refactor(db): refactor options

Former-commit-id: 53812504248a4a81f2f65ee07e81ad2d5e31eb38

cpp/src/db/DBImpl.cpp

@@ -19,7 +19,7 @@ DBImpl::DBImpl(const Options& options_, const std::string& name_)
       _options(options_),
       _bg_compaction_scheduled(false),
       _shutting_down(false),
-      _pMeta(new meta::DBMetaImpl(*(_options.pMetaOptions))),
+      _pMeta(new meta::DBMetaImpl(_options.meta)),
       _pMemMgr(new MemManager(_pMeta)) {
     start_timer_task(options_.memory_sync_interval);
 }

cpp/src/db/DBMetaImpl.h

@@ -45,7 +45,7 @@ private:
 
     Status initialize();
 
-    const DBMetaOptions& _options;
+    const DBMetaOptions _options;
 
 }; // DBMetaImpl
 

cpp/src/db/Options.cpp

 #include "Options.h"
 #include "Env.h"
+#include "DBMetaImpl.h"
 
 namespace zilliz {
 namespace vecwise {

cpp/src/db/Options.h

@@ -7,16 +7,25 @@ namespace zilliz {
 namespace vecwise {
 namespace engine {
 
-class MetaOptions;
 class Env;
 
+struct MetaOptions {
+}; // MetaOptions
+
+
+struct DBMetaOptions : public MetaOptions {
+    std::string backend_uri;
+    std::string dbname;
+}; // DBMetaOptions
+
+
 struct Options {
     Options();
     uint16_t  memory_sync_interval = 10;
     uint16_t  raw_file_merge_trigger_number = 100;
     size_t  raw_to_index_trigger_size = 100000;
-    std::shared_ptr<MetaOptions> pMetaOptions;
     Env* env;
+    DBMetaOptions meta;
 }; // Options
 
 
@@ -26,16 +35,6 @@ struct GroupOptions {
 }; // GroupOptions
 
 
-struct MetaOptions {
-}; // MetaOptions
-
-
-struct DBMetaOptions : public MetaOptions {
-    std::string backend_uri;
-    std::string dbname;
-}; // DBMetaOptions
-
-
 } // namespace engine
 } // namespace vecwise
 } // namespace zilliz