/** {@inheritDoc} */
    @Override
    public Serializable execute() {
      int arg = this.<Integer>argument(0);

      try {
        if (log.isInfoEnabled()) log.info("Executing job [job=" + this + ", arg=" + arg + ']');

        startSignal.countDown();

        try {
          if (!startSignal.await(WAIT_TIME, TimeUnit.MILLISECONDS)) fail();

          if (arg == 1) {
            if (log.isInfoEnabled()) log.info("Job one is proceeding.");
          } else Thread.sleep(WAIT_TIME);
        } catch (InterruptedException e) {
          if (log.isInfoEnabled())
            log.info("Job got cancelled [arg=" + arg + ", ses=" + ses + ", e=" + e + ']');

          return 0;
        }

        if (log.isInfoEnabled()) log.info("Completing job: " + ses);

        return argument(0);
      } finally {
        stopSignal.countDown();

        processedCnt++;
      }
    }
  /**
   * @param concurrency Concurrency.
   * @param isolation Isolation.
   * @throws GridException If test failed.
   */
  private void checkTransactionTimeout(
      GridCacheTxConcurrency concurrency, GridCacheTxIsolation isolation) throws Exception {

    boolean wasEx = false;

    GridCacheTx tx = null;

    try {
      GridCache<Integer, String> cache = grid.cache(null);

      tx = cache.txStart(concurrency, isolation, 50, 0);

      cache.put(1, "1");

      Thread.sleep(100);

      cache.put(1, "2");

      tx.commit();
    } catch (GridCacheTxOptimisticException e) {
      info("Received expected optimistic exception: " + e.getMessage());

      wasEx = true;

      tx.rollback();
    } catch (GridCacheTxTimeoutException e) {
      info("Received expected timeout exception: " + e.getMessage());

      wasEx = true;

      tx.rollback();
    }

    assert wasEx;
  }
  /** @throws Exception If failed. */
  public void testDisabledRest() throws Exception {
    restEnabled = false;

    final Grid g = startGrid("disabled-rest");

    try {
      Thread.sleep(2 * TOP_REFRESH_FREQ);

      // As long as we have round robin load balancer this will cause every node to be queried.
      for (int i = 0; i < NODES_CNT + 1; i++)
        assertEquals(NODES_CNT + 1, client.compute().refreshTopology(false, false).size());

      final GridClientData data = client.data(PARTITIONED_CACHE_NAME);

      // Check rest-disabled node is unavailable.
      try {
        String affKey;

        do {
          affKey = UUID.randomUUID().toString();
        } while (!data.affinity(affKey).equals(g.localNode().id()));

        data.put(affKey, "asdf");

        assertEquals("asdf", cache(0, PARTITIONED_CACHE_NAME).get(affKey));
      } catch (GridServerUnreachableException e) {
        // Thrown for direct client-node connections.
        assertTrue(
            "Unexpected exception message: " + e.getMessage(),
            e.getMessage()
                .startsWith("No available endpoints to connect (is rest enabled for this node?)"));
      } catch (GridClientException e) {
        // Thrown for routed client-router-node connections.
        String msg = e.getMessage();

        assertTrue(
            "Unexpected exception message: " + msg,
            protocol() == GridClientProtocol.TCP
                ? msg.contains("No available endpoints to connect (is rest enabled for this node?)")
                : // TCP router.
                msg.startsWith(
                    "No available nodes on the router for destination node ID")); // HTTP router.
      }

      // Check rest-enabled nodes are available.
      String affKey;

      do {
        affKey = UUID.randomUUID().toString();
      } while (data.affinity(affKey).equals(g.localNode().id()));

      data.put(affKey, "fdsa");

      assertEquals("fdsa", cache(0, PARTITIONED_CACHE_NAME).get(affKey));
    } finally {
      restEnabled = true;

      G.stop(g.name(), true);
    }
  }
  /** @throws Exception If failed. */
  public void testAffinityPut() throws Exception {
    Thread.sleep(2 * TOP_REFRESH_FREQ);

    assertEquals(NODES_CNT, client.compute().refreshTopology(false, false).size());

    Map<UUID, Grid> gridsByLocNode = new HashMap<>(NODES_CNT);

    GridClientData partitioned = client.data(PARTITIONED_CACHE_NAME);

    GridClientCompute compute = client.compute();

    for (int i = 0; i < NODES_CNT; i++) gridsByLocNode.put(grid(i).localNode().id(), grid(i));

    for (int i = 0; i < 100; i++) {
      String key = "key" + i;

      UUID primaryNodeId = grid(0).mapKeyToNode(PARTITIONED_CACHE_NAME, key).id();

      assertEquals("Affinity mismatch for key: " + key, primaryNodeId, partitioned.affinity(key));

      assertEquals(primaryNodeId, partitioned.affinity(key));

      // Must go to primary node only. Since backup count is 0, value must present on
      // primary node only.
      partitioned.put(key, "val" + key);

      for (Map.Entry<UUID, Grid> entry : gridsByLocNode.entrySet()) {
        Object val = entry.getValue().cache(PARTITIONED_CACHE_NAME).peek(key);

        if (primaryNodeId.equals(entry.getKey())) assertEquals("val" + key, val);
        else assertNull(val);
      }
    }

    // Now check that we will see value in near cache in pinned mode.
    for (int i = 100; i < 200; i++) {
      String pinnedKey = "key" + i;

      UUID primaryNodeId = grid(0).mapKeyToNode(PARTITIONED_CACHE_NAME, pinnedKey).id();

      UUID pinnedNodeId = F.first(F.view(gridsByLocNode.keySet(), F.notEqualTo(primaryNodeId)));

      GridClientNode node = compute.node(pinnedNodeId);

      partitioned.pinNodes(node).put(pinnedKey, "val" + pinnedKey);

      for (Map.Entry<UUID, Grid> entry : gridsByLocNode.entrySet()) {
        Object val = entry.getValue().cache(PARTITIONED_CACHE_NAME).peek(pinnedKey);

        if (primaryNodeId.equals(entry.getKey()) || pinnedNodeId.equals(entry.getKey()))
          assertEquals("val" + pinnedKey, val);
        else assertNull(val);
      }
    }
  }