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Adds support for CRaC (Coordinated Restore at Checkpoint) to the Micronaut Framework.

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/*
 * Copyright 2017-2023 original authors
 *
 * 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
 *
 * https://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.micronaut.crac.resources.redis;

import io.micronaut.configuration.lettuce.cache.RedisCache;
import io.micronaut.context.BeanContext;
import io.micronaut.context.annotation.EachBean;
import io.micronaut.context.annotation.Requires;
import io.micronaut.core.annotation.Experimental;
import io.micronaut.core.util.StringUtils;
import io.micronaut.crac.CracEventPublisher;
import io.micronaut.crac.CracResourceRegistrar;
import org.crac.Context;
import org.crac.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Destroys any RedisCache beans before checkpointing.
 *
 * @author Tim Yates
 * @since 1.2.1
 */
@Experimental
@EachBean(RedisCache.class)
@Requires(classes = {RedisCache.class})
@Requires(bean = CracResourceRegistrar.class)
@Requires(property = RedisCacheResource.ENABLED_PROPERTY, defaultValue = StringUtils.TRUE, value = StringUtils.TRUE)
public class RedisCacheResource extends AbstractRedisResource {

    static final String ENABLED_PROPERTY = CracRedisConfigurationProperties.PREFIX + ".cache-enabled";

    private static final Logger LOG = LoggerFactory.getLogger(RedisCacheResource.class);

    private final CracEventPublisher eventPublisher;
    private final RedisCache redisCache;

    public RedisCacheResource(
        BeanContext beanContext,
        CracEventPublisher eventPublisher,
        RedisCache redisCache
    ) {
        super(beanContext);
        this.eventPublisher = eventPublisher;
        this.redisCache = redisCache;
    }

    @Override
    public void beforeCheckpoint(Context context) throws Exception {
        eventPublisher.fireBeforeCheckpointEvents(this, () ->
            destroyAction(redisCache, LOG, "Destroying Redis cache {}")
        );
    }
}