Redis

Alpas doesn't bundle Redis or any Redis client, but it is really easy to integrate and use a Redis client library, like Jedis, in your app.

Let's see how we can easily integrate Jedis client in an app using a service provider.

Crate a new service provider using make:provider Alpas command:


$ alpas make:provider JedisServiceProvider

Register an instance of JedisPool in the newly created JedisServiceProvider class, making sure that the pool gets closed when the app is stopped:


// providers/JedisServiceProvider.kt
import dev.alpas.Application
import dev.alpas.ServiceProvider
import dev.alpas.make
import redis.clients.jedis.JedisPool
import redis.clients.jedis.JedisPoolConfig

class JedisServiceProvider : ServiceProvider {
    override fun register(app: Application) {
        app.bind(JedisPool(JedisPoolConfig(), "localhost"))
    }

    override fun stop(app: Application) {
        app.logger.debug { "Closing Jedis Pool" }
        app.make<JedisPool>().close()
    }
}

Ask the pool to create a Jedis client and use it to get, or set, any values in and out of Redis:


fun get(page: String, markdown: Markdown): String {
    return jedisPool.resource.use { jedis ->
       return jedis.hget("docs", page)?: markdown.convert(page).also { 
           jedis.hset("docs", page, it) 
       }
    }
}

That's all there is!

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