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// Copyright 2016 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 "core/streams/UnderlyingSourceBase.h"
#include "bindings/core/v8/ScriptPromise.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/ScriptValue.h"
#include "core/streams/ReadableStreamController.h"
#include <v8.h>
namespace blink {
ScriptPromise UnderlyingSourceBase::startWrapper(ScriptState* scriptState,
ScriptValue jsController) {
// Cannot call start twice (e.g., cannot use the same UnderlyingSourceBase to
// construct multiple streams).
ASSERT(!m_controller);
m_controller = new ReadableStreamController(jsController);
return start(scriptState);
}
ScriptPromise UnderlyingSourceBase::start(ScriptState* scriptState) {
return ScriptPromise::castUndefined(scriptState);
}
ScriptPromise UnderlyingSourceBase::pull(ScriptState* scriptState) {
return ScriptPromise::castUndefined(scriptState);
}
ScriptPromise UnderlyingSourceBase::cancelWrapper(ScriptState* scriptState,
ScriptValue reason) {
m_controller->noteHasBeenCanceled();
return cancel(scriptState, reason);
}
ScriptPromise UnderlyingSourceBase::cancel(ScriptState* scriptState,
ScriptValue reason) {
return ScriptPromise::castUndefined(scriptState);
}
void UnderlyingSourceBase::notifyLockAcquired() {
m_isStreamLocked = true;
}
void UnderlyingSourceBase::notifyLockReleased() {
m_isStreamLocked = false;
}
bool UnderlyingSourceBase::hasPendingActivity() const {
// This will return false within a finite time period _assuming_ that
// consumers use the controller to close or error the stream.
// Browser-created readable streams should always close or error within a
// finite time period, due to timeouts etc.
return m_controller && m_controller->isActive() && m_isStreamLocked;
}
void UnderlyingSourceBase::contextDestroyed(ExecutionContext*) {
if (m_controller) {
m_controller->noteHasBeenCanceled();
m_controller.clear();
}
}
DEFINE_TRACE(UnderlyingSourceBase) {
ContextLifecycleObserver::trace(visitor);
visitor->trace(m_controller);
}
} // namespace blink
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