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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.store;
import java.util.NavigableMap;
import org.apache.cassandra.diag.DiagnosticEvent;
/**
* Enables storing and retrieving {@link DiagnosticEvent}s.
* @param type of key that is used to reference an event
*/
public interface DiagnosticEventStore>
{
/**
* Initializes the store.
*/
void load();
/**
* Stores provided event and returns the new associated store key for it.
*/
void store(DiagnosticEvent event);
/**
* Returns a view on all events with a key greater than the provided value (inclusive) up to the specified
* number of results. Events may be added or become unavailable over time. Keys must be unique, sortable and
* monotonically incrementing. Returns an empty map in case no events could be found.
*/
NavigableMap scan(T key, int limit);
/**
* Returns the greatest event ID that can be used to fetch events via {@link #scan(Comparable, int)}.
*/
T getLastEventId();
}