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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/react-native/ReactCommon/jsinspector-modern
Просмотр файла: ScopedExecutor.h
/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <cassert>
#include <functional>
#include <memory>
namespace facebook::react::jsinspector_modern {
/**
* Takes a function and calls it when it is safe to access the Self&
* parameter without locking. The function is not called if
* the underlying Self object is destroyed while the function is pending.
*/
template <typename Self>
using ScopedExecutor =
std::function<void(std::function<void(Self& self)>&& callback)>;
using VoidExecutor = std::function<void(std::function<void()>&& callback)>;
/**
* Creates a ScopedExecutor<Self> from a shared (weak) pointer to Self plus some
* base executor for a "parent" object of Self. The resulting executor will call
* the callback with a valid reference to Self iff Self is still alive.
*/
template <typename Self, typename Parent>
ScopedExecutor<Self> makeScopedExecutor(
std::shared_ptr<Self> self,
ScopedExecutor<Parent> executor) {
return makeScopedExecutor(self, makeVoidExecutor(executor));
}
/**
* Creates a ScopedExecutor<Self> from a shared (weak) pointer to Self plus some
* base executor. The resulting executor will call the callback with a valid
* reference to Self iff Self is still alive.
*/
template <typename Self>
ScopedExecutor<Self> makeScopedExecutor(
std::shared_ptr<Self> self,
VoidExecutor executor) {
return [self = std::weak_ptr(self), executor](auto&& callback) {
executor([self, callback = std::move(callback)]() {
auto lockedSelf = self.lock();
if (!lockedSelf) {
return;
}
callback(*lockedSelf);
});
};
}
/**
* Creates a VoidExecutor from a ScopedExecutor<Self> by ignoring the Self&
* parameter.
*/
template <typename Self>
VoidExecutor makeVoidExecutor(ScopedExecutor<Self> executor) {
return [executor](auto&& callback) {
executor([callback = std::move(callback)](Self&) { callback(); });
};
}
template <typename Self>
class EnableExecutorFromThis : public std::enable_shared_from_this<Self> {
public:
/**
* Returns an executor that can be used to safely invoke methods on Self.
* Must not be called during the constructor of Self.
*/
ScopedExecutor<Self> executorFromThis() {
assert(baseExecutor_);
return makeScopedExecutor(this->shared_from_this(), baseExecutor_);
}
template <typename Other>
void setExecutor(ScopedExecutor<Other> executor) {
setExecutor(makeVoidExecutor(executor));
}
void setExecutor(VoidExecutor executor) {
assert(executor);
assert(!baseExecutor_);
baseExecutor_ = std::move(executor);
}
private:
VoidExecutor baseExecutor_;
};
}; // namespace facebook::react::jsinspector_modern
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