/*

* Licensed to the Apache Software Foundation (ASF) under one or more

* contributor license agreements. See the NOTICE file distributed with

* this work for additional information regarding copyright ownership.

* The ASF licenses this file to You 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 org.apache.catalina;

import java.util.Set;

/**

* Interface implemented by session managers that do not keep a complete copy

* of all sessions in memory but do know where every session is. The

* BackupManager is an example of such a Manager as are implementations of the

* StoreManager interface.

* <p>

* With the BackupManager, sessions can be primary (master copy on this node),

* backup (backup copy on this node) or proxy (only the session ID on this

* node). The identity of the primary and backup nodes are known for all

* sessions, including proxy sessions.

* <p>

* With StoreManager implementations, sessions can be primary (session is in

* memory) or proxy (session is in the Store).

*/

public interface DistributedManager {

/**

* Returns the total session count for primary, backup and proxy.

*

* @return The total session count across the cluster.

*/

public int getActiveSessionsFull();

/**

* Returns the list of all sessions IDS (primary, backup and proxy).

*

* @return The complete set of sessions IDs across the cluster.

*/

public Set<String> getSessionIdsFull();

}