2 * Copyright (c) 2016 Cisco Systems, Inc. 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.databroker.actors.dds;
10 import akka.actor.ActorRef;
11 import akka.util.Timeout;
12 import com.google.common.base.Preconditions;
13 import com.google.common.base.Throwables;
14 import com.google.common.collect.BiMap;
15 import com.google.common.collect.ImmutableBiMap;
16 import com.google.common.collect.ImmutableBiMap.Builder;
17 import com.google.common.primitives.UnsignedLong;
18 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
19 import java.util.concurrent.CompletableFuture;
20 import java.util.concurrent.CompletionStage;
21 import java.util.concurrent.TimeUnit;
22 import java.util.concurrent.atomic.AtomicLong;
23 import javax.annotation.concurrent.GuardedBy;
24 import org.opendaylight.controller.cluster.access.ABIVersion;
25 import org.opendaylight.controller.cluster.access.client.BackendInfo;
26 import org.opendaylight.controller.cluster.access.client.BackendInfoResolver;
27 import org.opendaylight.controller.cluster.access.commands.ConnectClientRequest;
28 import org.opendaylight.controller.cluster.access.commands.ConnectClientSuccess;
29 import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
30 import org.opendaylight.controller.cluster.access.concepts.RequestFailure;
31 import org.opendaylight.controller.cluster.common.actor.ExplicitAsk;
32 import org.opendaylight.controller.cluster.datastore.shardstrategy.DefaultShardStrategy;
33 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
34 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
35 import org.slf4j.Logger;
36 import org.slf4j.LoggerFactory;
37 import scala.Function1;
38 import scala.compat.java8.FutureConverters;
41 * {@link BackendInfoResolver} implementation for static shard configuration based on ShardManager. Each string-named
42 * shard is assigned a single cookie and this mapping is stored in a bidirectional map. Information about corresponding
43 * shard leader is resolved via {@link ActorContext}. The product of resolution is {@link ShardBackendInfo}.
45 * @author Robert Varga
47 @SuppressFBWarnings(value = "NP_NONNULL_PARAM_VIOLATION",
48 justification = "Pertains to the NULL_FUTURE field below. Null is allowed and is intended")
49 final class ModuleShardBackendResolver extends BackendInfoResolver<ShardBackendInfo> {
50 private static final CompletableFuture<ShardBackendInfo> NULL_FUTURE = CompletableFuture.completedFuture(null);
51 private static final Logger LOG = LoggerFactory.getLogger(ModuleShardBackendResolver.class);
54 * Fall-over-dead timeout. If we do not make progress in this long, just fall over and propagate the failure.
55 * All users are expected to fail, possibly attempting to recover by restarting. It is fair to remain
58 // TODO: maybe make this configurable somehow?
59 private static final Timeout DEAD_TIMEOUT = Timeout.apply(15, TimeUnit.MINUTES);
61 private final ActorContext actorContext;
62 // FIXME: this counter should be in superclass somewhere
63 private final AtomicLong nextSessionId = new AtomicLong();
64 private final Function1<ActorRef, ?> connectFunction;
67 private long nextShard = 1;
69 private volatile BiMap<String, Long> shards = ImmutableBiMap.of(DefaultShardStrategy.DEFAULT_SHARD, 0L);
71 // FIXME: we really need just ActorContext.findPrimaryShardAsync()
72 ModuleShardBackendResolver(final ClientIdentifier clientId, final ActorContext actorContext) {
73 this.actorContext = Preconditions.checkNotNull(actorContext);
74 this.connectFunction = ExplicitAsk.toScala(t -> new ConnectClientRequest(clientId, t, ABIVersion.BORON,
75 ABIVersion.current()));
79 protected void invalidateBackendInfo(final CompletionStage<? extends BackendInfo> info) {
80 LOG.trace("Initiated invalidation of backend information {}", info);
81 info.thenAccept(this::invalidate);
84 private void invalidate(final BackendInfo result) {
85 Preconditions.checkArgument(result instanceof ShardBackendInfo);
86 LOG.debug("Invalidating backend information {}", result);
87 actorContext.getPrimaryShardInfoCache().remove(((ShardBackendInfo)result).getShardName());
90 Long resolveShardForPath(final YangInstanceIdentifier path) {
91 final String shardName = actorContext.getShardStrategyFactory().getStrategy(path).findShard(path);
92 Long cookie = shards.get(shardName);
95 cookie = shards.get(shardName);
99 Builder<String, Long> builder = ImmutableBiMap.builder();
100 builder.putAll(shards);
101 builder.put(shardName, cookie);
102 shards = builder.build();
111 protected CompletableFuture<ShardBackendInfo> resolveBackendInfo(final Long cookie) {
112 final String shardName = shards.inverse().get(cookie);
113 if (shardName == null) {
114 LOG.warn("Failing request for non-existent cookie {}", cookie);
118 final CompletableFuture<ShardBackendInfo> ret = new CompletableFuture<>();
120 FutureConverters.toJava(actorContext.findPrimaryShardAsync(shardName)).thenCompose(info -> {
121 LOG.debug("Looking up primary info for {} from {}", shardName, info);
122 return FutureConverters.toJava(ExplicitAsk.ask(info.getPrimaryShardActor(), connectFunction, DEAD_TIMEOUT));
123 }).thenApply(response -> {
124 if (response instanceof RequestFailure) {
125 final RequestFailure<?, ?> failure = (RequestFailure<?, ?>) response;
126 LOG.debug("Connect request failed {}", failure, failure.getCause());
127 throw Throwables.propagate(failure.getCause());
130 LOG.debug("Resolved backend information to {}", response);
132 Preconditions.checkArgument(response instanceof ConnectClientSuccess, "Unhandled response {}", response);
133 final ConnectClientSuccess success = (ConnectClientSuccess) response;
135 return new ShardBackendInfo(success.getBackend(),
136 nextSessionId.getAndIncrement(), success.getVersion(), shardName, UnsignedLong.fromLongBits(cookie),
137 success.getDataTree(), success.getMaxMessages());
138 }).whenComplete((info, throwablw) -> {
139 if (throwablw != null) {
140 ret.completeExceptionally(throwablw);
146 LOG.debug("Resolving cookie {} to shard {}", cookie, shardName);