Examples of com.orientechnologies.common.directmemory.ODirectMemory

Package com.orientechnologies.common.directmemory

Examples of com.orientechnologies.common.directmemory.ODirectMemory

com.orientechnologies.common.directmemory.ODirectMemory
Abstraction of different kind of implementations of non-GC memory, memory that managed not by GC but directly by application. Access to such memory is slower than to "native" Java memory but we get performance gain eliminating GC overhead. The main application of such memory different types of caches. @author Artem Orobets, Andrey Lomakin


@Test
public class JNADirectMemoryTest {
  public void testLong() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    long value = rnd.nextLong();


    long pointer = directMemory.allocate(OLongSerializer.LONG_SIZE);
    directMemory.setLong(pointer, value);


    Assert.assertEquals(directMemory.getLong(pointer), value);


    directMemory.free(pointer);
  }

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    directMemory.free(pointer);
  }


  public void testInt() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    int value = rnd.nextInt();
    long pointer = directMemory.allocate(OIntegerSerializer.INT_SIZE);
    directMemory.setInt(pointer, value);


    Assert.assertEquals(directMemory.getInt(pointer), value);


    directMemory.free(pointer);
  }

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    directMemory.free(pointer);
  }


  public void testChar() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    char value = (char) rnd.nextInt();
    long pointer = directMemory.allocate(OCharSerializer.CHAR_SIZE);
    directMemory.setChar(pointer, value);


    Assert.assertEquals(directMemory.getChar(pointer), value);


    directMemory.free(pointer);
  }

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    directMemory.free(pointer);
  }


  public void testByte() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    byte[] value = new byte[1];
    rnd.nextBytes(value);


    long pointer = directMemory.allocate(1);
    directMemory.setByte(pointer, value[0]);


    Assert.assertEquals(directMemory.getByte(pointer), value[0]);


    directMemory.free(pointer);
  }

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  }




  public void testBytesWithoutOffset() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    byte[] value = new byte[256];
    rnd.nextBytes(value);


    long pointer = directMemory.allocate(value.length);
    directMemory.set(pointer, value, 0, value.length);


    Assert.assertEquals(directMemory.get(pointer, value.length), value);
    Assert.assertEquals(directMemory.get(pointer, value.length / 2), Arrays.copyOf(value, value.length / 2));


    byte[] result = new byte[value.length];
    directMemory.get(pointer, result, value.length / 2, value.length / 2);


    byte[] expectedResult = new byte[value.length];
    System.arraycopy(value, 0, expectedResult, expectedResult.length / 2, expectedResult.length / 2);


    Assert.assertEquals(result, expectedResult);


    directMemory.free(pointer);
  }

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    directMemory.free(pointer);
  }


  public void testBytesWithOffset() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    byte[] value = new byte[256];
    rnd.nextBytes(value);


    long pointer = directMemory.allocate(value.length);
    directMemory.set(pointer, value, value.length / 2, value.length / 2);


    Assert.assertEquals(directMemory.get(pointer, value.length / 2), Arrays.copyOfRange(value, value.length / 2, value.length));


    directMemory.free(pointer);
  }

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    directMemory.free(pointer);
  }


  public void testCopyData() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    byte[] value = new byte[256];
    rnd.nextBytes(value);


    long pointer = directMemory.allocate(value.length);
    directMemory.set(pointer, value, 0, value.length);


    directMemory.moveData(pointer, pointer + value.length / 2, value.length / 2);


    System.arraycopy(value, 0, value, value.length / 2, value.length / 2);


    Assert.assertEquals(value, directMemory.get(pointer, value.length));


    directMemory.free(pointer);
  }

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    directMemory.free(pointer);
  }


  public void testCopyDataOverlap() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    byte[] value = new byte[256];
    rnd.nextBytes(value);


    long pointer = directMemory.allocate(value.length);
    directMemory.set(pointer, value, 0, value.length);


    directMemory.moveData(pointer, pointer + 1, value.length / 3);


    System.arraycopy(value, 0, value, 1, value.length / 3);


    Assert.assertEquals(value, directMemory.get(pointer, value.length));


    directMemory.free(pointer);
  }

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    directMemory.free(pointer);
  }


  public void testCopyDataOverlapInterval() {
    final Random rnd = new Random();
    ODirectMemory directMemory = new OJNADirectMemory();


    byte[] value = new byte[256];
    rnd.nextBytes(value);


    long pointer = directMemory.allocate(value.length);
    directMemory.set(pointer, value, 0, value.length);


    directMemory.moveData(pointer + 2, pointer + 5, value.length / 3);


    System.arraycopy(value, 2, value, 5, value.length / 3);


    Assert.assertEquals(value, directMemory.get(pointer, value.length));


    directMemory.free(pointer);
  }

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Related Classes of com.orientechnologies.common.directmemory.ODirectMemory

com.orientechnologies.nio.JNADirectMemoryTest

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