Disk cache: First pass to make it possible to have...

net/disk_cache/backend_impl.h

 // Copyright (c) 2006-2008 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/timer.h"
 #include "net/disk_cache/block_files.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/eviction.h"
 #include "net/disk_cache/rankings.h"
 #include "net/disk_cache/stats.h"
 #include "net/disk_cache/trace.h"
 
 namespace disk_cache {
 
 // This class implements the Backend interface. An object of this
 // class handles the operations of the cache for a particular profile.
 class BackendImpl : public Backend {
   friend class Eviction;
  public:
   explicit BackendImpl(const std::wstring& path)
-      : path_(path), block_files_(path), mask_(0), max_size_(0), init_(false),
+      : path_(path), block_files_(path), mask_(0), max_size_(0),
+        cache_type_(net::DISK_CACHE), uma_report_(0), init_(false),
         restarted_(false), unit_test_(false), read_only_(false),
-        new_eviction_(false) {}
+        new_eviction_(false), first_timer_(true) {}
   // mask can be used to limit the usable size of the hash table, for testing.
   BackendImpl(const std::wstring& path, uint32 mask)
       : path_(path), block_files_(path), mask_(mask), max_size_(0),
-        init_(false), restarted_(false), unit_test_(false), read_only_(false),
-        new_eviction_(false) {}
+        cache_type_(net::DISK_CACHE), uma_report_(0), init_(false),
+        restarted_(false), unit_test_(false), read_only_(false),
+        new_eviction_(false), first_timer_(true) {}
   ~BackendImpl();
 
   // Performs general initialization for this current instance of the cache.
   bool Init();
 
   // Backend interface.
   virtual int32 GetEntryCount() const;
   virtual bool OpenEntry(const std::string& key, Entry** entry);
   virtual bool CreateEntry(const std::string& key, Entry** entry);
   virtual bool DoomEntry(const std::string& key);
   virtual bool DoomAllEntries();
   virtual bool DoomEntriesBetween(const base::Time initial_time,
                                   const base::Time end_time);
   virtual bool DoomEntriesSince(const base::Time initial_time);
   virtual bool OpenNextEntry(void** iter, Entry** next_entry);
   virtual void EndEnumeration(void** iter);
   virtual void GetStats(StatsItems* stats);
 
   // Sets the maximum size for the total amount of data stored by this instance.
   bool SetMaxSize(int max_bytes);
 
+  // Sets the cache type for this backend.
+  void SetType(net::CacheType type);
+
   // Returns the full name for an external storage file.
   std::wstring GetFileName(Addr address) const;
 
   // Returns the actual file used to store a given (non-external) address.
   MappedFile* File(Addr address);
 
   // Creates an external storage file.
   bool CreateExternalFile(Addr* address);
 
   // Creates a new storage block of size block_count.
@@ skipping 144 matching lines @@
   std::wstring path_;  // Path to the folder used as backing storage.
   Index* data_;  // Pointer to the index data.
   BlockFiles block_files_;  // Set of files used to store all data.
   Rankings rankings_;  // Rankings to be able to trim the cache.
   uint32 mask_;  // Binary mask to map a hash to the hash table.
   int32 max_size_;  // Maximum data size for this instance.
   Eviction eviction_;  // Handler of the eviction algorithm.
   int num_refs_;  // Number of referenced cache entries.
   int max_refs_;  // Max number of referenced cache entries.
   int num_pending_io_;  // Number of pending IO operations.
+  net::CacheType cache_type_;
+  int uma_report_;  // Controls transmision of UMA data.
   bool init_;  // controls the initialization of the system.
   bool restarted_;
   bool unit_test_;
   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.
-  TraceObject trace_object_;  // Inits and destroys internal tracing.
+  scoped_refptr<TraceObject> trace_object_;  // Inits internal tracing.
 
   DISALLOW_EVIL_CONSTRUCTORS(BackendImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BACKEND_IMPL_H_