?? logger.java
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// Logger.java// $Id: Logger.java,v 1.6 2003/05/13 17:48:55 ylafon Exp $// (c) COPYRIGHT MIT and INRIA, 1996.// Please first read the full copyright statement in file COPYRIGHT.htmlpackage org.w3c.jigsaw.http ;/** * The Logger class is the abstract class that loggers must implement. * You can (should be able to) use several loggers at the same time. */abstract public class Logger { /** * Log normally a full handled request. * @param client The client which made the request. * @param request The request that was handled. * @param reply The emitted reply to the client. * @param nbytes The number of bytes sent to this client. * @param duration The time it took to process the request. */ abstract public void log (Request request , Reply reply , int nbytes , long duration) ; /** * Log a message to the log. * @param msg The message to log. */ abstract public void log(String msg); /** * Log an error on behalf of some client object in the error log. * @param client The client for which the error occured. * @param msg The error message to log. */ abstract public void errlog (Client client, String msg) ; /** * Log an error on behalf of the server object. * @param msg The message to emit. */ abstract public void errlog (String msg) ; /** * Log a client trace. The client may be in some error state, so all access * to the client parameter should be checked. * @param client The client that wants to emit a trace. * @param trace The trace to log. */ abstract public void trace (Client client, String trace) ; /** * Log a server trace. * @param msg The trace to emit. */ abstract public void trace (String msg) ; /** * Flush any in core logger state back to disk. * Some loggers may use memory cache before writing any data to the disk * this method ensures that there state is saved to stable storage. */ abstract public void sync(); /** * Shutdown this logger object. * Each server will close the shutdown method of the logger before * shuting itself down. */ abstract public void shutdown() ; /** * Initialize this logger for the provided server. * No call to any methods of the logger will be made before this * logger is initialized for some server. * @param server The server to which this logger should be initialized. */ abstract public void initialize (httpd server) ; /** * Construct a new Logger instance. */ public Logger () { }}
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