Initial version of limiting invalidation.

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/instrumentation/instrumentation.dart';
@@ skipping 17 matching lines @@
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/sdk.dart' show DartSdk;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_collection.dart';
 import 'package:analyzer/src/task/dart.dart';
 import 'package:analyzer/src/task/dart_work_manager.dart';
 import 'package:analyzer/src/task/driver.dart';
 import 'package:analyzer/src/task/html.dart';
 import 'package:analyzer/src/task/html_work_manager.dart';
+import 'package:analyzer/src/task/incremental_element_builder.dart';
 import 'package:analyzer/src/task/manager.dart';
 import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/general.dart';
 import 'package:analyzer/task/html.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:html/dom.dart' show Document;
 
 /**
  * Type of callback functions used by PendingFuture. Functions of this type
  * should perform a computation based on the data in [entry] and return it. If
@@ skipping 1665 matching lines @@
         if (fileContents.data == sourceContent) {
           int time = fileContents.modificationTime;
           for (CacheEntry entry in _entriesFor(source)) {
             entry.modificationTime = time;
           }
           return;
         }
       } catch (e) {}
     }
     // We need to invalidate the cache.
-    entry.setState(CONTENT, CacheState.INVALID);
+    {
+      Object delta = null;
+      if (AnalysisEngine.instance.limitInvalidationInTaskModel &&
+          AnalysisEngine.isDartFileName(source.fullName)) {
+        // TODO(scheglov) Incorrect implementation in general.
+        entry.setState(TOKEN_STREAM, CacheState.FLUSHED);
+        entry.setState(SCAN_ERRORS, CacheState.FLUSHED);
+        entry.setState(PARSED_UNIT, CacheState.FLUSHED);
+        entry.setState(PARSE_ERRORS, CacheState.FLUSHED);
+        CompilationUnit oldUnit = getResolvedCompilationUnit2(source, source);
+        if (oldUnit != null) {
+          CompilationUnit newUnit = parseCompilationUnit(source);
+          IncrementalCompilationUnitElementBuilder builder =
+              new IncrementalCompilationUnitElementBuilder(oldUnit, newUnit);
+          builder.build();
+          CompilationUnitElementDelta unitDelta = builder.unitDelta;
+          DartDelta dartDelta = new DartDelta(source);
+          dartDelta.hasDirectiveChange = unitDelta.hasDirectiveChange;
+          unitDelta.addedDeclarations.forEach(dartDelta.elementAdded);
+          unitDelta.removedDeclarations.forEach(dartDelta.elementRemoved);
+          delta = dartDelta;
+        }
+      }
+      entry.setState(CONTENT, CacheState.INVALID, delta: delta);
+    }
     dartWorkManager.applyChange(
         Source.EMPTY_LIST, <Source>[source], Source.EMPTY_LIST);
     htmlWorkManager.applyChange(
         Source.EMPTY_LIST, <Source>[source], Source.EMPTY_LIST);
   }
 
   /**
    * Record that the give [source] has been deleted.
    */
   void _sourceDeleted(Source source) {
@@ skipping 29 matching lines @@
    */
   void _sourceRemoved(Source source) {
     _cache.remove(source);
     _removeFromPriorityOrder(source);
   }
 
   /**
    * TODO(scheglov) A hackish, limited incremental resolution implementation.
    */
   bool _tryPoorMansIncrementalResolution(Source unitSource, String newCode) {
+    if (AnalysisEngine.instance.limitInvalidationInTaskModel) {
+      return false;
+    }
     return PerformanceStatistics.incrementalAnalysis.makeCurrentWhile(() {
       incrementalResolutionValidation_lastUnitSource = null;
       incrementalResolutionValidation_lastLibrarySource = null;
       incrementalResolutionValidation_lastUnit = null;
       // prepare the entry
       CacheEntry sourceEntry = _cache.get(unitSource);
       if (sourceEntry == null) {
         return false;
       }
       // prepare the (only) library source
@@ skipping 232 matching lines @@
         new PendingFuture<T>(_context, target, computeValue);
     if (!pendingFuture.evaluate(entry)) {
       _context._pendingFutureTargets
           .putIfAbsent(target, () => <PendingFuture>[])
           .add(pendingFuture);
       scheduleComputation();
     }
     return pendingFuture.future;
   }
 }