diff --git a/.gitignore b/.gitignore
index 253e16b..6e95f64 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ out/
 build/
 .cache/
 compile_commands.json
+.gdb_history
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 981d316..5393138 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -167,7 +167,7 @@ set(TILE_SRCS
     "tile/base/internal/thread_pool.cc"
     "tile/base/internal/time_keeper.cc"
     "tile/base/internal/time_keeper.h"
-    # logging
+    "tile/base/logging/basic_file_sink.cc"
     "tile/base/logging/splitter_sink.cc"
     "tile/base/logging/console_sink.cc"
     "tile/base/net/endpoint.cc"
diff --git a/tile/base/internal/logging.cc b/tile/base/internal/logging.cc
index 21c00d2..2e81ab9 100644
--- a/tile/base/internal/logging.cc
+++ b/tile/base/internal/logging.cc
@@ -99,7 +99,7 @@ public:
       ++g_num_messages[severity_];
       WaitForSinks();
       if (sink_) {
-        sink_->WaitTillSent();
+        sink_->Flush();
       }
     }
 
@@ -141,7 +141,7 @@ private:
 
   void SendToSink() {
     if (sink_) {
-      sink_->send(severity_, fullname(), basename(), line(), time(),
+      sink_->Send(severity_, fullname(), basename(), line(), time(),
                   message_text_ + num_prefix_chars_,
                   num_chars_to_log_ - num_prefix_chars_ - 1);
     }
@@ -278,14 +278,15 @@ void LogMessageTime::CalcGmtOffset() {
 }
 
 LogSink::~LogSink() {}
-void LogSink::send(LogSeverity severity, const char *full_filename,
+bool LogSink::ShouldLog(LogSeverity severity) { return true; }
+void LogSink::Send(LogSeverity severity, const char *full_filename,
                    const char *base_filename, int line,
                    const LogMessageTime &logmsgtime, const char *message,
                    size_t message_len) {
 
   // do nothing
 }
-void LogSink::WaitTillSent() {}
+void LogSink::Flush() {}
 
 std::string LogSink::ToString(LogSeverity severity, const char *file,
                               const char *base_filename, int line,
@@ -356,14 +357,16 @@ void LogToSinks(LogSeverity severity, const char *full_filename,
                 const char *message, size_t message_len) {
   std::lock_guard<std::mutex> _(g_sink_mutex);
   for (auto &&sink : g_sinks) {
-    sink->send(severity, full_filename, base_filename, line, time, message,
-               message_len);
+    if (sink->ShouldLog(severity)) {
+      sink->Send(severity, full_filename, base_filename, line, time, message,
+                 message_len);
+    }
   }
 }
 void WaitForSinks() {
   std::lock_guard<std::mutex> _(g_sink_mutex);
   for (auto &&sink : g_sinks) {
-    sink->WaitTillSent();
+    sink->Flush();
   }
 }
 
diff --git a/tile/base/internal/logging.h b/tile/base/internal/logging.h
index 92900f2..e39c94f 100644
--- a/tile/base/internal/logging.h
+++ b/tile/base/internal/logging.h
@@ -700,16 +700,15 @@ public:
   using Ptr = std::shared_ptr<LogSink>;
 
   virtual ~LogSink();
-  virtual void send(LogSeverity severity, const char *full_filename,
+  virtual bool ShouldLog(LogSeverity severity);
+  virtual void Send(LogSeverity severity, const char *full_filename,
                     const char *base_filename, int line,
                     const LogMessageTime &logmsgtime, const char *message,
                     size_t message_len);
-  virtual void WaitTillSent();
-
-  virtual std::string ToString(LogSeverity severity, const char *file,
-                               const char *base_filename, int line,
-                               const LogMessageTime &logmsgtime,
-                               const char *message, size_t message_len);
+  virtual void Flush();
+  std::string ToString(LogSeverity severity, const char *file, int line,
+                       const LogMessageTime &logmsgtime, const char *message,
+                       size_t message_len);
 };
 
 void ColoredWriteToStdout(LogSeverity severity, const char *message,
diff --git a/tile/base/internal/logging_test.cc b/tile/base/internal/logging_test.cc
index 6d94cf9..878baae 100644
--- a/tile/base/internal/logging_test.cc
+++ b/tile/base/internal/logging_test.cc
@@ -9,7 +9,7 @@
 #include <thread>
 
 struct AwesomeLogSink : public tile::LogSink {
-  virtual void send(tile::LogSeverity severity, const char *full_filename,
+  virtual void Send(tile::LogSeverity severity, const char *full_filename,
                     const char *base_filename, int line,
                     const tile::LogMessageTime &logmsgtime, const char *message,
                     size_t message_len) override {
diff --git a/tile/base/internal/sinks/splitter_sink.h b/tile/base/internal/sinks/splitter_sink.h
deleted file mode 100644
index e69de29..0000000
diff --git a/tile/base/logging/basic_file_sink.cc b/tile/base/logging/basic_file_sink.cc
new file mode 100644
index 0000000..938e1fa
--- /dev/null
+++ b/tile/base/logging/basic_file_sink.cc
@@ -0,0 +1,19 @@
+#include "tile/base/logging/basic_file_sink.h"
+
+namespace tile {
+BasicFileSink::BasicFileSink() {}
+BasicFileSink::~BasicFileSink() {}
+void BasicFileSink::Send(LogSeverity severity, const char *full_filename,
+                         const char *base_filename, int line,
+                         const LogMessageTime &logmsgtime, const char *message,
+                         size_t message_len) {
+  TILE_CHECK(!filepath_.empty(), "filepath is empty");
+  ofs_ << message << std::endl;
+}
+std::string BasicFileSink::filepath() const { return filepath_; }
+void BasicFileSink::set_filepath(const std::string &filepath) {
+  filepath_ = filepath;
+  ofs_.open(filepath, std::ios::out | std::ios::app);
+}
+void BasicFileSink::Flush() { ofs_.flush(); }
+} // namespace tile
diff --git a/tile/base/logging/basic_file_sink.h b/tile/base/logging/basic_file_sink.h
new file mode 100644
index 0000000..db7d76b
--- /dev/null
+++ b/tile/base/logging/basic_file_sink.h
@@ -0,0 +1,31 @@
+#ifndef TILE_BASE_LOGGING_BASIC_FILE_SINK_H
+#define TILE_BASE_LOGGING_BASIC_FILE_SINK_H
+
+#pragma once
+#include "tile/base/internal/logging.h"
+
+#include <mutex>
+#include <set>
+
+namespace tile {
+class BasicFileSink : public LogSink {
+public:
+  BasicFileSink();
+  ~BasicFileSink() override;
+  void Send(LogSeverity severity, const char *full_filename,
+            const char *base_filename, int line,
+            const LogMessageTime &logmsgtime, const char *message,
+            size_t message_len) override;
+  void Flush() override;
+
+  std::string filepath() const;
+  void set_filepath(const std::string &filepath);
+
+private:
+  std::string filepath_;
+  std::ofstream ofs_;
+};
+
+} // namespace tile
+
+#endif // TILE_BASE_LOGGING_BASIC_FILE_SINK_H
diff --git a/tile/base/logging/splitter_sink.cc b/tile/base/logging/splitter_sink.cc
index a2f54a1..e658d94 100644
--- a/tile/base/logging/splitter_sink.cc
+++ b/tile/base/logging/splitter_sink.cc
@@ -17,7 +17,7 @@ std::shared_ptr<SplitterSink> SplitterSink::Create(
 
 SplitterSink::SplitterSink() {}
 SplitterSink::~SplitterSink() {}
-void SplitterSink::send(LogSeverity severity, const char *full_filename,
+void SplitterSink::Send(LogSeverity severity, const char *full_filename,
                         const char *base_filename, int line,
                         const LogMessageTime &logmsgtime, const char *message,
                         size_t message_len) {
@@ -25,18 +25,18 @@ void SplitterSink::send(LogSeverity severity, const char *full_filename,
   std::lock_guard<std::mutex> _(sinks_mutex_);
   doing_ = true;
   for (auto &sink : sinks_) {
-    sink->send(severity, full_filename, base_filename, line, logmsgtime,
+    sink->Send(severity, full_filename, base_filename, line, logmsgtime,
                message, message_len);
   }
   doing_ = false;
 }
 
-void SplitterSink::WaitTillSent() {
+void SplitterSink::Flush() {
   assert(!doing_ && "SplitterSink::send() should not be called recursively");
   std::lock_guard<std::mutex> _(sinks_mutex_);
   doing_ = true;
   for (auto &sink : sinks_) {
-    sink->WaitTillSent();
+    sink->Flush();
   }
   doing_ = false;
 }
diff --git a/tile/base/logging/splitter_sink.h b/tile/base/logging/splitter_sink.h
index aae5640..082c29a 100644
--- a/tile/base/logging/splitter_sink.h
+++ b/tile/base/logging/splitter_sink.h
@@ -1,3 +1,7 @@
+#ifndef TILE_BASE_LOGGING_SPLITTER_SINK_H
+#define TILE_BASE_LOGGING_SPLITTER_SINK_H
+
+#pragma once
 #include "tile/base/internal/logging.h"
 
 #include <mutex>
@@ -12,11 +16,11 @@ public:
 
   ~SplitterSink() override;
 
-  void send(LogSeverity severity, const char *full_filename,
+  void Send(LogSeverity severity, const char *full_filename,
             const char *base_filename, int line,
             const LogMessageTime &logmsgtime, const char *message,
             size_t message_len) override;
-  void WaitTillSent() override;
+  void Flush() override;
 
   void AddSink(std::shared_ptr<LogSink> sink);
   void RemoveSink(std::shared_ptr<LogSink> sink);
@@ -32,3 +36,5 @@ private:
   bool doing_ = false;
 };
 } // namespace tile
+
+#endif // TILE_BASE_LOGGING_SPLITTER_SINK_H