1 2 /** 3 * Copyright (C) 2018-present MongoDB, Inc. 4 * 5 * This program is free software: you can redistribute it and/or modify 6 * it under the terms of the Server Side Public License, version 1, 7 * as published by MongoDB, Inc. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * Server Side Public License for more details. 13 * 14 * You should have received a copy of the Server Side Public License 15 * along with this program. If not, see 16 * <http://www.mongodb.com/licensing/server-side-public-license>. 17 * 18 * As a special exception, the copyright holders give permission to link the 19 * code of portions of this program with the OpenSSL library under certain 20 * conditions as described in each individual source file and distribute 21 * linked combinations including the program with the OpenSSL library. You 22 * must comply with the Server Side Public License in all respects for 23 * all of the code used other than as permitted herein. If you modify file(s) 24 * with this exception, you may extend this exception to your version of the 25 * file(s), but you are not obligated to do so. If you do not wish to do so, 26 * delete this exception statement from your version. If you delete this 27 * exception statement from all source files in the program, then also delete 28 * it in the license file. 29 */ 30 31 #pragma once 32 33 #include "mongo/base/status.h" 34 35 namespace mongo { 36 namespace logger { 37 38 /** 39 * Interface for sinks in a logging system. The core of logging is when events of type E are 40 * appended to instances of Appender<E>. 41 * 42 * Example concrete instances are ConsoleAppender<E>, SyslogAppender<E> and 43 * RotatableFileAppender<E>. 44 */ 45 template <typename E> 46 class Appender { 47 public: 48 typedef E Event; 49 ~Appender()50 virtual ~Appender() {} 51 52 /** 53 * Appends "event", returns Status::OK() on success. 54 */ 55 virtual Status append(const Event& event) = 0; 56 }; 57 58 } // namespace logger 59 } // namespace mongo 60