;  // True if the timer has not been called.
 
   Stats stats_;  // Usage statistcs.
   base::RepeatingTimer<BackendImpl> timer_;  // Usage timer.
   base::WaitableEvent done_;  // Signals the end of background work.
   scoped_refptr<TraceObject> trace_object_;  // Inits internal tracing.
   ScopedRunnableMethodFactory<BackendImpl> factory_;
+  base::WeakPtrFactory<BackendImpl> ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackendImpl);
 };
 
 // Returns the prefered max cache size given the available disk space.
 int PreferedCacheSize(int64 available);
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BACKEND_IMPL_H_