gecko/dom/promise/PromiseCallback.h
2015-05-03 15:32:37 -04:00

158 lines
4.3 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_PromiseCallback_h
#define mozilla_dom_PromiseCallback_h
#include "mozilla/dom/Promise.h"
#include "nsCycleCollectionParticipant.h"
namespace mozilla {
namespace dom {
// This is the base class for any PromiseCallback.
// It's a logical step in the promise chain of callbacks.
class PromiseCallback : public nsISupports
{
protected:
virtual ~PromiseCallback();
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(PromiseCallback)
PromiseCallback();
virtual nsresult Call(JSContext* aCx,
JS::Handle<JS::Value> aValue) = 0;
// Return the Promise that this callback will end up resolving or
// rejecting, if any.
virtual Promise* GetDependentPromise() = 0;
enum Task {
Resolve,
Reject
};
// This factory returns a PromiseCallback object with refcount of 0.
static PromiseCallback*
Factory(Promise* aNextPromise, JS::Handle<JSObject*> aObject,
AnyCallback* aCallback, Task aTask);
};
// WrapperPromiseCallback execs a JS Callback with a value, and then the return
// value is sent to the aNextPromise->ResolveFunction() or to
// aNextPromise->RejectFunction() if the JS Callback throws.
class WrapperPromiseCallback final : public PromiseCallback
{
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(WrapperPromiseCallback,
PromiseCallback)
nsresult Call(JSContext* aCx,
JS::Handle<JS::Value> aValue) override;
Promise* GetDependentPromise() override
{
return mNextPromise;
}
WrapperPromiseCallback(Promise* aNextPromise, JS::Handle<JSObject*> aGlobal,
AnyCallback* aCallback);
private:
~WrapperPromiseCallback();
nsRefPtr<Promise> mNextPromise;
JS::Heap<JSObject*> mGlobal;
nsRefPtr<AnyCallback> mCallback;
};
// ResolvePromiseCallback calls aPromise->ResolveFunction() with the value
// received by Call().
class ResolvePromiseCallback final : public PromiseCallback
{
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(ResolvePromiseCallback,
PromiseCallback)
nsresult Call(JSContext* aCx,
JS::Handle<JS::Value> aValue) override;
Promise* GetDependentPromise() override
{
return mPromise;
}
ResolvePromiseCallback(Promise* aPromise, JS::Handle<JSObject*> aGlobal);
private:
~ResolvePromiseCallback();
nsRefPtr<Promise> mPromise;
JS::Heap<JSObject*> mGlobal;
};
// RejectPromiseCallback calls aPromise->RejectFunction() with the value
// received by Call().
class RejectPromiseCallback final : public PromiseCallback
{
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(RejectPromiseCallback,
PromiseCallback)
nsresult Call(JSContext* aCx,
JS::Handle<JS::Value> aValue) override;
Promise* GetDependentPromise() override
{
return mPromise;
}
RejectPromiseCallback(Promise* aPromise, JS::Handle<JSObject*> aGlobal);
private:
~RejectPromiseCallback();
nsRefPtr<Promise> mPromise;
JS::Heap<JSObject*> mGlobal;
};
// NativePromiseCallback wraps a PromiseNativeHandler.
class NativePromiseCallback final : public PromiseCallback
{
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(NativePromiseCallback,
PromiseCallback)
nsresult Call(JSContext* aCx,
JS::Handle<JS::Value> aValue) override;
Promise* GetDependentPromise() override
{
return nullptr;
}
NativePromiseCallback(PromiseNativeHandler* aHandler,
Promise::PromiseState aState);
private:
~NativePromiseCallback();
nsRefPtr<PromiseNativeHandler> mHandler;
Promise::PromiseState mState;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_PromiseCallback_h