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/*
* 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
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (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 THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_SCRIPT_PROMISE_H_
#define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_SCRIPT_PROMISE_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/bindings/core/v8/script_value.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
#include "v8/include/v8.h"
namespace blink {
class DOMException;
class ExceptionState;
// ScriptPromise is the class for representing Promise values in C++ world.
// ScriptPromise holds a Promise.
// So holding a ScriptPromise as a member variable in DOM object causes
// memory leaks since it has a reference from C++ to V8.
//
// There are cases where promises cannot work (e.g., where the thread is being
// terminated). In such cases operations will silently fail, so you should not
// use promises for critical use such as releasing a resource.
class CORE_EXPORT ScriptPromise final {
DISALLOW_NEW();
public:
// Constructs an empty promise.
ScriptPromise();
// Constructs a ScriptPromise from |promise|.
// If |promise| is not a Promise object, throws a v8 TypeError.
ScriptPromise(ScriptState*, v8::Local<v8::Value> promise);
ScriptPromise(const ScriptPromise&);
~ScriptPromise();
ScriptPromise Then(v8::Local<v8::Function> on_fulfilled,
v8::Local<v8::Function> on_rejected = {});
bool IsObject() const { return promise_.IsObject(); }
bool IsNull() const { return promise_.IsNull(); }
bool IsUndefinedOrNull() const {
return promise_.IsUndefined() || promise_.IsNull();
}
ScriptValue GetScriptValue() const { return promise_; }
v8::Local<v8::Value> V8Value() const { return promise_.V8Value(); }
v8::Isolate* GetIsolate() const { return promise_.GetIsolate(); }
bool IsEmpty() const { return promise_.IsEmpty(); }
void Clear() { promise_.Clear(); }
// Marks this promise as handled to avoid reporting unhandled rejections.
void MarkAsHandled();
bool operator==(const ScriptPromise& value) const {
return promise_ == value.promise_;
}
bool operator!=(const ScriptPromise& value) const {
return !operator==(value);
}
// Constructs and returns a ScriptPromise from |value|.
// if |value| is not a Promise object, returns a Promise object
// resolved with |value|.
// Returns |value| itself if it is a Promise.
static ScriptPromise Cast(ScriptState*, const ScriptValue& /*value*/);
static ScriptPromise Cast(ScriptState*, v8::Local<v8::Value> /*value*/);
// Constructs and returns a ScriptPromise resolved with undefined.
static ScriptPromise CastUndefined(ScriptState*);
static ScriptPromise Reject(ScriptState*, const ScriptValue&);
static ScriptPromise Reject(ScriptState*, v8::Local<v8::Value>);
// Rejects with a given exception. The ExceptionState gets cleared.
static ScriptPromise Reject(ScriptState*, ExceptionState&);
static ScriptPromise RejectWithDOMException(ScriptState*, DOMException*);
static v8::Local<v8::Promise> RejectRaw(ScriptState*, v8::Local<v8::Value>);
// Constructs and returns a ScriptPromise to be resolved when all |promises|
// are resolved. If one of |promises| is rejected, the returned
// ScriptPromise is rejected.
static ScriptPromise All(ScriptState*, const Vector<ScriptPromise>& promises);
// This is a utility class intended to be used internally.
// ScriptPromiseResolver is for general purpose.
class CORE_EXPORT InternalResolver final {
DISALLOW_NEW();
public:
explicit InternalResolver(ScriptState*);
v8::Local<v8::Promise> V8Promise() const;
ScriptPromise Promise() const;
void Resolve(v8::Local<v8::Value>);
void Reject(v8::Local<v8::Value>);
void Clear() { resolver_.Clear(); }
private:
ScriptValue resolver_;
};
private:
static void IncreaseInstanceCount();
static void DecreaseInstanceCount();
// TODO(peria): Move ScriptPromise to Oilpan heap.
GC_PLUGIN_IGNORE("813731")
Persistent<ScriptState> script_state_;
ScriptValue promise_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_SCRIPT_PROMISE_H_
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