X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-inmemory-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fmd%2Fsal%2Fdom%2Fstore%2Fimpl%2FResolveDataChangeState.java;h=828e4e30a18e12538ae1b36a76c13f1044a84755;hp=d3c5a7cb70e8013734f64619b456e74ed18ee0e2;hb=2c05037792ab14927d35ec913acd82c7c4fc0234;hpb=76b553837d30cd4c9d423251d9c4b9e218e53f6a

diff --git a/opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/ResolveDataChangeState.java b/opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/ResolveDataChangeState.java
index d3c5a7cb70..828e4e30a1 100644
--- a/opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/ResolveDataChangeState.java
+++ b/opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/ResolveDataChangeState.java
@@ -47,7 +47,7 @@ final class ResolveDataChangeState {
     /**
      * Inherited from immediate parent
      */
-    private final Iterable<Builder> inheritedOne;
+    private final Collection<Builder> inheritedOne;
     private final YangInstanceIdentifier nodeId;
     private final Collection<Node> nodes;
 
@@ -56,7 +56,7 @@ final class ResolveDataChangeState {
     private final Map<DataChangeListenerRegistration<?>, Builder> baseBuilders = new HashMap<>();
 
     private ResolveDataChangeState(final YangInstanceIdentifier nodeId,
-            final Iterable<Builder> inheritedSub, final Iterable<Builder> inheritedOne,
+            final Iterable<Builder> inheritedSub, final Collection<Builder> inheritedOne,
             final Collection<Node> nodes) {
         this.nodeId = Preconditions.checkNotNull(nodeId);
         this.nodes = Preconditions.checkNotNull(nodes);
@@ -103,8 +103,19 @@ final class ResolveDataChangeState {
      * @return State handle
      */
     public ResolveDataChangeState child(final PathArgument childId) {
-        return new ResolveDataChangeState(nodeId.node(childId),
-            Iterables.concat(inheritedSub, subBuilders.values()),
+        /*
+         * We instantiate a concatenation only when needed, otherwise
+         * we reuse the collection. This speeds up Iterables.isEmpty()
+         * in needsProcessing().
+         */
+        final Iterable<Builder> sb;
+        if (subBuilders.isEmpty()) {
+            sb = inheritedSub;
+        } else {
+            sb = Iterables.concat(inheritedSub, subBuilders.values());
+        }
+
+        return new ResolveDataChangeState(nodeId.node(childId), sb,
             oneBuilders.values(), getListenerChildrenWildcarded(nodes, childId));
     }
 
@@ -127,12 +138,12 @@ final class ResolveDataChangeState {
         if (!nodes.isEmpty()) {
             return true;
         }
-        // Have SUBTREE listeners
-        if (!Iterables.isEmpty(inheritedSub)) {
+        // Have ONE listeners
+        if (!inheritedOne.isEmpty()) {
             return true;
         }
-        // Have ONE listeners
-        if (!Iterables.isEmpty(inheritedOne)) {
+        // Have SUBTREE listeners
+        if (!Iterables.isEmpty(inheritedSub)) {
             return true;
         }