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OpenTracing integration for Microprofile

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/**
 * Copyright 2015-2018 Red Hat, Inc, and individual contributors.
 *
 * 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 org.wildfly.swarm.mpopentracing.deployment;

import io.opentracing.contrib.jaxrs2.server.SpanFinishingFilter;
import java.util.EnumSet;
import javax.servlet.DispatcherType;
import javax.servlet.FilterRegistration.Dynamic;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

/**
 * @author Pavol Loffay
 */
@WebListener
public class OpenTracingContextInitializer implements ServletContextListener {

  @Override
  public void contextInitialized(ServletContextEvent servletContextEvent) {
    ServletContext servletContext = servletContextEvent.getServletContext();
    Dynamic filterRegistration = servletContext
        .addFilter("tracingFilter", new SpanFinishingFilter());
    filterRegistration.setAsyncSupported(true);
    filterRegistration.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), false, "*");
  }

  @Override
  public void contextDestroyed(ServletContextEvent servletContextEvent) {
  }
}