From f4433f28b509a9f67ca85d79000ccf9c2f4b7a24 Mon Sep 17 00:00:00 2001
From: Mauro Sardara <msardara@cisco.com>
Date: Fri, 21 Feb 2020 11:52:28 +0100
Subject: [HICN-534] Major rework on libtransport organization

Change-Id: I361b83a18b4fd59be136d5f0817fc28e17e89884
Signed-off-by: Mauro Sardara <msardara@cisco.com>
---
 .../includes/hicn/transport/utils/object_pool.h    | 90 ++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 libtransport/includes/hicn/transport/utils/object_pool.h

(limited to 'libtransport/includes/hicn/transport/utils/object_pool.h')

diff --git a/libtransport/includes/hicn/transport/utils/object_pool.h b/libtransport/includes/hicn/transport/utils/object_pool.h
new file mode 100644
index 000000000..f78bd2aa2
--- /dev/null
+++ b/libtransport/includes/hicn/transport/utils/object_pool.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2017-2019 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
+
+// TODO
+#include <hicn/transport/utils/branch_prediction.h>
+#include <hicn/transport/utils/spinlock.h>
+
+#include <deque>
+#include <memory>
+#include <mutex>
+
+namespace utils {
+
+template <typename T>
+class ObjectPool {
+  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::unique_ptr<T, ObjectDeleter>;
+
+  ObjectPool() : destructor_(false) {}
+
+  ~ObjectPool() {
+    destructor_ = true;
+    for (auto &ptr : object_pool_) {
+      ptr.reset();
+    }
+  }
+
+  std::pair<bool, Ptr> get() {
+    if (object_pool_.empty()) {
+      return std::make_pair<bool, Ptr>(false, makePtr(nullptr));
+    }
+
+    utils::SpinLock::Acquire locked(object_pool_lock_);
+    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_back(makePtr(object));
+    } else {
+      delete object;
+    }
+  }
+
+  Ptr makePtr(T *object) { return Ptr(object, ObjectDeleter(this)); }
+
+ private:
+  // No copies
+  ObjectPool(const ObjectPool &other) = delete;
+
+  utils::SpinLock object_pool_lock_;
+  std::deque<Ptr> object_pool_;
+  bool destructor_;
+};
+
+}  // namespace utils
\ No newline at end of file
-- 
cgit 1.2.3-korg