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