Examples with Random java.util.Random used on opensource projects

Example 76 with Random

use of java.util.Random in project hadoop by apache.

the class FoldedTreeSetTest method setUpClass.

@BeforeClass
public static void setUpClass() {
    long seed = System.nanoTime();
    System.out.println("This run uses the random seed " + seed);
    srand = new Random(seed);
}

Example 77 with Random

use of java.util.Random in project hadoop by apache.

the class TestBestEffortLongFile method testGetSet.

@Test
public void testGetSet() throws IOException {
    BestEffortLongFile f = new BestEffortLongFile(FILE, 12345L);
    try {
        // Before the file exists, should return default.
        assertEquals(12345L, f.get());
        // And first access should open it.
        assertTrue(FILE.exists());
        Random r = new Random();
        for (int i = 0; i < 100; i++) {
            long newVal = r.nextLong();
            // Changing the value should be reflected in the next get() call.
            f.set(newVal);
            assertEquals(newVal, f.get());
            // And should be reflected in a new instance (ie it actually got
            // written to the file)
            BestEffortLongFile f2 = new BestEffortLongFile(FILE, 999L);
            try {
                assertEquals(newVal, f2.get());
            } finally {
                IOUtils.closeStream(f2);
            }
        }
    } finally {
        IOUtils.closeStream(f);
    }
}

Example 78 with Random

use of java.util.Random in project hadoop by apache.

the class TestWebHdfsFileSystemContract method testSeek.

public void testSeek() throws IOException {
    final Path dir = new Path("/test/testSeek");
    assertTrue(fs.mkdirs(dir));
    {
        //test zero file size
        final Path zero = new Path(dir, "zero");
        fs.create(zero).close();
        int count = 0;
        final FSDataInputStream in = fs.open(zero);
        for (; in.read() != -1; count++) ;
        in.close();
        assertEquals(0, count);
    }
    final byte[] mydata = new byte[1 << 20];
    new Random().nextBytes(mydata);
    final Path p = new Path(dir, "file");
    FSDataOutputStream out = fs.create(p, false, 4096, (short) 3, 1L << 17);
    out.write(mydata, 0, mydata.length);
    out.close();
    final int one_third = mydata.length / 3;
    final int two_third = one_third * 2;
    {
        //test seek
        final int offset = one_third;
        final int len = mydata.length - offset;
        final byte[] buf = new byte[len];
        final FSDataInputStream in = fs.open(p);
        in.seek(offset);
        //read all remaining data
        in.readFully(buf);
        in.close();
        for (int i = 0; i < buf.length; i++) {
            assertEquals("Position " + i + ", offset=" + offset + ", length=" + len, mydata[i + offset], buf[i]);
        }
    }
    {
        //test position read (read the data after the two_third location)
        final int offset = two_third;
        final int len = mydata.length - offset;
        final byte[] buf = new byte[len];
        final FSDataInputStream in = fs.open(p);
        in.readFully(offset, buf);
        in.close();
        for (int i = 0; i < buf.length; i++) {
            assertEquals("Position " + i + ", offset=" + offset + ", length=" + len, mydata[i + offset], buf[i]);
        }
    }
}

Example 79 with Random

use of java.util.Random in project hadoop by apache.

the class TestChildReaper method testSomeNodes.

@Test
public void testSomeNodes() throws Exception {
    Timing timing = new Timing();
    ChildReaper reaper = null;
    CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
    try {
        client.start();
        Random r = new Random();
        int nonEmptyNodes = 0;
        for (int i = 0; i < 10; ++i) {
            client.create().creatingParentsIfNeeded().forPath("/test/" + Integer.toString(i));
            if (r.nextBoolean()) {
                client.create().forPath("/test/" + Integer.toString(i) + "/foo");
                ++nonEmptyNodes;
            }
        }
        reaper = new ChildReaper(client, "/test", Reaper.Mode.REAP_UNTIL_DELETE, 1);
        reaper.start();
        timing.forWaiting().sleepABit();
        Stat stat = client.checkExists().forPath("/test");
        Assert.assertEquals(stat.getNumChildren(), nonEmptyNodes);
    } finally {
        CloseableUtils.closeQuietly(reaper);
        CloseableUtils.closeQuietly(client);
    }
}

Example 80 with Random

use of java.util.Random in project hadoop by apache.

the class TestGSet method testComputeCapacity.

/** 
   * Test for {@link LightWeightGSet#computeCapacity(double, String)}
   */
@Test
public void testComputeCapacity() {
    // Tests for boundary conditions where percent or memory are zero
    testCapacity(0, 0.0);
    testCapacity(100, 0.0);
    testCapacity(0, 100.0);
    // Compute capacity for some 100 random max memory and percentage
    Random r = new Random();
    for (int i = 0; i < 100; i++) {
        long maxMemory = r.nextInt(Integer.MAX_VALUE);
        double percent = r.nextInt(101);
        testCapacity(maxMemory, percent);
    }
}