mirror of
https://github.com/klzgrad/naiveproxy.git
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244 lines
8.2 KiB
C++
244 lines
8.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DISK_CACHE_BLOCKFILE_IN_FLIGHT_BACKEND_IO_H_
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#define NET_DISK_CACHE_BLOCKFILE_IN_FLIGHT_BACKEND_IO_H_
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#include <stdint.h>
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#include <list>
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#include <string>
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/single_thread_task_runner.h"
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#include "base/time/time.h"
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#include "net/base/completion_callback.h"
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#include "net/base/io_buffer.h"
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#include "net/disk_cache/blockfile/in_flight_io.h"
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#include "net/disk_cache/blockfile/rankings.h"
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namespace base {
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class Location;
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}
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namespace disk_cache {
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class BackendImpl;
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class Entry;
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class EntryImpl;
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// This class represents a single asynchronous disk cache IO operation while it
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// is being bounced between threads.
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class BackendIO : public BackgroundIO {
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public:
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BackendIO(InFlightIO* controller, BackendImpl* backend,
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const net::CompletionCallback& callback);
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// Runs the actual operation on the background thread.
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void ExecuteOperation();
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// Callback implementation.
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void OnIOComplete(int result);
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// Called when we are finishing this operation. If |cancel| is true, the user
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// callback will not be invoked.
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void OnDone(bool cancel);
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// Returns true if this operation is directed to an entry (vs. the backend).
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bool IsEntryOperation();
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net::CompletionCallback callback() const { return callback_; }
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// The operations we proxy:
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void Init();
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void OpenEntry(const std::string& key, Entry** entry);
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void CreateEntry(const std::string& key, Entry** entry);
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void DoomEntry(const std::string& key);
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void DoomAllEntries();
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void DoomEntriesBetween(const base::Time initial_time,
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const base::Time end_time);
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void DoomEntriesSince(const base::Time initial_time);
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void CalculateSizeOfAllEntries();
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void OpenNextEntry(Rankings::Iterator* iterator, Entry** next_entry);
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void EndEnumeration(std::unique_ptr<Rankings::Iterator> iterator);
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void OnExternalCacheHit(const std::string& key);
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void CloseEntryImpl(EntryImpl* entry);
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void DoomEntryImpl(EntryImpl* entry);
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void FlushQueue(); // Dummy operation.
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void RunTask(const base::Closure& task);
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void ReadData(EntryImpl* entry, int index, int offset, net::IOBuffer* buf,
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int buf_len);
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void WriteData(EntryImpl* entry, int index, int offset, net::IOBuffer* buf,
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int buf_len, bool truncate);
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void ReadSparseData(EntryImpl* entry,
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int64_t offset,
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net::IOBuffer* buf,
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int buf_len);
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void WriteSparseData(EntryImpl* entry,
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int64_t offset,
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net::IOBuffer* buf,
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int buf_len);
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void GetAvailableRange(EntryImpl* entry,
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int64_t offset,
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int len,
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int64_t* start);
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void CancelSparseIO(EntryImpl* entry);
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void ReadyForSparseIO(EntryImpl* entry);
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private:
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// There are two types of operations to proxy: regular backend operations are
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// executed sequentially (queued by the message loop). On the other hand,
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// operations targeted to a given entry can be long lived and support multiple
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// simultaneous users (multiple reads or writes to the same entry), and they
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// are subject to throttling, so we keep an explicit queue.
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enum Operation {
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OP_NONE = 0,
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OP_INIT,
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OP_OPEN,
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OP_CREATE,
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OP_DOOM,
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OP_DOOM_ALL,
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OP_DOOM_BETWEEN,
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OP_DOOM_SINCE,
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OP_SIZE_ALL,
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OP_OPEN_NEXT,
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OP_END_ENUMERATION,
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OP_ON_EXTERNAL_CACHE_HIT,
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OP_CLOSE_ENTRY,
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OP_DOOM_ENTRY,
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OP_FLUSH_QUEUE,
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OP_RUN_TASK,
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OP_MAX_BACKEND,
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OP_READ,
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OP_WRITE,
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OP_READ_SPARSE,
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OP_WRITE_SPARSE,
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OP_GET_RANGE,
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OP_CANCEL_IO,
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OP_IS_READY
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};
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~BackendIO() override;
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// Returns true if this operation returns an entry.
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bool ReturnsEntry();
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// Returns the time that has passed since the operation was created.
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base::TimeDelta ElapsedTime() const;
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void ExecuteBackendOperation();
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void ExecuteEntryOperation();
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BackendImpl* backend_;
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net::CompletionCallback callback_;
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Operation operation_;
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// The arguments of all the operations we proxy:
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std::string key_;
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Entry** entry_ptr_;
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base::Time initial_time_;
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base::Time end_time_;
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Rankings::Iterator* iterator_;
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std::unique_ptr<Rankings::Iterator> scoped_iterator_;
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EntryImpl* entry_;
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int index_;
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int offset_;
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scoped_refptr<net::IOBuffer> buf_;
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int buf_len_;
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bool truncate_;
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int64_t offset64_;
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int64_t* start_;
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base::TimeTicks start_time_;
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base::Closure task_;
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DISALLOW_COPY_AND_ASSIGN(BackendIO);
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};
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// The specialized controller that keeps track of current operations.
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class InFlightBackendIO : public InFlightIO {
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public:
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InFlightBackendIO(
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BackendImpl* backend,
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const scoped_refptr<base::SingleThreadTaskRunner>& background_thread);
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~InFlightBackendIO() override;
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// Proxied operations.
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void Init(const net::CompletionCallback& callback);
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void OpenEntry(const std::string& key, Entry** entry,
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const net::CompletionCallback& callback);
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void CreateEntry(const std::string& key, Entry** entry,
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const net::CompletionCallback& callback);
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void DoomEntry(const std::string& key,
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const net::CompletionCallback& callback);
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void DoomAllEntries(const net::CompletionCallback& callback);
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void DoomEntriesBetween(const base::Time initial_time,
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const base::Time end_time,
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const net::CompletionCallback& callback);
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void DoomEntriesSince(const base::Time initial_time,
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const net::CompletionCallback& callback);
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void CalculateSizeOfAllEntries(const net::CompletionCallback& callback);
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void OpenNextEntry(Rankings::Iterator* iterator, Entry** next_entry,
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const net::CompletionCallback& callback);
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void EndEnumeration(std::unique_ptr<Rankings::Iterator> iterator);
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void OnExternalCacheHit(const std::string& key);
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void CloseEntryImpl(EntryImpl* entry);
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void DoomEntryImpl(EntryImpl* entry);
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void FlushQueue(const net::CompletionCallback& callback);
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void RunTask(const base::Closure& task,
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const net::CompletionCallback& callback);
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void ReadData(EntryImpl* entry, int index, int offset, net::IOBuffer* buf,
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int buf_len, const net::CompletionCallback& callback);
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void WriteData(
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EntryImpl* entry, int index, int offset, net::IOBuffer* buf,
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int buf_len, bool truncate, const net::CompletionCallback& callback);
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void ReadSparseData(EntryImpl* entry,
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int64_t offset,
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net::IOBuffer* buf,
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int buf_len,
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const net::CompletionCallback& callback);
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void WriteSparseData(EntryImpl* entry,
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int64_t offset,
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net::IOBuffer* buf,
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int buf_len,
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const net::CompletionCallback& callback);
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void GetAvailableRange(EntryImpl* entry,
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int64_t offset,
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int len,
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int64_t* start,
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const net::CompletionCallback& callback);
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void CancelSparseIO(EntryImpl* entry);
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void ReadyForSparseIO(EntryImpl* entry,
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const net::CompletionCallback& callback);
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// Blocks until all operations are cancelled or completed.
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void WaitForPendingIO();
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scoped_refptr<base::SingleThreadTaskRunner> background_thread() {
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return background_thread_;
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}
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// Returns true if the current sequence is the background thread.
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bool BackgroundIsCurrentSequence() {
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return background_thread_->RunsTasksInCurrentSequence();
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}
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base::WeakPtr<InFlightBackendIO> GetWeakPtr();
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protected:
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void OnOperationComplete(BackgroundIO* operation, bool cancel) override;
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private:
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void PostOperation(const base::Location& from_here, BackendIO* operation);
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BackendImpl* backend_;
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scoped_refptr<base::SingleThreadTaskRunner> background_thread_;
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base::WeakPtrFactory<InFlightBackendIO> ptr_factory_;
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DISALLOW_COPY_AND_ASSIGN(InFlightBackendIO);
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};
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_BLOCKFILE_IN_FLIGHT_BACKEND_IO_H_
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