/**
   * {@inheritDoc}
   *
   * @param ctx
   */
  @Override
  public void prepareMarshal(GridCacheSharedContext ctx) throws IgniteCheckedException {
    super.prepareMarshal(ctx);

    GridCacheContext cctx = ctx.cacheContext(cacheId);

    prepareMarshalCacheObjects(keys, cctx);

    if (op == TRANSFORM) entryProcessorsBytes = marshalCollection(entryProcessors, ctx);
    else prepareMarshalCacheObjects(vals, cctx);

    if (filter != null) {
      boolean hasFilter = false;

      for (CacheEntryPredicate p : filter) {
        if (p != null) {
          hasFilter = true;

          p.prepareMarshal(cctx);
        }
      }

      if (!hasFilter) filter = null;
    }

    invokeArgsBytes = marshalInvokeArguments(invokeArgs, ctx);

    if (expiryPlc != null)
      expiryPlcBytes = CU.marshal(ctx, new IgniteExternalizableExpiryPolicy(expiryPlc));
  }
  /**
   * @param cctx Cache context.
   * @param prj Projection (optional).
   * @return Collection of data nodes in provided projection (if any).
   */
  private static Collection<ClusterNode> nodes(
      final GridCacheContext<?, ?> cctx,
      @Nullable final ClusterGroup prj,
      @Nullable final Integer part) {
    assert cctx != null;

    final AffinityTopologyVersion topVer = cctx.affinity().affinityTopologyVersion();

    Collection<ClusterNode> affNodes = CU.affinityNodes(cctx);

    if (prj == null && part == null) return affNodes;

    final Set<ClusterNode> owners =
        part == null
            ? Collections.<ClusterNode>emptySet()
            : new HashSet<>(cctx.topology().owners(part, topVer));

    return F.view(
        affNodes,
        new P1<ClusterNode>() {
          @Override
          public boolean apply(ClusterNode n) {

            return cctx.discovery().cacheAffinityNode(n, cctx.name())
                && (prj == null || prj.node(n.id()) != null)
                && (part == null || owners.contains(n));
          }
        });
  }