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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 WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
#define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
#include "base/files/file_path.h"
#include "base/supports_user_data.h"
#include "base/threading/thread_checker.h"
#include "webkit/browser/fileapi/task_runner_bound_observer_list.h"
#include "webkit/browser/webkit_storage_browser_export.h"
#include "webkit/common/quota/quota_types.h"
namespace base {
class SequencedTaskRunner;
}
namespace fileapi {
class FileSystemContext;
// 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 WEBKIT_STORAGE_BROWSER_EXPORT_PRIVATE FileSystemOperationContext
: public base::SupportsUserData {
public:
explicit FileSystemOperationContext(FileSystemContext* context);
// Specifies |task_runner| which the operation is performed on.
FileSystemOperationContext(FileSystemContext* context,
base::SequencedTaskRunner* task_runner);
virtual ~FileSystemOperationContext();
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& allowed_bytes_growth) {
allowed_bytes_growth_ = allowed_bytes_growth;
}
// Returns the current remaining quota.
int64 allowed_bytes_growth() const { return allowed_bytes_growth_; }
quota::QuotaLimitType quota_limit_type() const { return quota_limit_type_; }
base::SequencedTaskRunner* task_runner() const { return task_runner_.get(); }
const base::FilePath& root_path() const { return root_path_; }
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(setter_thread_checker_.CalledOnValidThread());
change_observers_ = list;
}
void set_update_observers(const UpdateObserverList& list) {
DCHECK(setter_thread_checker_.CalledOnValidThread());
update_observers_ = list;
}
void set_quota_limit_type(quota::QuotaLimitType limit_type) {
DCHECK(setter_thread_checker_.CalledOnValidThread());
quota_limit_type_ = limit_type;
}
void set_root_path(const base::FilePath& root_path) {
DCHECK(setter_thread_checker_.CalledOnValidThread());
root_path_ = root_path;
}
// Gets and sets value-type (or not-owned) variable as UserData.
// (SetUserValue can be called only on the same thread as this context
// is created as well as other setters.)
template <typename T> T GetUserValue(const char* key) const {
ValueAdapter<T>* v = static_cast<ValueAdapter<T>*>(GetUserData(key));
return v ? v->value() : T();
}
template <typename T> void SetUserValue(const char* key, const T& value) {
DCHECK(setter_thread_checker_.CalledOnValidThread());
SetUserData(key, new ValueAdapter<T>(value));
}
private:
// An adapter for setting a value-type (or not owned) data as UserData.
template <typename T> class ValueAdapter
: public base::SupportsUserData::Data {
public:
ValueAdapter(const T& value) : value_(value) {}
const T& value() const { return value_; }
private:
T value_;
DISALLOW_COPY_AND_ASSIGN(ValueAdapter);
};
scoped_refptr<FileSystemContext> file_system_context_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
// The current remaining quota, used by ObfuscatedFileUtil.
int64 allowed_bytes_growth_;
// The current quota limit type, used by ObfuscatedFileUtil.
quota::QuotaLimitType quota_limit_type_;
// Observers attached to this context.
ChangeObserverList change_observers_;
UpdateObserverList update_observers_;
// Root path for the operation, used by LocalFileUtil.
base::FilePath root_path_;
// Used to check its setters are not called on arbitrary thread.
base::ThreadChecker setter_thread_checker_;
DISALLOW_COPY_AND_ASSIGN(FileSystemOperationContext);
};
} // namespace fileapi
#endif // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
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