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// Copyright 2022 gRPC authors.
//
// 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 GRPC_SRC_CORE_LIB_CHANNEL_CALL_FINALIZATION_H
#define GRPC_SRC_CORE_LIB_CHANNEL_CALL_FINALIZATION_H
#include <grpc/support/port_platform.h>
#include <utility>
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/promise/context.h"
#include "src/core/lib/resource_quota/arena.h"
namespace grpc_core {
// Call finalization context.
// Sometimes a filter needs to perform some operation after the last byte of
// data is flushed to the wire. This context is used to perform that
// finalization.
// Filters can register a finalizer by calling Add().
// The finalizer will be called before the call is destroyed but after
// the top level promise is completed.
class CallFinalization {
public:
// Add a step to the finalization context.
// Takes a callable with a signature compatible with:
// (const grpc_call_final_info*) -> void.
// Finalizers are run in the reverse order they are added.
template <typename F>
void Add(F&& t) {
first_ =
GetContext<Arena>()->New<FuncFinalizer<F>>(std::forward<F>(t), first_);
}
void Run(const grpc_call_final_info* final_info) {
if (Finalizer* f = std::exchange(first_, nullptr)) f->Run(final_info);
}
private:
// Base class for finalizer implementations.
class Finalizer {
public:
// Run the finalizer and call the destructor of this Finalizer.
virtual void Run(const grpc_call_final_info* final_info) = 0;
protected:
~Finalizer() {}
};
// Specialization for callable objects.
template <typename F>
class FuncFinalizer final : public Finalizer {
public:
FuncFinalizer(F&& f, Finalizer* next)
: next_(next), f_(std::forward<F>(f)) {}
void Run(const grpc_call_final_info* final_info) override {
f_(final_info);
Finalizer* next = next_;
this->~FuncFinalizer();
if (next != nullptr) next->Run(final_info);
}
private:
Finalizer* next_;
F f_;
};
// The first finalizer in the chain.
Finalizer* first_ = nullptr;
};
template <>
struct ContextType<CallFinalization> {};
} // namespace grpc_core
#endif // GRPC_SRC_CORE_LIB_CHANNEL_CALL_FINALIZATION_H
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