151 lines
4.7 KiB
C++
151 lines
4.7 KiB
C++
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#pragma once
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/*! \file rx-timestamp.hpp
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\brief Returns an observable that attaches a timestamp to each item emitted by the source observable indicating when it was emitted.
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\tparam Coordination the type of the scheduler (optional).
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\param coordination the scheduler to manage timeout for each event (optional).
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\return Observable that emits a pair: { item emitted by the source observable, time_point representing the current value of the clock }.
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\sample
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\snippet timestamp.cpp timestamp sample
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\snippet output.txt timestamp sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_TIMESTAMP_HPP)
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#define RXCPP_OPERATORS_RX_TIMESTAMP_HPP
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#include "../rx-includes.hpp"
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namespace rxcpp {
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namespace operators {
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namespace detail {
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template<class... AN>
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struct timestamp_invalid_arguments {};
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template<class... AN>
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struct timestamp_invalid : public rxo::operator_base<timestamp_invalid_arguments<AN...>> {
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using type = observable<timestamp_invalid_arguments<AN...>, timestamp_invalid<AN...>>;
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};
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template<class... AN>
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using timestamp_invalid_t = typename timestamp_invalid<AN...>::type;
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template<class T, class Coordination>
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struct timestamp
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{
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typedef rxu::decay_t<T> source_value_type;
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typedef rxu::decay_t<Coordination> coordination_type;
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struct timestamp_values {
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timestamp_values(coordination_type c)
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: coordination(c)
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{
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}
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coordination_type coordination;
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};
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timestamp_values initial;
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timestamp(coordination_type coordination)
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: initial(coordination)
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{
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}
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template<class Subscriber>
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struct timestamp_observer
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{
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typedef timestamp_observer<Subscriber> this_type;
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typedef source_value_type value_type;
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typedef rxu::decay_t<Subscriber> dest_type;
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typedef observer<value_type, this_type> observer_type;
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dest_type dest;
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coordination_type coord;
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timestamp_observer(dest_type d, coordination_type coordination)
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: dest(std::move(d)),
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coord(std::move(coordination))
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{
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}
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void on_next(source_value_type v) const {
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dest.on_next(std::make_pair(v, coord.now()));
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}
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void on_error(rxu::error_ptr e) const {
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dest.on_error(e);
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}
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void on_completed() const {
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dest.on_completed();
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}
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static subscriber<value_type, observer_type> make(dest_type d, timestamp_values v) {
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return make_subscriber<value_type>(d, this_type(d, v.coordination));
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}
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};
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template<class Subscriber>
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auto operator()(Subscriber dest) const
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-> decltype(timestamp_observer<Subscriber>::make(std::move(dest), initial)) {
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return timestamp_observer<Subscriber>::make(std::move(dest), initial);
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}
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};
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}
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/*! @copydoc rx-timestamp.hpp
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*/
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template<class... AN>
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auto timestamp(AN&&... an)
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-> operator_factory<timestamp_tag, AN...> {
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return operator_factory<timestamp_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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}
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template<>
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struct member_overload<timestamp_tag>
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{
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template<class Observable,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class Timestamp = rxo::detail::timestamp<SourceValue, identity_one_worker>,
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class Clock = typename rxsc::scheduler::clock_type::time_point,
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class Value = std::pair<SourceValue, Clock>>
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static auto member(Observable&& o)
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-> decltype(o.template lift<Value>(Timestamp(identity_current_thread()))) {
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return o.template lift<Value>(Timestamp(identity_current_thread()));
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}
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template<class Observable, class Coordination,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>,
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is_coordination<Coordination>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class Timestamp = rxo::detail::timestamp<SourceValue, rxu::decay_t<Coordination>>,
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class Clock = typename rxsc::scheduler::clock_type::time_point,
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class Value = std::pair<SourceValue, Clock>>
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static auto member(Observable&& o, Coordination&& cn)
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-> decltype(o.template lift<Value>(Timestamp(std::forward<Coordination>(cn)))) {
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return o.template lift<Value>(Timestamp(std::forward<Coordination>(cn)));
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}
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template<class... AN>
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static operators::detail::timestamp_invalid_t<AN...> member(AN...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "timestamp takes (optional Coordination)");
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}
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};
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}
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#endif
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