io.netty.util.internal.logging.Slf4JLoggerFactory Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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 io.netty.util.internal.logging;
import org.slf4j.LoggerFactory;
import org.slf4j.helpers.NOPLoggerFactory;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
/**
* Logger factory which creates a SLF4J
* logger.
*/
public class Slf4JLoggerFactory extends InternalLoggerFactory {
public Slf4JLoggerFactory() {
}
Slf4JLoggerFactory(boolean failIfNOP) {
assert failIfNOP; // Should be always called with true.
// SFL4J writes it error messages to System.err. Capture them so that the user does not see such a message on
// the console during automatic detection.
final StringBuffer buf = new StringBuffer();
final PrintStream err = System.err;
try {
System.setErr(new PrintStream(new OutputStream() {
@Override
public void write(int b) {
buf.append((char) b);
}
}, true, "US-ASCII"));
} catch (UnsupportedEncodingException e) {
throw new Error(e);
}
try {
if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
throw new NoClassDefFoundError(buf.toString());
} else {
err.print(buf);
err.flush();
}
} finally {
System.setErr(err);
}
}
@Override
public InternalLogger newInstance(String name) {
return new Slf4JLogger(LoggerFactory.getLogger(name));
}
}