1 files changed, 27 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/skyframe/CycleDetector.java b/src/main/java/com/google/devtools/build/skyframe/CycleDetector.java
new file mode 100644
index 0000000000..6cd1585498
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/skyframe/CycleDetector.java
@@ -0,0 +1,27 @@
+// Copyright 2016 The Bazel Authors. 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;
+
+/**
+ * Detects cycles after a {@link ParallelEvaluator} evaluation that did not complete due to cycles.
+ *
+ * <p>Public only for the benefit of alternative graph implementations outside the skyframe package.
+ */
+public interface CycleDetector {
+  void checkForCycles(
+      Iterable<SkyKey> badRoots,
+      EvaluationResult.Builder<?> result,
+      ParallelEvaluatorContext evaluatorContext)
+      throws InterruptedException;
+}