2 * Copyright (c) 2022 PANTHEON.tech, s.r.o. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.cluster.datastore.utils;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Verify.verifyNotNull;
12 import static java.util.Objects.requireNonNull;
14 import com.google.common.base.MoreObjects;
15 import com.google.common.collect.ImmutableList;
16 import com.google.common.util.concurrent.FluentFuture;
17 import com.google.common.util.concurrent.Futures;
18 import com.google.common.util.concurrent.MoreExecutors;
19 import java.util.HashMap;
21 import java.util.Optional;
22 import java.util.function.Function;
23 import java.util.stream.Collectors;
24 import java.util.stream.Stream;
25 import org.eclipse.jdt.annotation.NonNull;
26 import org.eclipse.jdt.annotation.NonNullByDefault;
27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
30 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
31 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
32 import org.opendaylight.yangtools.yang.data.spi.node.ImmutableNodes;
33 import org.opendaylight.yangtools.yang.data.tree.api.DataValidationFailedException;
36 * Utility methods for dealing with datastore root {@link ContainerNode} with respect to module shards.
38 public final class RootScatterGather {
40 public record ShardContainer<T>(T shard, ContainerNode container) {
41 public ShardContainer {
42 requireNonNull(shard);
43 requireNonNull(container);
47 public String toString() {
48 return MoreObjects.toStringHelper(this).add("shard", shard).toString();
52 private RootScatterGather() {
57 * Check whether a {@link NormalizedNode} represents a root container and return it cast to {@link ContainerNode}.
59 * @param node a normalized node
60 * @return {@code node} cast to ContainerNode
61 * @throws NullPointerException if {@code node} is null
62 * @throws IllegalArgumentException if {@code node} is not a {@link ContainerNode}
64 public static @NonNull ContainerNode castRootNode(final NormalizedNode node) {
65 final var nonnull = requireNonNull(node);
66 checkArgument(nonnull instanceof ContainerNode, "Invalid root data %s", nonnull);
67 return (ContainerNode) nonnull;
71 * Reconstruct root container from a set of constituents.
73 * @param actorUtils {@link ActorUtils} reference
74 * @param readFutures Consitutent read futures
75 * @return A composite future
77 public static @NonNull FluentFuture<Optional<NormalizedNode>> gather(final ActorUtils actorUtils,
78 final Stream<FluentFuture<Optional<NormalizedNode>>> readFutures) {
79 return FluentFuture.from(Futures.transform(
80 Futures.allAsList(readFutures.collect(ImmutableList.toImmutableList())), input -> {
82 return NormalizedNodeAggregator.aggregate(YangInstanceIdentifier.of(), input,
83 actorUtils.getSchemaContext(), actorUtils.getDatastoreContext().getLogicalStoreType());
84 } catch (DataValidationFailedException e) {
85 throw new IllegalArgumentException("Failed to aggregate", e);
87 }, MoreExecutors.directExecutor()));
90 public static <T> @NonNull Stream<ShardContainer<T>> scatterAll(final ContainerNode rootNode,
91 final Function<PathArgument, T> childToShard, final Stream<T> allShards) {
92 final var builders = allShards
93 .collect(Collectors.toUnmodifiableMap(Function.identity(), unused -> ImmutableNodes.newContainerBuilder()));
94 for (var child : rootNode.body()) {
95 final var shard = childToShard.apply(child.name());
96 verifyNotNull(builders.get(shard), "Failed to find builder for %s", shard).addChild(child);
98 return streamContainers(rootNode.name(), builders);
102 * Split root container into per-shard root containers.
104 * @param <T> Shard reference type
105 * @param rootNode Root container to be split up
106 * @param childToShard Mapping function from child {@link PathArgument} to shard reference
107 * @return Stream of {@link ShardContainer}s, one for each touched shard
109 public static <T> @NonNull Stream<ShardContainer<T>> scatterTouched(final ContainerNode rootNode,
110 final Function<PathArgument, T> childToShard) {
111 final var builders = new HashMap<T, ContainerNode.Builder>();
112 for (var child : rootNode.body()) {
113 builders.computeIfAbsent(childToShard.apply(child.name()), unused -> ImmutableNodes.newContainerBuilder())
116 return streamContainers(rootNode.name(), builders);
119 private static <T> @NonNull Stream<ShardContainer<T>> streamContainers(final NodeIdentifier rootId,
120 final Map<T, ContainerNode.Builder> builders) {
121 return builders.entrySet().stream()
122 .map(entry -> new ShardContainer<>(entry.getKey(), entry.getValue().withNodeIdentifier(rootId).build()));