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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.google.inject.Inject;
import com.hivemq.common.shutdown.ShutdownHooks;
import com.hivemq.extension.sdk.api.annotations.NotNull;

import javax.annotation.PostConstruct;
import javax.inject.Singleton;

/**
 * @author Lukas Brandl
 */
@Singleton
public class PersistenceShutdownHookInstaller {

    private final @NotNull ShutdownHooks shutdownHooks;
    private final @NotNull PersistenceShutdownHook persistenceShutdownHook;
    private final @NotNull PersistenceStartup persistenceStartup;

    @Inject
    public PersistenceShutdownHookInstaller(
            final @NotNull ShutdownHooks shutdownHooks,
            final @NotNull PersistenceShutdownHook persistenceShutdownHook,
            final @NotNull PersistenceStartup persistenceStartup) {
        this.shutdownHooks = shutdownHooks;
        this.persistenceShutdownHook = persistenceShutdownHook;
        this.persistenceStartup = persistenceStartup;
    }

    @PostConstruct
    public void postConstruct() {
        shutdownHooks.remove(persistenceStartup);
        shutdownHooks.add(persistenceShutdownHook);
    }

}