New disk cache eviction algorithm.

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__
+#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"
 
 namespace disk_cache {
 
 class BackendImpl;
 
 // This class implements the Entry interface. An object of this
@@ skipping 28 matching lines @@
 
   uint32 GetHash();
 
   // Performs the initialization of a EntryImpl that will be added to the
   // cache.
   bool CreateEntry(Addr node_address, const std::string& key, uint32 hash);
 
   // Returns true if this entry matches the lookup arguments.
   bool IsSameEntry(const std::string& key, uint32 hash);
 
-  // Permamently destroys this entry
+  // Permamently destroys this entry.
   void InternalDoom();
 
+  // Deletes this entry from disk. If |everything| is false, only the user data
+  // will be removed, leaving the key and control data intact.
+  void DeleteEntryData(bool everything);
+
   // Returns the address of the next entry on the list of entries with the same
   // hash.
   CacheAddr GetNextAddress();
 
   // Sets the address of the next entry on the list of entries with the same
   // hash.
   void SetNextAddress(Addr address);
 
   // Reloads the rankings node information.
   bool LoadNodeAddress();
@@ skipping 73 matching lines @@
                                                 // 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.
   bool need_file_[NUM_STREAMS];  // True if stream is prepared as an external
                                  // file.
   DISALLOW_EVIL_CONSTRUCTORS(EntryImpl);
 };
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_ENTRY_IMPL_H__
+#endif  // NET_DISK_CACHE_ENTRY_IMPL_H_