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

Example 21 with Random

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

the class PagedViewsTest method testReadFully.

@Test
public void testReadFully() {
    int bufferSize = 100;
    byte[] expected = new byte[bufferSize];
    new Random().nextBytes(expected);
    TestOutputView outputView = new TestOutputView(bufferSize);
    try {
        outputView.write(expected);
    } catch (Exception e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not write to TestOutputView.");
    }
    outputView.close();
    TestInputView inputView = new TestInputView(outputView.segments);
    byte[] buffer = new byte[bufferSize];
    try {
        inputView.readFully(buffer);
    } catch (IOException e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not read TestInputView.");
    }
    assertEquals(inputView.getCurrentPositionInSegment(), bufferSize);
    assertArrayEquals(expected, buffer);
}

Example 22 with Random

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

the class PagedViewsTest method testReadFullyWithNotEnoughData.

@Test
public void testReadFullyWithNotEnoughData() {
    int bufferSize = 100;
    int bytes2Write = 99;
    int segmentSize = 30;
    byte[] expected = new byte[bytes2Write];
    new Random().nextBytes(expected);
    TestOutputView outputView = new TestOutputView(segmentSize);
    try {
        outputView.write(expected);
    } catch (Exception e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not write to TestOutputView.");
    }
    outputView.close();
    TestInputView inputView = new TestInputView(outputView.segments);
    byte[] buffer = new byte[bufferSize];
    boolean eofException = false;
    try {
        inputView.readFully(buffer);
    } catch (EOFException e) {
        //Expected exception
        eofException = true;
    } catch (IOException e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not read TestInputView.");
    }
    assertTrue("EOFException should have occurred.", eofException);
    int bytesRead = 0;
    try {
        bytesRead = inputView.read(buffer);
    } catch (Exception e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not read TestInputView.");
    }
    assertEquals(-1, bytesRead);
}

Example 23 with Random

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

the class PagedViewsTest method testReadFullyWithOffset.

@Test
public void testReadFullyWithOffset() {
    int bufferSize = 100;
    int segmentSize = 30;
    byte[] expected = new byte[bufferSize];
    new Random().nextBytes(expected);
    TestOutputView outputView = new TestOutputView(segmentSize);
    try {
        outputView.write(expected);
    } catch (Exception e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not write to TestOutputView.");
    }
    outputView.close();
    TestInputView inputView = new TestInputView(outputView.segments);
    byte[] buffer = new byte[2 * bufferSize];
    try {
        inputView.readFully(buffer, bufferSize, bufferSize);
    } catch (IOException e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not read TestInputView.");
    }
    assertEquals(inputView.getCurrentPositionInSegment(), bufferSize % segmentSize);
    byte[] tempBuffer = new byte[bufferSize];
    System.arraycopy(buffer, bufferSize, tempBuffer, 0, bufferSize);
    assertArrayEquals(expected, tempBuffer);
}

Example 24 with Random

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

the class PagedViewsTest method testReadFullyAcrossSegments.

@Test
public void testReadFullyAcrossSegments() {
    int bufferSize = 100;
    int segmentSize = 30;
    byte[] expected = new byte[bufferSize];
    new Random().nextBytes(expected);
    TestOutputView outputView = new TestOutputView(segmentSize);
    try {
        outputView.write(expected);
    } catch (Exception e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not write to TestOutputView.");
    }
    outputView.close();
    TestInputView inputView = new TestInputView(outputView.segments);
    byte[] buffer = new byte[bufferSize];
    try {
        inputView.readFully(buffer);
    } catch (IOException e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not read TestInputView.");
    }
    assertEquals(inputView.getCurrentPositionInSegment(), bufferSize % segmentSize);
    assertArrayEquals(expected, buffer);
}

Example 25 with Random

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

the class PagedViewsTest method testEmptyingInputView.

@Test
public void testEmptyingInputView() {
    int bufferSize = 100;
    int bytes2Write = 75;
    int segmentSize = 30;
    byte[] expected = new byte[bytes2Write];
    new Random().nextBytes(expected);
    TestOutputView outputView = new TestOutputView(segmentSize);
    try {
        outputView.write(expected);
    } catch (Exception e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not write to TestOutputView.");
    }
    outputView.close();
    TestInputView inputView = new TestInputView(outputView.segments);
    byte[] buffer = new byte[bufferSize];
    int bytesRead = 0;
    try {
        bytesRead = inputView.read(buffer);
    } catch (IOException e) {
        e.printStackTrace();
        fail("Unexpected exception: Could not read TestInputView.");
    }
    assertEquals(bytes2Write, bytesRead);
    byte[] tempBuffer = new byte[bytesRead];
    System.arraycopy(buffer, 0, tempBuffer, 0, bytesRead);
    assertArrayEquals(expected, tempBuffer);
    try {
        bytesRead = inputView.read(buffer);
    } catch (IOException e) {
        e.printStackTrace();
        fail("Unexpected exception: Input view should be empty and thus return -1.");
    }
    assertEquals(-1, bytesRead);
    assertEquals(inputView.getCurrentPositionInSegment(), bytes2Write % segmentSize);
}