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TraceLoggingEnhancer.java
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TraceLoggingEnhancer.java
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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* Licensed 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 com.google.cloud.logging;
/* Adds tracing support for logging with thread-local trace ID tracking. */
public class TraceLoggingEnhancer implements LoggingEnhancer {
private final static String TRACE_ID = "trace_id";
private final String traceIdLabel;
public TraceLoggingEnhancer() {
traceIdLabel = TRACE_ID;
}
public TraceLoggingEnhancer(String prefix) {
traceIdLabel = (prefix != null) ? prefix + TRACE_ID : TRACE_ID;
}
private static final ThreadLocal<String> traceId = new ThreadLocal<>();
/**
* Set the Trace ID associated with any logging done by the current thread.
*
* @param id The traceID
*/
public static void setCurrentTraceId(String id) {
traceId.set(id);
}
/**
* Get the Trace ID associated with any logging done by the current thread.
*
* @return id The traceID
*/
public static String getCurrentTraceId() {
return traceId.get();
}
@Override
public void enhanceLogEntry(com.google.cloud.logging.LogEntry.Builder builder) {
String traceId = getCurrentTraceId();
if (traceId != null) {
builder.addLabel(traceIdLabel, traceId);
}
}
}