Ensure that the schemas tree view handles indexing updates aka "entering/leaving Dumb mode" (#164)

Author: jimkyndemeyer

src/main/com/intellij/lang/jsgraphql/ide/project/schemastatus/GraphQLConfigSchemaNode.java

@@ -20,6 +20,7 @@
 import com.intellij.lang.jsgraphql.schema.GraphQLSchemaWithErrors;
 import com.intellij.lang.jsgraphql.schema.GraphQLTypeDefinitionRegistryServiceImpl;
 import com.intellij.openapi.fileEditor.ex.FileEditorManagerEx;
+import com.intellij.openapi.project.IndexNotReadyException;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.ui.SimpleTextAttributes;
@@ -159,9 +160,13 @@ public GraphQLConfigProjectsNode(GraphQLConfigSchemaNode parent) {
         @Override
         public SimpleNode[] getChildren() {
             if (parent.projectsConfigData != null) {
-                return parent.projectsConfigData.values().stream().map(config -> {
-                    return new GraphQLConfigSchemaNode(myProject, parent.configManager, config, parent.configBaseDir);
-                }).toArray(SimpleNode[]::new);
+                try {
+                    return parent.projectsConfigData.values().stream().map(config -> {
+                        return new GraphQLConfigSchemaNode(myProject, parent.configManager, config, parent.configBaseDir);
+                    }).toArray(SimpleNode[]::new);
+                } catch (IndexNotReadyException ignored) {
+                    // entered "dumb" mode, so just return no children as the tree view will be rebuilt as empty shortly (GraphQLSchemasRootNode)
+                }
             }
             return SimpleNode.NO_CHILDREN;
         }

src/main/com/intellij/lang/jsgraphql/ide/project/schemastatus/GraphQLSchemasPanel.java

@@ -17,6 +17,7 @@
 import com.intellij.openapi.fileEditor.FileEditorManager;
 import com.intellij.openapi.fileEditor.FileEditorManagerEvent;
 import com.intellij.openapi.fileEditor.FileEditorManagerListener;
+import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.project.DumbServiceImpl;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.util.Condition;
@@ -103,6 +104,19 @@ public boolean isPathSelected(TreePath treePath) {
         // Need indexing to be ready to build schema status
         DumbServiceImpl.getInstance(myProject).smartInvokeLater(myBuilder::initRootNode);
 
+        // update tree in response to indexing changes
+        connection.subscribe(DumbService.DUMB_MODE, new DumbService.DumbModeListener() {
+            @Override
+            public void enteredDumbMode() {
+                myBuilder.updateFromRoot(true);
+            }
+
+            @Override
+            public void exitDumbMode() {
+                myBuilder.updateFromRoot(true);
+            }
+        });
+
         final JBScrollPane scrollPane = new JBScrollPane(myTree);
         scrollPane.setBorder(IdeBorderFactory.createBorder(SideBorder.LEFT));
 

src/main/com/intellij/lang/jsgraphql/ide/project/schemastatus/GraphQLSchemasRootNode.java

@@ -11,6 +11,7 @@
 import com.intellij.ide.util.treeView.PresentableNodeDescriptor;
 import com.intellij.lang.jsgraphql.ide.project.graphqlconfig.GraphQLConfigManager;
 import com.intellij.lang.jsgraphql.ide.project.graphqlconfig.model.GraphQLConfigData;
+import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.project.IndexNotReadyException;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
@@ -38,6 +39,10 @@ public GraphQLSchemasRootNode(Project project) {
     @Override
     public SimpleNode[] getChildren() {
         try {
+            if (DumbService.getInstance(myProject).isDumb()) {
+                // empty the tree view during indexing
+                return SimpleNode.NO_CHILDREN;
+            }
             final List<SimpleNode> children = Lists.newArrayList();
             for (Map.Entry<VirtualFile, GraphQLConfigData> entry : configManager.getConfigurationsByPath().entrySet()) {
                 children.add(new GraphQLConfigSchemaNode(myProject, configManager, entry.getValue(), entry.getKey()));