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package com.example.configurations;

import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;

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#dump file name (up to you)
dbfilename cache-dump.rdb
#dump every 300 seconds if at least 1000 keys changed (up to you)
save 300 1000
#memory limit up to 128mb (up to you)
maxmemory 128mb
#remove the less recently used (LRU) keys first
maxmemory-policy allkeys-lru
#LRU precision (up to you)
maxmemory-samples 10

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package com.example.model;

import java.io.Serializable;

public class Post implements Serializable {

    private String id;
    private String title;
    private String description;
    private String image;

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@Cacheable(value = "post-single", key = "#id", unless = "#result.shares < 500")
@GetMapping("/{id}")
public Post getPostByID(@PathVariable String id) throws PostNotFoundException {
    log.info("get post with id {}", id);
    return postService.getPostByID(id);
}
@Cacheable(value = "post-top")
@GetMapping("/top")
public List<Post> getTopPosts() {
    return postService.getTopPosts();

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@CachePut(value = "post-single", key = "#post.id")
@PutMapping("/update")
public Post updatePostByID(@RequestBody Post post) throws PostNotFoundException {
    log.info("update post with id {}", post.getId());
    postService.updatePost(post);
    return post;
}

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@CacheEvict(value = "post-single", key = "#id")
@DeleteMapping("/delete/{id}")
public void deletePostByID(@PathVariable String id) throws PostNotFoundException {
    log.info("delete post with id {}", id);
    postService.deletePost(id);
}

@CacheEvict(value = "post-top")
@GetMapping("/top/evict")
public void evictTopPosts() {

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public class Post implements Serializable {

    private String id;
    private String title;
    private String description;
    private String image;
    private int shares;
    private Author author;
    //getters setters and constructors
}