+/*
+ * Copyright (c) 2014 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.datastore.utils;
+
+import akka.actor.ActorPath;
+import akka.actor.ActorRef;
+import akka.actor.ActorSelection;
+import akka.actor.ActorSystem;
+import akka.util.Timeout;
+import org.opendaylight.controller.cluster.datastore.messages.FindPrimary;
+import org.opendaylight.controller.cluster.datastore.messages.PrimaryFound;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import scala.concurrent.Await;
+import scala.concurrent.Future;
+import scala.concurrent.duration.Duration;
+import scala.concurrent.duration.FiniteDuration;
+
+import java.util.concurrent.TimeUnit;
+
+import static akka.pattern.Patterns.ask;
+
+/**
+ * The ActorContext class contains utility methods which could be used by
+ * non-actors (like DistributedDataStore) to work with actors a little more
+ * easily. An ActorContext can be freely passed around to local object instances
+ * but should not be passed to actors especially remote actors
+ */
+public class ActorContext {
+ private static final Logger
+ LOG = LoggerFactory.getLogger(ActorContext.class);
+
+ public static final FiniteDuration ASK_DURATION = Duration.create(5, TimeUnit.SECONDS);
+ public static final Duration AWAIT_DURATION = Duration.create(5, TimeUnit.SECONDS);
+
+ private final ActorSystem actorSystem;
+ private final ActorRef shardManager;
+
+ public ActorContext(ActorSystem actorSystem, ActorRef shardManager){
+ this.actorSystem = actorSystem;
+ this.shardManager = shardManager;
+ }
+
+ public ActorSystem getActorSystem() {
+ return actorSystem;
+ }
+
+ public ActorRef getShardManager() {
+ return shardManager;
+ }
+
+ public ActorSelection actorSelection(String actorPath){
+ return actorSystem.actorSelection(actorPath);
+ }
+
+ public ActorSelection actorSelection(ActorPath actorPath){
+ return actorSystem.actorSelection(actorPath);
+ }
+
+
+ /**
+ * Finds the primary for a given shard
+ *
+ * @param shardName
+ * @return
+ */
+ public ActorSelection findPrimary(String shardName) {
+ Object result = executeLocalOperation(shardManager,
+ new FindPrimary(shardName), ASK_DURATION);
+
+ if(result instanceof PrimaryFound){
+ PrimaryFound found = (PrimaryFound) result;
+
+ LOG.error("Primary found {}", found.getPrimaryPath());
+
+ return actorSystem.actorSelection(found.getPrimaryPath());
+ }
+ throw new RuntimeException("primary was not found");
+ }
+
+ /**
+ * Executes an operation on a local actor and wait for it's response
+ * @param actor
+ * @param message
+ * @param duration
+ * @return The response of the operation
+ */
+ public Object executeLocalOperation(ActorRef actor, Object message,
+ FiniteDuration duration){
+ Future<Object> future =
+ ask(actor, message, new Timeout(duration));
+
+ try {
+ return Await.result(future, AWAIT_DURATION);
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ /**
+ * Execute an operation on a remote actor and wait for it's response
+ * @param actor
+ * @param message
+ * @param duration
+ * @return
+ */
+ public Object executeRemoteOperation(ActorSelection actor, Object message,
+ FiniteDuration duration){
+ Future<Object> future =
+ ask(actor, message, new Timeout(duration));
+
+ try {
+ return Await.result(future, AWAIT_DURATION);
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ /**
+ * Execute an operation on the primary for a given shard
+ * <p>
+ * This method first finds the primary for a given shard ,then sends
+ * the message to the remote shard and waits for a response
+ * </p>
+ * @param shardName
+ * @param message
+ * @param duration
+ * @throws java.lang.RuntimeException when a primary is not found or if the message to the remote shard fails or times out
+ *
+ * @return
+ */
+ public Object executeShardOperation(String shardName, Object message, FiniteDuration duration){
+ ActorSelection primary = findPrimary(shardName);
+
+ return executeRemoteOperation(primary, message, duration);
+ }
+
+}
Code Review / controller.git / commitdiff