Application Loader

The application loader defines how your lagom-pb/lagom based application should start. Two loading are available:

• the development mode (for local development)
• the production mode

To define the application loader, we must first define the application by extending the io.superflat.lagompb.BaseApplication.

Once the application is implemented then we can define the application loader by extending the com.lightbend.lagom.scaladsl.server.LagomApplicationLoader.

Example:

abstract class AccountApplication(context: LagomApplicationContext) extends BaseApplication(context) {
  // Let us hook in the readSide Processor
  lazy val accountRepository: AccountRepository =
    wire[AccountRepository]

  // wire up the various event and command handler
  lazy val eventHandler: TypedEventHandler[BankAccount] = wire[AccountEventHandler]
  lazy val commandHandler: TypedCommandHandler[BankAccount] = wire[AccountCommandHandler]
  lazy val aggregate: AggregateRoot[BankAccount] = wire[AccountAggregate]
  lazy val encryptor: ProtoEncryption = NoEncryption

  override def aggregateRoot: AggregateRoot[_] = aggregate

  override def server: LagomServer =
    serverFor[AccountService](wire[AccountServiceImpl])
      .additionalRouter(wire[AccountGrpcServiceImpl])

  lazy val accountReadProcessor: AccountReadProcessor = wire[AccountReadProcessor]
  lazy val kafkaPublisher: AccountKafkaPublisher = wire[AccountKafkaPublisher]

  accountReadProcessor.init()
  kafkaPublisher.init()
}

class AccountApplicationLoader extends LagomApplicationLoader {
  override def load(context: LagomApplicationContext): LagomApplication =
    new AccountApplication(context) with AkkaDiscoveryComponents

  override def loadDevMode(context: LagomApplicationContext): LagomApplication =
    new AccountApplication(context) with LagomDevModeComponents

  override def describeService: Option[Descriptor] = Some(readDescriptor[AccountService])
}

Once you define the application make sure to add it to the application.conf as play.application.loader=<your-loader>

Example:

include "lagompb.conf"
play.application.loader=io.superflat.lagompb.samples.account.AccountApplicationLoader