+/*
+ * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.databroker.actors.dds;
+
+import akka.util.Timeout;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.BiMap;
+import com.google.common.collect.ImmutableBiMap;
+import com.google.common.primitives.UnsignedLong;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.TimeUnit;
+import org.opendaylight.controller.cluster.access.ABIVersion;
+import org.opendaylight.controller.cluster.datastore.DataStoreVersions;
+import org.opendaylight.controller.cluster.datastore.actors.client.BackendInfo;
+import org.opendaylight.controller.cluster.datastore.actors.client.BackendInfoResolver;
+import org.opendaylight.controller.cluster.datastore.messages.PrimaryShardInfo;
+import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import scala.compat.java8.FutureConverters;
+
+/**
+ * {@link BackendInfoResolver} implementation for static shard configuration based on ShardManager. Each string-named
+ * shard is assigned a single cookie and this mapping is stored in a bidirectional map. Information about corresponding
+ * shard leader is resolved via {@link ActorContext}. The product of resolution is {@link ShardBackendInfo}.
+ *
+ * @author Robert Varga
+ */
+final class ModuleShardBackendResolver extends BackendInfoResolver<ShardBackendInfo> {
+ private static final Logger LOG = LoggerFactory.getLogger(ModuleShardBackendResolver.class);
+ /**
+ * Fall-over-dead timeout. If we do not make progress in this long, just fall over and propagate the failure.
+ * All users are expected to fail, possibly attempting to recover by restarting. It is fair to remain
+ * non-operational.
+ */
+ // TODO: maybe make this configurable somehow?
+ private static final Timeout DEAD_TIMEOUT = Timeout.apply(15, TimeUnit.MINUTES);
+
+ private final ActorContext actorContext;
+
+ private volatile BiMap<String, Long> shards = ImmutableBiMap.of();
+
+ // FIXME: we really need just ActorContext.findPrimaryShardAsync()
+ ModuleShardBackendResolver(final ActorContext actorContext) {
+ this.actorContext = Preconditions.checkNotNull(actorContext);
+ }
+
+ @Override
+ protected void invalidateBackendInfo(final CompletionStage<? extends BackendInfo> info) {
+ LOG.trace("Initiated invalidation of backend information {}", info);
+ info.thenAccept(this::invalidate);
+ }
+
+ private void invalidate(final BackendInfo result) {
+ Preconditions.checkArgument(result instanceof ShardBackendInfo);
+ LOG.debug("Invalidating backend information {}", result);
+ actorContext.getPrimaryShardInfoCache().remove(((ShardBackendInfo)result).getShardName());
+ }
+
+ @Override
+ protected CompletionStage<ShardBackendInfo> resolveBackendInfo(final Long cookie) {
+ final String shardName = shards.inverse().get(cookie);
+ if (shardName == null) {
+ LOG.warn("Failing request for non-existent cookie {}", cookie);
+ return CompletableFuture.completedFuture(null);
+ }
+
+ LOG.debug("Resolving cookie {} to shard {}", cookie, shardName);
+ return FutureConverters.toJava(actorContext.findPrimaryShardAsync(shardName))
+ .thenApply(o -> createBackendInfo(o, shardName, cookie));
+ }
+
+ private static ABIVersion toABIVersion(final short version) {
+ switch (version) {
+ case DataStoreVersions.BORON_VERSION:
+ return ABIVersion.BORON;
+ }
+
+ throw new IllegalArgumentException("Unsupported version " + version);
+ }
+
+ private static ShardBackendInfo createBackendInfo(final Object result, final String shardName, final Long cookie) {
+ Preconditions.checkArgument(result instanceof PrimaryShardInfo);
+ final PrimaryShardInfo info = (PrimaryShardInfo) result;
+
+ LOG.debug("Creating backend information for {}", info);
+ return new ShardBackendInfo(info.getPrimaryShardActor().resolveOne(DEAD_TIMEOUT).value().get().get(),
+ toABIVersion(info.getPrimaryShardVersion()), shardName, UnsignedLong.fromLongBits(cookie),
+ info.getLocalShardDataTree());
+ }
+}
Code Review / controller.git / commitdiff