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// Copyright (c) 2013 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_SIMPLE_SIMPLE_SYNCHRONOUS_ENTRY_H_
#define NET_DISK_CACHE_SIMPLE_SIMPLE_SYNCHRONOUS_ENTRY_H_
#include <algorithm>
#include <string>
#include <utility>
#include <vector>
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/platform_file.h"
#include "base/time/time.h"
#include "net/disk_cache/simple/simple_entry_format.h"
namespace net {
class IOBuffer;
}
namespace disk_cache {
// Worker thread interface to the very simple cache. This interface is not
// thread safe, and callers must ensure that it is only ever accessed from
// a single thread between synchronization points.
class SimpleSynchronousEntry {
public:
struct CRCRecord {
CRCRecord();
CRCRecord(int index_p, bool has_crc32_p, uint32 data_crc32_p);
int index;
bool has_crc32;
uint32 data_crc32;
};
static void OpenEntry(
const base::FilePath& path,
uint64 entry_hash,
SimpleSynchronousEntry** out_entry,
int* out_result);
static void CreateEntry(
const base::FilePath& path,
const std::string& key,
uint64 entry_hash,
SimpleSynchronousEntry** out_entry,
int* out_result);
// Deletes an entry without first Opening it. Does not check if there is
// already an Entry object in memory holding the open files. Be careful! This
// is meant to be used by the Backend::DoomEntry() call. |callback| will be
// run by |callback_runner|.
static void DoomEntry(const base::FilePath& path,
const std::string& key,
uint64 entry_hash,
int* out_result);
// Like |DoomEntry()| above. Deletes all entries corresponding to the
// |key_hashes|. Succeeds only when all entries are deleted.
static void DoomEntrySet(scoped_ptr<std::vector<uint64> > key_hashes,
const base::FilePath& path,
int* out_result);
// N.B. ReadData(), WriteData(), CheckEOFRecord() and Close() may block on IO.
void ReadData(int index,
int offset,
net::IOBuffer* buf,
int buf_len,
uint32* out_crc32,
int* out_result);
void WriteData(int index,
int offset,
net::IOBuffer* buf,
int buf_len,
bool truncate,
int* out_result);
void CheckEOFRecord(int index,
uint32 expected_crc32,
int* out_result);
// Close all streams, and add write EOF records to streams indicated by the
// CRCRecord entries in |crc32s_to_write|.
void Close(scoped_ptr<std::vector<CRCRecord> > crc32s_to_write);
const base::FilePath& path() const { return path_; }
std::string key() const { return key_; }
base::Time last_used() const { return last_used_; }
base::Time last_modified() const { return last_modified_; }
int32 data_size(int index) const { return data_size_[index]; }
int64 GetFileSize() const;
private:
SimpleSynchronousEntry(
const base::FilePath& path,
const std::string& key,
uint64 entry_hash);
// Like Entry, the SimpleSynchronousEntry self releases when Close() is
// called.
~SimpleSynchronousEntry();
bool OpenOrCreateFiles(bool create);
void CloseFiles();
// Returns a net::Error, i.e. net::OK on success.
int InitializeForOpen();
// Returns a net::Error, including net::OK on success and net::FILE_EXISTS
// when the entry already exists.
int InitializeForCreate();
void Doom();
static bool DeleteFilesForEntryHash(const base::FilePath& path,
uint64 entry_hash);
const base::FilePath path_;
const uint64 entry_hash_;
std::string key_;
bool have_open_files_;
bool initialized_;
base::Time last_used_;
base::Time last_modified_;
int32 data_size_[kSimpleEntryFileCount];
base::PlatformFile files_[kSimpleEntryFileCount];
};
} // namespace disk_cache
#endif // NET_DISK_CACHE_SIMPLE_SIMPLE_SYNCHRONOUS_ENTRY_H_
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