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App.java
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App.java
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/*
* Copyright (c) 2017, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.glassfish.jersey.examples.opentracing;
import java.io.IOException;
import java.net.URI;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpServerFactory;
import org.glassfish.jersey.opentracing.OpenTracingFeature;
import org.glassfish.jersey.opentracing.OpenTracingUtils;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.grizzly.http.server.HttpServer;
import com.uber.jaeger.Configuration;
import io.opentracing.Span;
import io.opentracing.util.GlobalTracer;
/**
* Open tracing example application.
* <p>
* Exposes OpenTracing-enabled REST application (with Jaeger registered as the Tracer)
* and invokes one request from (also OpenTracing-enabled) Jersey client.
* <p>
* To visualise the traces, start Jaeger locally:
* <pre>
* docker run -d -p 5775:5775/udp -p 16686:16686 jaegertracing/all-in-one:travis-1278
* </pre>
* and go to {@code localhost:16686}.
*
* @author Adam Lindenthal
* @since 2.26
*/
public class App {
private static final URI BASE_URI = URI.create("http://localhost:8080/opentracing");
public static void main(String[] args) {
try {
System.out.println("\"Hello World\" Jersey OpenTracing Example App");
prepare();
final ResourceConfig resourceConfig = new ResourceConfig(TracedResource.class,
OpenTracingFeature.class,
ReqFilterA.class, ReqFilterB.class,
RespFilterA.class, RespFilterB.class);
final HttpServer server = GrizzlyHttpServerFactory.createHttpServer(BASE_URI, resourceConfig, false);
Runtime.getRuntime().addShutdownHook(new Thread(server::shutdownNow));
server.start();
System.out.println(String.format("Application started.\nTry out %s/application.wadl\n"
+ "Stop the application using CTRL+C", BASE_URI));
// do the first "example" request with tracing-enabled client to show something in Jaegger UI,
// include some weird headers and accepted types, that will be visible in the span's tags
Client client = ClientBuilder.newBuilder().register(OpenTracingFeature.class).build();
client.target(BASE_URI).path("resource/managedClient").request()
.accept("text/plain", "application/json", "*/*")
.header("foo", "bar")
.header("foo", "baz")
.header("Hello", "World").get();
Thread.currentThread().join();
} catch (IOException | InterruptedException ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* Configures Jaeger tracer as the {@link GlobalTracer}.
*/
private static void prepare() {
GlobalTracer.register(
new com.uber.jaeger.Configuration(
"OpenTracingTemporaryTest",
new Configuration.SamplerConfiguration("const", 1),
new Configuration.ReporterConfiguration(
true,
"localhost",
5775,
1000,
10000)
).getTracer()
);
}
/**
* No-op request filter, just to test, that it will be listed in the root level span's logs.
* For demonstrating purposes, it resolves the "root" request span and logs into it. If it fails to resolve the span, it
* creates a new ad-hoc span.
*/
static class ReqFilterA implements ContainerRequestFilter {
@Override
public void filter(ContainerRequestContext requestContext) throws IOException {
Span span = OpenTracingUtils
.getRequestSpan(requestContext)
.orElse(GlobalTracer.get().buildSpan("ad-hoc-span-reqA").startManual());
span.log("ReqFilterA.filter() invoked");
}
}
/**
* No-op request filter, just to test, that it will be listed in the root level span's logs.
* For demonstrating purposes, it resolves the "root" request span and logs into it. If it fails to resolve the span, it
* creates a new ad-hoc span.
*/
static class ReqFilterB implements ContainerRequestFilter {
@Override
public void filter(ContainerRequestContext requestContext) throws IOException {
Span span = OpenTracingUtils
.getRequestSpan(requestContext)
.orElse(GlobalTracer.get().buildSpan("ad-hoc-span-reqB").startManual());
span.log("ReqFilterB.filter() invoked");
}
}
/**
* No-op response filter, just to test, that it will be listed in the root level span's logs.
*/
static class RespFilterA implements ContainerResponseFilter {
@Override
public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
Span span = OpenTracingUtils
.getRequestSpan(requestContext)
.orElse(GlobalTracer.get().buildSpan("ad-hoc-span-respA").startManual());
span.log("RespFilterA.filter() invoked");
}
}
/**
* No-op response filter, just to test, that it will be listed in the root level span's logs.
*/
static class RespFilterB implements ContainerResponseFilter {
@Override
public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
Span span = OpenTracingUtils
.getRequestSpan(requestContext)
.orElse(GlobalTracer.get().buildSpan("ad-hoc-span-respB").startManual());
span.log("RespFilterB.filter() invoked");
}
}
}