Disk cache: Add support for an extra data stream for each cache entry....

net/disk_cache/entry_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.
 
 #ifndef NET_DISK_CACHE_ENTRY_IMPL_H__
 #define NET_DISK_CACHE_ENTRY_IMPL_H__
 
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/storage_block.h"
 #include "net/disk_cache/storage_block-inl.h"
@@ skipping 71 matching lines @@
 
   // Handle the pending asynchronous IO count.
   void IncrementIoCount();
   void DecrementIoCount();
 
   // Set the access times for this entry. This method provides support for
   // the upgrade tool.
   void SetTimes(base::Time last_used, base::Time last_modified);
 
  private:
+   enum {
+     NUM_STREAMS = 3
+   };
+
   ~EntryImpl();
 
-  // Index for the file used to store the key, if any (files_[kKeyFileIndex]).
-  static const int kKeyFileIndex = 2;
-
   // Initializes the storage for an internal or external data block.
   bool CreateDataBlock(int index, int size);
 
   // Initializes the storage for an internal or external generic block.
   bool CreateBlock(int size, Addr* address);
 
   // Deletes the data pointed by address, maybe backed by files_[index].
   void DeleteData(Addr address, int index);
 
   // Updates ranking information.
@@ skipping 20 matching lines @@
 
   // Flush the in-memory data to the backing storage.
   bool Flush(int index, int size, bool async);
 
   // Logs this entry to the internal trace buffer.
   void Log(const char* msg);
 
   CacheEntryBlock entry_;     // Key related information for this entry.
   CacheRankingsBlock node_;   // Rankings related information for this entry.
   BackendImpl* backend_;      // Back pointer to the cache.
-  scoped_array<char> user_buffers_[2];  // Store user data.
-  scoped_refptr<File> files_[3];  // Files to store external user data and key.
-  int unreported_size_[2];    // Bytes not reported yet to the backend.
+  scoped_array<char> user_buffers_[NUM_STREAMS];  // Store user data.
+  scoped_refptr<File> files_[NUM_STREAMS + 1];  // Files to store external user
+                                                // data and key.
+  int unreported_size_[NUM_STREAMS];  // Bytes not reported yet to the backend.
   bool doomed_;               // True if this entry was removed from the cache.
 
   DISALLOW_EVIL_CONSTRUCTORS(EntryImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_ENTRY_IMPL_H__