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nvs::NVSHandleLocked class
A class which behaves the same as NVSHandleSimple, except that all public member functions are locked. This class follows the decorator design pattern. The reason why we don't want locks in NVSHandleSimple is that NVSHandleSimple can also be used by the C-API which locks its public functions already. Thus, we avoid double-locking.
Syntax
class NVSHandleLocked : public NVSHandle
{
public:
NVSHandleLocked(NVSHandleSimple *handle);
virtual ~NVSHandleLocked();
esp_err_t set_string(const char *key, const char* str) override;
esp_err_t set_blob(const char *key, const void* blob, size_t len) override;
esp_err_t get_string(const char *key, char* out_str, size_t len) override;
esp_err_t get_blob(const char *key, void* out_blob, size_t len) override;
esp_err_t get_item_size(ItemType datatype, const char *key, size_t &size) override;
esp_err_t find_key(const char* key, nvs_type_t &nvstype) override;
esp_err_t erase_item(const char* key) override;
esp_err_t erase_all() override;
esp_err_t commit() override;
esp_err_t get_used_entry_count(size_t& usedEntries) override;
protected:
esp_err_t set_typed_item(ItemType datatype, const char *key, const void* data, size_t dataSize) override;
esp_err_t get_typed_item(ItemType datatype, const char *key, void* data, size_t dataSize) override;
private:
NVSHandleSimple *handle;
};
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