Support refresh of individual analysis roots (issue 22254)

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 bad954c6c7ac1dccaaf732881d9474235c815967..906429badf7959cf1cdd4ad5c28d632040f904a8 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -733,14 +733,21 @@ class AnalysisServer {
   }
 
   /**
-   * Trigger reanalysis of all files from disk.
+   * Trigger reanalysis of all files in the given list of analysis [roots], or
+   * everything if the analysis roots is `null`.
    */
-  void reanalyze() {
+  void reanalyze(List<Resource> roots) {
     // Clear any operations that are pending.
-    operationQueue.clear();
+    if (roots == null) {
+      operationQueue.clear();
+    } else {
+      for (AnalysisContext context in _getContexts(roots)) {
+        operationQueue.contextRemoved(context);
+      }
+    }
     // Instruct the contextDirectoryManager to rebuild all contexts from
     // scratch.
-    contextDirectoryManager.refresh();
+    contextDirectoryManager.refresh(roots);
   }
 
   /**
@@ -1096,6 +1103,21 @@ class AnalysisServer {
   }
 
   /**
+   * 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) {
+      AnalysisContext context = getContainingContext(resource.path);

[scheglov, 2015/03/30 20:38:07]

There might be more that one context in a root.
I expected to see here something like the code you added into
context_manager.dart to find the contexts containing in a root.

[Brian Wilkerson, 2015/03/30 21:01:25]

Yes, of course. I was thinking backward.

+      if (context != null) {
+        contexts.add(context);
+      }
+    });
+    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