Loading items at startup (cache warming)

[Nikunj Lahoti]

1. What version of Ehcache you are currently using; 3.1
   
2. Paste the configuration for the Cache/CacheManager you have an issue with; Below
   
3. Add any name and version of other library or framework you use Ehcache with (e.g. Hibernate); Spring 4.3
   
4. Providing JDK and OS versions maybe useful as well. JDK 8; Mac

Hi,

With Ehcache 3, what's the recommended way to pre-fetch `some` items in the cache on start up?

I am using CacheLoaderWriter<> for my caches.

CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder().build(true);
cacheWriteBehind = cacheManager.createCache("cacheWriteBehind",
        CacheConfigurationBuilder.newCacheConfigurationBuilder(K.class, V.class, ResourcePoolsBuilder.newResourcePoolsBuilder().heap(answerCacheSize, EntryUnit.ENTRIES))
                .withLoaderWriter(cacheLoaderWriter)
                .add(WriteBehindConfigurationBuilder
                        .newBatchedWriteBehindConfiguration(10, TimeUnit.SECONDS, 10)
                        .queueSize(100)
                        .concurrencyLevel(1)
                        .enableCoalescing())
                .build());

Found a couple of links for doing it in Ehcache 2 via Spring:

http://stackoverflow.com/questions/27940704/how-to-load-cache-on-startup-in-spring

http://www.ehcache.org/documentation/2.7/configuration/configuration#cache-warming-for-multi-tier-caches

Regards,

Nikunj Lahoti

[Louis Jacomet]

Ehcache 3 does not have a native module for doing cache warmup.

You can use a similar approach as the one described in the stackoverflow thread, that is a post construct invocation.

Just need to know which keys you want to fetch since the cache will be doing the loading transparently.

Regards,

Louis

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