remove unused file (#59)

1.patch

-diff --git a/src/observer/CMakeLists.txt b/src/observer/CMakeLists.txt
-index 1e156f2..37f5f86 100644
---- a/src/observer/CMakeLists.txt
-+++ b/src/observer/CMakeLists.txt
-@@ -24,7 +24,7 @@ FOREACH (F ${ALL_SRC})
- 
- ENDFOREACH (F)
- 
--SET(LIBRARIES common pthread dl event jsoncpp)
-+SET(LIBRARIES common pthread dl event_pthreads event jsoncpp)
- 
- # 指定目标文件位置
- SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/../../bin)
-diff --git a/src/observer/main.cpp b/src/observer/main.cpp
-index 4fff6da..112255e 100644
---- a/src/observer/main.cpp
-+++ b/src/observer/main.cpp
-@@ -137,8 +137,6 @@ void *quit_thread_func(void *_signum)
-   LOG_INFO("Receive signal: %ld", signum);
-   if (g_server) {
-     g_server->shutdown();
--    delete g_server;
--    g_server = nullptr;
-   }
-   return nullptr;
- }
-@@ -169,4 +167,6 @@ int main(int argc, char **argv)
-   LOG_INFO("Server stopped");
- 
-   cleanup();
-+
-+  delete g_server;
- }
-diff --git a/src/observer/net/server.cpp b/src/observer/net/server.cpp
-index e87ad0d..2c6cef6 100644
---- a/src/observer/net/server.cpp
-+++ b/src/observer/net/server.cpp
-@@ -26,6 +26,7 @@ See the Mulan PSL v2 for more details. */
- #include <sys/types.h>
- #include <sys/un.h>
- #include <unistd.h>
-+#include <event2/thread.h>
- 
- #include "common/lang/mutex.h"
- #include "common/log/log.h"
-@@ -411,6 +412,7 @@ int Server::start_unix_socket_server()
- 
- int Server::serve()
- {
-+  evthread_use_pthreads();
-   event_base_ = event_base_new();
-   if (event_base_ == nullptr) {
-     LOG_ERROR("Failed to create event base, %s.", strerror(errno));
-@@ -425,19 +427,6 @@ int Server::serve()
- 
-   event_base_dispatch(event_base_);
- 
--  return 0;
--}
--
--void Server::shutdown()
--{
--  LOG_INFO("Server shutting down");
--
--  // cleanup
--  struct timeval exit_time;
--  gettimeofday(&exit_time, nullptr);
--  exit_time.tv_sec += 10;
--  event_base_loopexit(event_base_, &exit_time);
--
-   if (listen_ev_ != nullptr) {
-     event_del(listen_ev_);
-     event_free(listen_ev_);
-@@ -451,4 +440,16 @@ void Server::shutdown()
- 
-   started_ = false;
-   LOG_INFO("Server quit");
-+  return 0;
-+}
-+
-+void Server::shutdown()
-+{
-+  LOG_INFO("Server shutting down");
-+
-+  // cleanup
-+  if (event_base_ != nullptr && started_) {
-+    started_ = false;
-+    event_base_loopexit(event_base_, nullptr);
-+  }
- }
-