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/* -*- 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 {
#ifndef SPIDERMONKEY_PROMISE
// 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 either:
// a) If aNextPromise is non-null, the aNextPromise->ResolveFunction() or to
// aNextPromise->RejectFunction() if the JS Callback throws.
// or
// b) If aNextPromise is null, in which case aResolveFunc and aRejectFunc must
// be non-null, then to aResolveFunc, unless aCallback threw, in which case
// aRejectFunc.
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;
// Constructor for when we know we have a vanilla Promise.
WrapperPromiseCallback(Promise* aNextPromise, JS::Handle<JSObject*> aGlobal,
AnyCallback* aCallback);
// Constructor for when all we have to work with are resolve/reject functions.
WrapperPromiseCallback(JS::Handle<JSObject*> aGlobal,
AnyCallback* aCallback,
JS::Handle<JSObject*> mNextPromiseObj,
AnyCallback* aResolveFunc,
AnyCallback* aRejectFunc);
private:
~WrapperPromiseCallback();
// Either mNextPromise is non-null or all three of mNextPromiseObj,
// mResolveFund and mRejectFunc must are non-null.
RefPtr<Promise> mNextPromise;
// mNextPromiseObj is the reflector itself; it may not be in the
// same compartment as anything else we have.
JS::Heap<JSObject*> mNextPromiseObj;
RefPtr<AnyCallback> mResolveFunc;
RefPtr<AnyCallback> mRejectFunc;
JS::Heap<JSObject*> mGlobal;
RefPtr<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();
RefPtr<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();
RefPtr<Promise> mPromise;
JS::Heap<JSObject*> mGlobal;
};
// InvokePromiseFuncCallback calls the given function with the value
// received by Call().
class InvokePromiseFuncCallback final : public PromiseCallback
{
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(InvokePromiseFuncCallback,
PromiseCallback)
nsresult Call(JSContext* aCx,
JS::Handle<JS::Value> aValue) override;
Promise* GetDependentPromise() override;
InvokePromiseFuncCallback(JS::Handle<JSObject*> aGlobal,
JS::Handle<JSObject*> aNextPromiseObj,
AnyCallback* aPromiseFunc);
private:
~InvokePromiseFuncCallback();
JS::Heap<JSObject*> mGlobal;
JS::Heap<JSObject*> mNextPromiseObj;
RefPtr<AnyCallback> mPromiseFunc;
};
// 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();
RefPtr<PromiseNativeHandler> mHandler;
Promise::PromiseState mState;
};
#endif // SPIDERMONKEY_PROMISE
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_PromiseCallback_h
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