1 files changed, 30 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/actions/NotifyOnActionCacheHit.java b/src/main/java/com/google/devtools/build/lib/actions/NotifyOnActionCacheHit.java
new file mode 100644
index 0000000000..fa9b54e9d4
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/actions/NotifyOnActionCacheHit.java
@@ -0,0 +1,30 @@
+// 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.lib.actions;
+
+/**
+ * An action which must know when it is skipped due to an action cache hit.
+ *
+ * Use should be rare, as the action graph is a functional model.
+ */
+public interface NotifyOnActionCacheHit extends Action {
+
+  /**
+   * Called when action has "cache hit", and therefore need not be executed.
+   *
+   * @param executor the executor
+   */
+  void actionCacheHit(Executor executor);
+}