Disk cache: Add explicit support for eviction / deletion...

net/disk_cache/entry_impl.h

 // Copyright (c) 2006-2009 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 "base/scoped_ptr.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/storage_block.h"
@@ skipping 132 matching lines @@
 
   // Loads the external file to this object's memory buffer.
   bool ImportSeparateFile(int index, int offset, int buf_len);
 
   // Flush the in-memory data to the backing storage.
   bool Flush(int index, int size, bool async);
 
   // Initializes the sparse control object. Returns a net error code.
   int InitSparseData();
 
+  // Adds the provided |flags| to the current EntryFlags for this entry.
+  void SetEntryFlags(uint32 flags);
+
+  // Returns the current EntryFlags for this entry.
+  uint32 GetEntryFlags();
+
+  // Gets the data stored at the given index. If the information is in memory,
+  // a buffer will be allocated and the data will be copied to it (the caller
+  // can find out the size of the buffer before making this call). Otherwise,
+  // the cache address of the data will be returned, and that address will be
+  // removed from the regular book keeping of this entry so the caller is
+  // responsible for deleting the block (or file) from the backing store at some
+  // point; there is no need to report any storage-size change, only to do the
+  // actual cleanup.
+  void GetData(int index, char** buffer, Addr* address);
+
   // Generates a histogram for the time spent working on this operation.
   void ReportIOTime(Operation op, const base::Time& start);
 
   // 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_[kNumStreams];  // Store user data.
   scoped_refptr<File> files_[kNumStreams + 1];    // Files to store external
                                                   // user data and key.
   int unreported_size_[kNumStreams];  // Bytes not reported yet to the backend.
   bool doomed_;               // True if this entry was removed from the cache.
   scoped_ptr<SparseControl> sparse_;  // Support for sparse entries.
 
   DISALLOW_EVIL_CONSTRUCTORS(EntryImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_ENTRY_IMPL_H_