me.j360.trace.server.brave.BootstrapTrace.java Source code

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Here is the source code for me.j360.trace.server.brave.BootstrapTrace.java

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/**
 * Copyright 2015-2016 The OpenZipkin 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 me.j360.trace.server.brave;

import me.j360.trace.collector.core.Brave;
import me.j360.trace.collector.core.LocalTracer;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationEvent;

import java.util.LinkedHashMap;
import java.util.Map;

/** This decouples bootstrap tracing from trace initialization. */
public enum BootstrapTrace {
    INSTANCE;

    private final Map<String, Long> annotations = new LinkedHashMap<>();
    private final long timestamp = System.currentTimeMillis() * 1000;
    private final long startTick = System.nanoTime();

    public void record(ApplicationEvent event) {
        annotations.put(event.getClass().getSimpleName().replace("Event", ""), timestamp + microsSinceInit());
        // record duration and flush the trace if we're done
        if (event instanceof ApplicationReadyEvent) {
            long duration = microsSinceInit(); // get duration now, as below logic might skew things.
            ApplicationReadyEvent ready = (ApplicationReadyEvent) event;
            try {
                LocalTracer tracer = ready.getApplicationContext().getBeanFactory().getBean(Brave.class)
                        .localTracer();

                tracer.startNewSpan("spring-boot", "bootstrap", timestamp);
                annotations.forEach(tracer::submitAnnotation);
                tracer.finishSpan(duration);
            } catch (NoSuchBeanDefinitionException ignored) {
                // Brave is optional
            }
        }
    }

    private long microsSinceInit() {
        return (System.nanoTime() - startTick) / 1000;
    }
}