/*
* 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.jackrabbit.core.cluster;
import java.util.List;
import org.apache.jackrabbit.core.observation.EventState;
import org.apache.jackrabbit.core.state.ChangeLog;
/**
* Update operation passed in <code>UpdateEventChannel</code>.
*/
public interface Update {
/**
* Set an attribute of this update operation. Can be used
* to remember some setting for a later notification.
*
* @param name attribute name
* @param value attribute value
*/
void setAttribute(String name, Object value);
/**
* Return an attribute of this update operation.
*
* @param name attribute name
* @return attribute value or <code>null</code>
*/
Object getAttribute(String name);
/**
* Return the local changes of this update operation.
*
* @return local changes
*/
ChangeLog getChanges();
/**
* Return the collection of events this update operation will
* generate.
*
* @return collection of <code>EventState</code>s
*/
List<EventState> getEvents();
/**
* Returns the timestamp whe this update occurred.
*
* @return the timestamp whe this update occurred.
*/
long getTimestamp();
/**
* Returns the user data associated with this update.
*
* @return the user data associated with this update.
*/
String getUserData();
}