/**
* 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.
*/
package org.apache.cxf.tracing.htrace.ext;
import org.apache.htrace.core.Span;
import org.apache.htrace.core.Tracer;
import ch.qos.logback.classic.pattern.ClassicConverter;
import ch.qos.logback.classic.spi.ILoggingEvent;
/**
* Logback conversion rule implementation to enrich log records with tracing details like spanId and tracerId.
* For example, here is sample logback.xml configuration snippet:
*
* <conversionRule conversionWord="trace" converterClass="org.apache.cxf.tracing.htrace.ext.LogbackSpanConverter" />
*
* <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
* <encoder>
* <pattern>[%level] [%trace] %d{yyyy-MM-dd HH:mm:ss.SSS} %logger{36} %msg%n</pattern>
* </encoder>
* </appender>
*
* Which produces the following sample output:
*
* [INFO] [-, -] 2017-03-11 14:40:13.603 org.eclipse.jetty.server.Server Started @2731ms
* [INFO] [tracer-server/192.168.0.101, span: 6d3e0d975d4c883cce12aee1fd8f3e7e] 2017-03-11 14:40:24.013
* com.example.rs.PeopleRestService Getting all employees
* [INFO] [tracer-server/192.168.0.101, span: 6d3e0d975d4c883c7592f4c2317dec22] 2017-03-11 14:40:28.017
* com.example.rs.PeopleRestService Looking up manager in the DB database
*
*/
public class LogbackSpanConverter extends ClassicConverter {
private static final String SPAN = "span";
private static final String EMPTY_TRACE = "-, -";
@Override
public String convert(ILoggingEvent event) {
final Span currentSpan = Tracer.getCurrentSpan();
if (currentSpan != null) {
return new StringBuilder()
.append(currentSpan.getTracerId())
.append(", ")
.append(SPAN)
.append(": ")
.append(currentSpan.getSpanId())
.toString();
}
return EMPTY_TRACE;
}
}