111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
/*
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* Copyright (C) 2018 Max Kellermann <max.kellermann@gmail.com>
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*
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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
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* are met:
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*
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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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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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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
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ODBUS_ASYNC_REQUEST_HXX
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#define ODBUS_ASYNC_REQUEST_HXX
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#include "PendingCall.hxx"
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#include "Message.hxx"
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#include <functional>
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#include <assert.h>
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namespace ODBus {
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/**
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* Helper class which makes sending messages and receiving the
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* response asynchronously easy.
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*
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* Remember to always cancel pending operations before destructing
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* this class.
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*/
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class AsyncRequest {
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PendingCall pending_call;
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std::function<void(Message) noexcept> callback;
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public:
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operator bool() const noexcept {
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return pending_call;
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}
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/**
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* Send a message on the specified connection and invoke the
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* given callback upon completion (or error).
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*
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* The callback should invoke Message::CheckThrowError() to
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* check for errors.
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*
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* This object must be kept around until the operation
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* completes. It can only be reused after completion.
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*/
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template<typename F>
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void Send(DBusConnection &connection,
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DBusMessage &message,
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int timeout_milliseconds,
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F &&_callback) {
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assert(!pending_call);
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callback = std::forward<F>(_callback);
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pending_call = PendingCall::SendWithReply(&connection,
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&message,
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timeout_milliseconds);
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pending_call.SetNotify(Notify, this);
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}
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template<typename F>
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void Send(DBusConnection &connection,
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DBusMessage &message,
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F &&_callback) {
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Send(connection, message, -1, std::forward<F>(_callback));
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}
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void Cancel() {
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pending_call.Cancel();
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}
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private:
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void Notify(DBusPendingCall *pending) noexcept {
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assert(pending_call.Get() == pending);
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pending_call = {};
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std::exchange(callback, {})(Message::StealReply(*pending));
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}
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static void Notify(DBusPendingCall *pending,
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void *user_data) noexcept {
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auto &ar = *(AsyncRequest *)user_data;
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ar.Notify(pending);
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}
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};
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} /* namespace ODBus */
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#endif
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