Adding disk_cache::Entry implementation.

net/disk_cache/flash/internal_entry.h

+// Copyright (c) 2012 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_FLASH_INTERNAL_ENTRY_H_
+#define NET_DISK_CACHE_FLASH_INTERNAL_ENTRY_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/completion_callback.h"
+#include "net/base/net_export.h"
+#include "net/disk_cache/flash/format.h"
+
+namespace net {
+
+class IOBuffer;
+
+}  // namespace net
+
+namespace disk_cache {
+
+struct KeyAndStreamSizes {
+  KeyAndStreamSizes();
+  std::string key;
+  int stream_sizes[kFlashLogStoreEntryNumStreams];
+};
+
+class LogStore;
+class LogStoreEntry;
+
+// Actual entry implementation that does all the work of reading, writing and
+// storing data.  FlashEntryImpl contains a pair of InternalEntry objects, each

[rvargas (doing something else), 2013/04/06 01:25:23]

nit: don't document the caller of this code... comments should refer to what the
code being commented does.

[agayev, 2013/04/06 03:24:29]

Done.

+// living in a separate thread.  Only one of these is used throughout the
+// lifetime of FlashEntryImpl depending on whether it refers to a new entry or
+// an old entry.
+class NET_EXPORT_PRIVATE InternalEntry
+    : public base::RefCountedThreadSafe<InternalEntry> {
+  friend class base::RefCountedThreadSafe<InternalEntry>;
+ public:
+  InternalEntry(const std::string& key, LogStore* store);
+  InternalEntry(int32 id, LogStore* store);
+  ~InternalEntry();
+
+  scoped_ptr<KeyAndStreamSizes> Init();
+  int32 GetDataSize(int index) const;
+  int ReadData(int index, int offset, net::IOBuffer* buf, int buf_len,
+               const net::CompletionCallback& callback);
+  int WriteData(int index, int offset, net::IOBuffer* buf, int buf_len,
+                const net::CompletionCallback& callback);
+  void Close();
+
+ private:
+  bool WriteKey(LogStoreEntry* entry, const std::string& key);
+  bool ReadKey(LogStoreEntry* entry, std::string* key);
+
+  LogStore* store_;
+  scoped_ptr<LogStoreEntry> entry_;
+
+  DISALLOW_COPY_AND_ASSIGN(InternalEntry);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_FLASH_INTERNAL_ENTRY_H_