Update cache size on analysis start/stop.

pkg/analysis_server/lib/src/operation/operation_analysis.dart

 // Copyright (c) 2014, 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 operation.analysis;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/computer/computer_navigation.dart';
 import 'package:analysis_server/src/computer/computer_occurrences.dart';
@@ skipping 88 matching lines @@
   } catch (exception, stackTrace) {
     server.sendServerErrorNotification(exception, stackTrace);
   }
 }
 
 
 /**
  * Instances of [PerformAnalysisOperation] perform a single analysis task.
  */
 class PerformAnalysisOperation extends ServerOperation {
+  static const int IDLE_CACHE_SIZE = AnalysisOptionsImpl.DEFAULT_CACHE_SIZE;
+  static const int WORKING_CACHE_SIZE = 512;
+
   final AnalysisContext context;
   final bool isContinue;
 
   PerformAnalysisOperation(this.context, this.isContinue);
 
   @override
   ServerOperationPriority get priority {
     if (isContinue) {
       return ServerOperationPriority.ANALYSIS_CONTINUE;
     } else {
       return ServerOperationPriority.ANALYSIS;
     }
   }
 
   @override
   void perform(AnalysisServer server) {
     //
     // TODO(brianwilkerson) Add an optional function-valued parameter to
     // performAnalysisTask that will be called when the task has been computed
     // but before it is performed and send notification in the function:
     //
     // AnalysisResult result = context.performAnalysisTask((taskDescription) {
     //   sendStatusNotification(context.toString(), taskDescription);
     // });
+    if (!isContinue) {
+      _setCacheSize(WORKING_CACHE_SIZE);
+    }
     // prepare results
     AnalysisResult result = context.performAnalysisTask();
     List<ChangeNotice> notices = result.changeNotices;
     if (notices == null) {
+      _setCacheSize(IDLE_CACHE_SIZE);
       server.sendContextAnalysisDoneNotifications(
           context,
           AnalysisDoneReason.COMPLETE);
       return;
     }
     // process results
     sendNotices(server, notices);
     updateIndex(server, notices);
     // continue analysis
     server.addOperation(new PerformAnalysisOperation(context, true));
   }
 
+  void _setCacheSize(int cacheSize) {
+    AnalysisOptionsImpl options = new AnalysisOptionsImpl.con1(context.analysisOptions);
+    options.cacheSize = cacheSize;
+    context.analysisOptions = options;
+  }
+
   /**
    * Send the information in the given list of notices back to the client.
    */
   void sendNotices(AnalysisServer server, List<ChangeNotice> notices) {
     for (int i = 0; i < notices.length; i++) {
       ChangeNotice notice = notices[i];
       Source source = notice.source;
       String file = source.fullName;
       // Dart
       CompilationUnit dartUnit = notice.compilationUnit;
@@ skipping 56 matching lines @@
         HtmlUnit htmlUnit = notice.htmlUnit;
         if (htmlUnit != null) {
           index.indexHtmlUnit(context, htmlUnit);
         }
       } catch (exception, stackTrace) {
         server.sendServerErrorNotification(exception, stackTrace);
       }
     }
   }
 }