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diff --git a/java/com/google/gerrit/server/submit/MergeSuperSetComputation.java b/java/com/google/gerrit/server/submit/MergeSuperSetComputation.java
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+// Copyright (C) 2017 The Android Open Source Project
+//
+// 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.gerrit.server.submit;
+
+import com.google.gerrit.extensions.annotations.ExtensionPoint;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import java.io.IOException;
+
+/**
+ * Interface to compute the merge super set to detect changes that should be submitted together.
+ *
+ * <p>E.g. to speed up performance implementations could decide to do the computation in batches in
+ * parallel on different server nodes.
+ */
+@ExtensionPoint
+public interface MergeSuperSetComputation {
+
+  /**
+   * Compute the set of changes that should be submitted together. As input a set of changes is
+   * provided for which it is known that they should be submitted together. This method should
+   * complete the set by including open predecessor changes that need to be submitted as well. To
+   * decide whether open predecessor changes should be included the method must take the submit type
+   * into account (e.g. for changes with submit type "Cherry-Pick" open predecessor changes must not
+   * be included).
+   *
+   * <p>This method is invoked iteratively while new changes to be submitted together are discovered
+   * by expanding the topics of the changes. This method must not do any topic expansion on its own.
+   *
+   * @param db {@link ReviewDb} instance
+   * @param orm {@link MergeOpRepoManager} that should be used to access repositories
+   * @param changeSet A set of changes for which it is known that they should be submitted together
+   * @param user The user for which the visibility checks should be performed
+   * @return the completed set of changes that should be submitted together
+   */
+  ChangeSet completeWithoutTopic(
+      ReviewDb db, MergeOpRepoManager orm, ChangeSet changeSet, CurrentUser user)
+      throws OrmException, IOException, PermissionBackendException;
+}