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diff --git a/java/com/google/gerrit/server/account/GroupBackend.java b/java/com/google/gerrit/server/account/GroupBackend.java
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+++ b/java/com/google/gerrit/server/account/GroupBackend.java
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+// Copyright (C) 2012 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.account;
+
+import com.google.gerrit.common.Nullable;
+import com.google.gerrit.common.data.GroupDescription;
+import com.google.gerrit.common.data.GroupReference;
+import com.google.gerrit.extensions.annotations.ExtensionPoint;
+import com.google.gerrit.reviewdb.client.AccountGroup;
+import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.project.ProjectState;
+import java.util.Collection;
+
+/** Implementations of GroupBackend provide lookup and membership accessors to a group system. */
+@ExtensionPoint
+public interface GroupBackend {
+  /** @return {@code true} if the backend can operate on the UUID. */
+  boolean handles(AccountGroup.UUID uuid);
+
+  /**
+   * Looks up a group in the backend. If the group does not exist, null is returned.
+   *
+   * @param uuid the group identifier
+   * @return the group
+   */
+  @Nullable
+  GroupDescription.Basic get(AccountGroup.UUID uuid);
+
+  /** @return suggestions for the group name sorted by name. */
+  Collection<GroupReference> suggest(String name, @Nullable ProjectState project);
+
+  /** @return the group membership checker for the backend. */
+  GroupMembership membershipsOf(IdentifiedUser user);
+
+  /** @return {@code true} if the group with the given UUID is visible to all registered users. */
+  boolean isVisibleToAll(AccountGroup.UUID uuid);
+}