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// 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.
#include "net/disk_cache/file.h"
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/run_loop.h"
#include "base/task_runner_util.h"
#include "base/threading/sequenced_worker_pool.h"
#include "net/base/net_errors.h"
#include "net/disk_cache/disk_cache.h"
namespace {
// The maximum number of threads for this pool.
const int kMaxThreads = 5;
class FileWorkerPool : public base::SequencedWorkerPool {
public:
FileWorkerPool() : base::SequencedWorkerPool(kMaxThreads, "CachePool") {}
protected:
virtual ~FileWorkerPool() {}
};
base::LazyInstance<FileWorkerPool>::Leaky s_worker_pool =
LAZY_INSTANCE_INITIALIZER;
} // namespace
namespace disk_cache {
File::File(base::PlatformFile file)
: init_(true),
mixed_(true),
platform_file_(file),
sync_platform_file_(base::kInvalidPlatformFileValue) {
}
bool File::Init(const base::FilePath& name) {
if (init_)
return false;
int flags = base::PLATFORM_FILE_OPEN |
base::PLATFORM_FILE_READ |
base::PLATFORM_FILE_WRITE;
platform_file_ = base::CreatePlatformFile(name, flags, NULL, NULL);
if (platform_file_ < 0) {
platform_file_ = 0;
return false;
}
init_ = true;
return true;
}
base::PlatformFile File::platform_file() const {
return platform_file_;
}
bool File::IsValid() const {
if (!init_)
return false;
return (base::kInvalidPlatformFileValue != platform_file_);
}
bool File::Read(void* buffer, size_t buffer_len, size_t offset) {
DCHECK(init_);
if (buffer_len > static_cast<size_t>(kint32max) ||
offset > static_cast<size_t>(kint32max)) {
return false;
}
int ret = base::ReadPlatformFile(platform_file_, offset,
static_cast<char*>(buffer), buffer_len);
return (static_cast<size_t>(ret) == buffer_len);
}
bool File::Write(const void* buffer, size_t buffer_len, size_t offset) {
DCHECK(init_);
if (buffer_len > static_cast<size_t>(kint32max) ||
offset > static_cast<size_t>(kint32max)) {
return false;
}
int ret = base::WritePlatformFile(platform_file_, offset,
static_cast<const char*>(buffer),
buffer_len);
return (static_cast<size_t>(ret) == buffer_len);
}
bool File::Read(void* buffer, size_t buffer_len, size_t offset,
FileIOCallback* callback, bool* completed) {
DCHECK(init_);
if (!callback) {
if (completed)
*completed = true;
return Read(buffer, buffer_len, offset);
}
if (buffer_len > static_cast<size_t>(kint32max) ||
offset > static_cast<size_t>(kint32max)) {
return false;
}
base::PostTaskAndReplyWithResult(
s_worker_pool.Pointer(), FROM_HERE,
base::Bind(&File::DoRead, this, buffer, buffer_len, offset),
base::Bind(&File::OnOperationComplete, this, callback));
*completed = false;
return true;
}
bool File::Write(const void* buffer, size_t buffer_len, size_t offset,
FileIOCallback* callback, bool* completed) {
DCHECK(init_);
if (!callback) {
if (completed)
*completed = true;
return Write(buffer, buffer_len, offset);
}
if (buffer_len > static_cast<size_t>(kint32max) ||
offset > static_cast<size_t>(kint32max)) {
return false;
}
base::PostTaskAndReplyWithResult(
s_worker_pool.Pointer(), FROM_HERE,
base::Bind(&File::DoWrite, this, buffer, buffer_len, offset),
base::Bind(&File::OnOperationComplete, this, callback));
*completed = false;
return true;
}
bool File::SetLength(size_t length) {
DCHECK(init_);
if (length > kuint32max)
return false;
return base::TruncatePlatformFile(platform_file_, length);
}
size_t File::GetLength() {
DCHECK(init_);
int64 len = base::SeekPlatformFile(platform_file_,
base::PLATFORM_FILE_FROM_END, 0);
if (len > static_cast<int64>(kuint32max))
return kuint32max;
return static_cast<size_t>(len);
}
// Static.
void File::WaitForPendingIO(int* num_pending_io) {
// We are running unit tests so we should wait for all callbacks. Sadly, the
// worker pool only waits for tasks on the worker pool, not the "Reply" tasks
// so we have to let the current message loop to run.
s_worker_pool.Get().FlushForTesting();
base::RunLoop().RunUntilIdle();
}
// Static.
void File::DropPendingIO() {
}
File::~File() {
if (IsValid())
base::ClosePlatformFile(platform_file_);
}
// Runs on a worker thread.
int File::DoRead(void* buffer, size_t buffer_len, size_t offset) {
if (Read(const_cast<void*>(buffer), buffer_len, offset))
return static_cast<int>(buffer_len);
return net::ERR_CACHE_READ_FAILURE;
}
// Runs on a worker thread.
int File::DoWrite(const void* buffer, size_t buffer_len, size_t offset) {
if (Write(const_cast<void*>(buffer), buffer_len, offset))
return static_cast<int>(buffer_len);
return net::ERR_CACHE_WRITE_FAILURE;
}
// This method actually makes sure that the last reference to the file doesn't
// go away on the worker pool.
void File::OnOperationComplete(FileIOCallback* callback, int result) {
callback->OnFileIOComplete(result);
}
} // namespace disk_cache
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