errorCount.incrementAndGet();
                    } finally {
                        endLatch.countDown();
                    }
                }
            });
        }

        startLatch.countDown();
        endLatch.await(10, TimeUnit.SECONDS);
        executor.shutdown();

        assertEquals(0, errorCount.get());

                            // Verify consistency
                            if (!"concurrentRule".equals(ruleId)) {
                                errorCount.incrementAndGet();
                            }
                            if (proc != processor) {
                                errorCount.incrementAndGet();
                            }

                            // Occasionally update (half the threads)