package com.sequenceiq.periscope.config;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurer;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.ehcache.EhCacheCacheManager;
import org.springframework.cache.interceptor.CacheErrorHandler;
import org.springframework.cache.interceptor.CacheResolver;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.cache.interceptor.SimpleCacheErrorHandler;
import org.springframework.cache.interceptor.SimpleCacheResolver;
import org.springframework.cache.interceptor.SimpleKeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import net.sf.ehcache.config.CacheConfiguration;

@Configuration
@EnableCaching
@EnableAutoConfiguration
public class CachingConfig implements CachingConfigurer {

    private static final int MAX_ENTRIES = 1000;

    @Bean
    public net.sf.ehcache.CacheManager ehCacheManager() {
        net.sf.ehcache.config.Configuration config = new net.sf.ehcache.config.Configuration();
        config.addCache(createUserCache());
        return net.sf.ehcache.CacheManager.newInstance(config);
    }

    @Bean
    @Override
    public CacheManager cacheManager() {
        return new EhCacheCacheManager(ehCacheManager());
    }

    @Override
    public CacheResolver cacheResolver() {
        return new SimpleCacheResolver(cacheManager());
    }

    @Bean
    @Override
    public KeyGenerator keyGenerator() {
        return new SimpleKeyGenerator();
    }

    @Override
    public CacheErrorHandler errorHandler() {
        return new SimpleCacheErrorHandler();
    }

    private CacheConfiguration createUserCache() {
        CacheConfiguration cacheConfiguration = new CacheConfiguration();
        cacheConfiguration.setName("userCache");
        cacheConfiguration.setMemoryStoreEvictionPolicy("LRU");
        cacheConfiguration.setMaxEntriesLocalHeap(MAX_ENTRIES);
        return cacheConfiguration;
    }

}