/*
 * 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;

import java.util.concurrent.atomic.AtomicInteger;

/**
 * Provider for counters of checkpoint writes progress.
 */
public interface CheckpointWriteProgressSupplier {
    /**
     * Counter for written checkpoint pages. Not null only if checkpoint is running.
     */
    public AtomicInteger writtenPagesCounter();

    /**
     * @return Counter for fsynced checkpoint pages. Not null only if checkpoint is running.
     */
    public AtomicInteger syncedPagesCounter();

    /**
     * @return Counter for evicted pages during current checkpoint. Not null only if checkpoint is running.
     */
    public AtomicInteger evictedPagesCntr();

    /**
     * @return Number of pages in current checkpoint. If checkpoint is not running, returns 0.
     */
    public int currentCheckpointPagesCount();
}