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// Copyright 2013 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.
#ifndef MOJO_PUBLIC_BINDINGS_LIB_CONNECTOR_H_
#define MOJO_PUBLIC_BINDINGS_LIB_CONNECTOR_H_
#include "mojo/public/bindings/lib/bindings_support.h"
#include "mojo/public/bindings/lib/message.h"
#include "mojo/public/bindings/lib/message_queue.h"
#include "mojo/public/system/core_cpp.h"
namespace mojo {
// The Connector class is responsible for performing read/write operations on a
// MessagePipe. It writes messages it receives through the MessageReceiver
// interface that it subclasses, and it forwards messages it reads through the
// MessageReceiver interface assigned as its incoming receiver.
//
// NOTE: MessagePipe I/O is non-blocking.
//
class Connector : public MessageReceiver {
public:
// The Connector takes ownership of |message_pipe|.
explicit Connector(ScopedMessagePipeHandle message_pipe);
virtual ~Connector();
// Sets the receiver to handle messages read from the message pipe. The
// Connector will only read messages from the pipe if an incoming receiver
// has been set.
void SetIncomingReceiver(MessageReceiver* receiver);
// Returns true if an error was encountered while reading from or writing to
// the message pipe.
bool EncounteredError() const { return error_; }
// MessageReceiver implementation:
virtual bool Accept(Message* message) MOJO_OVERRIDE;
private:
class Callback : public BindingsSupport::AsyncWaitCallback {
public:
Callback();
virtual ~Callback();
void SetOwnerToNotify(Connector* owner);
void SetAsyncWaitID(BindingsSupport::AsyncWaitID async_wait_id);
virtual void OnHandleReady(MojoResult result) MOJO_OVERRIDE;
private:
Connector* owner_;
BindingsSupport::AsyncWaitID async_wait_id_;
};
friend class Callback;
void OnHandleReady(Callback* callback, MojoResult result);
void WaitToReadMore();
void WaitToWriteMore();
void ReadMore();
void WriteMore();
void WriteOne(Message* message, bool* wait_to_write);
ScopedMessagePipeHandle message_pipe_;
MessageReceiver* incoming_receiver_;
MessageQueue write_queue_;
Callback read_callback_;
Callback write_callback_;
bool error_;
MOJO_DISALLOW_COPY_AND_ASSIGN(Connector);
};
} // namespace mojo
#endif // MOJO_PUBLIC_BINDINGS_LIB_CONNECTOR_H_
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