Scala Binding类代码示例

//设置package包名称以及导入依赖的类
package de.stema.pullrequests.client

import de.stema.pullrequests.dto.ProjectDTO
import play.api.inject.{Binding, Module}
import play.api.{Configuration, Environment}

import scala.concurrent.Future


class PullRequestClientModule extends Module {
  def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = {
    Seq(
      if(configuration.getBoolean("offline").getOrElse(false)) {
        bind[PullRequestClient].to[PullRequestSampleClient]
    } else {
        bind[PullRequestClient].to[PullRequestGitHubClient]
    })
  }
}

abstract class PullRequestClient {
  def getPullRequests(configuration: String): Seq[Future[ProjectDTO]]
} 

//设置package包名称以及导入依赖的类
package modules


import play.api.{Configuration, Environment}
import play.api.inject.{Binding, Module}
import play.api.libs.concurrent.AkkaGuiceSupport

import actors.MailsendActor
import com.google.inject.AbstractModule
import schedulers.MailsendScheduler


class MailsendActorModule extends AbstractModule with AkkaGuiceSupport {
  override def configure() = {
    bindActor[MailsendActor]("mailsend-actor")
  }
}

class MailsendScheduleModule extends Module {
  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = {
    Seq(
      bind[MailsendScheduler].toSelf.eagerly
    )
  }
} 

//设置package包名称以及导入依赖的类
package modules


import play.api.{Configuration, Environment}
import play.api.inject.{Binding, Module}
import play.api.libs.concurrent.AkkaGuiceSupport

import actors.HelloWorldActor
import com.google.inject.AbstractModule
import schedulers.HelloWorldScheduler


class HelloWorldActorModule extends AbstractModule with AkkaGuiceSupport {
  override def configure() = {
    bindActor[HelloWorldActor]("hello-world-actor")
  }
}

class HelloWorldScheduleModule extends Module {
  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = {
    Seq(
      bind[HelloWorldScheduler].toSelf.eagerly
    )
  }
} 

//设置package包名称以及导入依赖的类
package controller

import com.google.inject.Inject
import org.flywaydb.core.Flyway
import org.flywaydb.core.internal.util.jdbc.DriverDataSource
import org.scalatestplus.play.FakeApplicationFactory
import play.api.inject.guice.GuiceApplicationBuilder
import play.api.inject.{Binding, Module}
import play.api.{Application, Configuration, Environment}


trait MyApplicationFactory extends FakeApplicationFactory {
  def fakeApplication(): Application = {
    new GuiceApplicationBuilder()
      .configure(Map("myapp.database.url" -> "jdbc:h2:mem:test;DB_CLOSE_DELAY=-1"))
      .bindings(new FlywayModule)
      .build()
  }
}

class FlywayModule extends Module {
  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = {
    Seq(bind[FlywayMigrator].toSelf.eagerly() )
  }
}

class FlywayMigrator @Inject()(env: Environment, configuration: Configuration) {
  def onStart(): Unit = {
    val driver = configuration.underlying.getString("myapp.database.driver")
    val url = configuration.underlying.getString("myapp.database.url")
    val user = configuration.underlying.getString("myapp.database.user")
    val password = configuration.underlying.getString("myapp.database.password")
    val flyway = new Flyway
    flyway.setDataSource(new DriverDataSource(env.classLoader, driver, url, user, password))
    flyway.setLocations("filesystem:modules/flyway/src/main/resources/db/migration")
    flyway.migrate()
  }

  onStart()
} 

//设置package包名称以及导入依赖的类
package com.lightbend.lagom.discovery.consul

import com.lightbend.lagom.javadsl.api.ServiceLocator
import play.api.{Configuration, Environment, Mode}
import play.api.inject.{Binding, Module}

import javax.inject.Singleton
import javax.inject.Inject
import javax.inject.Provider

import com.ecwid.consul.v1.ConsulClient


class ConsulServiceLocatorModule extends Module {

  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] =
    if (environment.mode == Mode.Prod) Seq(
      bind[ServiceLocator].to[ConsulServiceLocator].in[Singleton],
      bind[ConsulConfig].to[ConsulConfig.ConsulConfigImpl],
      bind[ConsulClient].toProvider[ConsulServiceLocatorModule.ConsulClientProvider]
    )
    else Seq.empty
}

object ConsulServiceLocatorModule {
  private class ConsulClientProvider @Inject()(config: ConsulConfig) extends Provider[ConsulClient] {
    override lazy val get: ConsulClient = new ConsulClient(config.agentHostname, config.agentPort)
  }
} 

//设置package包名称以及导入依赖的类
package microtools.config

import java.time.Duration

import play.api.Configuration
import play.api.inject.{Binding, Module}

import scala.util.Try

class BinableMapStringString(underlying: Map[String, String]) extends Map[String, String] {
  override def +[B1 >: String](kv: (String, B1)): Map[String, B1] = underlying + kv

  override def get(key: String): Option[String] = underlying.get(key)

  override def iterator: Iterator[(String, String)] = underlying.iterator

  override def -(key: String): Map[String, String] = underlying - key
}

trait ConfigurationBindings { self: Module =>

  def bindingsFor(configuration: Configuration, key: String): Seq[Binding[_]] = {
    val configs: Configuration =
      configuration.getConfig(key).getOrElse(Configuration.empty)

    configs.keys.toSeq.flatMap(bindKey(configs, _))
  }

  def bindAsMap(configuration: Configuration, name: String, key: String): Seq[Binding[_]] = {
    val configs: Configuration =
      configuration.getConfig(key).getOrElse(Configuration.empty)
    val map: Map[String, String] = configs.keys
      .map(key => key -> configs.getString(key).getOrElse(""))
      .toMap

    Seq(
      bind[BinableMapStringString]
        .qualifiedWith(name)
        .toInstance(new BinableMapStringString(map))
    )
  }

  def bindKey(config: Configuration, key: String): Seq[Binding[_]] = {
    val bindings = Seq.newBuilder[Binding[_]]

    Try(config.underlying.getString(key)).foreach { value =>
      bindings += bind[String].qualifiedWith(key).toInstance(value)
    }
    Try(config.underlying.getBoolean(key)).foreach { value =>
      bindings += bind[Boolean].qualifiedWith(key).toInstance(value)
    }
    Try(config.underlying.getDuration(key)).foreach { value =>
      bindings += bind[Duration].qualifiedWith(key).toInstance(value)
    }
    Try(config.underlying.getLong(key)).foreach { value =>
      bindings += bind[Long].qualifiedWith(key).toInstance(value)
    }

    bindings.result()
  }
} 

//设置package包名称以及导入依赖的类
package de.zalando.cachecool.playmodule

import com.google.inject.name.Names
import com.typesafe.config.{ConfigObject, ConfigValue}
import de.zalando.cachecool.{CacheDefinition, GenericCache, CachecoolFactory}
import play.api.{Configuration, Environment, Logger}
import play.api.inject.{Binding, Module}
import scala.collection.JavaConverters._



class CachecoolModule extends Module {

  private val logger = Logger(this.getClass.getName)


  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = {
    val factories = loadCacheFactories(environment, configuration)

    val cachecoolCachesConfig: ConfigObject = configuration.getObject("cachecool.caches").getOrElse(throw new RuntimeException("Please provide cache configs"))
    val caches = cachecoolCachesConfig.asScala
    caches.flatMap { case (name, config) => buildCache(name, config, factories)
    }.toSeq
  }

  def buildCache(name: String, config: ConfigValue, factories: Map[String, CachecoolFactory]): Seq[Binding[_]] = {
    val cacheDef = CacheDefinition(config)
    val factory = factories.get(cacheDef.factoryName).getOrElse(throw new RuntimeException(s"No factory is defined for ${cacheDef.factoryName}"))

    val cache = factory.build(name, cacheDef.factoryConfig, factories)
    val default = cacheDef.isDefault match {
      case true => Some(bind(classOf[GenericCache]).toInstance(cache))
      case _ => None
    }
    Seq(Some(bind(classOf[GenericCache]).qualifiedWith(Names.named(name)).toInstance(cache)), default).flatten
  }


  private def loadCacheFactories(environment: Environment, configuration: Configuration): Map[String, CachecoolFactory] = {
    val factoriesDefinition = configuration.getObject("cachecool.factories").getOrElse(throw new RuntimeException("Please provide cache factories in config file")).asScala
    (factoriesDefinition map {
      case (name, className) => {
        val clazz: Class[_] = environment.classLoader.loadClass(className.unwrapped().toString)
        logger.info(s"Loading cache factory with name:$name and class:${clazz}")
        val constructor = clazz.getConstructor(classOf[ClassLoader])
        val factoryInstance: CachecoolFactory = constructor.newInstance(environment.classLoader).asInstanceOf[CachecoolFactory]
        (name -> factoryInstance)
      }
    }).toMap

  }
} 

//设置package包名称以及导入依赖的类
package au.com.agiledigital.kamon.play_extensions

import javax.inject.{Inject, Provider}

import akka.actor.ReflectiveDynamicAccess
import play.api.{Logger, Configuration, Environment}
import play.api.inject.{Binding, Module}

import scala.util.{Failure, Success}

class KamonPlayExtensionsModule extends Module {
  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = Seq(
    bind[FutureNameGenerator].toProvider[FutureNameGeneratorProvider],
    bind[Metrics].to[MetricsSingleton].eagerly()
  )
}

class FutureNameGeneratorProvider @Inject()(configuration: Configuration) extends Provider[FutureNameGenerator] {

  private val configurationKey = "kamon.play-extensions.future-name-generator"

  private val dynamics = new ReflectiveDynamicAccess(getClass.getClassLoader)

  override def get(): FutureNameGenerator = {

    configuration.getString(configurationKey) flatMap { fcqn =>
      dynamics.createInstanceFor[FutureNameGenerator](fcqn, Nil) match {
        case Success(generator) => Some(generator)
        case Failure(error) =>
          Logger.warn(s"Failed to create future namer generator [$fcqn] from [$configurationKey].", error)
          None
      }
    } getOrElse new DefaultFutureNameGenerator()
  }
} 

//设置package包名称以及导入依赖的类
package com.lightbend.lagom.internal.javadsl.client

import javax.inject.{ Inject, Provider, Singleton }

import akka.actor.ActorSystem
import com.lightbend.lagom.internal.client.{ CircuitBreakerConfig, CircuitBreakerMetricsProviderProvider, CircuitBreakers }
import com.lightbend.lagom.internal.spi.CircuitBreakerMetricsProvider
import com.lightbend.lagom.javadsl.client.CircuitBreakersPanel
import play.api.inject.{ Binding, Module }
import play.api.{ Configuration, Environment }

class CircuitBreakerModule extends Module {

  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = {
    Seq(
      bind[CircuitBreakersPanel].to[CircuitBreakersPanelImpl],
      // for backward compatibility we still need to provide it for wiring
      bind[CircuitBreakers].toProvider[CircuitBreakersProvider],
      bind[CircuitBreakerMetricsProvider].toProvider[CircuitBreakerMetricsProviderProvider]
    )
  }
}

@Singleton
class CircuitBreakersProvider @Inject() (
  system:               ActorSystem,
  circuitBreakerConfig: CircuitBreakerConfig,
  metricsProvider:      CircuitBreakerMetricsProvider
) extends Provider[CircuitBreakers] {
  lazy val get = {

    // only in case some 3rd party lib are still wiring the old one.
    system.log.warning(
      "CircuitBreakers is deprecated, use CircuitBreakersPanel instead. This warning is probably caused by your " +
        "service locator. If you are using a 3rd party service locator, upgrade your dependencies, otherwise this " +
        "service locator could become incompatible with Lagom in future versions."
    )

    new CircuitBreakers(system, circuitBreakerConfig, metricsProvider)
  }
} 

//设置package包名称以及导入依赖的类
package modules

import play.api.i18n.{DefaultLangs, Langs, MessagesApi}
import play.api.{Configuration, Environment}
import play.api.inject.{Binding, Module}


class I18nModule extends Module {
  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = {
    Seq(
      bind[Langs].to[DefaultLangs],
      bind[MessagesApi].to[services.MyMessagesApi],
      bind[play.i18n.MessagesApi].toSelf,
      bind[play.i18n.Langs].toSelf
    )
  }
} 

//设置package包名称以及导入依赖的类
package com.lightbend.lagom.dns

import com.lightbend.lagom.javadsl.api.ServiceLocator
import play.api.{ Configuration, Environment, Mode }
import play.api.inject.{ Binding, Module }
import javax.inject.Singleton

import play.api.libs.concurrent.Akka
import com.lightbend.dns.locator.{ ServiceLocator => ServiceLocatorService }


class ServiceLocatorModule extends Module {

  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] =
    if (environment.mode == Mode.Prod)
      Seq(
        bind[ServiceLocator].to[DnsServiceLocator].in[Singleton],
        Akka.bindingOf[ServiceLocatorService]("ServiceLocatorService")
      )
    else
      Seq.empty
}