org.apache.flink.runtime.state.gemini.engine.vm.EvictablePage 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.flink.runtime.state.gemini.engine.vm;
/**
* Evictable page which has a score to represent the priority to be evicted.
*/
public interface EvictablePage {
/**
* EvictPage should record the request count.
*/
void addRequestCount(long tickTime, int requestCount);
/**
* score the current Page.
* current score base on 1)request count; 2)page type; 3)page index level.
*/
double score(long tickTime);
/**
* get sum of request.
*/
long getRequestCount(long tickTime);
}