Bug 2264: Use streaming for snapshots

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / ShardReadTransaction.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardReadTransaction.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardReadTransaction.java
index be9c4d80e311484d0e6edea2050d85a0ebf28d1f..6f8d0567d9aa162d4080361162fe709decd544ce 100644 (file)
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardReadTransaction.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardReadTransaction.java
@@ -11,11 +11,21 @@
 package org.opendaylight.controller.cluster.datastore;
 
 import akka.actor.ActorRef;
+import akka.actor.PoisonPill;
+import com.google.common.base.Optional;
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
+import org.opendaylight.controller.cluster.datastore.messages.CreateSnapshot;
 import org.opendaylight.controller.cluster.datastore.messages.DataExists;
 import org.opendaylight.controller.cluster.datastore.messages.ReadData;
+import org.opendaylight.controller.cluster.datastore.utils.SerializationUtils;
+import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
 import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransaction;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
 
 /**
@@ -23,6 +33,8 @@ import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  * Date: 8/6/14
  */
 public class ShardReadTransaction extends ShardTransaction {
+    private static final YangInstanceIdentifier DATASTORE_ROOT = YangInstanceIdentifier.builder().build();
+
     private final DOMStoreReadTransaction transaction;
 
     public ShardReadTransaction(DOMStoreReadTransaction transaction, ActorRef shardActor,
@@ -39,7 +51,8 @@ public class ShardReadTransaction extends ShardTransaction {
 
         } else if (message instanceof DataExists) {
             dataExists(transaction, (DataExists) message, !SERIALIZED_REPLY);
-
+        } else if (message instanceof CreateSnapshot) {
+            createSnapshot();
         } else if(ReadData.SERIALIZABLE_CLASS.equals(message.getClass())) {
             readData(transaction, ReadData.fromSerializable(message), SERIALIZED_REPLY);
 
@@ -51,6 +64,34 @@ public class ShardReadTransaction extends ShardTransaction {
         }
     }
 
+    private void createSnapshot() {
+
+        // This is a special message sent by the shard to send back a serialized snapshot of the whole
+        // data store tree. This transaction was created for that purpose only so we can
+        // self-destruct after sending the reply.
+
+        final ActorRef sender = getSender();
+        final ActorRef self = getSelf();
+        final ListenableFuture<Optional<NormalizedNode<?, ?>>> future = transaction.read(DATASTORE_ROOT);
+
+        Futures.addCallback(future, new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
+            @Override
+            public void onSuccess(Optional<NormalizedNode<?, ?>> result) {
+                byte[] serialized = SerializationUtils.serializeNormalizedNode(result.get());
+                sender.tell(new CaptureSnapshotReply(serialized), self);
+
+                self.tell(PoisonPill.getInstance(), self);
+            }
+
+            @Override
+            public void onFailure(Throwable t) {
+                sender.tell(new akka.actor.Status.Failure(t), self);
+
+                self.tell(PoisonPill.getInstance(), self);
+            }
+        });
+    }
+
     @Override
     protected DOMStoreTransaction getDOMStoreTransaction() {
         return transaction;