Flush results when contexts are made idle.

pkg/analyzer/lib/src/context/context.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.context.context;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 60 matching lines @@
    * The next context identifier.
    */
   static int _NEXT_ID = 0;
 
   /**
    * The unique identifier of this context.
    */
   final int _id = _NEXT_ID++;
 
   /**
+   * The flag that is `true` if the context is being analyzed.
+   */
+  bool _isActive = false;
+
+  /**
    * A client-provided name used to identify this context, or `null` if the
    * client has not provided a name.
    */
   @override
   String name;
 
   /**
    * The set of analysis options controlling the behavior of this context.
    */
   AnalysisOptionsImpl _options = new AnalysisOptionsImpl();
@@ skipping 299 matching lines @@
   }
 
   @override
   List<Source> get htmlSources => _getSources(SourceKind.HTML);
 
   @override
   Stream<ImplicitAnalysisEvent> get implicitAnalysisEvents =>
       _implicitAnalysisEventsController.stream;
 
   @override
+  bool get isActive => _isActive;
+
+  @override
+  set isActive(bool active) {
+    if (active != _isActive) {
+      _isActive = active;
+      _privatePartition.isActive = active;
+    }
+  }
+
+  @override
   bool get isDisposed => _disposed;
 
   @override
   List<Source> get launchableClientLibrarySources {
     List<Source> sources = <Source>[];
     for (Source source in _cache.sources) {
       CacheEntry entry = _cache.get(source);
       if (entry.getValue(SOURCE_KIND) == SourceKind.LIBRARY &&
           !source.isInSystemLibrary &&
           isClientLibrary(source)) {
@@ skipping 1888 matching lines @@
     }
     DartSdk sdk = factory.dartSdk;
     if (sdk == null) {
       throw new IllegalArgumentException(
           "The source factory for an SDK analysis context must have a DartUriResolver");
     }
     return new AnalysisCache(
         <CachePartition>[AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
   }
 }