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MessageListenerMethodInterceptor.java
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MessageListenerMethodInterceptor.java
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/*
* Copyright 2017-2020 The OpenTracing Authors
*
* 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 io.opentracing.contrib.kafka.spring;
import io.opentracing.*;
import io.opentracing.contrib.kafka.TracingKafkaUtils;
import io.opentracing.tag.Tags;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.kafka.clients.consumer.ConsumerRecord;
class MessageListenerMethodInterceptor implements MethodInterceptor {
private static final String SPAN_PREFIX = "KafkaListener_";
private final Tracer tracer;
MessageListenerMethodInterceptor(Tracer tracer) {
this.tracer = tracer;
}
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
if (!"onMessage".equals(invocation.getMethod().getName())) {
return invocation.proceed();
}
Object[] arguments = invocation.getArguments();
ConsumerRecord<?, ?> record = getConsumerRecord(arguments);
if (record == null) {
return invocation.proceed();
}
Tracer.SpanBuilder spanBuilder = tracer.buildSpan(SPAN_PREFIX + record.topic())
.withTag(Tags.SPAN_KIND.getKey(), Tags.SPAN_KIND_CONSUMER);
SpanContext parentContext = TracingKafkaUtils.extractSpanContext(record.headers(), tracer);
if (parentContext != null) {
spanBuilder.addReference(References.FOLLOWS_FROM, parentContext);
}
Span span = spanBuilder.start();
try (Scope ignored = tracer.activateSpan(span)) {
return invocation.proceed();
} catch (Exception e) {
Tags.ERROR.set(span, Boolean.TRUE);
throw e;
} finally {
span.finish();
}
}
private ConsumerRecord<?, ?> getConsumerRecord(Object[] arguments) {
for (Object object : arguments) {
if (object instanceof ConsumerRecord) {
return (ConsumerRecord<?, ?>) object;
}
}
return null;
}
}