content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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 io.activej.http;
  
  import io.activej.promise.Promise;
  
  import java.util.concurrent.Executor;
  
  /**
   * An interface for a servlet function that asynchronously receives a {@link HttpRequest},
   * processes it and then returns a {@link HttpResponse}.
   */
  @FunctionalInterface
  public interface AsyncServlet {
  	Promise<HttpResponse> serve(HttpRequest request) throws Exception;
  
  	/**
  	 * Wraps given {@link BlockingServlet} into async one using given {@link Executor}.
  	 */
  	static AsyncServlet ofBlocking(Executor executor, BlockingServlet blockingServlet) {
  		return request -> request.loadBody()
  			.then(() -> Promise.ofBlocking(executor,
  				() -> blockingServlet.serve(request)));
  	}
  }
  