Update from Google.
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MOE_MIGRATED_REVID=85702957
diff --git a/src/main/java/com/google/devtools/build/skyframe/EagerInvalidator.java b/src/main/java/com/google/devtools/build/skyframe/EagerInvalidator.java
new file mode 100644
index 0000000..fc2a2c7
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/skyframe/EagerInvalidator.java
@@ -0,0 +1,85 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.skyframe;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.devtools.build.skyframe.InvalidatingNodeVisitor.DeletingNodeVisitor;
+import com.google.devtools.build.skyframe.InvalidatingNodeVisitor.DirtyingNodeVisitor;
+import com.google.devtools.build.skyframe.InvalidatingNodeVisitor.InvalidationState;
+
+/**
+ * Utility class for performing eager invalidation on Skyframe graphs.
+ *
+ * <p>This is intended only for use in alternative {@code MemoizingEvaluator} implementations.
+ */
+public final class EagerInvalidator {
+
+ private EagerInvalidator() {}
+
+ /**
+ * Deletes given values. The {@code traverseGraph} parameter controls whether this method deletes
+ * (transitive) dependents of these nodes and relevant graph edges, or just the nodes themselves.
+ * Deleting just the nodes is inconsistent unless the graph will not be used for incremental
+ * builds in the future, but unfortunately there is a case where we delete nodes intra-build. As
+ * long as the full upward transitive closure of the nodes is specified for deletion, the graph
+ * remains consistent.
+ */
+ public static void delete(DirtiableGraph graph, Iterable<SkyKey> diff,
+ EvaluationProgressReceiver invalidationReceiver, InvalidationState state,
+ boolean traverseGraph, DirtyKeyTracker dirtyKeyTracker) throws InterruptedException {
+ InvalidatingNodeVisitor visitor =
+ createVisitor(/*delete=*/true, graph, diff, invalidationReceiver, state, traverseGraph,
+ dirtyKeyTracker);
+ if (visitor != null) {
+ visitor.run();
+ }
+ }
+
+ /**
+ * Creates an invalidation visitor that is ready to run. Caller should call #run() on the visitor.
+ * Allows test classes to keep a reference to the visitor, and await exceptions/interrupts.
+ */
+ @VisibleForTesting
+ static InvalidatingNodeVisitor createVisitor(boolean delete, DirtiableGraph graph,
+ Iterable<SkyKey> diff, EvaluationProgressReceiver invalidationReceiver,
+ InvalidationState state, boolean traverseGraph, DirtyKeyTracker dirtyKeyTracker) {
+ state.update(diff);
+ if (state.isEmpty()) {
+ return null;
+ }
+ return delete
+ ? new DeletingNodeVisitor(graph, invalidationReceiver, state, traverseGraph,
+ dirtyKeyTracker)
+ : new DirtyingNodeVisitor(graph, invalidationReceiver, state, dirtyKeyTracker);
+ }
+
+ /**
+ * Invalidates given values and their upward transitive closure in the graph.
+ */
+ public static void invalidate(DirtiableGraph graph, Iterable<SkyKey> diff,
+ EvaluationProgressReceiver invalidationReceiver, InvalidationState state,
+ DirtyKeyTracker dirtyKeyTracker)
+ throws InterruptedException {
+ // If we are invalidating, we must be in an incremental build by definition, so we must
+ // maintain a consistent graph state by traversing the graph and invalidating transitive
+ // dependencies. If edges aren't present, it would be impossible to check the dependencies of
+ // a dirty node in any case.
+ InvalidatingNodeVisitor visitor =
+ createVisitor(/*delete=*/false, graph, diff, invalidationReceiver, state,
+ /*traverseGraph=*/true, dirtyKeyTracker);
+ if (visitor != null) {
+ visitor.run();
+ }
+ }
+}
