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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  package org.apache.hc.core5.http.nio;
28  
29  import java.io.IOException;
30  
31  import org.apache.hc.core5.concurrent.FutureCallback;
32  import org.apache.hc.core5.http.EntityDetails;
33  import org.apache.hc.core5.http.HttpException;
34  import org.apache.hc.core5.http.HttpRequest;
35  import org.apache.hc.core5.http.protocol.HttpContext;
36  
37  /**
38   * Abstract asynchronous request consumer.
39   *
40   * @param <T> request representation.
41   *
42   * @since 5.0
43   */
44  public interface AsyncRequestConsumer<T> extends AsyncDataConsumer {
45  
46      /**
47       * Triggered to signal receipt of a request message head.
48       *
49       * @param request the request message head.
50       * @param entityDetails the request entity details or {@code null} if the request
51       *                      does not enclose an entity.
52       * @param context the actual execution context.
53       * @param resultCallback the result callback called when request processing
54       *                       has been completed successfully or unsuccessfully.
55       */
56      void consumeRequest(HttpRequest request, EntityDetails entityDetails, HttpContext context,
57                          FutureCallback<T> resultCallback) throws HttpException, IOException;
58  
59      /**
60       * Triggered to signal a failure in data processing.
61       *
62       * @param cause the cause of the failure.
63       */
64      void failed(Exception cause);
65  
66      /**
67       * Returns the result of request processing when it becomes available or {@code null}
68       * if the request is still being received.
69       *
70       * @return the request processing result.
71       */
72      T getResult();
73  
74  }