88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
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// Copyright (c) Facebook, Inc. and its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "yarpl/Refcounted.h"
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namespace yarpl {
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namespace flowable {
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class Subscription {
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public:
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virtual ~Subscription() = default;
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virtual void request(int64_t n) = 0;
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virtual void cancel() = 0;
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static std::shared_ptr<Subscription> create();
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template <typename CancelFunc>
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static std::shared_ptr<Subscription> create(CancelFunc&& onCancel);
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template <typename CancelFunc, typename RequestFunc>
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static std::shared_ptr<Subscription> create(
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CancelFunc&& onCancel,
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RequestFunc&& onRequest);
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};
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namespace detail {
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template <typename CancelFunc, typename RequestFunc>
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class CallbackSubscription : public Subscription {
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static_assert(
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std::is_same<std::decay_t<CancelFunc>, CancelFunc>::value,
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"undecayed");
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static_assert(
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std::is_same<std::decay_t<RequestFunc>, RequestFunc>::value,
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"undecayed");
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public:
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template <typename FCancel, typename FRequest>
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CallbackSubscription(FCancel&& onCancel, FRequest&& onRequest)
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: onCancel_(std::forward<FCancel>(onCancel)),
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onRequest_(std::forward<FRequest>(onRequest)) {}
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void request(int64_t n) override {
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onRequest_(n);
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}
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void cancel() override {
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onCancel_();
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}
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private:
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CancelFunc onCancel_;
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RequestFunc onRequest_;
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};
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} // namespace detail
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template <typename CancelFunc, typename RequestFunc>
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std::shared_ptr<Subscription> Subscription::create(
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CancelFunc&& onCancel,
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RequestFunc&& onRequest) {
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return std::make_shared<detail::CallbackSubscription<
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std::decay_t<CancelFunc>,
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std::decay_t<RequestFunc>>>(
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std::forward<CancelFunc>(onCancel), std::forward<RequestFunc>(onRequest));
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}
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template <typename CancelFunc>
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std::shared_ptr<Subscription> Subscription::create(CancelFunc&& onCancel) {
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return Subscription::create(
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std::forward<CancelFunc>(onCancel), [](int64_t) {});
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}
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} // namespace flowable
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} // namespace yarpl
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