| /** |
| * |
| * 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. |
| */ |
| #ifndef LIBMINIFI_INCLUDE_CORE_REPOSITORY_VOLATILECONTENTREPOSITORY_H_ |
| #define LIBMINIFI_INCLUDE_CORE_REPOSITORY_VOLATILECONTENTREPOSITORY_H_ |
| |
| #include <map> |
| #include <memory> |
| #include <string> |
| |
| #include "core/Core.h" |
| #include "AtomicRepoEntries.h" |
| #include "io/AtomicEntryStream.h" |
| #include "../ContentRepository.h" |
| #include "core/repository/VolatileRepository.h" |
| #include "properties/Configure.h" |
| #include "core/Connectable.h" |
| #include "core/logging/LoggerConfiguration.h" |
| namespace org { |
| namespace apache { |
| namespace nifi { |
| namespace minifi { |
| namespace core { |
| namespace repository { |
| |
| /** |
| * Purpose: Stages content into a volatile area of memory. Note that when the maximum number |
| * of entries is consumed we will rollback a session to wait for others to be freed. |
| */ |
| class VolatileContentRepository : public core::ContentRepository, public virtual core::repository::VolatileRepository<ResourceClaim::Path> { |
| public: |
| static const char *minimal_locking; |
| |
| explicit VolatileContentRepository(std::string name = getClassName<VolatileContentRepository>()) |
| : core::SerializableComponent(name), |
| core::repository::VolatileRepository<ResourceClaim::Path>(name), |
| minimize_locking_(true), |
| logger_(logging::LoggerFactory<VolatileContentRepository>::getLogger()) { |
| max_count_ = 15000; |
| } |
| virtual ~VolatileContentRepository() { |
| logger_->log_debug("Clearing repository"); |
| if (!minimize_locking_) { |
| std::lock_guard<std::mutex> lock(map_mutex_); |
| for (const auto &item : master_list_) { |
| delete item.second; |
| } |
| master_list_.clear(); |
| } |
| } |
| |
| /** |
| * Initialize the volatile content repo |
| * @param configure configuration |
| */ |
| virtual bool initialize(const std::shared_ptr<Configure> &configure); |
| |
| /** |
| * Stop any thread associated with the volatile content repository. |
| */ |
| virtual void stop(); |
| |
| /** |
| * Creates writable stream. |
| * @param claim resource claim |
| * @return BaseStream shared pointer that represents the stream the consumer will write to. |
| */ |
| virtual std::shared_ptr<io::BaseStream> write(const minifi::ResourceClaim &claim, bool append); |
| |
| /** |
| * Creates readable stream. |
| * @param claim resource claim |
| * @return BaseStream shared pointer that represents the stream from which the consumer will read.. |
| */ |
| virtual std::shared_ptr<io::BaseStream> read(const minifi::ResourceClaim &claim); |
| |
| virtual bool exists(const minifi::ResourceClaim &streamId); |
| |
| /** |
| * Closes the claim. |
| * @return whether or not the claim is associated with content stored in volatile memory. |
| */ |
| virtual bool close(const minifi::ResourceClaim &claim) { |
| return remove(claim); |
| } |
| |
| /** |
| * Closes the claim. |
| * @return whether or not the claim is associated with content stored in volatile memory. |
| */ |
| virtual bool remove(const minifi::ResourceClaim &claim); |
| |
| protected: |
| virtual void start(); |
| |
| virtual void run(); |
| |
| template<typename T2> |
| std::shared_ptr<T2> shared_from_parent() { |
| return std::dynamic_pointer_cast<T2>(shared_from_this()); |
| } |
| |
| private: |
| bool minimize_locking_; |
| |
| // mutex and master list that represent a cache of Atomic entries. this exists so that we don't have to walk the atomic entry list. |
| // The idea is to reduce the computational complexity while keeping access as maximally lock free as we can. |
| std::mutex map_mutex_; |
| |
| std::map<ResourceClaim::Path, AtomicEntry<ResourceClaim::Path>*> master_list_; |
| |
| // logger |
| std::shared_ptr<logging::Logger> logger_; |
| }; |
| |
| } // namespace repository |
| } // namespace core |
| } // namespace minifi |
| } // namespace nifi |
| } // namespace apache |
| } // namespace org |
| |
| #endif // LIBMINIFI_INCLUDE_CORE_REPOSITORY_VOLATILECONTENTREPOSITORY_H_ |