Examples with FailingRequestProcessor io.pravega.shared.protocol.netty.FailingRequestProcessor used on opensource projects

Example 1 with FailingRequestProcessor

use of io.pravega.shared.protocol.netty.FailingRequestProcessor in project pravega by pravega.

the class AppendProcessorTest method testDelayedDataAppended.

/**
 * Test to ensure newer appends are processed only after successfully sending the DataAppended acknowledgement
 * back to client. This test tests the following:
 * - If sending first DataAppended is blocked, ensure future appends are not written to store.
 * - Once the first DataAppended is sent ensure the remaining appends are written to store and DataAppended ack'ed
 * back.
 */
@Test(timeout = 15 * 1000)
public void testDelayedDataAppended() throws Exception {
    ReusableLatch firstStoreAppendInvoked = new ReusableLatch();
    ReusableLatch completeFirstDataAppendedAck = new ReusableLatch();
    ReusableLatch secondStoreAppendInvoked = new ReusableLatch();
    @Cleanup("shutdownNow") ScheduledExecutorService nettyExecutor = ExecutorServiceHelpers.newScheduledThreadPool(1, "Netty-threadPool");
    String streamSegmentName = "testDelayedAppend";
    UUID clientId = UUID.randomUUID();
    byte[] data = new byte[] { 1, 2, 3, 4, 6, 7, 8, 9 };
    StreamSegmentStore store = mock(StreamSegmentStore.class);
    ServerConnection connection = mock(ServerConnection.class);
    // Ensure the first DataAppended is hung/delayed.
    doAnswer(invocation -> {
        firstStoreAppendInvoked.release();
        // wait, simulating a hung/delayed dataAppended acknowledgement.
        completeFirstDataAppendedAck.await();
        return null;
    }).doAnswer(invocation -> {
        secondStoreAppendInvoked.release();
        return null;
    }).when(connection).send(any(DataAppended.class));
    AppendProcessor processor = new AppendProcessor(store, connection, new FailingRequestProcessor(), null);
    CompletableFuture<SegmentProperties> propsFuture = CompletableFuture.completedFuture(StreamSegmentInformation.builder().name(streamSegmentName).build());
    when(store.getStreamSegmentInfo(streamSegmentName, true, AppendProcessor.TIMEOUT)).thenReturn(propsFuture);
    processor.setupAppend(new SetupAppend(1, clientId, streamSegmentName, ""));
    verify(store).getStreamSegmentInfo(streamSegmentName, true, AppendProcessor.TIMEOUT);
    CompletableFuture<Void> result = CompletableFuture.completedFuture(null);
    int eventCount = 100;
    when(store.append(streamSegmentName, data, updateEventNumber(clientId, 100, SegmentMetadata.NULL_ATTRIBUTE_VALUE, eventCount), AppendProcessor.TIMEOUT)).thenReturn(result);
    // Trigger the first append, here the sending of DataAppended ack will be delayed/hung.
    nettyExecutor.submit(() -> processor.append(new Append(streamSegmentName, clientId, 100, eventCount, Unpooled.wrappedBuffer(data), null)));
    firstStoreAppendInvoked.await();
    verify(store).append(streamSegmentName, data, updateEventNumber(clientId, 100, SegmentMetadata.NULL_ATTRIBUTE_VALUE, eventCount), AppendProcessor.TIMEOUT);
    /* Trigger the next append. This should be completed immediately and should not cause a store.append to be
        invoked as the previous DataAppended ack is still not sent. */
    processor.append(new Append(streamSegmentName, clientId, 200, eventCount, Unpooled.wrappedBuffer(data), null));
    // Since the first Ack was never sent the next append should not be written to the store.
    verifyNoMoreInteractions(store);
    // Setup mock for check behaviour after the delayed/hung dataAppended completes.
    when(store.append(streamSegmentName, data, updateEventNumber(clientId, 200, 100, eventCount), AppendProcessor.TIMEOUT)).thenReturn(result);
    // Now ensure the dataAppended sent
    completeFirstDataAppendedAck.release();
    // wait until the next store append is invoked.
    secondStoreAppendInvoked.await();
    // Verify that the next store append invoked.
    verify(store).append(streamSegmentName, data, updateEventNumber(clientId, 200, 100, eventCount), AppendProcessor.TIMEOUT);
    // Verify two DataAppended acks are sent out.
    verify(connection, times(2)).send(any(DataAppended.class));
    verify(connection).send(new DataAppended(clientId, 100, Long.MIN_VALUE));
    verify(connection).send(new DataAppended(clientId, 200, 100));
}