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/**
 * Licensed 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 io.journalkeeper.persistence.local.cache;

/**
 * 可管理的Buffer持有者
 * @author LiYue
 * Date: 2019-03-28
 */
public interface BufferHolder extends Timed {
    /**
     * Buffer大小
     * @return Buffer的大小
     */
    int size();

    /**
     * 是否可以释放？
     * @return 是否可以释放？
     */
    boolean isFree();

    /**
     * 尝试释放
     * @return 释放成功返回true，否则返回false
     */
    boolean evict();
    /**
     * 是否可写？
     * @return true：可写，false：只读
     */
    boolean writable();
}