/**
* 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;
import java.util.concurrent.Callable;
import org.apache.cxf.tracing.Traceable;
import org.apache.cxf.tracing.TracerContext;
import org.apache.htrace.core.Span;
import org.apache.htrace.core.TraceScope;
import org.apache.htrace.core.Tracer;
public class HTraceTracerContext implements TracerContext {
private final Tracer tracer;
private final TraceScope continuationScope;
public HTraceTracerContext(final Tracer tracer) {
this(tracer, null);
}
public HTraceTracerContext(final Tracer tracer, final TraceScope continuationScope) {
this.tracer = tracer;
this.continuationScope = continuationScope;
}
@Override
@SuppressWarnings("unchecked")
public TraceScope startSpan(final String description) {
return tracer.newScope(description);
}
@Override
public <T> T continueSpan(final Traceable<T> traceable) throws Exception {
boolean attached = false;
if (!isTracing() && continuationScope != null) {
continuationScope.reattach();
attached = true;
}
try {
return traceable.call(new HTraceTracerContext(tracer));
} finally {
if (continuationScope != null && attached) {
continuationScope.detach();
}
}
}
@Override
public <T> Callable<T> wrap(final String description, final Traceable<T> traceable) {
final Callable<T> callable = new Callable<T>() {
@Override
public T call() throws Exception {
return traceable.call(new HTraceTracerContext(tracer));
}
};
return tracer.wrap(callable, description);
}
@Override
public void annotate(String key, String value) {
final Span currentSpan = Tracer.getCurrentSpan();
if (currentSpan != null) {
currentSpan.addKVAnnotation(key, value);
}
}
@Override
public void timeline(String message) {
final Span currentSpan = Tracer.getCurrentSpan();
if (currentSpan != null) {
currentSpan.addTimelineAnnotation(message);
}
}
private boolean isTracing() {
return Tracer.getCurrentSpan() != null;
}
}