// Copyright (C) 2009 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.reviewdb.client.AccountGroup;
import com.google.gerrit.server.group.InternalGroup;
import java.io.IOException;
import java.util.Optional;

/** Tracks group objects in memory for efficient access. */
public interface GroupCache {
  /**
   * Looks up an internal group by its ID.
   *
   * @param groupId the ID of the internal group
   * @return an {@code Optional} of the internal group, or an empty {@code Optional} if no internal
   *     group with this ID exists on this server or an error occurred during lookup
   */
  Optional<InternalGroup> get(AccountGroup.Id groupId);

  /**
   * Looks up an internal group by its name.
   *
   * @param name the name of the internal group
   * @return an {@code Optional} of the internal group, or an empty {@code Optional} if no internal
   *     group with this name exists on this server or an error occurred during lookup
   */
  Optional<InternalGroup> get(AccountGroup.NameKey name);

  /**
   * Looks up an internal group by its UUID.
   *
   * @param groupUuid the UUID of the internal group
   * @return an {@code Optional} of the internal group, or an empty {@code Optional} if no internal
   *     group with this UUID exists on this server or an error occurred during lookup
   */
  Optional<InternalGroup> get(AccountGroup.UUID groupUuid);

  /** Notify the cache that a new group was constructed. */
  void onCreateGroup(AccountGroup group) throws IOException;

  void evict(AccountGroup.UUID groupUuid, AccountGroup.Id groupId, AccountGroup.NameKey groupName)
      throws IOException;

  void evictAfterRename(AccountGroup.NameKey oldName) throws IOException;
}