AdaptiveRecvByteBufAllocatorTest Class — netty Architecture

Source Code

transport/src/test/java/io/netty/channel/AdaptiveRecvByteBufAllocatorTest.java lines 31–168

public class AdaptiveRecvByteBufAllocatorTest {
    @Mock
    private ChannelConfig config;
    private final ByteBufAllocator alloc = UnpooledByteBufAllocator.DEFAULT;
    private RecvByteBufAllocator.ExtendedHandle handle;

    @BeforeEach
    public void setup() {
        config = mock(ChannelConfig.class);
        when(config.isAutoRead()).thenReturn(true);
        AdaptiveRecvByteBufAllocator recvByteBufAllocator = new AdaptiveRecvByteBufAllocator(64, 512, 1024 * 1024 * 10);
        handle = (RecvByteBufAllocator.ExtendedHandle) recvByteBufAllocator.newHandle();
        handle.reset(config);
    }

    @Test
    public void rampUpBeforeReadCompleteWhenLargeDataPending() {
        // Simulate that there is always more data when we attempt to read so we should always ramp up.
        allocReadExpected(handle, alloc, 512);
        allocReadExpected(handle, alloc, 8192);
        allocReadExpected(handle, alloc, 131072);
        allocReadExpected(handle, alloc, 2097152);
        handle.readComplete();

        handle.reset(config);
        allocReadExpected(handle, alloc, 8388608);
    }

    @Test
    public void memoryAllocationIntervalsTest() {
        computingNext(512, 512);
        computingNext(8192, 1110);
        computingNext(8192, 1200);
        computingNext(4096, 1300);
        computingNext(4096, 1500);
        computingNext(2048, 1700);
        computingNext(2048, 1550);
        computingNext(2048, 2000);
        computingNext(2048, 1900);
    }

    private void computingNext(long expectedSize, int actualReadBytes) {
        assertEquals(expectedSize, handle.guess());
        handle.reset(config);
        handle.lastBytesRead(actualReadBytes);
        handle.readComplete();
    }

    @Test
    public void lastPartialReadDoesNotRampDown() {
        allocReadExpected(handle, alloc, 512);
        // Simulate there is just 1 byte remaining which is unread. However the total bytes in the current read cycle
        // means that we should stay at the current step for the next ready cycle.
        allocRead(handle, alloc, 8192, 1);
        handle.readComplete();

        handle.reset(config);
        allocReadExpected(handle, alloc, 8192);
    }

    @Test
    public void lastPartialReadCanRampUp() {
        allocReadExpected(handle, alloc, 512);
        // We simulate there is just 1 less byte than we try to read, but because of the adaptive steps the total amount
        // of bytes read for this read cycle steps up to prepare for the next read cycle.
        allocRead(handle, alloc, 8192, 8191);
        handle.readComplete();

        handle.reset(config);
        allocReadExpected(handle, alloc, 131072);
    }

    @Test
    public void doesNotExceedMaximum() {
        AdaptiveRecvByteBufAllocator recvByteBufAllocator = new AdaptiveRecvByteBufAllocator(64, 9000, 9000);
        RecvByteBufAllocator.ExtendedHandle handle =
                (RecvByteBufAllocator.ExtendedHandle) recvByteBufAllocator.newHandle();
        handle.reset(config);
        allocReadExpected(handle, alloc, 8192);
    }