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// Copyright 2015 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 CHROMEOS_BINDER_COMMAND_BROKER_H_
#define CHROMEOS_BINDER_COMMAND_BROKER_H_
#include <utility>
#include "base/basictypes.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/thread_checker.h"
#include "chromeos/binder/command_stream.h"
namespace binder {
class Driver;
class TransactionData;
// Issues appropriate outgoing commands to perform required tasks, and
// dispatches incoming commands to appropriate objects.
// Usually this class lives as long as the corresponding thread.
// TODO(hashimoto): Add code to handle incoming commands (e.g. transactions).
class CommandBroker : public CommandStream::IncomingCommandHandler {
public:
explicit CommandBroker(Driver* driver);
~CommandBroker() override;
// Performs transaction with the remote object specified by the handle.
// Returns true on success. If not one-way transaction, this method blocks
// until the target object sends a reply.
bool Transact(int32 handle,
const TransactionData& request,
scoped_ptr<TransactionData>* reply);
// CommandStream::IncomingCommandHandler override:
void OnReply(scoped_ptr<TransactionData> data) override;
void OnDeadReply() override;
void OnTransactionComplete() override;
void OnFailedReply() override;
private:
enum ResponseType {
RESPONSE_TYPE_NONE,
RESPONSE_TYPE_TRANSACTION_COMPLETE,
RESPONSE_TYPE_TRANSACTION_REPLY,
RESPONSE_TYPE_FAILED,
RESPONSE_TYPE_DEAD,
};
// Waits for a response to the previous transaction.
ResponseType WaitForResponse(scoped_ptr<TransactionData>* data);
base::ThreadChecker thread_checker_;
CommandStream command_stream_;
ResponseType response_type_ = RESPONSE_TYPE_NONE;
scoped_ptr<TransactionData> response_data_;
DISALLOW_COPY_AND_ASSIGN(CommandBroker);
};
} // namespace binder
#endif // CHROMEOS_BINDER_COMMAND_BROKER_H_
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