Hi I am planning to use Guava Cache or Caffeine Cache in my application as below way -
On application start DB call initiated and store the result into cache. I don't want to use expiration or recycling feature of above cache means data should present in cache all the time until application restart.
How can I implement any of this cache in my Java Spring Boot Application. I do not want to use Spring's Caching functionality.
I want to update or add the values in cache on certain condition.
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I am currently developing an application that uses Spring Cache.
Currently it's schedually evicted in every 5 mins, but it's really high traffical application and it's possible that while deleting the cache any user can read the cache in same time.
I could call cacheable method inside the eviction method but are there any better practices for that behavior.
I have a Spring Boot 2 application that has caching with Caffeine cache manager already implemented. Caching is implemented in a standard way with #Cacheable, #CacheEvict, #CachePut annotations.
I migrated the app for using Redis to have caching distributed between pods.
The problem now is with metrics. Before migration Caffeine exposed cache metrics like cache_puts_total, cache_gets_total, etc. and now there is nothing. Is there something implemented for metrics in RedisCacheManager? I can not find anything.
Unfortunately as you can see in the Spring Boot documentation: 52. Metrics, Spring Boot does not provide cache statistics for Redis by default:
By default, Spring Boot provides cache statistics for EhCache, Hazelcast, Infinispan, JCache and Guava. You can add additional CacheStatisticsProvider beans if your favourite caching library isn’t supported out of the box.
As another alternative to implementing this yourself, you can use Redisson. This Redis client comes with an integration with Spring that exposes Prometheus metrics. Your metrics will look just like you hint:
# HELP cache_gets_total the number of times cache lookup methods have returned an uncached (newly loaded) value, or null
# TYPE cache_gets_total counter
cache_gets_total{cache="...",cacheManager="...",name="...",result="miss",} 0.0
cache_gets_total{cache="...",cacheManager="...",name="...",result="hit",} 0.0
# HELP cache_puts_total The number of entries added to the cache
# TYPE cache_puts_total counter
cache_puts_total{cache="...",cacheManager="...",name="...",} 0.0
I have a Spring Boot application that uses MongoDB. My plan is to store data in a distributed caching system before it gets inserted into Mongo. If the database fails, the caching will have a queue and send to the DB once it is up. So, the plan is to make the caching layer in between the application and Mongo.
Can you suggest some ideas on how to implement this using Apache Ignite?
Take a look at write-behind cache store mode. It retries writing to the underlying database if insertion to the underlying DB fails. Let me know how it works for you.
You can also implement a custom CacheStore for an Ignite cache that will do the caching and enable write through for it. If the connection is lost, then you'll be able to collect entries in a buffer, while retrying to establish the connection back.
See more: https://apacheignite.readme.io/docs/3rd-party-store
We have started using infinispan cache with wildfly 13 in our web application. The web application is deployed in wildfly domain mode in a cluster of two node with one acting as master and the other as slave. In the application we have an admin feature, where the admin can terminate a user.
So what we want to do is add session objects to Infinispan cache and retrieve it and terminate it when required. I am aware that HttpSession object is not serializable hence it cannot be added to cache but every attribute added to the session object is serilizable so my question is, is there a workaround for the issue? Because right now we get a NotSerializable error when I try to add session to cache and it's also no longer possible to retrieve session from sessionId and terminate it due to security reasons.
There is no need to manually interact with the Infinispan cache: WildFly transparently supports full http session clustering with Infinispan. See https://docs.jboss.org/author/display/WFLY10/High+Availability+Guide
I have a few instances of Spring apps running behind a load balancer. I am using EHCache as a caching system on each of these instances.
Let's say I receive a request that is refreshing a part of the cache on one instance. I need a way to tell the other instances to refresh their cache (or to replicate it).
I'm more interested in a solution based on Spring and not just cache replication and that's because there are other scenarios similar with this one that require the same solution.
How can I achieve this?
There is no simple Spring solution for this. Depends on the requirements. You can use any kind of PubSub like a JMS topic to notify your nodes. This way the problem can be that you cannot guarantee consistency. The other nodes can still read the old data for a while. In my current project we use Redis. We configured it as cache with Spring Data Redis and theres no need to notify the other nodes since the cache is shared. In non cache scenarios we also use redis as a PubSub service.