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/*
* Copyright 2017, OpenCensus 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.opencensus.examples.trace;
import io.opencensus.exporter.trace.logging.LoggingExporter;
import io.opencensus.trace.Span;
import io.opencensus.trace.Tracer;
import io.opencensus.trace.Tracing;
/** Example showing how to directly create a child {@link Span} and add annotations. */
public final class MultiSpansTracing {
// Per class Tracer.
private static final Tracer tracer = Tracing.getTracer();
private MultiSpansTracing() {}
private static void doWork() {
Span rootSpan = tracer.spanBuilderWithExplicitParent("MyRootSpan", null).startSpan();
rootSpan.addAnnotation("Annotation to the root Span before child is created.");
Span childSpan = tracer.spanBuilderWithExplicitParent("MyChildSpan", rootSpan).startSpan();
childSpan.addAnnotation("Annotation to the child Span");
childSpan.end();
rootSpan.addAnnotation("Annotation to the root Span after child is ended.");
rootSpan.end();
}
/**
* Main method.
*
* @param args the main arguments.
*/
public static void main(String[] args) {
LoggingExporter.register();
doWork();
}
}
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