Examples with Resource org.neo4j.graphdb.Resource used on opensource projects

Example 11 with Resource

use of org.neo4j.graphdb.Resource in project neo4j by neo4j.

the class StoreCopyCheckPointMutexTest method shouldPropagateStoreCopyActionFailureToOtherStoreCopyRequests.

@Test
public void shouldPropagateStoreCopyActionFailureToOtherStoreCopyRequests() throws Exception {
    // GIVEN
    Barrier.Control barrier = new Barrier.Control();
    IOException controlledFailure = new IOException("My own fault");
    AtomicReference<Future<Object>> secondRequest = new AtomicReference<>();
    ThrowingAction<IOException> controllableAndFailingAction = new ThrowingAction<IOException>() {

        @Override
        public void apply() throws IOException {
            // Now that we know we're first, start the second request...
            secondRequest.set(t3.execute(state -> mutex.storeCopy(ASSERT_NOT_CALLED)));
            // ...and wait for it to reach its destination
            barrier.awaitUninterruptibly();
            try {
                // OK, second request has made progress into the request, so we can now produce our failure
                throw controlledFailure;
            } finally {
                barrier.release();
            }
        }
    };
    Future<Object> firstRequest = t2.execute(state -> mutex.storeCopy(controllableAndFailingAction));
    while (secondRequest.get() == null) {
        parkARandomWhile();
    }
    t3.get().waitUntilWaiting(details -> details.isAt(StoreCopyCheckPointMutex.class, "waitForFirstStoreCopyActionToComplete"));
    // WHEN
    barrier.reached();
    // THEN
    try {
        firstRequest.get();
    } catch (ExecutionException e) {
        assertSame(controlledFailure, e.getCause());
    }
    try {
        secondRequest.get().get();
    } catch (ExecutionException e) {
        Throwable cooperativeActionFailure = e.getCause();
        assertThat(cooperativeActionFailure.getMessage(), containsString("Co-operative"));
        assertSame(controlledFailure, cooperativeActionFailure.getCause());
    }
    // WHEN afterwards trying another store-copy
    CountingAction action = new CountingAction();
    try (Resource lock = mutex.storeCopy(action)) {
        // THEN
        assertEquals(1, action.count());
    }
}

Example 12 with Resource

use of org.neo4j.graphdb.Resource in project neo4j by neo4j.

the class StoreCopyCheckPointMutexTest method shouldHandleMultipleConcurrentStoreCopyRequests.

@Test
public void shouldHandleMultipleConcurrentStoreCopyRequests() throws Throwable {
    // GIVEN
    Race race = new Race();
    CountingAction action = new CountingAction();
    int threads = Runtime.getRuntime().availableProcessors() * 10;
    race.addContestants(threads, throwing(() -> {
        parkARandomWhile();
        try (Resource lock = mutex.storeCopy(action)) {
            parkARandomWhile();
        }
    }));
    race.go();
    // THEN
    // It's hard to make predictions about what should have been seen. Most importantly is that
    // The lock doesn't hang any requests and that number of calls to the action less than number of threads
    assertThat(action.count(), lessThan(threads));
}