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.client5.http.impl.cache;
28
29 import java.util.concurrent.atomic.AtomicReference;
30
31 import org.apache.hc.client5.http.cache.Resource;
32 import org.apache.hc.client5.http.cache.ResourceIOException;
33 import org.apache.hc.core5.annotation.Contract;
34 import org.apache.hc.core5.annotation.ThreadingBehavior;
35
36 /**
37 * Cache resource backed by a byte array on the heap.
38 *
39 * @since 4.1
40 */
41 @Contract(threading = ThreadingBehavior.IMMUTABLE)
42 public class HeapResource extends Resource {
43
44 private static final long serialVersionUID = -2078599905620463394L;
45
46 private final AtomicReference<byte[]> arrayRef;
47
48 public HeapResource(final byte[] b) {
49 super();
50 this.arrayRef = new AtomicReference<>(b);
51 }
52
53 @Override
54 public byte[] get() throws ResourceIOException {
55 final byte[] byteArray = this.arrayRef.get();
56 if (byteArray != null) {
57 return byteArray;
58 }
59 throw new ResourceIOException("Resource already disposed");
60 }
61
62 @Override
63 public long length() {
64 final byte[] byteArray = this.arrayRef.get();
65 return byteArray != null ? byteArray.length : -1;
66 }
67
68 @Override
69 public void dispose() {
70 this.arrayRef.set(null);
71 }
72
73 @Override
74 public String toString() {
75 return "[" +
76 "heap," +
77 "len=" + length() +
78 ']';
79 }
80
81 }