/** Initializes future. */
  @SuppressWarnings({"unchecked"})
  void finish() {
    if (mappings != null) {
      finish(mappings.values());

      markInitialized();

      if (!isSync()) {
        boolean complete = true;

        for (GridFuture<?> f : pending())
          // Mini-future in non-sync mode gets done when message gets sent.
          if (isMini(f) && !f.isDone()) complete = false;

        if (complete) onComplete();
      }
    } else {
      assert !commit;

      try {
        tx.rollback();
      } catch (GridException e) {
        U.error(log, "Failed to rollback empty transaction: " + tx, e);
      }

      markInitialized();
    }
  }
  /**
   * @param expJobs Expected jobs number.
   * @param taskStarter Task started.
   * @throws Exception If failed.
   */
  private void testMasterLeaveAwareCallback(
      int expJobs, GridClosure<GridProjection, GridFuture<?>> taskStarter) throws Exception {
    jobLatch = new CountDownLatch(expJobs);
    invokeLatch = new CountDownLatch(expJobs);

    for (int i = 0; i < GRID_CNT; i++) startGrid(i);

    int lastGridIdx = GRID_CNT - 1;

    GridFuture<?> fut = taskStarter.apply(grid(lastGridIdx).forPredicate(excludeLastPredicate()));

    jobLatch.await();

    stopGrid(lastGridIdx, true);

    latch.countDown();

    assert invokeLatch.await(5000, MILLISECONDS);

    try {
      fut.get();
    } catch (GridException e) {
      log.debug("Task failed: " + e);
    }
  }
    void cancelAll() {
      GridException err =
          new GridException("Data loader has been cancelled: " + GridDataLoaderImpl.this);

      for (GridFuture<?> f : locFuts) {
        try {
          f.cancel();
        } catch (GridException e) {
          U.error(log, "Failed to cancel mini-future.", e);
        }
      }

      for (GridFutureAdapter<?> f : reqs.values()) f.onDone(err);
    }
    /**
     * @param entries Entries to submit.
     * @param curFut Current future.
     * @throws GridInterruptedException If interrupted.
     */
    private void submit(final List<Map.Entry<K, V>> entries, final GridFutureAdapter<Object> curFut)
        throws GridInterruptedException {
      assert entries != null;
      assert !entries.isEmpty();
      assert curFut != null;

      incrementActiveTasks();

      GridFuture<Object> fut;
      if (isLocNode) {
        fut =
            ctx.closure()
                .callLocalSafe(
                    new GridDataLoadUpdateJob<>(ctx, log, cacheName, entries, false, updater),
                    false);

        locFuts.add(fut);

        fut.listenAsync(
            new GridInClosure<GridFuture<Object>>() {
              @Override
              public void apply(GridFuture<Object> t) {
                try {
                  boolean rmv = locFuts.remove(t);

                  assert rmv;

                  curFut.onDone(t.get());
                } catch (GridException e) {
                  curFut.onDone(e);
                }
              }
            });
      } else {
        byte[] entriesBytes;

        try {
          entriesBytes = ctx.config().getMarshaller().marshal(entries);

          if (updaterBytes == null) {
            assert updater != null;

            updaterBytes = ctx.config().getMarshaller().marshal(updater);
          }

          if (topicBytes == null) topicBytes = ctx.config().getMarshaller().marshal(topic);
        } catch (GridException e) {
          U.error(log, "Failed to marshal (request will not be sent).", e);

          return;
        }

        GridDeployment dep = null;
        GridPeerDeployAware jobPda0 = null;

        if (ctx.deploy().enabled()) {
          try {
            jobPda0 = jobPda;

            assert jobPda0 != null;

            dep = ctx.deploy().deploy(jobPda0.deployClass(), jobPda0.classLoader());
          } catch (GridException e) {
            U.error(
                log,
                "Failed to deploy class (request will not be sent): " + jobPda0.deployClass(),
                e);

            return;
          }

          if (dep == null)
            U.warn(log, "Failed to deploy class (request will be sent): " + jobPda0.deployClass());
        }

        long reqId = idGen.incrementAndGet();

        fut = curFut;

        reqs.put(reqId, (GridFutureAdapter<Object>) fut);

        GridDataLoadRequest<Object, Object> req =
            new GridDataLoadRequest<>(
                reqId,
                topicBytes,
                cacheName,
                updaterBytes,
                entriesBytes,
                true,
                dep != null ? dep.deployMode() : null,
                dep != null ? jobPda0.deployClass().getName() : null,
                dep != null ? dep.userVersion() : null,
                dep != null ? dep.participants() : null,
                dep != null ? dep.classLoaderId() : null,
                dep == null);

        try {
          ctx.io().send(node, TOPIC_DATALOAD, req, PUBLIC_POOL);

          if (log.isDebugEnabled())
            log.debug("Sent request to node [nodeId=" + node.id() + ", req=" + req + ']');
        } catch (GridException e) {
          if (ctx.discovery().alive(node) && ctx.discovery().pingNode(node.id()))
            ((GridFutureAdapter<Object>) fut).onDone(e);
          else
            ((GridFutureAdapter<Object>) fut)
                .onDone(
                    new GridTopologyException(
                        "Failed to send " + "request (node has left): " + node.id()));
        }
      }
    }
  /**
   * Performs flush.
   *
   * @throws GridException If failed.
   */
  private void doFlush() throws GridException {
    lastFlushTime = U.currentTimeMillis();

    List<GridFuture> activeFuts0 = null;

    int doneCnt = 0;

    for (GridFuture<?> f : activeFuts) {
      if (!f.isDone()) {
        if (activeFuts0 == null) activeFuts0 = new ArrayList<>((int) (activeFuts.size() * 1.2));

        activeFuts0.add(f);
      } else {
        f.get();

        doneCnt++;
      }
    }

    if (activeFuts0 == null || activeFuts0.isEmpty()) return;

    while (true) {
      Queue<GridFuture<?>> q = null;

      for (Buffer buf : bufMappings.values()) {
        GridFuture<?> flushFut = buf.flush();

        if (flushFut != null) {
          if (q == null) q = new ArrayDeque<>(bufMappings.size() * 2);

          q.add(flushFut);
        }
      }

      if (q != null) {
        assert !q.isEmpty();

        boolean err = false;

        for (GridFuture fut = q.poll(); fut != null; fut = q.poll()) {
          try {
            fut.get();
          } catch (GridException e) {
            if (log.isDebugEnabled()) log.debug("Failed to flush buffer: " + e);

            err = true;
          }
        }

        if (err)
          // Remaps needed - flush buffers.
          continue;
      }

      doneCnt = 0;

      for (int i = 0; i < activeFuts0.size(); i++) {
        GridFuture f = activeFuts0.get(i);

        if (f == null) doneCnt++;
        else if (f.isDone()) {
          f.get();

          doneCnt++;

          activeFuts0.set(i, null);
        } else break;
      }

      if (doneCnt == activeFuts0.size()) return;
    }
  }
 /**
  * @param f Future.
  * @return {@code True} if mini-future.
  */
 private boolean isMini(GridFuture<?> f) {
   return f.getClass().equals(MiniFuture.class);
 }
  /**
   * JUnit.
   *
   * @throws Exception In case of error.
   */
  @SuppressWarnings({"TooBroadScope"})
  public void testH2Text() throws Exception {
    int duration = 60 * 1000;
    final int keyCnt = 5000;
    final int logFreq = 50;
    final String txt = "Value";

    final GridCache<Integer, H2TextValue> c = grid(0).cache(null);

    GridFuture<?> fut1 =
        multithreadedAsync(
            new Callable() {
              @Override
              public Object call() throws Exception {
                for (int i = 0; i < keyCnt; i++) {
                  c.putx(i, new H2TextValue(txt));

                  if (i % logFreq == 0) X.println("Stored values: " + i);
                }

                return null;
              }
            },
            1);

    // Create query.
    final GridCacheQuery<Map.Entry<Integer, H2TextValue>> qry =
        c.queries().createFullTextQuery(H2TextValue.class, txt);

    qry.enableDedup(false);
    qry.includeBackups(false);
    qry.timeout(TEST_TIMEOUT);

    final AtomicBoolean stop = new AtomicBoolean();

    GridFuture<?> fut2 =
        multithreadedAsync(
            new Callable() {
              @Override
              public Object call() throws Exception {
                int cnt = 0;

                while (!stop.get()) {
                  Collection<Map.Entry<Integer, H2TextValue>> res = qry.execute().get();

                  cnt++;

                  if (cnt % logFreq == 0) {
                    X.println("Result set: " + res.size());
                    X.println("Executed queries: " + cnt);
                  }
                }

                return null;
              }
            },
            1);

    Thread.sleep(duration);

    fut1.get();

    stop.set(true);

    fut2.get();
  }