Mbed OS Reference | KVMap.h Source File

 /*
  * Copyright (c) 2018 ARM Limited. All rights reserved.
  * SPDX-License-Identifier: Apache-2.0
  * 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 _KV_MAP
 #define _KV_MAP
 
 #include "kvstore/KVStore.h"
 #include "platform/PlatformMutex.h"
 #include "platform/SingletonPtr.h"
 #include "blockdevice/BlockDevice.h"
 #include "filesystem/FileSystem.h"
 
 namespace mbed {
 
 #define  MAX_ATTACHED_KVS 3
 
 /**
  * This structure represent a KVStore partition configuration
  */
 typedef struct {
     /**
      * A Pointer to main instance of the KVStore partition.
      * This is also the instance KVStore global API should work with.
      * This must not be NULL in a working partition configuration.
      */
     KVStore *kvstore_main_instance;
     /**
      * A pointer Internal store of the KVStore partition.
      * If no rollback protection is required the pointer may be NULL.
      */
     KVStore *internal_store;
     /**
      * A pointer external store of the KVStore partition.
      * The pointer can be NULL if external store has been omitted
      */
     KVStore *external_store;
     /**
      * A pointer Internal FlashIAP BlockDevice of the KVStore partition.
      * The pointer can be NULL if internal store has been omitted
      */
     BlockDevice *internal_bd;
     /**
      * A pointer external BlockDevice of the KVStore partition.
      * The pointer can be NULL if external store has been omitted
      */
     BlockDevice *external_bd;
     /**
      * A pointer external FileSystem of the KVStore partition.
      * The pointer can be NULL if FileSystemStore has not been configured.
      */
     FileSystem *external_fs;
     /**
      * This is a flag masking value for the KVStore global API.
      * The Global API will mask the input flags base on this value to
      * prevent errors in case the user choose an different security level.
      */
     uint32_t flags_mask;
 } kvstore_config_t;
 
 /**
  * This structure maps between a string name and a partition configuration.
  */
 typedef struct {
     /**
       * Partition name string
       */
     char *partition_name;
     /**
      * Configuration struct.
      */
     kvstore_config_t *kv_config;
 } kv_map_entry_t;
 
 /** KVMap class
  *
  *  Singleton class to manage the mapping of KVStore partition and its naming.
  */
 class KVMap : private mbed::NonCopyable<KVMap> {
 public:
 
     /**
      * @brief As a singleton, return the single instance of the class.
      *        This class is a singleton for the following reasons:
      *        - Ease of use, so you don't have to coordinate instantiations.
      *        - Lazy instantiation of internal data, (which we can't achieve with simple static classes).
      *
      * @returns Singleton instance reference.
      */
     static KVMap &get_instance()
     {
         // Use this implementation of singleton (Meyer's) rather than the one that allocates
         // the instance on the heap because it ensures destruction at program end (preventing warnings
         // from memory checking tools, such as valgrind).
         static KVMap instance;
         return instance;
     }
 
     ~KVMap();
 
     /**
      * @brief Initializes KVMap
      *
      * @return 0 on success, negative error code on failure
      */
     int init();
 
     /**
      * @brief Attach a KVStore partition configuration, and add it to the KVMap array
      *
      * @param partition_name String parameter contains the partition name.
      * @param kv_config A configuration struct created by the kv_config or by the user.
      * @return 0 on success, negative error code on failure
      */
     int attach(const char *partition_name, kvstore_config_t *kv_config);
 
     /**
      * @brief Detach a KVStore partition configuration from the KVMap array,
      *        and deinitialize its components
      *
      * @param partition_name String parameter contains the partition name.
      * @return 0 on success, negative error code on failure
      */
     int detach(const char *partition_name);
 
     /**
      * @brief Deinitialize the KVMap array, and deinitialize all the attached partitions.
      *
      * @return 0 on success, negative error code on failure
      */
     int deinit();
 
     /**
      * @brief Full name lookup, and then break it into KVStore instance and key
      *
      * @param[in] full_name  String parameter contains the partition name to look for.
      *                   The String should be formated as follow "/partition name/key". The key is optional.
      * @param[out] kv_instance Returns the main KVStore instance associated with the required partition name.
      * @param[out] key_index Returns an index to the first character of the key.
      * @param[out] flags_mask Return the flag masking for the current configuration
      * @return 0 on success, negative error code on failure
      */
     int lookup(const char *full_name, mbed::KVStore **kv_instance, size_t *key_index, uint32_t *flags_mask = NULL);
 
     /**
      * @brief Getter for the internal KVStore instance.
      *
      * @param name String parameter contains the /partition name/.
      *
      * @return Pointer to the internal kvstore on success,
      *         NULL on failure or if not exist
      */
     KVStore *get_internal_kv_instance(const char *name);
     /**
      * @brief Getter for the external KVStore instance.
      *
      * @param name String parameter contains the /partition name/.
      *
      * @return Pointer to the external kvstore on success,
      *         NULL on failure or if not exist
      */
     KVStore *get_external_kv_instance(const char *name);
     /**
      * @brief Getter for the main KVStore instance.
      *
      * @param name String parameter contains the /partition name/.
      *
      * @return Pointer to the main kvstore on success,
      *         NULL on failure or if not exist
      */
     KVStore *get_main_kv_instance(const char *name);
     /**
      * @brief Getter for the internal BlockDevice instance.
      *
      * @param name String parameter contains the /partition name/.
      *
      * @return Pointer to the internal BlockDevice on success,
      *         NULL on failure or if not exist
      */
     BlockDevice *get_internal_blockdevice_instance(const char *name);
     /**
      * @brief Getter for the external BlockDevice instance.
      *
      * @param name String parameter contains the /partition name/.
      *
      * @return Pointer to the external BlockDevice on success,
      *         NULL on failure or if not exist
      */
     BlockDevice *get_external_blockdevice_instance(const char *name);
     /**
      * @brief Getter for the external FileSystem instance.
      *
      * @param name String parameter contains the /partition name/.
      *
      * @return Pointer to the external FileSystem on success,
      *         NULL on failure or if not exist
      */
     FileSystem *get_external_filesystem_instance(const char *name);
 
 #if !defined(DOXYGEN_ONLY)
 private:
 
     /**
      * @brief Deinitialize all components of a partition configuration struct.
      *
      * @param partition  Partition configuration struct.
      */
     void deinit_partition(kv_map_entry_t *partition);
 
     /**
      * @brief Full name lookup, and then break it into KVStore config and key
      *
      * @param[in] full_name  String parameter contains the /partition name/key.
      * @param[out] kv_config Returns The configuration struct associated with the partition name
      * @param[out] key_index Returns an index to the first character of the key.
      * @return 0 on success, negative error code on failure
      */
     int config_lookup(const char *full_name, kvstore_config_t **kv_config, size_t *key_index);
 
     // Attachment table
     kv_map_entry_t _kv_map_table[MAX_ATTACHED_KVS];
     int _kv_num_attached_kvs;
     int _is_initialized;
     SingletonPtr<PlatformMutex> _mutex;
 #endif
 };
 }
 #endif
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