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// Copyright 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_ENTRY_OPERATION_H_
#define NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_OPERATION_H_
#include "base/memory/ref_counted.h"
#include "net/base/completion_callback.h"
#include "net/base/net_log.h"
namespace net {
class IOBuffer;
}
namespace disk_cache {
class Entry;
class SimpleEntryImpl;
// SimpleEntryOperation stores the information regarding operations in
// SimpleEntryImpl, between the moment they are issued by users of the backend,
// and the moment when they are executed.
class SimpleEntryOperation {
public:
typedef net::CompletionCallback CompletionCallback;
enum EntryOperationType {
TYPE_OPEN = 0,
TYPE_CREATE = 1,
TYPE_CLOSE = 2,
TYPE_READ = 3,
TYPE_WRITE = 4,
};
SimpleEntryOperation(const SimpleEntryOperation& other);
~SimpleEntryOperation();
static SimpleEntryOperation OpenOperation(SimpleEntryImpl* entry,
bool have_index,
const CompletionCallback& callback,
Entry** out_entry);
static SimpleEntryOperation CreateOperation(
SimpleEntryImpl* entry,
bool have_index,
const CompletionCallback& callback,
Entry** out_entry);
static SimpleEntryOperation CloseOperation(SimpleEntryImpl* entry);
static SimpleEntryOperation ReadOperation(SimpleEntryImpl* entry,
int index,
int offset,
int length,
net::IOBuffer* buf,
const CompletionCallback& callback,
bool alone_in_queue);
static SimpleEntryOperation WriteOperation(
SimpleEntryImpl* entry,
int index,
int offset,
int length,
net::IOBuffer* buf,
bool truncate,
bool optimistic,
const CompletionCallback& callback);
bool ConflictsWith(const SimpleEntryOperation& other_op) const;
// Releases all references. After calling this operation, SimpleEntryOperation
// will only hold POD members.
void ReleaseReferences();
EntryOperationType type() const {
return static_cast<EntryOperationType>(type_);
}
const CompletionCallback& callback() const { return callback_; }
Entry** out_entry() { return out_entry_; }
bool have_index() const { return have_index_; }
int index() const { return index_; }
int offset() const { return offset_; }
int length() const { return length_; }
net::IOBuffer* buf() { return buf_.get(); }
bool truncate() const { return truncate_; }
bool optimistic() const { return optimistic_; }
bool alone_in_queue() const { return alone_in_queue_; }
private:
SimpleEntryOperation(SimpleEntryImpl* entry,
net::IOBuffer* buf,
const CompletionCallback& callback,
Entry** out_entry,
int offset,
int length,
EntryOperationType type,
bool have_index,
int index,
bool truncate,
bool optimistic,
bool alone_in_queue);
// This ensures entry will not be deleted until the operation has ran.
scoped_refptr<SimpleEntryImpl> entry_;
scoped_refptr<net::IOBuffer> buf_;
CompletionCallback callback_;
// Used in open and create operations.
Entry** out_entry_;
// Used in write and read operations.
const int offset_;
const int length_;
const unsigned int type_ : 3; /* 3 */
// Used in open and create operations.
const unsigned int have_index_ : 1; /* 4 */
// Used in write and read operations.
const unsigned int index_ : 2; /* 6 */
// Used only in write operations.
const unsigned int truncate_ : 1; /* 7 */
const unsigned int optimistic_ : 1; /* 8 */
// Used only in SimpleCache.ReadIsParallelizable histogram.
const unsigned int alone_in_queue_ : 1; /* 9 */
};
} // namespace disk_cache
#endif // NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_OPERATION_H_
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