Logger System This project is a customizable Java-based logging system that allows users to store, filter, and manage log messages. It supports logging to files, applying thresholds for file writes, filtering log entries, and user-defined file paths.
📦 Features Log messages of different types: INFO, WARNING, ERROR
Automatically append logs to a file when a threshold is reached
Customize log file name and path
Filter logs by:
Log type
Text in the message
Both type and message content
Print all logs to the console
Automatically create the log file if it doesn't exist
Fallback to default file if custom path fails
🚀 Usage Example java Kopiera Redigera LoggerConfig config = new LoggerConfig(); config.setLogToFile(true); config.setLogThreshold(10); config.setLogFilePath("logs"); config.setLogFileName("logs.txt");
Logger logger = new Logger(new ArrayList<>(), config);
logger.logAppend(LocalDateTime.now(), "Program started", LogType.INFO.toString()); logger.logAppend(LocalDateTime.now(), "This is a warning", LogType.WARNING.toString()); logger.logAppend(LocalDateTime.now(), "Something went wrong!", LogType.ERROR.toString());
logger.filterByType(LogType.ERROR); logger.filterByMessage("warning"); logger.filterByTypeAndMessage(LogType.INFO, "Program"); logger.printAllLogs();
logger.thresholdToLog(config); logger.createLogFile(System.err); 🛠 Class and Method Overview Logger
Method Description logAppend() Appends a new log entry to the in-memory list. filterByType() Prints logs that match a given log type. filterByMessage() Prints logs that contain a specific message string. filterByTypeAndMessage() Filters logs by both type and message content. printAllLogs() Prints all log entries. thresholdToLog() Appends logs to a file only when the number of logs reaches a defined threshold. appendToLog() Appends current logs to the log file. createLogFile() Creates a new log file at a specified path if it doesn't already exist. Includes fallback if path fails. LoggerConfig
Method Description getLogToFile() / setLogToFile() Enable or disable logging to a file. getLogThreshold() / setLogThreshold() Set the number of logs required before they are written to file. getLogFilePath() / setLogFilePath() Define the directory for the log file. getLogFileName() / setLogFileName() Define the name of the log file. LogEntry Represents a single log message with:
Timestamp (LocalDateTime)
Message string
Log type (INFO, WARNING, ERROR)
📁 File Output Log entries are saved to the specified file once the threshold is reached or the file is manually created. If the path is invalid, a fallback file named fallback_logs.txt will be used.
✅ Requirements Java 8 or higher