Examples with FirableCursor com.apple.foundationdb.record.cursors.FirableCursor used on opensource projects

Example 1 with FirableCursor

use of com.apple.foundationdb.record.cursors.FirableCursor in project fdb-record-layer by FoundationDB.

the class RecordCursorTest method mapPipelinedErrorAtConcurrentCompletion.

/**
 * Test that when the outer cursor and an inner future complete "at the same time" (as close as we can) that the
 * error is propagated.
 *
 * @throws ExecutionException from futures joined in the test
 * @throws InterruptedException from futures joined in the test
 */
@Test
public void mapPipelinedErrorAtConcurrentCompletion() throws ExecutionException, InterruptedException {
    final RuntimeException runtimeEx = new RuntimeException("some random exception");
    List<CompletableFuture<Integer>> futures = Arrays.asList(new CompletableFuture<>(), new CompletableFuture<>(), new CompletableFuture<>());
    FirableCursor<Integer> firableCursor = new FirableCursor<>(RecordCursor.fromList(Arrays.asList(0, 1, 2)));
    RecordCursor<Integer> cursor = firableCursor.mapPipelined(futures::get, 2);
    CompletableFuture<RecordCursorResult<Integer>> resultFuture = cursor.onNext();
    assertFalse(resultFuture.isDone());
    firableCursor.fire();
    assertFalse(resultFuture.isDone());
    futures.get(0).complete(1066);
    RecordCursorResult<Integer> result = resultFuture.get();
    assertTrue(result.hasNext());
    assertEquals(1066, (int) result.get());
    // The (non-exceptional) firable cursor completes at "the same time" as the exceptional inner result.
    CompletableFuture<RecordCursorResult<Integer>> secondResultFuture = cursor.onNext();
    assertFalse(secondResultFuture.isDone());
    firableCursor.fire();
    assertFalse(secondResultFuture.isDone());
    firableCursor.fire();
    futures.get(1).completeExceptionally(runtimeEx);
    ExecutionException executionEx = assertThrows(ExecutionException.class, secondResultFuture::get);
    assertNotNull(executionEx.getCause());
    assertEquals(runtimeEx, executionEx.getCause());
    // Should get the same exception again
    executionEx = assertThrows(ExecutionException.class, () -> cursor.onNext().get());
    assertEquals(runtimeEx, executionEx.getCause());
}

Example 2 with FirableCursor

use of com.apple.foundationdb.record.cursors.FirableCursor in project fdb-record-layer by FoundationDB.

the class UnorderedUnionCursorTest method loopIterationWithLimit.

@Test
public void loopIterationWithLimit() throws ExecutionException, InterruptedException {
    FDBStoreTimer timer = new FDBStoreTimer();
    FirableCursor<Integer> secondCursor = new FirableCursor<>(RecordCursor.fromList(Arrays.asList(3, 4)));
    RecordCursor<Integer> cursor = UnorderedUnionCursor.create(Arrays.asList(continuation -> RecordCursor.fromList(Arrays.asList(1, 2), continuation).limitRowsTo(1), continuation -> secondCursor), null, timer);
    RecordCursorResult<Integer> cursorResult = cursor.getNext();
    assertEquals(1, (int) cursorResult.get());
    CompletableFuture<RecordCursorResult<Integer>> cursorResultFuture = cursor.onNext();
    assertFalse(cursorResultFuture.isDone());
    secondCursor.fire();
    cursorResult = cursorResultFuture.get();
    assertEquals(3, (int) cursorResult.get());
    cursorResultFuture = cursor.onNext();
    assertFalse(cursorResultFuture.isDone());
    secondCursor.fire();
    cursorResult = cursorResultFuture.get();
    assertEquals(4, (int) cursorResult.get());
    cursorResultFuture = cursor.onNext();
    assertFalse(cursorResultFuture.isDone());
    secondCursor.fire();
    cursorResult = cursorResultFuture.get();
    assertFalse(cursorResult.hasNext());
    assertEquals(RecordCursor.NoNextReason.RETURN_LIMIT_REACHED, cursorResult.getNoNextReason());
    assertThat(timer.getCount(FDBStoreTimer.Events.QUERY_INTERSECTION), lessThanOrEqualTo(5));
}

Example 3 with FirableCursor

use of com.apple.foundationdb.record.cursors.FirableCursor in project fdb-record-layer by FoundationDB.

the class RecordCursorTest method flatMapPipelineErrorPropagation.

@Test
public void flatMapPipelineErrorPropagation() throws ExecutionException, InterruptedException {
    FirableCursor<String> firableCursor1 = new FirableCursor<>(RecordCursor.fromList(Collections.singletonList("hello")));
    FirableCursor<String> firableCursor2 = new FirableCursor<>(new BrokenCursor());
    List<FirableCursor<String>> firableCursors = Arrays.asList(firableCursor1, firableCursor2);
    FirableCursor<Integer> outerCursor = new FirableCursor<>(RecordCursor.fromList(Arrays.asList(0, 1)));
    RecordCursor<String> cursor = RecordCursor.flatMapPipelined(cont -> outerCursor, (a, cont) -> firableCursors.get(a), null, 10);
    outerCursor.fire();
    firableCursor1.fire();
    RecordCursorResult<String> cursorResult = cursor.onNext().get();
    assertTrue(cursorResult.hasNext());
    assertEquals("hello", cursorResult.get());
    CompletableFuture<RecordCursorResult<String>> nextResultFuture = cursor.onNext();
    firableCursor1.fire();
    assertFalse(nextResultFuture.isDone());
    outerCursor.fire();
    firableCursor2.fire();
    ExecutionException e = assertThrows(ExecutionException.class, nextResultFuture::get);
    assertNotNull(e.getCause());
    assertThat(e.getCause(), instanceOf(RuntimeException.class));
    assertEquals("sorry", e.getCause().getMessage());
    RecordCursor<Integer> outerCursorError = RecordCursor.flatMapPipelined(cont -> new BrokenCursor(), (s, cont) -> RecordCursor.fromList(Collections.singletonList(s.length())), null, 10);
    e = assertThrows(ExecutionException.class, () -> outerCursorError.onNext().get());
    assertNotNull(e.getCause());
    assertThat(e.getCause(), instanceOf(RuntimeException.class));
    assertEquals("sorry", e.getCause().getMessage());
}

Example 4 with FirableCursor

use of com.apple.foundationdb.record.cursors.FirableCursor in project fdb-record-layer by FoundationDB.

the class ProbableIntersectionCursorTest method basicIntersection.

/**
 * Show that a basic intersection succeeds.
 */
@Test
public void basicIntersection() {
    final FDBStoreTimer timer = new FDBStoreTimer();
    final Iterator<Integer> iterator1 = IntStream.iterate(0, x -> x + 2).limit(150).iterator();
    final Iterator<Integer> iterator2 = IntStream.iterate(0, x -> x + 3).limit(100).iterator();
    final FirableCursor<Integer> cursor1 = new FirableCursor<>(RecordCursor.fromIterator(iterator1));
    final FirableCursor<Integer> cursor2 = new FirableCursor<>(RecordCursor.fromIterator(iterator2));
    final RecordCursor<Integer> intersectionCursor = ProbableIntersectionCursor.create(Collections::singletonList, Arrays.asList(bignore -> cursor1, bignore -> cursor2), null, timer);
    // Intersection consumes first cursor
    cursor1.fireAll();
    CompletableFuture<RecordCursorResult<Integer>> firstFuture = intersectionCursor.onNext();
    cursor2.fire();
    RecordCursorResult<Integer> firstResult = firstFuture.join();
    assertEquals(0, (int) firstResult.get());
    assertThat(firstResult.hasNext(), is(true));
    assertEquals(cursor1.getNext().getNoNextReason(), RecordCursor.NoNextReason.SOURCE_EXHAUSTED);
    // Intersection consumes second cursor as they come
    cursor2.fireAll();
    AtomicInteger falsePositives = new AtomicInteger();
    AsyncUtil.whileTrue(() -> intersectionCursor.onNext().thenApply(result -> {
        if (result.hasNext()) {
            int value = result.get();
            // every result *must* be divisible by 3
            assertEquals(0, value % 3);
            if (value % 2 != 0) {
                // most results should be divisible by 2
                falsePositives.incrementAndGet();
            }
            assertThat(result.getContinuation().isEnd(), is(false));
            assertNotNull(result.getContinuation().toBytes());
            try {
                RecordCursorProto.ProbableIntersectionContinuation protoContinuation = RecordCursorProto.ProbableIntersectionContinuation.parseFrom(result.getContinuation().toBytes());
                assertEquals(2, protoContinuation.getChildStateCount());
                assertThat(protoContinuation.getChildState(0).getExhausted(), is(true));
                assertThat(protoContinuation.getChildState(0).hasContinuation(), is(false));
                assertThat(protoContinuation.getChildState(1).getExhausted(), is(false));
                assertThat(protoContinuation.getChildState(1).hasContinuation(), is(true));
            } catch (InvalidProtocolBufferException e) {
                throw new RecordCoreException("error parsing proto continuation", e);
            }
        } else {
            assertThat(result.getNoNextReason().isSourceExhausted(), is(true));
            assertThat(result.getContinuation().isEnd(), is(true));
            assertNull(result.getContinuation().toBytes());
        }
        return result.hasNext();
    }), intersectionCursor.getExecutor()).join();
    assertThat(falsePositives.get(), lessThan(5));
    assertEquals(50 + falsePositives.get(), timer.getCount(FDBStoreTimer.Counts.QUERY_INTERSECTION_PLAN_MATCHES));
    assertEquals(200 - falsePositives.get(), timer.getCount(FDBStoreTimer.Counts.QUERY_INTERSECTION_PLAN_NONMATCHES));
}

Example 5 with FirableCursor

use of com.apple.foundationdb.record.cursors.FirableCursor in project fdb-record-layer by FoundationDB.

the class ProbableIntersectionCursorTest method loopIterationWithLimit.

@Test
public void loopIterationWithLimit() throws ExecutionException, InterruptedException {
    FDBStoreTimer timer = new FDBStoreTimer();
    FirableCursor<Integer> secondCursor = new FirableCursor<>(RecordCursor.fromList(Arrays.asList(2, 1)));
    RecordCursor<Integer> cursor = ProbableIntersectionCursor.create(Collections::singletonList, Arrays.asList(continuation -> RecordCursor.fromList(Arrays.asList(1, 2), continuation).limitRowsTo(1), continuation -> secondCursor), null, timer);
    CompletableFuture<RecordCursorResult<Integer>> cursorResultFuture = cursor.onNext();
    secondCursor.fire();
    assertFalse(cursorResultFuture.isDone());
    secondCursor.fire();
    RecordCursorResult<Integer> cursorResult = cursorResultFuture.get();
    assertEquals(1, (int) cursorResult.get());
    secondCursor.fire();
    cursorResult = cursor.getNext();
    assertEquals(RecordCursor.NoNextReason.RETURN_LIMIT_REACHED, cursorResult.getNoNextReason());
    assertThat(timer.getCount(FDBStoreTimer.Events.QUERY_INTERSECTION), lessThanOrEqualTo(5));
}