| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef CallbackPromiseAdapter_h |
| #define CallbackPromiseAdapter_h |
| |
| #include "bindings/core/v8/ScriptPromiseResolver.h" |
| #include "public/platform/WebCallbacks.h" |
| |
| namespace blink { |
| |
| // This class provides an easy way to convert from a Script-exposed |
| // class (i.e. a class that has a toV8() overload) that uses Promises |
| // to a WebKit API class that uses WebCallbacks. You can define |
| // separate Success and Error classes, but this example just uses one |
| // object for both. |
| // |
| // To use: |
| // |
| // class MyClass ... { |
| // typedef blink::WebMyClass WebType; |
| // static PassRefPtr<MyClass> take(ScriptPromiseResolver* resolver, |
| // blink::WebMyClass* webInstance) { |
| // // convert/create as appropriate, but often it's just: |
| // return MyClass::create(adoptPtr(webInstance)); |
| // |
| // // Since promise resolving is done as an async task, it's not |
| // // guaranteed that the script context has seen the promise resolve |
| // // immediately after calling onSuccess/onError. You can use the |
| // // ScriptPromise from the resolver to schedule a task that executes |
| // // after resolving: |
| // ScriptState::Scope scope(resolver->scriptState()); |
| // resolver->promise().then(...); |
| // } |
| // |
| // // Called when aborting to resolve/reject a promise due to an empty |
| // // execution context. |
| // static void dispose(blink::WebMyClass* webInstance) { |
| // // delete as appropriate, but often it's just: |
| // delete webInstance; |
| // } |
| // |
| // Now when calling into a WebKit API that requires a WebCallbacks<blink::WebMyClass, blink::WebMyClass>*: |
| // |
| // // call signature: callSomeMethod(WebCallbacks<MyClass, MyClass>* callbacks) |
| // webObject->callSomeMethod(new CallbackPromiseAdapter<MyClass, MyClass>(resolver, scriptExecutionContext)); |
| // |
| // Note that this class does not manage its own lifetime. In this |
| // example that ownership of the WebCallbacks instance is being passed |
| // in and it is up to the callee to free the WebCallbacks instace. |
| template<typename S, typename T> |
| class CallbackPromiseAdapter final : public blink::WebCallbacks<typename S::WebType, typename T::WebType> { |
| public: |
| explicit CallbackPromiseAdapter(PassRefPtr<ScriptPromiseResolver> resolver) |
| : m_resolver(resolver) |
| { |
| ASSERT(m_resolver); |
| } |
| virtual ~CallbackPromiseAdapter() { } |
| |
| virtual void onSuccess(typename S::WebType* result) override |
| { |
| if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped()) { |
| S::dispose(result); |
| return; |
| } |
| m_resolver->resolve(S::take(m_resolver.get(), result)); |
| } |
| |
| virtual void onError(typename T::WebType* error) override |
| { |
| if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped()) { |
| T::dispose(error); |
| return; |
| } |
| m_resolver->reject(T::take(m_resolver.get(), error)); |
| } |
| |
| private: |
| RefPtr<ScriptPromiseResolver> m_resolver; |
| WTF_MAKE_NONCOPYABLE(CallbackPromiseAdapter); |
| }; |
| |
| template<typename T> |
| class CallbackPromiseAdapter<void, T> final : public blink::WebCallbacks<void, typename T::WebType> { |
| public: |
| explicit CallbackPromiseAdapter(PassRefPtr<ScriptPromiseResolver> resolver) |
| : m_resolver(resolver) |
| { |
| ASSERT(m_resolver); |
| } |
| virtual ~CallbackPromiseAdapter() { } |
| |
| virtual void onSuccess() override |
| { |
| if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped()) { |
| return; |
| } |
| m_resolver->resolve(V8UndefinedType()); |
| } |
| |
| virtual void onError(typename T::WebType* error) override |
| { |
| if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped()) { |
| T::dispose(error); |
| return; |
| } |
| m_resolver->reject(T::take(m_resolver.get(), error)); |
| } |
| |
| private: |
| RefPtr<ScriptPromiseResolver> m_resolver; |
| WTF_MAKE_NONCOPYABLE(CallbackPromiseAdapter); |
| }; |
| |
| } // namespace blink |
| |
| #endif |