зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
3.6 KiB
C++
106 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_dom_cache_Action_h
|
|
#define mozilla_dom_cache_Action_h
|
|
|
|
#include "mozilla/Atomics.h"
|
|
#include "mozilla/dom/cache/Types.h"
|
|
#include "mozilla/dom/SafeRefPtr.h"
|
|
#include "nsISupportsImpl.h"
|
|
|
|
class mozIStorageConnection;
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
namespace cache {
|
|
|
|
class Action : public SafeRefCounted<Action> {
|
|
public:
|
|
class Resolver {
|
|
public:
|
|
Resolver& operator=(const Resolver& aRHS) = delete;
|
|
|
|
// Note: Action must drop Resolver ref after calling Resolve()!
|
|
// Note: Must be called on the same thread used to execute
|
|
// Action::RunOnTarget().
|
|
virtual void Resolve(nsresult aRv) = 0;
|
|
|
|
inline SafeRefPtr<Action::Resolver> SafeRefPtrFromThis() {
|
|
return SafeRefPtr<Action::Resolver>{this, AcquireStrongRefFromRawPtr{}};
|
|
}
|
|
|
|
NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
|
|
};
|
|
|
|
// Class containing data that can be opportunistically shared between
|
|
// multiple Actions running on the same thread/Context. In theory
|
|
// this could be abstracted to a generic key/value map, but for now
|
|
// just explicitly provide accessors for the data we need.
|
|
class Data {
|
|
public:
|
|
virtual mozIStorageConnection* GetConnection() const = 0;
|
|
|
|
virtual void SetConnection(mozIStorageConnection* aConn) = 0;
|
|
};
|
|
|
|
// virtual because deleted through base class pointer
|
|
virtual ~Action();
|
|
|
|
// Execute operations on the target thread. Once complete call
|
|
// Resolver::Resolve(). This can be done sync or async.
|
|
// Note: Action should hold Resolver ref until its ready to call Resolve().
|
|
// Note: The "target" thread is determined when the Action is scheduled on
|
|
// Context. The Action should not assume any particular thread is used.
|
|
virtual void RunOnTarget(SafeRefPtr<Resolver> aResolver,
|
|
const QuotaInfo& aQuotaInfo,
|
|
Data* aOptionalData) = 0;
|
|
|
|
// Called on initiating thread when the Action is canceled. The Action is
|
|
// responsible for calling Resolver::Resolve() as normal; either with a
|
|
// normal error code or NS_ERROR_ABORT. If CancelOnInitiatingThread() is
|
|
// called after Resolve() has already occurred, then the cancel can be
|
|
// ignored.
|
|
//
|
|
// Cancellation is a best effort to stop processing as soon as possible, but
|
|
// does not guarantee the Action will not run.
|
|
//
|
|
// CancelOnInitiatingThread() may be called more than once. Subsequent
|
|
// calls should have no effect.
|
|
//
|
|
// Default implementation sets an internal cancellation flag that can be
|
|
// queried with IsCanceled().
|
|
virtual void CancelOnInitiatingThread();
|
|
|
|
// Executed on the initiating thread and is passed the nsresult given to
|
|
// Resolver::Resolve().
|
|
virtual void CompleteOnInitiatingThread(nsresult aRv) {}
|
|
|
|
// Executed on the initiating thread. If this Action will operate on the
|
|
// given cache ID then override this to return true.
|
|
virtual bool MatchesCacheId(CacheId aCacheId) const { return false; }
|
|
|
|
NS_DECL_OWNINGTHREAD
|
|
MOZ_DECLARE_REFCOUNTED_TYPENAME(cache::Action)
|
|
|
|
protected:
|
|
Action();
|
|
|
|
// Check if this Action has been canceled. May be called from any thread,
|
|
// but typically used from the target thread.
|
|
bool IsCanceled() const;
|
|
|
|
private:
|
|
// Accessible from any thread.
|
|
Atomic<bool> mCanceled;
|
|
};
|
|
|
|
} // namespace cache
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_dom_cache_Action_h
|