@Override
        public void run() {
          try {
            long stopTime = System.currentTimeMillis() + 5000;
            Random ran = new Random(System.currentTimeMillis());
            while (System.currentTimeMillis() < stopTime) {
              for (int i = 0; i < 10; i++) {
                CCRegion.put("cckey" + i, new DeltaValue("ccvalue" + ran.nextInt()));
              }
            }
            long events = CCRegion.getCachePerfStats().getDeltaFailedUpdates();
            assertThat(events > 0).describedAs("expected some failed deltas").isTrue();
          } catch (CacheException e) {
            fail("while performing concurrent operations", e);
          }
        }
Clear all existing transaction listeners and install the given listener.
geode-dunit/src/main/java/org/apache/geode/cache30/MultiVMRegionTestCase.java