Add TableOptions for BlockBasedTableFactory

We are having more and more options to specify for this table so it makes sense to have a TableOptions for future extension.

table/block_based_table_factory.cc

@@ -29,7 +29,8 @@ Status BlockBasedTableFactory::GetTableReader(
 TableBuilder* BlockBasedTableFactory::GetTableBuilder(
     const Options& options, WritableFile* file,
     CompressionType compression_type) const {
-  auto flush_block_policy_factory = flush_block_policy_factory_.get();
+  auto flush_block_policy_factory = 
+    table_options_.flush_block_policy_factory.get();
 
   // if flush block policy factory is not set, we'll create the default one
   // from the options.
@@ -54,7 +55,8 @@ TableBuilder* BlockBasedTableFactory::GetTableBuilder(
   // options.
   // We can safely delete flush_block_policy_factory since it will only be used
   // during the construction of `BlockBasedTableBuilder`.
-  if (flush_block_policy_factory != flush_block_policy_factory_.get()) {
+  if (flush_block_policy_factory != 
+      table_options_.flush_block_policy_factory.get()) {
     delete flush_block_policy_factory;
   }
 

table/block_based_table_factory.h

@@ -31,14 +31,18 @@ class BlockBasedTableBuilder;
 
 class BlockBasedTableFactory: public TableFactory {
 public:
-  // @flush_block_policy_factory creates the instances of flush block policy.
+  struct TableOptions {
-  // which provides a configurable way to determine when to flush a block in
+    // @flush_block_policy_factory creates the instances of flush block policy.
-  // the block based tables.  If not set, table builder will use the default
+    // which provides a configurable way to determine when to flush a block in
-  // block flush policy, which cut blocks by block size (please refer to
+    // the block based tables.  If not set, table builder will use the default
-  // `FlushBlockBySizePolicy`).
+    // block flush policy, which cut blocks by block size (please refer to
-  BlockBasedTableFactory(
+    // `FlushBlockBySizePolicy`).
-      FlushBlockPolicyFactory* flush_block_policy_factory = nullptr) :
+    std::shared_ptr<FlushBlockPolicyFactory> flush_block_policy_factory;
-      flush_block_policy_factory_(flush_block_policy_factory) {
+  };
+
+  BlockBasedTableFactory() : BlockBasedTableFactory(TableOptions()) { }
+  BlockBasedTableFactory(const TableOptions& table_options): 
+      table_options_(table_options) { 
   }
 
   ~BlockBasedTableFactory() {
@@ -58,7 +62,8 @@ public:
                                     override;
 
  private:
-  std::unique_ptr<FlushBlockPolicyFactory> flush_block_policy_factory_;
+  TableOptions table_options_;
 };
 
+
 }  // namespace rocksdb