@Override
      public Object call() {
        Region<Integer, String> r = getGemfireCache().getRegion(D_REFERENCE);
        Region<CustId, Customer> pr = getGemfireCache().getRegion(CUSTOMER);
        assertEquals(new Customer("name10", "address10"), pr.get(new CustId(10)));
        assertEquals("value10", r.get(10));
        return null;
      }
client connectes to an accessor and completes a transaction
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ClientServerTransactionDUnitTest.java