Add placeholder maybePublishConfig

xds/src/main/java/io/grpc/xds/XdsDependencyManager.java

@@ -129,9 +129,15 @@ private void releaseSubscription(ClusterSubscription subscription) {
     if (subscriptions.isEmpty()) {
       clusterSubscriptions.remove(clusterName);
       // TODO release XdsClient watches for this cluster and its endpoint
+      maybePublishConfig();
     }
   }
 
+  private void maybePublishConfig() {
+    // Check if all resources have results and if so generate a new XdsConfig and send it to all
+    // the watchers
+  }
+
   @Override
   public String toString() {
     return logId.toString();
@@ -218,8 +224,8 @@ private LdsWatcher(String resourceName) {
 
     @Override
     public void onChanged(XdsListenerResource.LdsUpdate update) {
-       // TODO: process the update and add an RdsWatcher if needed
-       //  else see if we should publish a new XdsConfig
+      // TODO: process the update and add an RdsWatcher if needed
+      //   If none needed call maybePublishConfig()
     }
   }
 
@@ -232,7 +238,7 @@ public RdsWatcher(String resourceName) {
     @Override
     public void onChanged(RdsUpdate update) {
       // TODO: process the update and add CdsWatchers for all virtual hosts as needed
-      //  If none needed see if we should publish a new XdsConfig
+      //  If none needed call maybePublishConfig()
     }
   }
 
@@ -246,7 +252,7 @@ private CdsWatcher(String resourceName) {
     @Override
     public void onChanged(XdsClusterResource.CdsUpdate update) {
       // TODO: process the update and add an EdsWatcher if needed
-      //  else see if we should publish a new XdsConfig
+      //  else call maybePublishConfig()
     }
   }
 
@@ -257,7 +263,9 @@ private EdsWatcher(String resourceName) {
 
     @Override
     public void onChanged(XdsEndpointResource.EdsUpdate update) {
-      // TODO: process the update and see if we should publish a new XdsConfig
+      // TODO: process the update
+      maybePublishConfig();
+
     }
   }
 }