Avoid redundant calls to "pub list" when multiple dependencies change.

pkg/analysis_server/lib/src/analysis_server.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 analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:math' show max;
 
 import 'package:analysis_server/src/analysis_logger.dart';
 import 'package:analysis_server/src/channel/channel.dart';
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/operation/operation.dart';
 import 'package:analysis_server/src/operation/operation_analysis.dart';
 import 'package:analysis_server/src/operation/operation_queue.dart';
 import 'package:analysis_server/src/protocol.dart' hide Element;
 import 'package:analysis_server/src/services/correction/namespace.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
+import 'package:analysis_server/src/source/optimizing_pub_package_map_provider.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/plugin/plugin.dart';
-import 'package:analyzer/source/package_map_provider.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/generated/utilities_general.dart';
 
 typedef void OptionUpdater(AnalysisOptionsImpl options);
@@ skipping 207 matching lines @@
   /**
    * Initialize a newly created server to receive requests from and send
    * responses to the given [channel].
    *
    * If [rethrowExceptions] is true, then any exceptions thrown by analysis are
    * propagated up the call stack.  The default is true to allow analysis
    * exceptions to show up in unit tests, but it should be set to false when
    * running a full analysis server.
    */
   AnalysisServer(this.channel, this.resourceProvider,
-      PackageMapProvider packageMapProvider, Index _index,
+      OptimizingPubPackageMapProvider packageMapProvider, Index _index,
       AnalysisServerOptions analysisServerOptions, this.defaultSdk,
       this.instrumentationService, {this.rethrowExceptions: true})
       : index = _index,
         searchEngine = _index != null ? createSearchEngine(_index) : null {
     _performance = performanceDuringStartup;
     operationQueue = new ServerOperationQueue();
     contextDirectoryManager = new ServerContextManager(
         this, resourceProvider, packageMapProvider, instrumentationService);
     contextDirectoryManager.defaultOptions.incremental = true;
     contextDirectoryManager.defaultOptions.incrementalApi =
@@ skipping 891 matching lines @@
   }
 
   /**
    * Return a set of contexts containing all of the resources in the given list
    * of [resources].
    */
   Set<AnalysisContext> _getContexts(List<Resource> resources) {
     Set<AnalysisContext> contexts = new HashSet<AnalysisContext>();
     resources.forEach((Resource resource) {
       if (resource is Folder) {
-        contexts.addAll(contextDirectoryManager.contextsInAnalysisRoot(resource));
+        contexts
+            .addAll(contextDirectoryManager.contextsInAnalysisRoot(resource));
       }
     });
     return contexts;
   }
 
   /**
    * Returns the [CompilationUnit] of the Dart file with the given [source] that
    * should be used to resend notifications for already resolved unit.
    * Returns `null` if the file is not a part of any context, library has not
    * been yet resolved, or any problem happened.
@@ skipping 117 matching lines @@
    * The default options used to create new analysis contexts.
    */
   AnalysisOptionsImpl defaultOptions = new AnalysisOptionsImpl();
 
   /**
    * The controller for sending [ContextsChangedEvent]s.
    */
   StreamController<ContextsChangedEvent> _onContextsChangedController;
 
   ServerContextManager(this.analysisServer, ResourceProvider resourceProvider,
-      PackageMapProvider packageMapProvider, InstrumentationService service)
+      OptimizingPubPackageMapProvider packageMapProvider,
+      InstrumentationService service)
       : super(resourceProvider, packageMapProvider, service) {
     _onContextsChangedController =
         new StreamController<ContextsChangedEvent>.broadcast();
   }
 
   /**
    * The stream that is notified when contexts are added or removed.
    */
   Stream<ContextsChangedEvent> get onContextsChanged =>
       _onContextsChangedController.stream;
@@ skipping 184 matching lines @@
   /**
    * The [PerformanceTag] for time spent in server request handlers.
    */
   static PerformanceTag serverRequests = new PerformanceTag('serverRequests');
 
   /**
    * The [PerformanceTag] for time spent in split store microtasks.
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }