121 lines
3.9 KiB
Java
121 lines
3.9 KiB
Java
/*
|
|
* Copyright (c) 2012, 2022, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation. Oracle designates this
|
|
* particular file as subject to the "Classpath" exception as provided
|
|
* by Oracle in the LICENSE file that accompanied this code.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
package javacserver.util;
|
|
|
|
import java.io.PrintWriter;
|
|
import java.io.StringWriter;
|
|
import java.io.Writer;
|
|
|
|
/**
|
|
* Utility class only for javacserver logging.
|
|
*
|
|
* Logging in javacserver has special requirements when running in server/client
|
|
* mode. Most of the log messages is generated server-side, but the server
|
|
* is typically spawned by the client in the background, so the user usually
|
|
* does not see the server stdout/stderr. For this reason log messages needs
|
|
* to relayed back to the client that performed the request that generated the
|
|
* log message. To support this use case this class maintains a per-thread log
|
|
* instance so that each connected client can have its own instance that
|
|
* relays messages back to the requesting client.
|
|
*
|
|
* On the client-side there will typically just be one Log instance.
|
|
*/
|
|
public class Log {
|
|
public enum Level {
|
|
ERROR,
|
|
WARN,
|
|
INFO,
|
|
DEBUG,
|
|
TRACE;
|
|
}
|
|
|
|
private static Log stdOutErr = new Log(new PrintWriter(System.out), new PrintWriter(System.err));
|
|
private static ThreadLocal<Log> logger = new ThreadLocal<>();
|
|
|
|
protected PrintWriter err; // Used for error and warning messages
|
|
protected PrintWriter out; // Used for other messages
|
|
protected Level level = Level.INFO;
|
|
|
|
public Log(Writer out, Writer err) {
|
|
this.out = out == null ? null : new PrintWriter(out, true);
|
|
this.err = err == null ? null : new PrintWriter(err, true);
|
|
}
|
|
|
|
public static void setLogForCurrentThread(Log log) {
|
|
logger.set(log);
|
|
}
|
|
|
|
public static void setLogLevel(Level l) {
|
|
get().level = l;
|
|
}
|
|
|
|
public static void debug(String msg) {
|
|
log(Level.DEBUG, msg);
|
|
}
|
|
|
|
public static void debug(Throwable t) {
|
|
log(Level.DEBUG, t);
|
|
}
|
|
|
|
public static void error(String msg) {
|
|
log(Level.ERROR, msg);
|
|
}
|
|
|
|
public static void error(Throwable t) {
|
|
log(Level.ERROR, t);
|
|
}
|
|
|
|
public static void log(Level l, String msg) {
|
|
get().printLogMsg(l, msg);
|
|
}
|
|
|
|
public static void log(Level l, Throwable t) {
|
|
StringWriter sw = new StringWriter();
|
|
t.printStackTrace(new PrintWriter(sw, true));
|
|
log(l, sw.toString());
|
|
}
|
|
|
|
public static boolean isDebugging() {
|
|
return get().isLevelLogged(Level.DEBUG);
|
|
}
|
|
|
|
protected boolean isLevelLogged(Level l) {
|
|
return l.ordinal() <= level.ordinal();
|
|
}
|
|
|
|
public static Log get() {
|
|
Log log = logger.get();
|
|
return log != null ? log : stdOutErr;
|
|
}
|
|
|
|
protected void printLogMsg(Level msgLevel, String msg) {
|
|
if (isLevelLogged(msgLevel)) {
|
|
PrintWriter pw = msgLevel.ordinal() <= Level.WARN.ordinal() ? err : out;
|
|
pw.println(msg);
|
|
}
|
|
}
|
|
}
|