Java tutorial
/* * Copyright 2013-2016 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 org.springframework.cloud.sleuth.instrument.zuul; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import org.apache.http.Header; import org.apache.http.client.methods.RequestBuilder; import org.springframework.cloud.sleuth.SpanTextMap; import org.springframework.cloud.sleuth.Tracer; /** * Customization of a Ribbon request for Apache HttpClient * * @author Marcin Grzejszczak * @since 1.1.0 */ class ApacheHttpClientRibbonRequestCustomizer extends SpanInjectingRibbonRequestCustomizer<RequestBuilder> { ApacheHttpClientRibbonRequestCustomizer(Tracer tracer) { super(tracer); } @Override public boolean accepts(Class aClass) { return aClass == RequestBuilder.class; } @Override protected SpanTextMap toSpanTextMap(final RequestBuilder context) { return new SpanTextMap() { @Override public Iterator<Map.Entry<String, String>> iterator() { Map<String, String> map = new HashMap<>(); for (Header header : context.build().getAllHeaders()) { map.put(header.getName(), header.getValue()); } return map.entrySet().iterator(); } @Override public void put(String key, String value) { context.addHeader(key, value); } }; } }