support doubly skiplist (#338)

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>

Update `ColumnFamilyOptions` to support `DoublySkipList` in memtable.

librocksdb_sys/crocksdb/c.cc

@@ -2631,6 +2631,13 @@ void crocksdb_options_set_memtable_huge_page_size(crocksdb_options_t* opt,
                                                  size_t v) {
   opt->rep.memtable_huge_page_size = v;
 }
+const char* crocksdb_options_get_memtable_factory_name(
+    crocksdb_options_t *opt) {
+  if (!opt->rep.memtable_factory) {
+     return nullptr;
+  }
+  return opt->rep.memtable_factory->Name();
+}
 
 void crocksdb_options_set_hash_skip_list_rep(
     crocksdb_options_t *opt, size_t bucket_count,
@@ -2645,6 +2652,11 @@ void crocksdb_options_set_hash_link_list_rep(
   opt->rep.memtable_factory.reset(rocksdb::NewHashLinkListRepFactory(bucket_count));
 }
 
+void crocksdb_options_set_doubly_skip_list_rep(crocksdb_options_t *opt) {
+  rocksdb::MemTableRepFactory* factory = new rocksdb::DoublySkipListFactory();
+  opt->rep.memtable_factory.reset(factory);
+}
+
 void crocksdb_options_set_plain_table_factory(
     crocksdb_options_t *opt, uint32_t user_key_len, int bloom_bits_per_key,
     double hash_table_ratio, size_t index_sparseness) {

librocksdb_sys/crocksdb/crocksdb/c.h

@@ -1024,6 +1024,7 @@ crocksdb_options_set_delete_obsolete_files_period_micros(crocksdb_options_t*,
                                                         uint64_t);
 extern C_ROCKSDB_LIBRARY_API void crocksdb_options_prepare_for_bulk_load(
     crocksdb_options_t*);
+extern C_ROCKSDB_LIBRARY_API const char* crocksdb_options_get_memtable_factory_name(crocksdb_options_t *opt);
 extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_memtable_vector_rep(
     crocksdb_options_t*);
 extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_memtable_prefix_bloom_size_ratio(
@@ -1034,6 +1035,7 @@ extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_hash_skip_list_rep(
     crocksdb_options_t*, size_t, int32_t, int32_t);
 extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_hash_link_list_rep(
     crocksdb_options_t*, size_t);
+extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_doubly_skip_list_rep(crocksdb_options_t *opt);
 extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_plain_table_factory(
     crocksdb_options_t*, uint32_t, int, double, size_t);
 

rocksdb @ a29144f8

-Subproject commit 862b680230647774c6825d6278de22d68a0be909
+Subproject commit a29144f8e992c36f429d74603c43cb22fbead616

librocksdb_sys/src/lib.rs

@@ -479,12 +479,14 @@ extern "C" {
     pub fn crocksdb_options_set_keep_log_file_num(options: *mut Options, num: size_t);
     pub fn crocksdb_options_set_recycle_log_file_num(options: *mut Options, num: size_t);
     pub fn crocksdb_options_set_max_manifest_file_size(options: *mut Options, bytes: u64);
+    pub fn crocksdb_options_get_memtable_factory_name(options: *mut Options) -> *const c_char;
     pub fn crocksdb_options_set_hash_skip_list_rep(
         options: *mut Options,
         bytes: u64,
         a1: i32,
         a2: i32,
     );
+    pub fn crocksdb_options_set_doubly_skip_list_rep(options: *mut Options);
     pub fn crocksdb_options_set_compaction_style(options: *mut Options, cs: DBCompactionStyle);
     pub fn crocksdb_options_set_fifo_compaction_options(
         options: *mut Options,

src/rocksdb_options.rs

@@ -33,6 +33,7 @@ use std::ffi::{CStr, CString};
 use std::mem;
 use std::path::Path;
 use std::ptr;
+use std::ptr::null;
 use std::sync::Arc;
 use table_filter::{destroy_table_filter, table_filter, TableFilter};
 use table_properties_collector_factory::{
@@ -1030,6 +1031,23 @@ impl DBOptions {
             crocksdb_ffi::crocksdb_options_set_paranoid_checks(self.inner, enable as u8);
         }
     }
+
+    pub fn set_doubly_skiplist(&self) {
+        unsafe {
+            crocksdb_ffi::crocksdb_options_set_doubly_skip_list_rep(self.inner);
+        }
+    }
+
+    pub fn get_memtable_name(&self) -> Option<&str> {
+        unsafe {
+            let memtable_name =
+                crocksdb_ffi::crocksdb_options_get_memtable_factory_name(self.inner);
+            if memtable_name.is_null() {
+                return None;
+            }
+            Some(CStr::from_ptr(memtable_name).to_str().unwrap())
+        }
+    }
 }
 
 pub struct ColumnFamilyOptions {
@@ -1515,6 +1533,23 @@ impl ColumnFamilyOptions {
             crocksdb_ffi::crocksdb_options_set_vector_memtable_factory(self.inner, reserved_bytes);
         }
     }
+
+    pub fn set_doubly_skiplist(&self) {
+        unsafe {
+            crocksdb_ffi::crocksdb_options_set_doubly_skip_list_rep(self.inner);
+        }
+    }
+
+    pub fn get_memtable_factory_name(&self) -> Option<&str> {
+        unsafe {
+            let memtable_name =
+                crocksdb_ffi::crocksdb_options_get_memtable_factory_name(self.inner);
+            if memtable_name.is_null() {
+                return None;
+            }
+            Some(CStr::from_ptr(memtable_name).to_str().unwrap())
+        }
+    }
 }
 
 // ColumnFamilyDescriptor is a pair of column family's name and options.

tests/cases/test_column_family.rs

@@ -147,3 +147,14 @@ fn test_provided_merge(
     }
     result
 }
+
+#[test]
+pub fn test_column_family_option_use_doubly_skiplist() {
+    let mut cf_opts = ColumnFamilyOptions::new();
+    let memtable_name = cf_opts.get_memtable_factory_name();
+    assert!(memtable_name.is_some());
+    assert_eq!("SkipListFactory", memtable_name.unwrap());
+    cf_opts.set_doubly_skiplist();
+    let memtable_name = cf_opts.get_memtable_factory_name();
+    assert_eq!("DoublySkipListFactory", memtable_name.unwrap());
+}