X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2FShardManager.java;h=0363b3ceb370772ca617bb50abcddef95ed7da5e;hb=516a4b2ea78179c9bd6ebb584862e8fc686ebf08;hp=63266d6308287d2e816724f3f73b192b0d120bce;hpb=81bbe76bd26399118d028663d08e464ce6b7d040;p=controller.git

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java
index 63266d6308..0363b3ceb3 100644
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java
@@ -8,12 +8,21 @@
 
 package org.opendaylight.controller.cluster.datastore;
 
+import akka.actor.ActorPath;
+import akka.actor.ActorRef;
 import akka.actor.Address;
-import akka.actor.UntypedActor;
-import akka.event.Logging;
-import akka.event.LoggingAdapter;
+import akka.actor.OneForOneStrategy;
+import akka.actor.Props;
+import akka.actor.SupervisorStrategy;
+import akka.cluster.ClusterEvent;
+import akka.japi.Creator;
+import akka.japi.Function;
+import com.google.common.base.Preconditions;
 import org.opendaylight.controller.cluster.datastore.messages.FindPrimary;
+import org.opendaylight.controller.cluster.datastore.messages.PrimaryFound;
 import org.opendaylight.controller.cluster.datastore.messages.PrimaryNotFound;
+import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
+import scala.concurrent.duration.Duration;
 
 import java.util.HashMap;
 import java.util.List;
@@ -21,41 +30,178 @@ import java.util.Map;
 
 /**
  * The ShardManager has the following jobs,
- *
- *  - Create all the local shard replicas that belong on this cluster member
- *  - Find the primary replica for any given shard
- *  - Engage in shard replica elections which decide which replica should be the primary
- *
- * Creation of Shard replicas
- * ==========================
- *  When the ShardManager is constructed it reads the cluster configuration to find out which shard replicas
- *  belong on this member. It finds out the name of the current cluster member from the Akka Clustering Service.
- *
- * Replica Elections
- * =================
- *  The Shard Manager uses multiple cues to initiate election.
- *      - When a member of the cluster dies
- *      - When a local shard replica dies
- *      - When a local shard replica comes alive
+ * <p>
+ * <li> Create all the local shard replicas that belong on this cluster member
+ * <li> Find the primary replica for any given shard
+ * <li> Engage in shard replica elections which decide which replica should be the primary
+ * </p>
+ * <p/>
+ * <h3>>Creation of Shard replicas</h3
+ * <p>
+ * When the ShardManager is constructed it reads the cluster configuration to find out which shard replicas
+ * belong on this member. It finds out the name of the current cluster member from the Akka Clustering Service.
+ * </p>
+ * <p/>
+ * <h3> Replica Elections </h3>
+ * <p/>
+ * <p>
+ * The Shard Manager uses multiple cues to initiate election.
+ * <li> When a member of the cluster dies
+ * <li> When a local shard replica dies
+ * <li> When a local shard replica comes alive
+ * </p>
  */
-public class ShardManager extends UntypedActor {
-
-    // Stores a mapping between a shard name and the address of the current primary
-    private final Map<String, Address> shardNameToPrimaryAddress = new HashMap<>();
+public class ShardManager extends AbstractUntypedActor {
 
     // Stores a mapping between a member name and the address of the member
     private final Map<String, Address> memberNameToAddress = new HashMap<>();
 
-    // Stores a mapping between the shard name and all the members on which a replica of that shard are available
-    private final Map<String, List<String>> shardNameToMembers = new HashMap<>();
+    private final Map<String, ActorPath> localShards = new HashMap<>();
+
+
+    private final String type;
+
+    private final ClusterWrapper cluster;
+
+    private final Configuration configuration;
+
+    /**
+     * @param type defines the kind of data that goes into shards created by this shard manager. Examples of type would be
+     *             configuration or operational
+     */
+    private ShardManager(String type, ClusterWrapper cluster, Configuration configuration) {
+
+        this.type = Preconditions.checkNotNull(type, "type should not be null");
+        this.cluster = Preconditions.checkNotNull(cluster, "cluster should not be null");
+        this.configuration = Preconditions.checkNotNull(configuration, "configuration should not be null");
+
+        // Subscribe this actor to cluster member events
+        cluster.subscribeToMemberEvents(getSelf());
+
+        // Create all the local Shards and make them a child of the ShardManager
+        // TODO: This may need to be initiated when we first get the schema context
+        createLocalShards();
+    }
+
+    public static Props props(final String type,
+        final ClusterWrapper cluster,
+        final Configuration configuration) {
+        return Props.create(new Creator<ShardManager>() {
+
+            @Override
+            public ShardManager create() throws Exception {
+                return new ShardManager(type, cluster, configuration);
+            }
+        });
+    }
 
-    LoggingAdapter log = Logging.getLogger(getContext().system(), this);
 
     @Override
-    public void onReceive(Object message) throws Exception {
-        if(message instanceof FindPrimary ){
-            FindPrimary msg = ((FindPrimary) message);
-            getSender().tell(new PrimaryNotFound(msg.getShardName()), getSelf());
+    public void handleReceive(Object message) throws Exception {
+        if (message.getClass().equals(FindPrimary.SERIALIZABLE_CLASS)) {
+            findPrimary(
+                FindPrimary.fromSerializable(message));
+
+        } else if (message instanceof UpdateSchemaContext) {
+            updateSchemaContext(message);
+        } else if (message instanceof ClusterEvent.MemberUp){
+            memberUp((ClusterEvent.MemberUp) message);
+        } else if(message instanceof ClusterEvent.MemberRemoved) {
+            memberRemoved((ClusterEvent.MemberRemoved) message);
+        } else if(message instanceof ClusterEvent.UnreachableMember) {
+            ignoreMessage(message);
+        } else{
+          throw new Exception ("Not recognized message received, message="+message);
         }
+
+    }
+
+    private void ignoreMessage(Object message){
+        LOG.debug("Unhandled message : " + message);
+    }
+
+    private void memberRemoved(ClusterEvent.MemberRemoved message) {
+        memberNameToAddress.remove(message.member().roles().head());
+    }
+
+    private void memberUp(ClusterEvent.MemberUp message) {
+        memberNameToAddress.put(message.member().roles().head(), message.member().address());
+    }
+
+    private void updateSchemaContext(Object message) {
+        for(ActorPath path : localShards.values()){
+            getContext().system().actorSelection(path)
+                .forward(message,
+                    getContext());
+        }
+    }
+
+    private void findPrimary(FindPrimary message) {
+        String shardName = message.getShardName();
+
+        List<String> members =
+            configuration.getMembersFromShardName(shardName);
+
+        for(String memberName : members) {
+            if (memberName.equals(cluster.getCurrentMemberName())) {
+                // This is a local shard
+                ActorPath shardPath = localShards.get(shardName);
+                if (shardPath == null) {
+                    getSender()
+                        .tell(new PrimaryNotFound(shardName).toSerializable(), getSelf());
+                    return;
+                }
+                getSender().tell(new PrimaryFound(shardPath.toString()).toSerializable(),
+                    getSelf());
+                return;
+            } else {
+                Address address = memberNameToAddress.get(memberName);
+                if(address != null){
+                    String path =
+                        address.toString() + "/user/shardmanager-" + this.type + "/" + getShardActorName(
+                            memberName, shardName);
+                    getSender().tell(new PrimaryFound(path).toSerializable(), getSelf());
+                    return;
+                }
+
+
+            }
+        }
+
+        getSender().tell(new PrimaryNotFound(shardName).toSerializable(), getSelf());
+    }
+
+    private String getShardActorName(String memberName, String shardName){
+        return memberName + "-shard-" + shardName + "-" + this.type;
+    }
+
+    // Create the shards that are local to this member
+    private void createLocalShards() {
+        String memberName = this.cluster.getCurrentMemberName();
+        List<String> memberShardNames =
+            this.configuration.getMemberShardNames(memberName);
+
+        for(String shardName : memberShardNames){
+            String shardActorName = getShardActorName(memberName, shardName);
+            ActorRef actor = getContext()
+                .actorOf(Shard.props(shardActorName), shardActorName);
+            ActorPath path = actor.path();
+            localShards.put(shardName, path);
+        }
+
+    }
+
+
+    @Override
+    public SupervisorStrategy supervisorStrategy() {
+        return new OneForOneStrategy(10, Duration.create("1 minute"),
+            new Function<Throwable, SupervisorStrategy.Directive>() {
+                @Override
+                public SupervisorStrategy.Directive apply(Throwable t) {
+                    return SupervisorStrategy.resume();
+                }
+            }
+        );
+
     }
 }