Add close and init to binary writer

core-buffer/src/BinaryWriter.cpp

@@ -1,10 +1,20 @@
 #include "BinaryWriter.hpp"
+#include <unistd.h>
+#include <iostream>
+#include "date.h"
+#include <cerrno>
+#include <chrono>
+#include <cstring>
+
+using namespace std;
 
 BinaryWriter::BinaryWriter(
-        const std::string& device_name,
-        const std::string& root_folder) :
+        const string& device_name,
+        const string& root_folder) :
             device_name_(device_name),
-            root_folder_(root_folder)
+            root_folder_(root_folder),
+            current_filename_(""),
+            output_fd_(-1)
 {
 
 }
@@ -14,7 +24,21 @@ void BinaryWriter::write(uint64_t pulse_id, const JFFileFormat& buffer)
 
 }
 
-void BinaryWriter::close()
+void BinaryWriter::close_current_file()
 {
+    if (output_fd_ != -1) {
+        if (close(output_fd_) < 0) {
+            stringstream err_msg;
 
+            using namespace date;
+            using namespace chrono;
+            err_msg << "[" << system_clock::now() << "]";
+            err_msg << "[BinaryWriter::close_current_file]";
+            err_msg << " Error while closing file ";
+            err_msg << current_filename_ << ": ";
+            err_msg << strerror(errno) << endl;
+
+            throw runtime_error(err_msg.str());
+        }
+    }
 }