org.apache.cassandra.diag.LastEventIdBroadcasterMBean Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of cassandra-all Show documentation
Show all versions of cassandra-all Show documentation
The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.diag;
import java.util.Map;
/**
* Provides a list of event types and the corresponding highest event IDs. Consumers may these IDs to determine
* if new data is available.
*
* Example result
*
*
*
* Event
* Last ID
*
*
* BootstrapEvent
* 312
*
*
* CompactionEvent
* a53f9338-5f24-11e8-9c2d-fa7ae01bbebc
*
*
*
* Clients may either retrieve the current list of all events IDs, or make conditional requests for event IDs
* based on the timestamp of the last update (much in the sense of e.g. HTTP's If-Modified-Since semantics).
*/
public interface LastEventIdBroadcasterMBean
{
/**
* Retrieves a list of all event types and their highest IDs.
*/
Map getLastEventIds();
/**
* Retrieves a list of all event types and their highest IDs, if updated since specified timestamp, or null.
* @param lastUpdate timestamp to use to determine if IDs have been updated
*/
Map getLastEventIdsIfModified(long lastUpdate);
}