org.glassfish.hk2.utilities.reflection.Logger Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package org.glassfish.hk2.utilities.reflection;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* A logger for HK2. Currently implemented over the JDK logger
*
* @author jwells
*/
public class Logger {
private static final Logger INSTANCE = new Logger();
private static final String HK2_LOGGER_NAME = "org.jvnet.hk2.logger";
private static final boolean STDOUT_DEBUG = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Boolean run() {
return Boolean.parseBoolean(
System.getProperty("org.jvnet.hk2.logger.debugToStdout", "false"));
}
});
private final java.util.logging.Logger jdkLogger;
private Logger() {
jdkLogger = java.util.logging.Logger.getLogger(HK2_LOGGER_NAME);
}
/**
* Gets the singleton instance of the Logger
* @return The singleton logger instance (will not return null)
*/
public static Logger getLogger() {
return INSTANCE;
}
/**
* Sends this message to the Debug channel (FINER level in JDK parlance)
*
* @param debuggingMessage The non-null message to log to the debug logger
*/
public void debug(String debuggingMessage) {
jdkLogger.finer(debuggingMessage);
if (STDOUT_DEBUG) {
System.out.println("HK2DEBUG: " + debuggingMessage);
}
}
/**
* Sends this message to the Debug channel (FINER level in JDK parlance)
*
* @param warningMessage The non-null message to log to the debug logger
*/
public void warning(String warningMessage) {
jdkLogger.warning(warningMessage);
if (STDOUT_DEBUG) {
System.out.println("HK2DEBUG (Warning): " + warningMessage);
}
}
/**
* Prints a throwable to stdout
*
* @param th The throwable to print
*/
public static void printThrowable(Throwable th) {
int lcv = 0;
Throwable cause = th;
while (cause != null) {
System.out.println("HK2DEBUG: Throwable[" + lcv++ + "] message is " + cause.getMessage());
cause.printStackTrace(System.out);
cause = cause.getCause();
}
}
/**
* Sends this message to the Debug channel (FINER level in JDK parlance)
*
* @param className The name of the class where this was thrown
* @param methodName The name of the method where this was thrown
* @param th The exception to log
*/
public void debug(String className, String methodName, Throwable th) {
jdkLogger.throwing(className, methodName, th);
if (STDOUT_DEBUG) {
System.out.println("HK2DEBUG: className=" + className + " methodName=" + methodName);
printThrowable(th);
}
}
}