io.micrometer.tracing.internal.DefaultSpanNamer Maven / Gradle / Ivy
/**
* Copyright 2022 the original author or 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
*
* https://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.micrometer.tracing.internal;
import java.lang.reflect.Method;
import io.micrometer.tracing.SpanName;
import io.micrometer.tracing.SpanNamer;
/**
* Default implementation of SpanNamer that tries to get the span name as follows:
*
* * from the @SpanName annotation on the class if one is present.
*
* * from the @SpanName annotation on the method if passed object is of a {@link Method}.
* type
*
* * from the toString() of the delegate if it's not the default
* {@link Object#toString()}.
*
* * the default provided value.
*
* @author Marcin Grzejszczak
* @see SpanName
* @since 1.0.0
*/
public class DefaultSpanNamer implements SpanNamer {
private static boolean isDefaultToString(Object delegate, String spanName) {
if (delegate instanceof Method) {
return delegate.toString().equals(spanName);
}
return (delegate.getClass().getName() + "@" + Integer.toHexString(delegate.hashCode())).equals(spanName);
}
@Override
public String name(Object object, String defaultValue) {
SpanName annotation = annotation(object);
String spanName = annotation != null ? annotation.value() : object.toString();
// If there is no overridden toString method we'll put a constant value
if (isDefaultToString(object, spanName)) {
return defaultValue;
}
return spanName;
}
private SpanName annotation(Object o) {
if (o instanceof Method) {
return ((Method) o).getAnnotation(SpanName.class);
}
return o.getClass().getAnnotation(SpanName.class);
}
}