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* Copyright (C) 2009 Google Inc. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef MessagePortChannel_h
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#define MessagePortChannel_h
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#include "PlatformString.h"
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#include <wtf/OwnPtr.h>
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#include <wtf/PassOwnPtr.h>
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#include <wtf/PassRefPtr.h>
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#include <wtf/RefCounted.h>
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#include <wtf/RefPtr.h>
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class MessagePortChannel;
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class PlatformMessagePortChannel;
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class ScriptExecutionContext;
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// The overwhelmingly common case is sending a single port, so handle that efficiently with an inline buffer of size 1.
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typedef Vector<OwnPtr<MessagePortChannel>, 1> MessagePortChannelArray;
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// MessagePortChannel is a platform-independent interface to the remote side of a message channel.
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// It acts as a wrapper around the platform-dependent PlatformMessagePortChannel implementation which ensures that the platform-dependent close() method is invoked before destruction.
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class MessagePortChannel : public Noncopyable {
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static void createChannel(PassRefPtr<MessagePort>, PassRefPtr<MessagePort>);
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// Creates a new wrapper for the passed channel.
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static PassOwnPtr<MessagePortChannel> create(PassRefPtr<PlatformMessagePortChannel>);
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// Entangles the channel with a port (called when a port has been cloned, after the clone has been marshalled to its new owning thread and is ready to receive messages).
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// Returns false if the entanglement failed because the port was closed.
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bool entangleIfOpen(MessagePort*);
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// Disentangles the channel from a given port so it no longer forwards messages to the port. Called when the port is being cloned and no new owning thread has yet been established.
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// Closes the port (ensures that no further messages can be added to either queue).
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// Used by MessagePort.postMessage() to prevent callers from passing a port's own entangled port.
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bool isConnectedTo(MessagePort*);
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// Returns true if the proxy currently contains messages for this port.
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bool hasPendingActivity();
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static PassOwnPtr<EventData> create(const String&, PassOwnPtr<MessagePortChannelArray>);
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const String& message() { return m_message; }
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PassOwnPtr<MessagePortChannelArray> channels() { return m_channels.release(); }
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EventData(const String& message, PassOwnPtr<MessagePortChannelArray>);
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OwnPtr<MessagePortChannelArray> m_channels;
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// Sends a message and optional cloned port to the remote port.
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void postMessageToRemote(PassOwnPtr<EventData>);
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// Extracts a message from the message queue for this port.
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bool tryGetMessageFromRemote(OwnPtr<EventData>&);
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// Returns the entangled port if run by the same thread (see MessagePort::locallyEntangledPort() for more details).
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MessagePort* locallyEntangledPort(const ScriptExecutionContext*);
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~MessagePortChannel();
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PlatformMessagePortChannel* channel() const { return m_channel.get(); }
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MessagePortChannel(PassRefPtr<PlatformMessagePortChannel>);
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RefPtr<PlatformMessagePortChannel> m_channel;
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} // namespace WebCore
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#endif // MessagePortChannel_h