Add TsSeqKeyValue::isset.

tddb/td/db/SeqKeyValue.h

@@ -32,6 +32,7 @@ class SeqKeyValue {
     }
     return next_seq_no();
   }
+
   SeqNo erase(const string &key) {
     auto it = map_.find(key);
     if (it == map_.end()) {
@@ -40,9 +41,11 @@ class SeqKeyValue {
     map_.erase(it);
     return next_seq_no();
   }
+
   SeqNo seq_no() const {
     return current_id_ + 1;
   }
+
   string get(const string &key) const {
     auto it = map_.find(key);
     if (it == map_.end()) {
@@ -51,6 +54,14 @@ class SeqKeyValue {
     return it->second;
   }
 
+  bool isset(const string &key) const {
+    auto it = map_.find(key);
+    if (it == map_.end()) {
+      return false;
+    }
+    return true;
+  }
+
   size_t size() const {
     return map_.size();
   }

tddb/td/db/TsSeqKeyValue.h

@@ -33,29 +33,41 @@ class TsSeqKeyValue {
     auto lock = rw_mutex_.lock_write().move_as_ok();
     return kv_.set(key, value);
   }
+
   std::pair<SeqNo, RwMutex::WriteLock> set_and_lock(Slice key, Slice value) {
     auto lock = rw_mutex_.lock_write().move_as_ok();
     return std::make_pair(kv_.set(key, value), std::move(lock));
   }
+
   SeqNo erase(const string &key) {
     auto lock = rw_mutex_.lock_write().move_as_ok();
     return kv_.erase(key);
   }
+
   std::pair<SeqNo, RwMutex::WriteLock> erase_and_lock(const string &key) {
     auto lock = rw_mutex_.lock_write().move_as_ok();
     return std::make_pair(kv_.erase(key), std::move(lock));
   }
+
   string get(const string &key) {
     auto lock = rw_mutex_.lock_read().move_as_ok();
     return kv_.get(key);
   }
+
+  bool isset(const string &key) {
+    auto lock = rw_mutex_.lock_read().move_as_ok();
+    return kv_.isset(key);
+  }
+
   size_t size() const {
     return kv_.size();
   }
+
   std::unordered_map<string, string> get_all() {
     auto lock = rw_mutex_.lock_write().move_as_ok();
     return kv_.get_all();
   }
+
   // not thread safe method
   SeqKeyValue &inner() {
     return kv_;