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/*
 * Copyright 2023 Greptime Team
 *
 * 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.greptime.common.util;

/**
 * An object pool.
 */
public interface ObjectPool {

    /**
     * Get an object from the pool.
     */
    T getObject();

    /**
     * Return the object to the pool.  The caller should not use the object beyond this point.
     */
    void returnObject(T returned);

    /**
     * Defines a resource, and the way to create and destroy instances of it.
     */
    interface Resource {

        /**
         * Create a new instance of the resource.
         */
        T create();

        /**
         * Destroy the given instance.
         */
        void close(T instance);
    }
}