| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| // |
| // Simple pool of objects that will be deallocated when the pool is |
| // destroyed |
| |
| #ifndef KUDU_UTIL_AUTO_RELEASE_POOL_H |
| #define KUDU_UTIL_AUTO_RELEASE_POOL_H |
| |
| #include <vector> |
| |
| #include "kudu/gutil/spinlock.h" |
| |
| namespace kudu { |
| |
| // Thread-safe. |
| class AutoReleasePool { |
| public: |
| AutoReleasePool(): objects_() { } |
| |
| ~AutoReleasePool() { |
| for (auto& object : objects_) { |
| delete object; |
| } |
| } |
| |
| template <class T> |
| T *Add(T *t) { |
| base::SpinLockHolder l(&lock_); |
| objects_.push_back(new SpecificElement<T>(t)); |
| return t; |
| } |
| |
| // Add an array-allocated object to the pool. This is identical to |
| // Add() except that it will be freed with 'delete[]' instead of 'delete'. |
| template<class T> |
| T* AddArray(T *t) { |
| base::SpinLockHolder l(&lock_); |
| objects_.push_back(new SpecificArrayElement<T>(t)); |
| return t; |
| } |
| |
| // Donate all objects in this pool to another pool. |
| void DonateAllTo(AutoReleasePool* dst) { |
| base::SpinLockHolder l(&lock_); |
| base::SpinLockHolder l_them(&dst->lock_); |
| |
| dst->objects_.reserve(dst->objects_.size() + objects_.size()); |
| dst->objects_.insert(dst->objects_.end(), objects_.begin(), objects_.end()); |
| objects_.clear(); |
| } |
| |
| private: |
| struct GenericElement { |
| virtual ~GenericElement() {} |
| }; |
| |
| template <class T> |
| struct SpecificElement : GenericElement { |
| explicit SpecificElement(T *t): t(t) {} |
| ~SpecificElement() { |
| delete t; |
| } |
| |
| T *t; |
| }; |
| |
| template <class T> |
| struct SpecificArrayElement : GenericElement { |
| explicit SpecificArrayElement(T *t): t(t) {} |
| ~SpecificArrayElement() { |
| delete [] t; |
| } |
| |
| T *t; |
| }; |
| |
| typedef std::vector<GenericElement *> ElementVector; |
| ElementVector objects_; |
| base::SpinLock lock_; |
| }; |
| |
| |
| } // namespace kudu |
| #endif |