modules/core/src/main/java/org/apache/ignite/internal/processors/cache/persistence/pagemem/PageReplacementPolicyFactory.java

/*
 * 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.ignite.internal.processors.cache.persistence.pagemem;

/**
 * Page replacement policy factory.
 */
public interface PageReplacementPolicyFactory {
    /**
     * Calculaete amount of memory required to service {@code pagesCnt} pages.
     *
     * @param pagesCnt Pages count.
     */
    public long requiredMemory(int pagesCnt);

    /**
     * Create page replacement policy.
     *
     * @param seg Page memory segment.
     * @param ptr Pointer to memory region.
     * @param pagesCnt Pages count.
     */
    public PageReplacementPolicy create(PageMemoryImpl.Segment seg, long ptr, int pagesCnt);
}