add server.status notification

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index 7ebd6c680fc2cfde806d6178e3a0591fd9f4b63d..d167ba4ebfdeb630512b4ff9808ff65049ebea19 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -12,6 +12,7 @@ import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_core.dart';
+import 'package:analyzer/src/generated/source.dart';
 
 /**
  * Instances of the class [AnalysisServer] implement a server that listens on a
@@ -44,6 +45,11 @@ class AnalysisServer {
   static const String CONNECTED_NOTIFICATION = 'server.connected';
 
   /**
+   * The event name of the status notification.
+   */
+  static const String STATUS_NOTIFICATION = 'server.status';
+
+  /**
    * The channel from which requests are received and to which responses should
    * be sent.
    */
@@ -73,6 +79,11 @@ class AnalysisServer {
   final Map<AnalysisContext, String> contextIdMap = new Map<AnalysisContext, String>();
 
   /**
+   * The context identifier used in the last status notification.
+   */
+  String lastStatusNotificationContextId = null;
+
+  /**
    * A list of the analysis contexts for which analysis work needs to be
    * performed.
    *
@@ -195,7 +206,10 @@ class AnalysisServer {
       }
     }
     if (notices != null) {
+      sendStatusNotification(contextId);
       sendNotices(contextId, notices);
+    } else {
+      sendStatusNotification(null);
     }
   }
 
@@ -214,6 +228,28 @@ class AnalysisServer {
     }
   }
 
+  /**
+   * Send status notification to the client. The `contextId` indicates
+   * the current context being analyzed or `null` if analysis is complete.
+   */
+  void sendStatusNotification(String contextId) {
+    if (contextId == lastStatusNotificationContextId) {
+      return;
+    }
+    lastStatusNotificationContextId = contextId;
+    Notification notification = new Notification(STATUS_NOTIFICATION);
+    Map<String, Object> analysis = new Map();
+    if (contextId != null) {
+      analysis['analyzing'] = true;
+      // TODO(danrubel): replace contextId with real analysisTarget
+      analysis['analysisTarget'] = contextId;
+    } else {
+      analysis['analyzing'] = false;
+    }
+    notification.params['analysis'] = analysis;
+    channel.sendNotification(notification);
+  }
+
   static Map<String, Object> errorToJson(AnalysisError analysisError) {
     // TODO(paulberry): move this function into the AnalysisError class.