co.elastic.apm.agent.sdk.logging.LoggerFactory Maven / Gradle / Ivy
/*
* Licensed to Elasticsearch B.V. under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch B.V. licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package co.elastic.apm.agent.sdk.logging;
import javax.annotation.Nullable;
import java.security.AccessController;
import java.security.PrivilegedAction;
public class LoggerFactory {
private static volatile ILoggerFactory iLoggerFactory;
public static void initialize(ILoggerFactory iLoggerFactory) {
LoggerFactory.iLoggerFactory = iLoggerFactory;
}
/**
* Return a logger named according to the name parameter.
*
* A lazy-initialization logger implementation will be returned when this method is called before {@link #initialize(ILoggerFactory)}
*
*
* @param name The name of the logger.
* @return logger
*/
public static Logger getLogger(String name) {
Logger logger = getLoggerFromFactory(name);
return logger != null ? logger : new LazyInitLogger(name);
}
/**
* Return a logger named corresponding to the class passed as parameter.
*
* @param clazz the returned logger will be named after clazz
* @return logger
*/
public static Logger getLogger(Class clazz) {
return getLogger(clazz.getName());
}
@Nullable
private static Logger getLoggerFromFactory(final String name) {
if (iLoggerFactory == null) {
return null;
}
Logger logger;
if (System.getSecurityManager() == null) {
logger = iLoggerFactory.getLogger(name);
} else {
logger = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Logger run() {
return iLoggerFactory.getLogger(name);
}
});
}
// in case the factory is unable to provide a logger, we return Noop impl to prevent further calls to the factory
return logger != null ? logger : NoopLogger.INSTANCE;
}
/**
* Lazy-initialization logger when the {@link #initialize(ILoggerFactory)} method hasn't been called yet. Allows to
* make calls to {@link #getLogger} before {@link #initialize} to have a valid logger.
*/
// package-private for testing
static class LazyInitLogger implements Logger {
private final String name;
private volatile Logger delegate = null;
LazyInitLogger(String name) {
this.name = name;
}
@Override
public String getName() {
return name;
}
// package-private for testing
Logger getDelegate() {
if (delegate != null) {
return delegate;
}
delegate = getLoggerFromFactory(name);
return delegate != null ? delegate : NoopLogger.INSTANCE;
}
@Override
public boolean isTraceEnabled() {
return getDelegate().isTraceEnabled();
}
@Override
public void trace(String msg) {
getDelegate().trace(msg);
}
@Override
public void trace(String format, Object arg) {
getDelegate().trace(format, arg);
}
@Override
public void trace(String format, Object arg1, Object arg2) {
getDelegate().trace(format, arg1, arg2);
}
@Override
public void trace(String format, Object... arguments) {
getDelegate().trace(format, arguments);
}
@Override
public void trace(String msg, Throwable t) {
getDelegate().trace(msg, t);
}
@Override
public boolean isDebugEnabled() {
return getDelegate().isDebugEnabled();
}
@Override
public void debug(String msg) {
getDelegate().debug(msg);
}
@Override
public void debug(String format, Object arg) {
getDelegate().debug(format, arg);
}
@Override
public void debug(String format, Object arg1, Object arg2) {
getDelegate().debug(format, arg1, arg2);
}
@Override
public void debug(String format, Object... arguments) {
getDelegate().debug(format, arguments);
}
@Override
public void debug(String msg, Throwable t) {
getDelegate().debug(msg, t);
}
@Override
public boolean isInfoEnabled() {
return getDelegate().isInfoEnabled();
}
@Override
public void info(String msg) {
getDelegate().info(msg);
}
@Override
public void info(String format, Object arg) {
getDelegate().info(format, arg);
}
@Override
public void info(String format, Object arg1, Object arg2) {
getDelegate().info(format, arg1, arg2);
}
@Override
public void info(String format, Object... arguments) {
getDelegate().info(format, arguments);
}
@Override
public void info(String msg, Throwable t) {
getDelegate().info(msg, t);
}
@Override
public boolean isWarnEnabled() {
return getDelegate().isWarnEnabled();
}
@Override
public void warn(String msg) {
getDelegate().warn(msg);
}
@Override
public void warn(String format, Object arg) {
getDelegate().warn(format, arg);
}
@Override
public void warn(String format, Object... arguments) {
getDelegate().warn(format, arguments);
}
@Override
public void warn(String format, Object arg1, Object arg2) {
getDelegate().warn(format, arg1, arg2);
}
@Override
public void warn(String msg, Throwable t) {
getDelegate().warn(msg, t);
}
@Override
public boolean isErrorEnabled() {
return getDelegate().isErrorEnabled();
}
@Override
public void error(String msg) {
getDelegate().error(msg);
}
@Override
public void error(String format, Object arg) {
getDelegate().error(format, arg);
}
@Override
public void error(String format, Object arg1, Object arg2) {
getDelegate().error(format, arg1, arg2);
}
@Override
public void error(String format, Object... arguments) {
getDelegate().error(format, arguments);
}
@Override
public void error(String msg, Throwable t) {
getDelegate().error(msg, t);
}
}
// package-private for testing
static class NoopLogger implements Logger {
static final NoopLogger INSTANCE = new NoopLogger();
private NoopLogger() {
}
@Override
public String getName() {
return "null";
}
@Override
public boolean isTraceEnabled() {
return false;
}
@Override
public void trace(String msg) {
}
@Override
public void trace(String format, Object arg) {
}
@Override
public void trace(String format, Object arg1, Object arg2) {
}
@Override
public void trace(String format, Object... arguments) {
}
@Override
public void trace(String msg, Throwable t) {
}
@Override
public boolean isDebugEnabled() {
return false;
}
@Override
public void debug(String msg) {
}
@Override
public void debug(String format, Object arg) {
}
@Override
public void debug(String format, Object arg1, Object arg2) {
}
@Override
public void debug(String format, Object... arguments) {
}
@Override
public void debug(String msg, Throwable t) {
}
@Override
public boolean isInfoEnabled() {
return false;
}
@Override
public void info(String msg) {
}
@Override
public void info(String format, Object arg) {
}
@Override
public void info(String format, Object arg1, Object arg2) {
}
@Override
public void info(String format, Object... arguments) {
}
@Override
public void info(String msg, Throwable t) {
}
@Override
public boolean isWarnEnabled() {
return false;
}
@Override
public void warn(String msg) {
}
@Override
public void warn(String format, Object arg) {
}
@Override
public void warn(String format, Object... arguments) {
}
@Override
public void warn(String format, Object arg1, Object arg2) {
}
@Override
public void warn(String msg, Throwable t) {
}
@Override
public boolean isErrorEnabled() {
return false;
}
@Override
public void error(String msg) {
}
@Override
public void error(String format, Object arg) {
}
@Override
public void error(String format, Object arg1, Object arg2) {
}
@Override
public void error(String format, Object... arguments) {
}
@Override
public void error(String msg, Throwable t) {
}
}
}