com.yoho.core.trace.DefaultSpanNamer.java Source code

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Here is the source code for com.yoho.core.trace.DefaultSpanNamer.java

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/*
 * Copyright 2013-2016 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
 *
 *      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.yoho.core.trace;

import org.springframework.core.annotation.AnnotationUtils;

/**
 * Default implementation of SpanNamer that tries to get the span name as follows:
 *
 *  <li>
 *     <ul>from the @SpanName annotation if one is present</ul>
 *     <ul>from the toString() of the delegate if it's not the
 *     default {@link Object#toString()}</ul>
 *     <ul>the default provided value</ul>
 * </li>
 *
 * @author Marcin Grzejszczak
 * @since 1.0.0
 *
 * @see SpanName
 */
public class DefaultSpanNamer implements SpanNamer {

    @Override
    public String name(Object object, String defaultValue) {
        SpanName annotation = AnnotationUtils.findAnnotation(object.getClass(), SpanName.class);
        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 static boolean isDefaultToString(Object delegate, String spanName) {
        return (delegate.getClass().getName() + "@" + Integer.toHexString(delegate.hashCode())).equals(spanName);
    }
}