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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/file_system_provider/fileapi/backend_delegate.h"
#include <memory>
#include "chrome/browser/ash/file_system_provider/fileapi/buffering_file_stream_reader.h"
#include "chrome/browser/ash/file_system_provider/fileapi/buffering_file_stream_writer.h"
#include "chrome/browser/ash/file_system_provider/fileapi/file_stream_reader.h"
#include "chrome/browser/ash/file_system_provider/fileapi/file_stream_writer.h"
#include "chrome/browser/ash/file_system_provider/fileapi/provider_async_file_util.h"
#include "chrome/browser/ash/file_system_provider/fileapi/watcher_manager.h"
#include "chrome/browser/ash/fileapi/diversion_backend_delegate.h"
#include "content/public/browser/browser_thread.h"
#include "storage/browser/file_system/file_stream_reader.h"
#include "storage/browser/file_system/file_stream_writer.h"
#include "storage/browser/file_system/file_system_url.h"
using content::BrowserThread;
namespace ash::file_system_provider {
namespace {
// Size of the stream reader internal buffer. At most this number of bytes will
// be read ahead of the requested data.
const int kReaderBufferSize = 512 * 1024; // 512KB.
// Size of the stream writer internal buffer. At most this number of bytes will
// be postponed for writing.
const int kWriterBufferSize = 512 * 1024; // 512KB.
} // namespace
BackendDelegate::BackendDelegate()
: async_file_util_(new internal::ProviderAsyncFileUtil),
watcher_manager_(new WatcherManager) {
}
BackendDelegate::~BackendDelegate() = default;
// static
std::unique_ptr<FileSystemBackendDelegate> BackendDelegate::MakeUnique() {
std::unique_ptr<FileSystemBackendDelegate> wrappee(new BackendDelegate());
return std::make_unique<ash::DiversionBackendDelegate>(std::move(wrappee));
}
storage::AsyncFileUtil* BackendDelegate::GetAsyncFileUtil(
storage::FileSystemType type) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK_EQ(storage::kFileSystemTypeProvided, type);
return async_file_util_.get();
}
std::unique_ptr<storage::FileStreamReader>
BackendDelegate::CreateFileStreamReader(
const storage::FileSystemURL& url,
int64_t offset,
int64_t max_bytes_to_read,
const base::Time& expected_modification_time,
storage::FileSystemContext* context) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK_EQ(storage::kFileSystemTypeProvided, url.type());
return std::unique_ptr<storage::FileStreamReader>(
new BufferingFileStreamReader(
std::unique_ptr<storage::FileStreamReader>(new FileStreamReader(
context, url, offset, expected_modification_time)),
kReaderBufferSize, max_bytes_to_read));
}
std::unique_ptr<storage::FileStreamWriter>
BackendDelegate::CreateFileStreamWriter(const storage::FileSystemURL& url,
int64_t offset,
storage::FileSystemContext* context) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK_EQ(storage::kFileSystemTypeProvided, url.type());
return std::unique_ptr<storage::FileStreamWriter>(
new BufferingFileStreamWriter(std::unique_ptr<storage::FileStreamWriter>(
new FileStreamWriter(url, offset)),
kWriterBufferSize));
}
storage::WatcherManager* BackendDelegate::GetWatcherManager(
storage::FileSystemType type) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK_EQ(storage::kFileSystemTypeProvided, type);
return watcher_manager_.get();
}
} // namespace ash::file_system_provider
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