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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.entity;
28  
29  import java.io.IOException;
30  import java.io.UnsupportedEncodingException;
31  import java.nio.charset.UnsupportedCharsetException;
32  
33  import org.apache.hc.core5.concurrent.FutureCallback;
34  import org.apache.hc.core5.http.ContentType;
35  import org.apache.hc.core5.http.EntityDetails;
36  import org.apache.hc.core5.http.HttpException;
37  import org.apache.hc.core5.http.nio.AsyncEntityConsumer;
38  import org.apache.hc.core5.util.Args;
39  
40  public abstract class AbstractBinAsyncEntityConsumer<T> extends AbstractBinDataConsumer implements AsyncEntityConsumer<T> {
41  
42      private volatile FutureCallback<T> resultCallback;
43      private volatile T content;
44  
45      protected abstract void streamStart(ContentType contentType) throws HttpException, IOException;
46  
47      protected abstract T generateContent() throws IOException;
48  
49      @Override
50      public final void streamStart(
51              final EntityDetails entityDetails,
52              final FutureCallback<T> resultCallback) throws IOException, HttpException {
53          Args.notNull(resultCallback, "Result callback");
54          this.resultCallback = resultCallback;
55          try {
56              final ContentType contentType = entityDetails != null ? ContentType.parse(entityDetails.getContentType()) : null;
57              streamStart(contentType);
58          } catch (final UnsupportedCharsetException ex) {
59              throw new UnsupportedEncodingException(ex.getMessage());
60          }
61      }
62  
63      @Override
64      protected final void completed() throws IOException {
65          content = generateContent();
66          if (resultCallback != null) {
67              resultCallback.completed(content);
68          }
69          releaseResources();
70      }
71  
72      @Override
73      public final void failed(final Exception cause) {
74          if (resultCallback != null) {
75              resultCallback.failed(cause);
76          }
77          releaseResources();
78      }
79  
80      @Override
81      public final T getContent() {
82          return content;
83      }
84  
85  }