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/*
* Copyright (c) 2021 Cisco and/or 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 <hicn/transport/utils/branch_prediction.h>
#include <hicn/transport/utils/noncopyable.h>
#include <hicn/transport/utils/spinlock.h>
#include <deque>
#include <memory>
#include <mutex>
namespace utils {
template <typename T>
class ObjectPool : private utils::NonCopyable {
class ObjectDeleter {
public:
ObjectDeleter(ObjectPool<T> *pool = nullptr) : pool_(pool) {}
void operator()(T *t) {
if (pool_) {
pool_->add(t);
} else {
delete t;
}
}
private:
ObjectPool<T> *pool_;
};
public:
using Ptr = std::shared_ptr<T>;
ObjectPool() : destructor_(false) {}
ObjectPool(ObjectPool &&other)
: object_pool_lock_(std::move(other.object_pool_lock_)),
object_pool_(std::move(other.object_pool_)),
destructor_(other.destructor_) {}
ObjectPool &operator=(ObjectPool &&other) {
if (this != &other) {
object_pool_lock_ = std::move(other.object_pool_lock_);
object_pool_ = std::move(other.object_pool_);
destructor_ = other.destructor_;
}
return *this;
}
~ObjectPool() {
destructor_ = true;
for (auto &ptr : object_pool_) {
ptr.reset();
}
}
bool empty() {
utils::SpinLock::Acquire locked(object_pool_lock_);
return object_pool_.empty();
}
std::pair<bool, Ptr> get() {
utils::SpinLock::Acquire locked(object_pool_lock_);
if (object_pool_.empty()) {
return std::make_pair<bool, Ptr>(false, nullptr);
}
auto ret = std::move(object_pool_.front());
object_pool_.pop_front();
return std::make_pair<bool, Ptr>(true, std::move(ret));
}
void add(T *object) {
utils::SpinLock::Acquire locked(object_pool_lock_);
if (TRANSPORT_EXPECT_TRUE(!destructor_)) {
object_pool_.emplace_front(makePtr(object));
} else {
delete object;
}
}
Ptr makePtr(T *object) { return Ptr(object, ObjectDeleter(this)); }
private:
utils::SpinLock object_pool_lock_;
std::deque<Ptr> object_pool_;
std::atomic<bool> destructor_;
};
} // namespace utils
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