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/*
* Copyright (C) 2008 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 MessagePort_h
#define MessagePort_h
#include "bindings/core/v8/ActiveScriptWrappable.h"
#include "bindings/core/v8/SerializedScriptValue.h"
#include "core/CoreExport.h"
#include "core/dom/ContextLifecycleObserver.h"
#include "core/events/EventListener.h"
#include "core/events/EventTarget.h"
#include "public/platform/WebMessagePortChannel.h"
#include "public/platform/WebMessagePortChannelClient.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
#include <memory>
namespace blink {
class ExceptionState;
class ExecutionContext;
class MessagePort;
class SerializedScriptValue;
// Not to be confused with WebMessagePortChannelArray; this one uses Vector and
// std::unique_ptr instead of WebVector and raw pointers.
typedef Vector<WebMessagePortChannelUniquePtr, 1> MessagePortChannelArray;
class CORE_EXPORT MessagePort : public EventTargetWithInlineData,
public ActiveScriptWrappable<MessagePort>,
public ContextLifecycleObserver,
public WebMessagePortChannelClient {
DEFINE_WRAPPERTYPEINFO();
USING_GARBAGE_COLLECTED_MIXIN(MessagePort);
public:
static MessagePort* create(ExecutionContext&);
~MessagePort() override;
void postMessage(ExecutionContext*,
PassRefPtr<SerializedScriptValue> message,
const MessagePortArray&,
ExceptionState&);
static bool canTransferArrayBuffersAndImageBitmaps() { return false; }
void start();
void close();
void entangle(WebMessagePortChannelUniquePtr);
WebMessagePortChannelUniquePtr disentangle();
// Returns nullptr if the passed-in array is nullptr/empty.
static std::unique_ptr<WebMessagePortChannelArray>
toWebMessagePortChannelArray(std::unique_ptr<MessagePortChannelArray>);
// Returns an empty array if the passed array is empty.
static MessagePortArray* toMessagePortArray(
ExecutionContext*,
const WebMessagePortChannelArray&);
// Returns nullptr if there is an exception, or if the passed-in array is
// nullptr/empty.
static std::unique_ptr<MessagePortChannelArray>
disentanglePorts(ExecutionContext*, const MessagePortArray&, ExceptionState&);
// Returns an empty array if the passed array is nullptr/empty.
static MessagePortArray* entanglePorts(
ExecutionContext&,
std::unique_ptr<MessagePortChannelArray>);
bool started() const { return m_started; }
const AtomicString& interfaceName() const override;
ExecutionContext* getExecutionContext() const override {
return ContextLifecycleObserver::getExecutionContext();
}
MessagePort* toMessagePort() override { return this; }
// ScriptWrappable implementation.
bool hasPendingActivity() const final;
// ContextLifecycleObserver implementation.
void contextDestroyed(ExecutionContext*) override { close(); }
void setOnmessage(EventListener* listener) {
setAttributeEventListener(EventTypeNames::message, listener);
start();
}
EventListener* onmessage() {
return getAttributeEventListener(EventTypeNames::message);
}
// A port starts out its life entangled, and remains entangled until it is
// closed or is cloned.
bool isEntangled() const { return !m_closed && !isNeutered(); }
// A port gets neutered when it is transferred to a new owner via
// postMessage().
bool isNeutered() const { return !m_entangledChannel; }
// For testing only: allows inspection of the entangled channel.
WebMessagePortChannel* entangledChannelForTesting() const {
return m_entangledChannel.get();
}
DECLARE_VIRTUAL_TRACE();
protected:
explicit MessagePort(ExecutionContext&);
bool tryGetMessage(RefPtr<SerializedScriptValue>& message,
std::unique_ptr<MessagePortChannelArray>& channels);
private:
// WebMessagePortChannelClient implementation.
void messageAvailable() override;
void dispatchMessages();
WebMessagePortChannelUniquePtr m_entangledChannel;
bool m_started;
bool m_closed;
};
} // namespace blink
#endif // MessagePort_h
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