Implement scatter/gather on module shards

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / databroker / actors / dds / ClientSnapshot.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/ClientSnapshot.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/ClientSnapshot.java
index d20a618c3df0c2d97feb8fbf951d6168a00cd5cb..5ba842aae3635fc6514c0a12b5dd59efd61fcbb3 100644 (file)
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/ClientSnapshot.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/ClientSnapshot.java
@@ -11,6 +11,7 @@ import com.google.common.annotations.Beta;
 import com.google.common.util.concurrent.FluentFuture;
 import java.util.Optional;
 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
+import org.opendaylight.controller.cluster.datastore.utils.RootScatterGather;
 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
 
@@ -28,19 +29,20 @@ public class ClientSnapshot extends AbstractClientHandle<AbstractProxyTransactio
     }
 
     public FluentFuture<Boolean> exists(final YangInstanceIdentifier path) {
-        return ensureSnapshotProxy(path).exists(path);
+        return ensureProxy(path).exists(path);
     }
 
     public FluentFuture<Optional<NormalizedNode>> read(final YangInstanceIdentifier path) {
-        return ensureSnapshotProxy(path).read(path);
+        return path.isEmpty() ? readRoot() : ensureProxy(path).read(path);
+    }
+
+    private FluentFuture<Optional<NormalizedNode>> readRoot() {
+        return RootScatterGather.gather(parent().actorUtils(), ensureAllProxies()
+            .map(proxy -> proxy.read(YangInstanceIdentifier.empty())));
     }
 
     @Override
     final AbstractProxyTransaction createProxy(final Long shard) {
         return parent().createSnapshotProxy(getIdentifier(), shard);
     }
-
-    private AbstractProxyTransaction ensureSnapshotProxy(final YangInstanceIdentifier path) {
-        return ensureProxy(path);
-    }
 }