Adds AuditLogWriter{Serial,Parallel} classes

Furhter those classes will be used to persist (or send) the auditlogs.

src/audit_log_writer_serial.h

@@ -0,0 +1,44 @@
+/*
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+#ifdef __cplusplus
+#include <iostream>
+#include <fstream>
+#include <string>
+#endif
+
+#ifndef SRC_AUDIT_LOG_WRITER_SERIAL_H_
+#define SRC_AUDIT_LOG_WRITER_SERIAL_H_
+
+#include "src/audit_log_writer.h"
+
+#ifdef __cplusplus
+
+namespace ModSecurity {
+
+/** @ingroup ModSecurity_CPP_API */
+class AuditLogWriterSerial : public AuditLogWriter {
+ public:
+    AuditLogWriterSerial() { }
+
+    bool init() override;
+    bool close() override;
+    bool write(const std::string& log) override;
+};
+
+}  // namespace ModSecurity
+#endif
+
+#endif  // SRC_AUDIT_LOG_WRITER_SERIAL_H_