Example usage for java.util Random nextBytes

Introduction

In this page you can find the example usage for java.util Random nextBytes.

Prototype

public void nextBytes(byte[] bytes) 

Source Link

Document

Generates random bytes and places them into a user-supplied byte array.

Usage

From source file:org.apache.hadoop.hdfs.TestRaidDfs.java

public static long createTestFile(FileSystem fileSys, Path name, int repl, int numBlocks, long blocksize)
        throws IOException {
    CRC32 crc = new CRC32();
    Random rand = new Random();
    FSDataOutputStream stm = fileSys.create(name, true, fileSys.getConf().getInt("io.file.buffer.size", 4096),
            (short) repl, blocksize);
    // fill random data into file
    final byte[] b = new byte[(int) blocksize];
    for (int i = 0; i < numBlocks; i++) {
        rand.nextBytes(b);
        stm.write(b);//  www .  j  av a 2 s  .co m
        crc.update(b);
    }
    stm.close();
    return crc.getValue();
}

---

From source file:org.apache.wink.itest.standard.JAXRSDataSourceTest.java

/**
 * Tests posting to a DataSource entity parameter.
 * //from   w ww.  j av  a  2s.  c  o m
 * @throws HttpException
 * @throws IOException
 */
public void testPostDataSource() throws HttpException, IOException {
    HttpClient client = new HttpClient();

    PostMethod postMethod = new PostMethod(getBaseURI() + "/providers/standard/datasource");
    byte[] barr = new byte[1000];
    Random r = new Random();
    r.nextBytes(barr);
    postMethod.setRequestEntity(new InputStreamRequestEntity(new ByteArrayInputStream(barr), "text/plain"));
    postMethod.addRequestHeader("Accept", "text/plain");
    try {
        client.executeMethod(postMethod);

        assertEquals(200, postMethod.getStatusCode());
        InputStream is = postMethod.getResponseBodyAsStream();

        byte[] receivedBArr = new byte[1000];
        DataInputStream dis = new DataInputStream(is);
        dis.readFully(receivedBArr);

        int checkEOF = dis.read();
        assertEquals(-1, checkEOF);
        for (int c = 0; c < barr.length; ++c) {
            assertEquals(barr[c], receivedBArr[c]);
        }
        assertEquals("text/plain", postMethod.getResponseHeader("Content-Type").getValue());
        assertNull(
                (postMethod.getResponseHeader("Content-Length") == null) ? ""
                        : postMethod.getResponseHeader("Content-Length").getValue(),
                postMethod.getResponseHeader("Content-Length"));
    } finally {
        postMethod.releaseConnection();
    }
}

---

From source file:com.koda.integ.hbase.test.BlockCacheSimpleTest.java

/**
 * Gets the value./*  w  ww  . j a v  a 2  s .c  om*/
 *
 * @param size the size
 * @return the value
 */
private ByteArrayCacheable getValue(int size) {
    Random r = new Random(size);
    byte[] array = new byte[size];
    r.nextBytes(array);
    return new ByteArrayCacheable(array);
}

---

From source file:org.lealone.cluster.dht.ByteOrderedPartitioner.java

@Override
public BytesToken getRandomToken() {
    Random r = new Random();
    byte[] buffer = new byte[16];
    r.nextBytes(buffer);
    return new BytesToken(buffer);
}

---

From source file:be.tutul.naheulcraft.launcher.auth.Auth.java

private Cipher getCipher(int paramInt, String key) throws Exception {
    Random random = new Random(43287234L);
    byte[] salt = new byte[8];
    random.nextBytes(salt);
    PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 5);

    SecretKey pbeKey = SecretKeyFactory.getInstance("PBEWithMD5AndDES")
            .generateSecret(new PBEKeySpec(key.toCharArray()));
    Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
    cipher.init(paramInt, pbeKey, pbeParamSpec);

    return cipher;
}

---

From source file:org.apache.hadoop.dfs.DFSTestUtil.java

/** check if the files have been copied correctly. */
public boolean checkFiles(FileSystem fs, String topdir) throws IOException {

    //Configuration conf = new Configuration();
    Path root = new Path(topdir);

    for (int idx = 0; idx < nFiles; idx++) {
        Path fPath = new Path(root, files[idx].getName());
        FSDataInputStream in = fs.open(fPath);
        byte[] toRead = new byte[files[idx].getSize()];
        byte[] toCompare = new byte[files[idx].getSize()];
        Random rb = new Random(files[idx].getSeed());
        rb.nextBytes(toCompare);
        in.readFully(0, toRead);//from   ww  w  .  ja  v a 2s .co m
        in.close();
        for (int i = 0; i < toRead.length; i++) {
            if (toRead[i] != toCompare[i]) {
                return false;
            }
        }
        toRead = null;
        toCompare = null;
    }

    return true;
}

---

From source file:org.apache.wink.itest.standard.JAXRSDataSourceTest.java

/**
 * Tests receiving a DataSource with any media type.
 * /*  ww  w. ja  va2s.  co m*/
 * @throws HttpException
 * @throws IOException
 */
public void testWithRequestAcceptHeaderWillReturnRequestedContentType() throws HttpException, IOException {
    HttpClient client = new HttpClient();

    PutMethod putMethod = new PutMethod(getBaseURI() + "/providers/standard/datasource");
    byte[] barr = new byte[1000];
    Random r = new Random();
    r.nextBytes(barr);
    putMethod.setRequestEntity(new InputStreamRequestEntity(new ByteArrayInputStream(barr), "any/type"));
    try {
        client.executeMethod(putMethod);
        assertEquals(204, putMethod.getStatusCode());
    } finally {
        putMethod.releaseConnection();
    }

    GetMethod getMethod = new GetMethod(getBaseURI() + "/providers/standard/datasource");
    getMethod.addRequestHeader("Accept", "mytype/subtype");
    try {
        client.executeMethod(getMethod);
        assertEquals(200, getMethod.getStatusCode());
        InputStream is = getMethod.getResponseBodyAsStream();

        byte[] receivedBArr = new byte[1000];
        DataInputStream dis = new DataInputStream(is);
        dis.readFully(receivedBArr);

        int checkEOF = dis.read();
        assertEquals(-1, checkEOF);
        for (int c = 0; c < barr.length; ++c) {
            assertEquals(barr[c], receivedBArr[c]);
        }
        assertEquals("mytype/subtype", getMethod.getResponseHeader("Content-Type").getValue());
        assertNull(
                (getMethod.getResponseHeader("Content-Length") == null) ? ""
                        : getMethod.getResponseHeader("Content-Length").getValue(),
                getMethod.getResponseHeader("Content-Length"));
    } finally {
        getMethod.releaseConnection();
    }
}

---

From source file:org.apache.wink.itest.standard.JAXRSDataSourceTest.java

/**
 * Tests putting and then getting a DataSource entity.
 * //  ww  w .  j  a va  2 s.  co  m
 * @throws HttpException
 * @throws IOException
 */
public void testPutDataSource() throws HttpException, IOException {
    HttpClient client = new HttpClient();

    PutMethod putMethod = new PutMethod(getBaseURI() + "/providers/standard/datasource");
    byte[] barr = new byte[1000];
    Random r = new Random();
    r.nextBytes(barr);
    putMethod.setRequestEntity(new InputStreamRequestEntity(new ByteArrayInputStream(barr), "bytes/array"));
    try {
        client.executeMethod(putMethod);
        assertEquals(204, putMethod.getStatusCode());
    } finally {
        putMethod.releaseConnection();
    }

    GetMethod getMethod = new GetMethod(getBaseURI() + "/providers/standard/datasource");
    try {
        client.executeMethod(getMethod);
        assertEquals(200, getMethod.getStatusCode());
        InputStream is = getMethod.getResponseBodyAsStream();

        byte[] receivedBArr = new byte[1000];
        DataInputStream dis = new DataInputStream(is);
        dis.readFully(receivedBArr);

        int checkEOF = dis.read();
        assertEquals(-1, checkEOF);
        for (int c = 0; c < barr.length; ++c) {
            assertEquals(barr[c], receivedBArr[c]);
        }

        String contentType = (getMethod.getResponseHeader("Content-Type") == null) ? null
                : getMethod.getResponseHeader("Content-Type").getValue();
        assertNotNull(contentType, contentType);
        assertNull(
                (getMethod.getResponseHeader("Content-Length") == null) ? ""
                        : getMethod.getResponseHeader("Content-Length").getValue(),
                getMethod.getResponseHeader("Content-Length"));
    } finally {
        getMethod.releaseConnection();
    }
}

---

From source file:org.apache.flink.runtime.state.FileStateBackendTest.java

@Test
public void testStateOutputStream() throws IOException {
    File basePath = tempFolder.newFolder().getAbsoluteFile();

    try {/*from  w ww  .j a  v a  2  s  . com*/
        // the state backend has a very low in-mem state threshold (15 bytes)
        FsStateBackend backend = CommonTestUtils
                .createCopySerializable(new FsStateBackend(basePath.toURI(), 15));
        JobID jobId = new JobID();

        // we know how FsCheckpointStreamFactory is implemented so we know where it
        // will store checkpoints
        File checkpointPath = new File(basePath.getAbsolutePath(), jobId.toString());

        CheckpointStreamFactory streamFactory = backend.createStreamFactory(jobId, "test_op");

        byte[] state1 = new byte[1274673];
        byte[] state2 = new byte[1];
        byte[] state3 = new byte[0];
        byte[] state4 = new byte[177];

        Random rnd = new Random();
        rnd.nextBytes(state1);
        rnd.nextBytes(state2);
        rnd.nextBytes(state3);
        rnd.nextBytes(state4);

        long checkpointId = 97231523452L;

        CheckpointStreamFactory.CheckpointStateOutputStream stream1 = streamFactory
                .createCheckpointStateOutputStream(checkpointId, System.currentTimeMillis());

        CheckpointStreamFactory.CheckpointStateOutputStream stream2 = streamFactory
                .createCheckpointStateOutputStream(checkpointId, System.currentTimeMillis());

        CheckpointStreamFactory.CheckpointStateOutputStream stream3 = streamFactory
                .createCheckpointStateOutputStream(checkpointId, System.currentTimeMillis());

        stream1.write(state1);
        stream2.write(state2);
        stream3.write(state3);

        FileStateHandle handle1 = (FileStateHandle) stream1.closeAndGetHandle();
        ByteStreamStateHandle handle2 = (ByteStreamStateHandle) stream2.closeAndGetHandle();
        ByteStreamStateHandle handle3 = (ByteStreamStateHandle) stream3.closeAndGetHandle();

        // use with try-with-resources
        StreamStateHandle handle4;
        try (CheckpointStreamFactory.CheckpointStateOutputStream stream4 = streamFactory
                .createCheckpointStateOutputStream(checkpointId, System.currentTimeMillis())) {
            stream4.write(state4);
            handle4 = stream4.closeAndGetHandle();
        }

        // close before accessing handle
        CheckpointStreamFactory.CheckpointStateOutputStream stream5 = streamFactory
                .createCheckpointStateOutputStream(checkpointId, System.currentTimeMillis());
        stream5.write(state4);
        stream5.close();
        try {
            stream5.closeAndGetHandle();
            fail();
        } catch (IOException e) {
            // uh-huh
        }

        validateBytesInStream(handle1.openInputStream(), state1);
        handle1.discardState();
        assertFalse(isDirectoryEmpty(basePath));
        ensureLocalFileDeleted(handle1.getFilePath());

        validateBytesInStream(handle2.openInputStream(), state2);
        handle2.discardState();

        // nothing was written to the stream, so it will return nothing
        assertNull(handle3);

        validateBytesInStream(handle4.openInputStream(), state4);
        handle4.discardState();
        assertTrue(isDirectoryEmpty(checkpointPath));
    } catch (Exception e) {
        e.printStackTrace();
        fail(e.getMessage());
    }
}

---

From source file:org.aries.util.UUIDGeneratorFromJBoss.java

public final byte[] generateDummyAddress() {
    Random rnd = getRandomNumberGenerator();
    byte[] dummy = new byte[6];
    rnd.nextBytes(dummy);
    /* Need to set the broadcast bit to indicate it's not a real
     * address./*from   w  w  w.  j  a va 2  s  .  c  o  m*/
     */
    dummy[0] |= (byte) 0x01;

    if (UUIDGeneratorFromJBoss.log.isDebugEnabled()) {
        UUIDGeneratorFromJBoss.log.debug("using dummy address " + UUIDGeneratorFromJBoss.asString(dummy));
    }
    return dummy;
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• »