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    * Licensed to the Apache Software Foundation (ASF) under one
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    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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,
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   * "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.
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   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
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  package org.apache.hc.client5.testing.extension.async;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.hc.client5.testing.SSLTestContexts;
  import org.apache.hc.core5.function.Decorator;
  import org.apache.hc.core5.function.Supplier;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.http.nio.AsyncServerExchangeHandler;
  import org.apache.hc.core5.http.nio.AsyncServerRequestHandler;
  import org.apache.hc.core5.http.nio.support.BasicServerExchangeHandler;
  import org.apache.hc.core5.http.protocol.HttpProcessor;
  import org.apache.hc.core5.http2.config.H2Config;
  import org.apache.hc.core5.reactor.IOReactorConfig;
  import org.apache.hc.core5.testing.nio.H2TestServer;
  import org.apache.hc.core5.util.Args;
  import org.apache.hc.core5.util.Timeout;
  
  public class TestAsyncServerBootstrap {
  
      static final class HandlerEntry<T> {
  
          final String hostname;
          final String uriPattern;
          final T handler;
  
          public HandlerEntry(final String hostname, final String uriPattern, final T handler) {
              this.hostname = hostname;
              this.uriPattern = uriPattern;
              this.handler = handler;
          }
  
          public HandlerEntry(final String uriPattern, final T handler) {
              this(null, uriPattern, handler);
          }
  
      }
  
      private final URIScheme scheme;
      private final ServerProtocolLevel serverProtocolLevel;
  
      private final List<HandlerEntry<Supplier<AsyncServerExchangeHandler>>> handlerList;
      private Timeout timeout;
      private HttpProcessor httpProcessor;
      private Decorator<AsyncServerExchangeHandler> exchangeHandlerDecorator;
  
      public TestAsyncServerBootstrap(final URIScheme scheme, final ServerProtocolLevel serverProtocolLevel) {
          this.scheme = scheme != null ? scheme : URIScheme.HTTP;
          this.serverProtocolLevel = serverProtocolLevel != null ? serverProtocolLevel : ServerProtocolLevel.STANDARD;
          this.handlerList = new ArrayList<>();
      }
  
      public ServerProtocolLevel getProtocolLevel() {
          return serverProtocolLevel;
      }
  
      public TestAsyncServerBootstrap register(final String uriPattern, final Supplier<AsyncServerExchangeHandler> supplier) {
          Args.notNull(uriPattern, "URI pattern");
          Args.notNull(supplier, "Exchange handler supplier");
          handlerList.add(new HandlerEntry<>(uriPattern, supplier));
          return this;
      }
  
      public TestAsyncServerBootstrap register(
              final String uriPattern,
              final AsyncServerRequestHandler<AsyncServerExchangeHandler> requestHandler) {
          return register(uriPattern, () -> new BasicServerExchangeHandler<>(requestHandler));
      }
  
      public TestAsyncServerBootstrap setTimeout(final Timeout timeout) {
         this.timeout = timeout;
         return this;
     }
 
     public TestAsyncServerBootstrap setHttpProcessor(final HttpProcessor httpProcessor) {
         this.httpProcessor = httpProcessor;
         return this;
     }
 
     public TestAsyncServerBootstrap setExchangeHandlerDecorator(final Decorator<AsyncServerExchangeHandler> exchangeHandlerDecorator) {
         this.exchangeHandlerDecorator = exchangeHandlerDecorator;
         return this;
     }
 
     public TestAsyncServer build() throws Exception {
         final H2TestServer server = new H2TestServer(
                 IOReactorConfig.custom()
                         .setSoTimeout(timeout)
                         .build(),
                 scheme == URIScheme.HTTPS ? SSLTestContexts.createServerSSLContext() : null,
                 null,
                 null);
         for (final HandlerEntry<Supplier<AsyncServerExchangeHandler>> entry: handlerList) {
             server.register(entry.uriPattern, entry.handler);
         }
         return new TestAsyncServer(
                 server,
                 serverProtocolLevel == ServerProtocolLevel.H2_ONLY ? H2Config.DEFAULT : null,
                 serverProtocolLevel == ServerProtocolLevel.STANDARD ? Http1Config.DEFAULT : null,
                 httpProcessor,
                 exchangeHandlerDecorator);
     }
 
 }