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• LastEventIdBroadcasterMBean.java

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org.apache.cassandra.diag.LastEventIdBroadcasterMBean Maven / Gradle / Ivy

/*
 * 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);
}