Here you can find the source of wrapWithMDC(Runnable r)
public static Runnable wrapWithMDC(Runnable r)
//package com.java2s;
/**/*from w w w. j a v a 2 s. c om*/
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.
*/
import org.slf4j.MDC;
import java.util.Map;
public class Main {
public static Runnable wrapWithMDC(Runnable r) {
Map<String, String> mdc = MDC.getCopyOfContextMap();
return () -> {
Map<String, String> oldMdc = MDC.getCopyOfContextMap();
if (mdc == null) {
MDC.clear();
} else {
MDC.setContextMap(mdc);
}
try {
r.run();
} finally {
if (oldMdc == null) {
MDC.clear();
} else {
MDC.setContextMap(oldMdc);
}
}
};
}
}