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diff --git a/java/com/google/gerrit/server/update/ChangeContext.java b/java/com/google/gerrit/server/update/ChangeContext.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.update;
+
+import static java.util.Objects.requireNonNull;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.notedb.ChangeNotes;
+import com.google.gerrit.server.notedb.ChangeUpdate;
+
+/**
+ * Context for performing the {@link BatchUpdateOp#updateChange} phase.
+ *
+ * <p>A single {@code ChangeContext} corresponds to updating a single change; if a {@link
+ * BatchUpdate} spans multiple changes, then multiple {@code ChangeContext} instances will be
+ * created.
+ */
+public interface ChangeContext extends Context {
+  /**
+   * Get an update for this change at a given patch set.
+   *
+   * <p>A single operation can modify changes at different patch sets. Commits in the NoteDb graph
+   * within this update are created in patch set order.
+   *
+   * <p>To get the current patch set ID, use {@link com.google.gerrit.server.PatchSetUtil#current}.
+   *
+   * @param psId patch set ID.
+   * @return handle for change updates.
+   */
+  ChangeUpdate getUpdate(PatchSet.Id psId);
+
+  /**
+   * Get the up-to-date notes for this change.
+   *
+   * <p>The change data is read within the same transaction that {@link
+   * BatchUpdateOp#updateChange(ChangeContext)} is executing.
+   *
+   * @return notes for this change.
+   */
+  ChangeNotes getNotes();
+
+  /**
+   * Don't bump the value of {@link Change#getLastUpdatedOn()}.
+   *
+   * <p>If called, don't bump the timestamp before storing to ReviewDb. Only has an effect in
+   * ReviewDb, and the only usage should be to match the behavior of NoteDb. Specifically, in NoteDb
+   * the timestamp is updated if and only if the change meta graph is updated, and is not updated
+   * when only drafts are modified.
+   */
+  void dontBumpLastUpdatedOn();
+
+  /**
+   * Instruct {@link BatchUpdate} to delete this change.
+   *
+   * <p>If called, all other updates are ignored.
+   */
+  void deleteChange();
+
+  /** @return change corresponding to {@link #getNotes()}. */
+  default Change getChange() {
+    return requireNonNull(getNotes().getChange());
+  }
+}