Examples of java.nio.MappedByteBuffer.position()

java.nio.MappedByteBuffer.position()

        writeDataToFile(fileOfReadWriteFileChannel);
        mapped = readWriteFileChannel.map(MapMode.READ_ONLY, 0, CONTENT
                .length());
        assertEquals(CONTENT_LENGTH, mapped.limit());
        assertEquals(CONTENT_LENGTH, mapped.capacity());
        assertEquals(0, mapped.position());


        // map not change channel's position
        assertEquals(0, readOnlyFileChannel.position());
        assertEquals(0, readWriteFileChannel.position());
    }

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        this.writeDataToFile(fileOfReadOnlyFileChannel);
        MappedByteBuffer mapped = readOnlyFileChannel.map(MapMode.READ_ONLY,
                10, CONTENT_LENGTH - 10);
        assertEquals(CONTENT_LENGTH - 10, mapped.limit());
        assertEquals(CONTENT_LENGTH - 10, mapped.capacity());
        assertEquals(0, mapped.position());
    }


    /**
     * @tests java.nio.channels.FileChannel#map(MapMode,long,long)
     */

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    public void test_map_Private_NonZeroPosition() throws IOException {
        MappedByteBuffer mapped = readWriteFileChannel.map(MapMode.PRIVATE, 10,
                CONTENT_LENGTH - 10);
        assertEquals(CONTENT_LENGTH - 10, mapped.limit());
        assertEquals(CONTENT_LENGTH - 10, mapped.capacity());
        assertEquals(0, mapped.position());
    }


    /**
     * @tests java.nio.channels.FileChannel#map(MapMode,long,long)
     */

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        writeDataToFile(fileOfReadWriteFileChannel);
        MappedByteBuffer mapped = readWriteFileChannel.map(MapMode.READ_WRITE,
                10, CONTENT_LENGTH - 10);
        assertEquals(CONTENT_LENGTH - 10, mapped.limit());
        assertEquals(CONTENT.length() - 10, mapped.capacity());
        assertEquals(0, mapped.position());
        mapped.put(TEST_BYTES);
        ByteBuffer checkBuffer = ByteBuffer.allocate(CONTENT_LENGTH);
        readWriteFileChannel.read(checkBuffer);
        String expected = CONTENT.substring(0, 10) + "test"
                + CONTENT.substring(10 + "test".length());

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            assertEquals("Incorrectly mapped file channel for " + sizes[i]
                    + " position (capacity)", CONTENT_LEN, mapped.capacity());
            assertEquals("Incorrectly mapped file channel for " + sizes[i]
                    + " position (limit)", CONTENT_LEN, mapped.limit());
            assertEquals("Incorrectly mapped file channel for " + sizes[i]
                    + " position (position)", 0, mapped.position());


            // map not change channel's position
            assertEquals(0, readOnlyFileChannel.position());


            // Close the file and the channel before the next iteration

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            if (mapN >= mappedBuffers.length) // we have run out of data to read from
                break;
            MappedByteBuffer currentBuffer = mappedBuffers[mapN];
            if (offN > currentBuffer.limit())
                break;
            currentBuffer.position(offN);
            int bytesFromThisBuffer = Math.min(len, currentBuffer.remaining());
            currentBuffer.get(bytes, off, bytesFromThisBuffer);
            off += bytesFromThisBuffer;
            pos += bytesFromThisBuffer;
            totalRead += bytesFromThisBuffer;

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    for (MonitoringData d : values) {
      earliest = Math.min(d.getTimeStamp().getTime(), earliest);
      latest = Math.max(d.getTimeStamp().getTime(), latest);
    }
    Kryo kryo = SerializeUtil.createKryo();
    b.position(MonitoringDataStorage.FIRST_RECORD_POSITION);
    Output output = new Output(new ByteBufferOutputStream(b));
    for (MonitoringData data : values) {
      kryo.writeClassAndObject(output, data);
    }
    output.close();

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    Output output = new Output(new ByteBufferOutputStream(b));
    for (MonitoringData data : values) {
      kryo.writeClassAndObject(output, data);
    }
    output.close();
    int limit = b.position();
    
    b.putLong(MonitoringDataStorage.EARLIEST_POSITION, earliest);
    b.putLong(MonitoringDataStorage.LATEST_POSITION, latest);
    b.putInt(MonitoringDataStorage.LIMIT_POSITION, limit);
    ranAccess.close();

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    Input input = new Input(new ByteBufferInputStream(b));
    input.setPosition(MonitoringDataStorage.FIRST_RECORD_POSITION);
    assertEquals("blabla1",((MonitoringDataDummy)kryo.readClassAndObject(input)).value);
    assertEquals("blabla2",((MonitoringDataDummy)kryo.readClassAndObject(input)).value);
    assertNull(kryo.readClassAndObject(input));
    b.putInt(MonitoringDataStorage.LIMIT_POSITION, b.position());
    b.position(0);
    ranAccess.close();
    }
    
    @Test

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    input.setPosition(MonitoringDataStorage.FIRST_RECORD_POSITION);
    assertEquals("blabla1",((MonitoringDataDummy)kryo.readClassAndObject(input)).value);
    assertEquals("blabla2",((MonitoringDataDummy)kryo.readClassAndObject(input)).value);
    assertNull(kryo.readClassAndObject(input));
    b.putInt(MonitoringDataStorage.LIMIT_POSITION, b.position());
    b.position(0);
    ranAccess.close();
    }
    
    @Test
    public void test_microbenchmark() throws IOException{

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