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// Copyright (C) 2019 The Android Open Source Project
//
// 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.
#ifndef IORAP_SRC_COMMON_RX_ASYNC_H_
#define IORAP_SRC_COMMON_RX_ASYNC_H_
#include "common/async_pool.h"
#include <rxcpp/rx.hpp>
namespace iorap::common {
// Helper functions to operate with rx chains asynchronously.
class RxAsync {
public:
// Subscribe to the observable on a new thread asynchronously.
// If no observe_on/subscribe_on is used, the chain will execute
// on that new thread.
//
// Returns the composite_subscription which can be used to
// unsubscribe from if we want to abort the chain early.
template <typename T, typename U>
static rxcpp::composite_subscription SubscribeAsync(
AsyncPool& async_pool,
T&& observable,
U&& subscriber) {
rxcpp::composite_subscription subscription;
async_pool.LaunchAsync([subscription, // safe copy: ref-counted
observable=std::forward<T>(observable),
subscriber=std::forward<U>(subscriber)]() mutable {
observable
.as_blocking()
.subscribe(subscription,
std::forward<decltype(subscriber)>(subscriber));
});
return subscription;
}
template <typename T, typename U, typename E>
static rxcpp::composite_subscription SubscribeAsync(
AsyncPool& async_pool,
T&& observable,
U&& on_next,
E&& on_error) {
rxcpp::composite_subscription subscription;
async_pool.LaunchAsync([subscription, // safe copy: ref-counted
observable=std::forward<T>(observable),
on_next=std::forward<U>(on_next),
on_error=std::forward<E>(on_error)]() mutable {
observable
.as_blocking()
.subscribe(subscription,
std::forward<decltype(on_next)>(on_next),
std::forward<decltype(on_error)>(on_error));
});
return subscription;
}
};
} // namespace iorap::common
#endif // IORAP_SRC_COMMON_RX_ASYNC_H_
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