276 lines
12 KiB
C++
276 lines
12 KiB
C++
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// 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-buffer_time_count.hpp
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\brief Return an observable that emits connected, non-overlapping buffers of items from the source observable that were emitted during a fixed duration of time or when the buffer has reached maximum capacity (whichever occurs first), on the specified scheduler.
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\tparam Duration the type of the time interval.
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\tparam Coordination the type of the scheduler (optional).
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\param period the period of time each buffer collects items before it is emitted and replaced with a new buffer.
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\param count the maximum size of each buffer before it is emitted and new buffer is created.
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\param coordination the scheduler for the buffers (optional).
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\return Observable that emits connected, non-overlapping buffers of items from the source observable that were emitted during a fixed duration of time or when the buffer has reached maximum capacity (whichever occurs first).
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\sample
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\snippet buffer.cpp buffer period+count+coordination sample
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\snippet output.txt buffer period+count+coordination sample
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\sample
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\snippet buffer.cpp buffer period+count sample
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\snippet output.txt buffer period+count sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_BUFFER_WITH_TIME_OR_COUNT_HPP)
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#define RXCPP_OPERATORS_RX_BUFFER_WITH_TIME_OR_COUNT_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 buffer_with_time_or_count_invalid_arguments {};
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template<class... AN>
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struct buffer_with_time_or_count_invalid : public rxo::operator_base<buffer_with_time_or_count_invalid_arguments<AN...>> {
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using type = observable<buffer_with_time_or_count_invalid_arguments<AN...>, buffer_with_time_or_count_invalid<AN...>>;
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};
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template<class... AN>
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using buffer_with_time_or_count_invalid_t = typename buffer_with_time_or_count_invalid<AN...>::type;
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template<class T, class Duration, class Coordination>
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struct buffer_with_time_or_count
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{
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typedef rxu::decay_t<T> source_value_type;
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typedef std::vector<source_value_type> value_type;
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typedef rxu::decay_t<Coordination> coordination_type;
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typedef typename coordination_type::coordinator_type coordinator_type;
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typedef rxu::decay_t<Duration> duration_type;
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struct buffer_with_time_or_count_values
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{
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buffer_with_time_or_count_values(duration_type p, int n, coordination_type c)
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: period(p)
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, count(n)
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, coordination(c)
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{
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}
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duration_type period;
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int count;
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coordination_type coordination;
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};
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buffer_with_time_or_count_values initial;
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buffer_with_time_or_count(duration_type period, int count, coordination_type coordination)
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: initial(period, count, coordination)
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{
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}
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template<class Subscriber>
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struct buffer_with_time_or_count_observer
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{
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typedef buffer_with_time_or_count_observer<Subscriber> this_type;
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typedef std::vector<T> 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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struct buffer_with_time_or_count_subscriber_values : public buffer_with_time_or_count_values
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{
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buffer_with_time_or_count_subscriber_values(composite_subscription cs, dest_type d, buffer_with_time_or_count_values v, coordinator_type c)
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: buffer_with_time_or_count_values(std::move(v))
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, cs(std::move(cs))
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, dest(std::move(d))
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, coordinator(std::move(c))
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, worker(coordinator.get_worker())
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, chunk_id(0)
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{
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}
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composite_subscription cs;
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dest_type dest;
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coordinator_type coordinator;
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rxsc::worker worker;
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mutable int chunk_id;
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mutable value_type chunk;
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};
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typedef std::shared_ptr<buffer_with_time_or_count_subscriber_values> state_type;
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state_type state;
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buffer_with_time_or_count_observer(composite_subscription cs, dest_type d, buffer_with_time_or_count_values v, coordinator_type c)
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: state(std::make_shared<buffer_with_time_or_count_subscriber_values>(buffer_with_time_or_count_subscriber_values(std::move(cs), std::move(d), std::move(v), std::move(c))))
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{
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auto new_id = state->chunk_id;
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auto produce_time = state->worker.now() + state->period;
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auto localState = state;
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auto disposer = [=](const rxsc::schedulable&){
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localState->cs.unsubscribe();
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localState->dest.unsubscribe();
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localState->worker.unsubscribe();
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};
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auto selectedDisposer = on_exception(
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[&](){return localState->coordinator.act(disposer);},
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localState->dest);
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if (selectedDisposer.empty()) {
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return;
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}
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localState->dest.add([=](){
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localState->worker.schedule(selectedDisposer.get());
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});
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localState->cs.add([=](){
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localState->worker.schedule(selectedDisposer.get());
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});
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//
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// The scheduler is FIFO for any time T. Since the observer is scheduling
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// on_next/on_error/oncompleted the timed schedule calls must be resheduled
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// when they occur to ensure that production happens after on_next/on_error/oncompleted
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//
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localState->worker.schedule(produce_time, [new_id, produce_time, localState](const rxsc::schedulable&){
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localState->worker.schedule(produce_buffer(new_id, produce_time, localState));
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});
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}
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static std::function<void(const rxsc::schedulable&)> produce_buffer(int id, rxsc::scheduler::clock_type::time_point expected, state_type state) {
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auto produce = [id, expected, state](const rxsc::schedulable&) {
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if (id != state->chunk_id)
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return;
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state->dest.on_next(state->chunk);
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state->chunk.resize(0);
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auto new_id = ++state->chunk_id;
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auto produce_time = expected + state->period;
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state->worker.schedule(produce_time, [new_id, produce_time, state](const rxsc::schedulable&){
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state->worker.schedule(produce_buffer(new_id, produce_time, state));
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});
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};
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auto selectedProduce = on_exception(
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[&](){return state->coordinator.act(produce);},
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state->dest);
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if (selectedProduce.empty()) {
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return std::function<void(const rxsc::schedulable&)>();
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}
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return std::function<void(const rxsc::schedulable&)>(selectedProduce.get());
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}
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void on_next(T v) const {
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auto localState = state;
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auto work = [v, localState](const rxsc::schedulable& self){
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localState->chunk.push_back(v);
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if (int(localState->chunk.size()) == localState->count) {
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produce_buffer(localState->chunk_id, localState->worker.now(), localState)(self);
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}
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};
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auto selectedWork = on_exception(
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[&](){return localState->coordinator.act(work);},
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localState->dest);
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if (selectedWork.empty()) {
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return;
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}
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localState->worker.schedule(selectedWork.get());
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}
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void on_error(rxu::error_ptr e) const {
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auto localState = state;
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auto work = [e, localState](const rxsc::schedulable&){
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localState->dest.on_error(e);
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};
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auto selectedWork = on_exception(
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[&](){return localState->coordinator.act(work);},
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localState->dest);
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if (selectedWork.empty()) {
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return;
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}
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localState->worker.schedule(selectedWork.get());
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}
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void on_completed() const {
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auto localState = state;
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auto work = [localState](const rxsc::schedulable&){
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localState->dest.on_next(localState->chunk);
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localState->dest.on_completed();
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};
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auto selectedWork = on_exception(
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[&](){return localState->coordinator.act(work);},
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localState->dest);
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if (selectedWork.empty()) {
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return;
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}
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localState->worker.schedule(selectedWork.get());
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}
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static subscriber<T, observer<T, this_type>> make(dest_type d, buffer_with_time_or_count_values v) {
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auto cs = composite_subscription();
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auto coordinator = v.coordination.create_coordinator();
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return make_subscriber<T>(cs, this_type(cs, std::move(d), std::move(v), std::move(coordinator)));
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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(buffer_with_time_or_count_observer<Subscriber>::make(std::move(dest), initial)) {
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return buffer_with_time_or_count_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-buffer_time_count.hpp
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*/
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template<class... AN>
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auto buffer_with_time_or_count(AN&&... an)
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-> operator_factory<buffer_with_time_or_count_tag, AN...> {
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return operator_factory<buffer_with_time_or_count_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<buffer_with_time_or_count_tag>
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{
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template<class Observable, class Duration,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>,
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std::is_convertible<Duration, rxsc::scheduler::clock_type::duration>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class BufferTimeCount = rxo::detail::buffer_with_time_or_count<SourceValue, rxu::decay_t<Duration>, identity_one_worker>,
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class Value = rxu::value_type_t<BufferTimeCount>>
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static auto member(Observable&& o, Duration&& period, int count)
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-> decltype(o.template lift<Value>(BufferTimeCount(std::forward<Duration>(period), count, identity_current_thread()))) {
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return o.template lift<Value>(BufferTimeCount(std::forward<Duration>(period), count, identity_current_thread()));
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}
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template<class Observable, class Duration, 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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std::is_convertible<Duration, rxsc::scheduler::clock_type::duration>,
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is_coordination<Coordination>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class BufferTimeCount = rxo::detail::buffer_with_time_or_count<SourceValue, rxu::decay_t<Duration>, rxu::decay_t<Coordination>>,
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class Value = rxu::value_type_t<BufferTimeCount>>
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static auto member(Observable&& o, Duration&& period, int count, Coordination&& cn)
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-> decltype(o.template lift<Value>(BufferTimeCount(std::forward<Duration>(period), count, std::forward<Coordination>(cn)))) {
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return o.template lift<Value>(BufferTimeCount(std::forward<Duration>(period), count, std::forward<Coordination>(cn)));
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}
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template<class... AN>
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static operators::detail::buffer_with_time_or_count_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, "buffer_with_time_or_count takes (Duration, Count, optional Coordination)");
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}
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};
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}
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#endif
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