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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "bindings/core/v8/ScriptPromisePropertyBase.h"
#include "bindings/core/v8/ScopedPersistent.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8HiddenValue.h"
#include "core/dom/ExecutionContext.h"
namespace blink {
ScriptPromisePropertyBase::ScriptPromisePropertyBase(ExecutionContext* executionContext, Name name)
: ContextLifecycleObserver(executionContext)
, m_isolate(toIsolate(executionContext))
, m_name(name)
, m_state(Pending)
{
}
ScriptPromisePropertyBase::~ScriptPromisePropertyBase()
{
clearWrappers();
}
static void clearHandle(const v8::WeakCallbackData<v8::Object, ScopedPersistent<v8::Object> >& data)
{
data.GetParameter()->clear();
}
ScriptPromise ScriptPromisePropertyBase::promise(DOMWrapperWorld& world)
{
if (!executionContext())
return ScriptPromise();
v8::HandleScope handleScope(m_isolate);
v8::Handle<v8::Context> context = toV8Context(executionContext(), world);
if (context.IsEmpty())
return ScriptPromise();
ScriptState* scriptState = ScriptState::from(context);
ScriptState::Scope scope(scriptState);
v8::Handle<v8::Object> wrapper = ensureHolderWrapper(scriptState);
ASSERT(wrapper->CreationContext() == context);
v8::Handle<v8::Value> cachedPromise = V8HiddenValue::getHiddenValue(m_isolate, wrapper, promiseName());
if (!cachedPromise.IsEmpty())
return ScriptPromise(scriptState, cachedPromise);
// Create and cache the Promise
v8::Handle<v8::Promise::Resolver> resolver = v8::Promise::Resolver::New(m_isolate);
v8::Handle<v8::Promise> promise = resolver->GetPromise();
V8HiddenValue::setHiddenValue(m_isolate, wrapper, promiseName(), promise);
switch (m_state) {
case Pending:
// Cache the resolver too
V8HiddenValue::setHiddenValue(m_isolate, wrapper, resolverName(), resolver);
break;
case Resolved:
case Rejected:
resolveOrRejectInternal(resolver);
break;
}
return ScriptPromise(scriptState, promise);
}
void ScriptPromisePropertyBase::resolveOrReject(State targetState)
{
ASSERT(executionContext());
ASSERT(m_state == Pending);
ASSERT(targetState == Resolved || targetState == Rejected);
m_state = targetState;
v8::HandleScope handleScope(m_isolate);
size_t i = 0;
while (i < m_wrappers.size()) {
const OwnPtr<ScopedPersistent<v8::Object> >& persistent = m_wrappers[i];
if (persistent->isEmpty()) {
// wrapper has died.
// Since v8 GC can run during the iteration and clear the reference,
// we can't move this check out of the loop.
m_wrappers.remove(i);
continue;
}
v8::Local<v8::Object> wrapper = persistent->newLocal(m_isolate);
ScriptState::Scope scope(ScriptState::from(wrapper->CreationContext()));
v8::Local<v8::Promise::Resolver> resolver = V8HiddenValue::getHiddenValue(m_isolate, wrapper, resolverName()).As<v8::Promise::Resolver>();
V8HiddenValue::deleteHiddenValue(m_isolate, wrapper, resolverName());
resolveOrRejectInternal(resolver);
++i;
}
}
void ScriptPromisePropertyBase::resetBase()
{
clearWrappers();
m_state = Pending;
}
void ScriptPromisePropertyBase::resolveOrRejectInternal(v8::Handle<v8::Promise::Resolver> resolver)
{
switch (m_state) {
case Pending:
ASSERT_NOT_REACHED();
break;
case Resolved:
resolver->Resolve(resolvedValue(m_isolate, resolver->CreationContext()->Global()));
break;
case Rejected:
resolver->Reject(rejectedValue(m_isolate, resolver->CreationContext()->Global()));
break;
}
}
v8::Local<v8::Object> ScriptPromisePropertyBase::ensureHolderWrapper(ScriptState* scriptState)
{
v8::Local<v8::Context> context = scriptState->context();
size_t i = 0;
while (i < m_wrappers.size()) {
const OwnPtr<ScopedPersistent<v8::Object> >& persistent = m_wrappers[i];
if (persistent->isEmpty()) {
// wrapper has died.
// Since v8 GC can run during the iteration and clear the reference,
// we can't move this check out of the loop.
m_wrappers.remove(i);
continue;
}
v8::Local<v8::Object> wrapper = persistent->newLocal(m_isolate);
if (wrapper->CreationContext() == context)
return wrapper;
++i;
}
v8::Local<v8::Object> wrapper = holder(context->Global(), m_isolate);
OwnPtr<ScopedPersistent<v8::Object> > weakPersistent = adoptPtr(new ScopedPersistent<v8::Object>);
weakPersistent->set(m_isolate, wrapper);
weakPersistent->setWeak(weakPersistent.get(), &clearHandle);
m_wrappers.append(weakPersistent.release());
return wrapper;
}
void ScriptPromisePropertyBase::clearWrappers()
{
v8::HandleScope handleScope(m_isolate);
for (WeakPersistentSet::iterator i = m_wrappers.begin(); i != m_wrappers.end(); ++i) {
v8::Local<v8::Object> wrapper = (*i)->newLocal(m_isolate);
if (!wrapper.IsEmpty()) {
wrapper->DeleteHiddenValue(resolverName());
wrapper->DeleteHiddenValue(promiseName());
}
}
m_wrappers.clear();
}
v8::Handle<v8::String> ScriptPromisePropertyBase::promiseName()
{
switch (m_name) {
#define P(Name) \
case Name: \
return V8HiddenValue::Name ## Promise(m_isolate);
SCRIPT_PROMISE_PROPERTIES(P)
#undef P
}
ASSERT_NOT_REACHED();
return v8::Handle<v8::String>();
}
v8::Handle<v8::String> ScriptPromisePropertyBase::resolverName()
{
switch (m_name) {
#define P(Name) \
case Name: \
return V8HiddenValue::Name ## Resolver(m_isolate);
SCRIPT_PROMISE_PROPERTIES(P)
#undef P
}
ASSERT_NOT_REACHED();
return v8::Handle<v8::String>();
}
void ScriptPromisePropertyBase::trace(Visitor* visitor)
{
ContextLifecycleObserver::trace(visitor);
}
} // namespace blink
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