01 /*
02 * Java Genetic Algorithm Library (jenetics-3.5.0).
03 * Copyright (c) 2007-2016 Franz Wilhelmstötter
04 *
05 * Licensed under the Apache License, Version 2.0 (the "License");
06 * you may not use this file except in compliance with the License.
07 * You may obtain a copy of the License at
08 *
09 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 * Author:
18 * Franz Wilhelmstötter (franz.wilhelmstoetter@gmx.at)
19 */
20 package org.jenetics.internal.util;
21
22 import java.io.BufferedInputStream;
23 import java.io.Closeable;
24 import java.io.DataInputStream;
25 import java.io.FileInputStream;
26 import java.io.IOException;
27 import java.io.UncheckedIOException;
28
29 import org.jenetics.util.Random64;
30
31 /**
32 * @author <a href="mailto:franz.wilhelmstoetter@gmx.at">Franz Wilhelmstötter</a>
33 * @since 3.0
34 * @version 3.0
35 */
36 public class DevURandom extends Random64 implements Closeable {
37 private static final long serialVersionUID = 1L;
38
39 private final DataInputStream _input = input();
40
41 private static DataInputStream input() {
42 try {
43 return new DataInputStream(
44 new BufferedInputStream(
45 new FileInputStream("/dev/urandom")
46 )
47 );
48 } catch (IOException e) {
49 throw new UncheckedIOException(e);
50 }
51 }
52
53 @Override
54 public long nextLong() {
55 try {
56 return _input.readLong();
57 } catch (IOException e) {
58 throw new UncheckedIOException(e);
59 }
60 }
61
62 @Override
63 public void close() throws IOException {
64 _input.close();
65 }
66
67 }
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