configuring your longevity context

Longevity uses Typesafe Config to help you configure your LongevityContext. The default configuration settings are found in the reference.conf file included in the longevity jar. (Here’s the latest version on GitHub.)

The typical way to supply configuration to your application is to override these defaults in your application.conf file, located on your classpath.

It’s possible to have multiple domain models in the same application, and to supply the LongevityContexts for these models with different configurations. For instance, suppose we have a core domain in our blogging application:

package bloggingapp.core

import longevity.model.annotations.domainModel

package object model {

  @domainModel trait BloggingDomain

}

And a supporting subdomain for managing accounts:

package bloggingapp.accounts

import longevity.model.annotations.domainModel

package object model {

  @domainModel trait AccountsSubdomain

}

You can supply separate com.typesafe.config.Config objects to each LongevityContext like so:

import bloggingapp.accounts.model.AccountsSubdomain
import bloggingapp.core.model.BloggingDomain
import com.typesafe.config.Config
import longevity.context.LongevityContext
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future

val bloggingConfig: Config = loadBloggingConfig()
val bloggingContext = LongevityContext[Future, BloggingDomain](bloggingConfig)

val accountsConfig: Config = loadAccountsConfig()
val accountsContext = LongevityContext[Future, AccountsSubdomain](accountsConfig)

Please see the Typesafe Config documentation for more information on the different ways you can manage your configuration.

Longevity converts the Typesafe Config into a LongevityConfig case class internally. You can use case class configuration if you prefer. Here we use the LongevityConfig case class to define the same configuration as found in the reference.conf file:

import longevity.context.CassandraConfig
import longevity.context.InMem
import longevity.context.JdbcConfig
import longevity.context.LongevityConfig
import longevity.context.MongoConfig
import longevity.context.TestConfig

val longevityConfig = LongevityConfig(
  backEnd = InMem, // one of Cassandra, InMem, JDBC, MongoDB, SQLite
  modelVersion = None,
  autoOpenConnection = false,
  autoCreateSchema = false,
  optimisticLocking = false,
  writeTimestamps = false,
  cassandra = CassandraConfig(
    autoCreateKeyspace = false,
    address = "127.0.0.1",
    credentials = None,
    keyspace = "longevity_main",
    replicationFactor = 1),
  mongodb = MongoConfig(
    uri = "mongodb://127.0.0.1:27017",
    db = "longevity_main"),
  jdbc = JdbcConfig(
    driverClass = "org.sqlite.JDBC"
    url = "jdbc:sqlite:longevity_main.db"),
  test = TestConfig(
    cassandra = CassandraConfig(
      autoCreateKeyspace = false,
      address = "127.0.0.1",
      credentials = None,
      keyspace = "longevity_test",
      replicationFactor = 1),
    mongodb = MongoConfig(
      uri = "mongodb://127.0.0.1:27017",
      db = "longevity_test"),
    jdbc = JdbcConfig(
      driverClass = "org.sqlite.JDBC"
      url = "jdbc:sqlite:longevity_test.db")))

val bloggingContext = new LongevityContext[BloggingDomain](longevityConfig)

The most important configuration setting is longevity.backEnd. This is where you choose your database. Right now, the options are Cassandra, JDBC, InMem, MongoDB, and SQLite.

The JDBC back end is a generic back end that you can use for any databases with a JDBC driver. Unfortunately, we are not able to provide support for any JDBC driver other than SQLite, because we have no way of writing integration tests against this back end without specifying the JDBC driver, and the longevity framework team (i.e., me) already has their hands full supporting the other back ends. That said, we would be more than happy to give you help and advice in troubleshooting any problems. In fact, we’ve tried to make it as easy as possible for you to build and maintain your own JDBC-flavored back end. See these instructions for details.

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