hadoop Tracer 源码
haddop Tracer 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/tracing/Tracer.java
/**
* 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.hadoop.tracing;
/**
* No-Op Tracer (for now) to remove HTrace without changing too many files.
*/
public class Tracer {
// Singleton
private static final Tracer globalTracer = null;
private final NullTraceScope nullTraceScope;
private final String name;
public final static String SPAN_RECEIVER_CLASSES_KEY =
"span.receiver.classes";
public Tracer(String name) {
this.name = name;
nullTraceScope = NullTraceScope.INSTANCE;
}
// Keeping this function at the moment for HTrace compatiblity,
// in fact all threads share a single global tracer for OpenTracing.
public static Tracer curThreadTracer() {
return globalTracer;
}
/***
* Return active span.
* @return org.apache.hadoop.tracing.Span
*/
public static Span getCurrentSpan() {
return null;
}
public TraceScope newScope(String description) {
return nullTraceScope;
}
public Span newSpan(String description, SpanContext spanCtx) {
return new Span();
}
public TraceScope newScope(String description, SpanContext spanCtx) {
return nullTraceScope;
}
public TraceScope newScope(String description, SpanContext spanCtx,
boolean finishSpanOnClose) {
return nullTraceScope;
}
public TraceScope activateSpan(Span span) {
return nullTraceScope;
}
public void close() {
}
public String getName() {
return name;
}
public static class Builder {
static Tracer globalTracer;
private String name;
public Builder(final String name) {
this.name = name;
}
public Builder conf(TraceConfiguration conf) {
return this;
}
public Tracer build() {
if (globalTracer == null) {
globalTracer = new Tracer(name);
}
return globalTracer;
}
}
}
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