com.hivemq.persistence.Sizable Maven / Gradle / Ivy

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HiveMQ CE is a Java-based open source MQTT broker that fully supports MQTT 3.x and MQTT 5

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/*
 * Copyright 2019-present HiveMQ GmbH
 *
 * 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 com.hivemq.persistence;

import com.hivemq.extension.sdk.api.annotations.ThreadSafe;

/**
 * Allows the estimation of the in memory size of an object.
 *
 * @author Georg Held
 */
public interface Sizable {

    int SIZE_NOT_CALCULATED = -1;

    @ThreadSafe
    int getEstimatedSize();
}