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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.
- #ifndef STORAGE_BROWSER_FILE_SYSTEM_FILE_SYSTEM_OPERATION_CONTEXT_H_
- #define STORAGE_BROWSER_FILE_SYSTEM_FILE_SYSTEM_OPERATION_CONTEXT_H_
- #include <stdint.h>
- #include "base/component_export.h"
- #include "base/supports_user_data.h"
- #include "base/threading/thread_checker.h"
- #include "storage/browser/file_system/task_runner_bound_observer_list.h"
- namespace base {
- class SequencedTaskRunner;
- }
- namespace storage {
- class FileSystemContext;
- enum class QuotaLimitType;
- // A context class which is carried around by FileSystemOperation and
- // its delegated tasks. It is valid to reuse one context instance across
- // multiple operations as far as those operations are supposed to share
- // the same context (e.g. use the same task runner, share the quota etc).
- // Note that the remaining quota bytes (allowed_bytes_growth) may be
- // updated during the execution of write operations.
- class COMPONENT_EXPORT(STORAGE_BROWSER) FileSystemOperationContext
- : public base::SupportsUserData {
- public:
- explicit FileSystemOperationContext(FileSystemContext* context);
- // Specifies |task_runner| which the operation is performed on.
- // The backend of |task_runner| must outlive the IO thread.
- FileSystemOperationContext(FileSystemContext* context,
- base::SequencedTaskRunner* task_runner);
- FileSystemOperationContext(const FileSystemOperationContext&) = delete;
- FileSystemOperationContext& operator=(const FileSystemOperationContext&) =
- delete;
- ~FileSystemOperationContext() override;
- FileSystemContext* file_system_context() const {
- return file_system_context_.get();
- }
- // Updates the current remaining quota.
- // This can be called to update the remaining quota during the operation.
- void set_allowed_bytes_growth(const int64_t& allowed_bytes_growth) {
- allowed_bytes_growth_ = allowed_bytes_growth;
- }
- // Returns the current remaining quota.
- int64_t allowed_bytes_growth() const { return allowed_bytes_growth_; }
- QuotaLimitType quota_limit_type() const { return quota_limit_type_; }
- base::SequencedTaskRunner* task_runner() const { return task_runner_.get(); }
- ChangeObserverList* change_observers() { return &change_observers_; }
- UpdateObserverList* update_observers() { return &update_observers_; }
- // Following setters should be called only on the same thread as the
- // FileSystemOperationContext is created (i.e. are not supposed be updated
- // after the context's passed onto other task runners).
- void set_change_observers(const ChangeObserverList& list) {
- DCHECK_CALLED_ON_VALID_THREAD(setter_thread_checker_);
- change_observers_ = list;
- }
- void set_update_observers(const UpdateObserverList& list) {
- DCHECK_CALLED_ON_VALID_THREAD(setter_thread_checker_);
- update_observers_ = list;
- }
- void set_quota_limit_type(QuotaLimitType limit_type) {
- DCHECK_CALLED_ON_VALID_THREAD(setter_thread_checker_);
- quota_limit_type_ = limit_type;
- }
- private:
- scoped_refptr<FileSystemContext> file_system_context_;
- scoped_refptr<base::SequencedTaskRunner> task_runner_;
- // The current remaining quota, used by ObfuscatedFileUtil.
- int64_t allowed_bytes_growth_;
- // The current quota limit type, used by ObfuscatedFileUtil.
- QuotaLimitType quota_limit_type_;
- // Observers attached to this context.
- ChangeObserverList change_observers_;
- UpdateObserverList update_observers_;
- // Used to check its setters are not called on arbitrary thread.
- THREAD_CHECKER(setter_thread_checker_);
- };
- } // namespace storage
- #endif // STORAGE_BROWSER_FILE_SYSTEM_FILE_SYSTEM_OPERATION_CONTEXT_H_
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