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Zipkin support for Ratpack

There is a newer version: 2.3.1

/*
 * Copyright 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 ratpack.zipkin;

import com.github.kristofa.brave.KeyValueAnnotation;
import java.util.Arrays;
import ratpack.http.Request;

import java.util.Collection;
import java.util.Collections;
import zipkin.TraceKeys;

@FunctionalInterface
public interface RequestAnnotationExtractor {
  Collection annotationsForRequest(Request request);

  RequestAnnotationExtractor DEFAULT = (request -> Arrays.asList(
      KeyValueAnnotation.create(TraceKeys.HTTP_PATH, request.getPath()),
      KeyValueAnnotation.create(TraceKeys.HTTP_METHOD, request.getMethod().toString())
  ));

}