Add net to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 104 insertions, 0 deletions

diff --git a/net/disk_cache/mem_backend_impl.h b/net/disk_cache/mem_backend_impl.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// See net/disk_cache/disk_cache.h for the public interface of the cache.
+
+#ifndef NET_DISK_CACHE_MEM_BACKEND_IMPL_H__
+#define NET_DISK_CACHE_MEM_BACKEND_IMPL_H__
+
+#include <hash_map>
+
+#include "net/disk_cache/disk_cache.h"
+#include "net/disk_cache/mem_rankings.h"
+
+namespace disk_cache {
+
+class MemEntryImpl;
+
+// This class implements the Backend interface. An object of this class handles
+// the operations of the cache without writting to disk.
+class MemBackendImpl : public Backend {
+ public:
+  MemBackendImpl() : max_size_(0), current_size_(0) {}
+  ~MemBackendImpl();
+
+  // 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 Time initial_time, const Time end_time);
+  virtual bool DoomEntriesSince(const Time initial_time);
+  virtual bool OpenNextEntry(void** iter, Entry** next_entry);
+  virtual void EndEnumeration(void** iter);
+  virtual void GetStats(
+      std::vector<std::pair<std::string, std::string> >* stats) {}
+
+  // Sets the maximum size for the total amount of data stored by this instance.
+  bool SetMaxSize(int max_bytes);
+
+  // Permanently deletes an entry.
+  void InternalDoomEntry(MemEntryImpl* entry);
+
+  // Updates the ranking information for an entry.
+  void UpdateRank(MemEntryImpl* node);
+
+  // A user data block is being created, extended or truncated.
+  void ModifyStorageSize(int32 old_size, int32 new_size);
+
+  // Returns the maximum size for a file to reside on the cache.
+  int MaxFileSize() const;
+
+ private:
+  // Deletes entries from the cache until the current size is below the limit.
+  // If empty is true, the whole cache will be trimmed, regardless of being in
+  // use.
+  void TrimCache(bool empty);
+
+  // Handles the used storage count.
+  void AddStorageSize(int32 bytes);
+  void SubstractStorageSize(int32 bytes);
+
+  typedef stdext::hash_map<std::string, MemEntryImpl*> EntryMap;
+
+  EntryMap entries_;
+  MemRankings rankings_;  // Rankings to be able to trim the cache.
+  int32 max_size_;        // Maximum data size for this instance.
+  int32 current_size_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(MemBackendImpl);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_MEM_BACKEND_IMPL_H__