Scala GeneratedMessageCompanion类代码示例

//设置package包名称以及导入依赖的类
package walfie.gbf.raidfinder.server.persistence

import com.trueaccord.scalapb.{GeneratedMessage, GeneratedMessageCompanion, Message}
import java.net.URI
import redis.clients.jedis.{BinaryJedis, Jedis}

trait ProtobufStorage {
  type CacheItem[T] = GeneratedMessage with Message[T]

  def set[T <: CacheItem[T]](key: String, value: T): Unit
  def get[T <: CacheItem[T]](
    key: String
  )(implicit companion: GeneratedMessageCompanion[T]): Option[T]

  def close(): Unit
}

object ProtobufStorage {
  def redis(uri: URI): RedisProtobufStorage = {
    new RedisProtobufStorage(new BinaryJedis(uri))
  }
}

// TODO: Write integration test
class RedisProtobufStorage(redis: BinaryJedis) extends ProtobufStorage {
  def set[T <: CacheItem[T]](key: String, value: T): Unit = {
    redis.set(key.getBytes, value.toByteArray)
  }

  def get[T <: CacheItem[T]](
    key: String
  )(implicit companion: GeneratedMessageCompanion[T]): Option[T] = {
    Option(redis.get(key.getBytes)).flatMap { bytes =>
      companion.validate(bytes).toOption
    }
  }

  def close(): Unit = redis.close()
}

object NoOpProtobufStorage extends ProtobufStorage {
  def set[T <: CacheItem[T]](key: String, value: T): Unit = ()

  def get[T <: CacheItem[T]](
    key: String
  )(implicit companion: GeneratedMessageCompanion[T]): Option[T] = None

  def close(): Unit = ()
} 

//设置package包名称以及导入依赖的类
package net.cakesolutions.strictify.scalapb.ops

import scala.util.Try

import com.trueaccord.scalapb.{GeneratedMessage, GeneratedMessageCompanion, Message}
import net.cakesolutions.strictify.core.{Binding, StrictifyError}

trait StrictTypeDeserializer[S] {
  def parseFrom(s: Array[Byte]): Either[StrictifyError, S]
}
object StrictTypeDeserializer {
  implicit def instance[S, L <: GeneratedMessage with Message[L]](
    implicit
    binding: Binding.Aux[S, L],
    companion: GeneratedMessageCompanion[L]
  ) = new StrictTypeDeserializer[S] {
    override def parseFrom(s: Array[Byte]): Either[StrictifyError, S] =
      Try(companion.parseFrom(s)).fold(e => Left(StrictifyError(e)), binding.strictify.apply)
  }
}

trait StrictTypeSerializer[S] {
  def toByteArray(value: S): Array[Byte]
}
object StrictTypeSerializer {
  implicit def instance[S, L <: GeneratedMessage with Message[L]](
    implicit
    binding: Binding.Aux[S, L]
  ) = new StrictTypeSerializer[S] {
    override def toByteArray(value: S): Array[Byte] =
      binding.loosen(value).toByteArray
  }
}

object SerializationOps {
  def parseFrom[S: StrictTypeDeserializer](s: Array[Byte]): Either[StrictifyError, S] =
    implicitly[StrictTypeDeserializer[S]].parseFrom(s)

  def toByteArray[S: StrictTypeSerializer](value: S): Array[Byte] =
    implicitly[StrictTypeSerializer[S]].toByteArray(value)
} 

//设置package包名称以及导入依赖的类
package tmt.demo.connectors

import akka.cluster.pubsub.DistributedPubSub
import akka.cluster.pubsub.DistributedPubSubMediator.Publish
import com.trueaccord.scalapb.GeneratedMessageCompanion
import tmt.app.utils.{ActorRuntime, PbMessage}
import tmt.demo.zeromq_drivers.ZmqSubscriberFactory

class ZmqToAkkaFlow(actorRuntime: ActorRuntime, zmqSubscriberFactory: ZmqSubscriberFactory) {
  import actorRuntime._

  def connect[Msg <: PbMessage.Of[Msg]](
    publishingTopic: String,
    subscriberPort: Int,
    responseParser: GeneratedMessageCompanion[Msg]
  ) = {
    val zmqSubscriber = zmqSubscriberFactory.make(subscriberPort, responseParser)
    zmqSubscriber.stream
      .runForeach { message =>
        DistributedPubSub(system).mediator ! Publish(publishingTopic, message)
      }.onComplete { x =>
        zmqSubscriber.shutdown()
      }
  }
} 

//设置package包名称以及导入依赖的类
package tmt.demo.zeromq_drivers

import com.trueaccord.scalapb.{GeneratedMessage, GeneratedMessageCompanion}
import org.zeromq.ZMQ
import tmt.app.configs.AppSettings
import tmt.app.utils.{ActorRuntime, EC, PbMessage}

import scala.concurrent.ExecutionContext.global
import scala.concurrent.Future
import scala.util.control.NonFatal

class ZmqServer(settings: AppSettings, runtime: ActorRuntime) {

  import runtime._

  val address = s"tcp://*:${settings.mcsCommandsPort}"

  private val socket = zmqContext.socket(ZMQ.REP)
  socket.bind(address)
  private val ec = EC.singleThreadedEc()

  def start[Req <: PbMessage.Of[Req]](
    reqParser: GeneratedMessageCompanion[Req]
  )(f: Req => GeneratedMessage): Future[Unit] = Future {
    while (true) {
      try {
        val message = socket.recv(0)
        val request = reqParser.parseFrom(message)
        println(s"***** ZmqSever received : [$request]")
        Thread.sleep(100)
        socket.send(f(request).toByteArray, 0)
      } catch {
        case NonFatal(ex) =>
          ex.printStackTrace()
          socket.send("error".getBytes, 0)
      }

    }
  }(ec).map { x =>
    println(s"ZmqServer completed with value: $x")
  }(global)

  def shutdown(): Unit = {
    socket.close()
    ec.shutdown()
  }
} 

//设置package包名称以及导入依赖的类
package tmt.demo.zeromq_drivers

import akka.stream.scaladsl.Source
import com.trueaccord.scalapb.GeneratedMessageCompanion
import org.zeromq.ZMQ
import tmt.app.configs.AppSettings
import tmt.app.utils.{PbMessage, EC, ActorRuntime}

import scala.concurrent.Future

class ZmqSubscriber[Msg <: PbMessage.Of[Msg]](
  port: Int,
  responseParser: GeneratedMessageCompanion[Msg],
  settings: AppSettings,
  runtime: ActorRuntime
) {

  import runtime._

  val address = s"tcp://${settings.mcsHostname}:$port"

  private val socket = zmqContext.socket(ZMQ.SUB)
  println(s"ZmqSubscriber connecting to $address")
  socket.connect(address)
  socket.subscribe(Array.empty)

  private val ec = EC.singleThreadedEc()

  val stream = {
    Source
      .repeat(())
      .mapAsync(1)(_ => receive())
      .map(bytes => responseParser.parseFrom(bytes))
      .map(x => {println(s"********* ZmqSubscriber received $x"); x})
  }

  private def receive() = Future {
    socket.recv(0)
  }(ec)

  def shutdown(): Unit = {
    socket.close()
    ec.shutdown()
  }
}

class ZmqSubscriberFactory(settings: AppSettings, runtime: ActorRuntime) {
  def make[Msg <: PbMessage.Of[Msg]](port: Int, responseParser: GeneratedMessageCompanion[Msg]) =
    new ZmqSubscriber[Msg](port, responseParser, settings, runtime)
} 

//设置package包名称以及导入依赖的类
package tmt.demo.zeromq_drivers

import com.trueaccord.scalapb.{GeneratedMessage, GeneratedMessageCompanion}
import org.zeromq.ZMQ
import tmt.app.configs.AppSettings
import tmt.app.utils.{PbMessage, EC, ActorRuntime}

import scala.concurrent.Future

class ZmqClient(settings: AppSettings, runtime: ActorRuntime) {

  import runtime._

  val address = s"tcp://${settings.mcsHostname}:${settings.mcsCommandsPort}"

  private val socket = zmqContext.socket(ZMQ.REQ)
  println(s"ZmqClient is connecting to server $address")
  socket.connect(address)
  private val ec = EC.singleThreadedEc()

  def query[Req <: GeneratedMessage, Res <: PbMessage.Of[Res]](
    request: Req,
    responseParser: GeneratedMessageCompanion[Res]
  ): Future[Res] = Future {
    println(s"***** ZmqClient sending $request to $address at ${System.currentTimeMillis()}")
    socket.send(request.toByteArray, 0)
    responseParser.parseFrom(socket.recv(0))
  }(ec)

  def shutdown(): Unit = {
    socket.close()
    ec.shutdown()
  }
} 

//设置package包名称以及导入依赖的类
package org.karps.structures

import scala.util.{Failure, Success, Try}

import com.trueaccord.scalapb.{GeneratedMessage, Message, GeneratedMessageCompanion}
import com.trueaccord.scalapb.json._

object ProtoUtils {
  def checkField[X](x: X, fieldName: String): Try[X] = {
    if (x == null) {
      missingField(fieldName)
    } else {
      Success(x)
    }
  }
  
  def checkField[X](x: Option[X], fieldName: String): Try[X] = {
    if (x == None) {
      missingField(fieldName)
    } else {
      Success(x.get)
    }
  }

  def missingField[X](fieldName: String): Try[X] = {
    Failure(new Exception(s"Missing field $fieldName"))
  }
  
  def unrecognized[X](fieldName: String, x: Int): Try[X] = {
    Failure(new Exception(s"unrecognized value for $fieldName: $x"))
  }
  
  def sequence[T](xs : Seq[Try[T]]) : Try[Seq[T]] = (Try(Seq[T]()) /: xs) {
    (a, b) => a flatMap (c => b map (d => c :+ d))
  }
  
  def fromExtra[A <: GeneratedMessage with Message[A]](extra: OpExtra)(
implicit cmp: GeneratedMessageCompanion[A]): Try[A] = {
    Try(JsonFormat.fromJsonString[A](extra.content))
  }
  
   def fromString[A <: GeneratedMessage with Message[A]](extra: String)(
implicit cmp: GeneratedMessageCompanion[A]): Try[A] = {
    Try(JsonFormat.fromJsonString[A](extra))
  }

  def toJsonString[A <: GeneratedMessage](m: A): String = printer.print(m)

  private val printer = new Printer(includingDefaultValueFields = false)
} 

//设置package包名称以及导入依赖的类
package com.example.utilities.serialization

import akka.http.scaladsl.marshalling.{Marshaller, ToEntityMarshaller}
import akka.http.scaladsl.model.MediaType.Compressible
import akka.http.scaladsl.model.{ContentType, ContentTypes, HttpEntity, MediaType}
import akka.http.scaladsl.unmarshalling.Unmarshaller.UnsupportedContentTypeException
import akka.http.scaladsl.unmarshalling.{FromEntityUnmarshaller, Unmarshaller}
import akka.http.scaladsl.util.FastFuture
import com.google.protobuf.CodedInputStream
import com.trueaccord.scalapb.json.JsonFormat
import com.trueaccord.scalapb.{GeneratedMessage, GeneratedMessageCompanion, Message}

import scala.concurrent.Future

trait ScalaPBMarshalling {
  private val protobufContentType = ContentType(MediaType.applicationBinary("octet-stream", Compressible, "proto"))
  private val applicationJsonContentType = ContentTypes.`application/json`

  def scalaPBFromRequestUnmarshaller[O <: GeneratedMessage with Message[O]](companion: GeneratedMessageCompanion[O]): FromEntityUnmarshaller[O] = {
    Unmarshaller.withMaterializer[HttpEntity, O](_ => implicit mat => {
      case [email protected](`applicationJsonContentType`, data) =>
        val charBuffer = Unmarshaller.bestUnmarshallingCharsetFor(entity)
        FastFuture.successful(JsonFormat.fromJsonString(data.decodeString(charBuffer.nioCharset().name()))(companion))
      case [email protected](`protobufContentType`, data) =>
        FastFuture.successful(companion.parseFrom(CodedInputStream.newInstance(data.asByteBuffer)))
      case entity =>
        Future.failed(UnsupportedContentTypeException(applicationJsonContentType, protobufContentType))
    })
  }

  implicit def scalaPBToEntityMarshaller[U <: GeneratedMessage]: ToEntityMarshaller[U] = {
    def jsonMarshaller(): ToEntityMarshaller[U] = {
      val contentType = applicationJsonContentType
      Marshaller.withFixedContentType(contentType) { value =>
        HttpEntity(contentType, JsonFormat.toJsonString(value))
      }
    }

    def protobufMarshaller(): ToEntityMarshaller[U] = {
      Marshaller.withFixedContentType(protobufContentType) { value =>
        HttpEntity(protobufContentType, value.toByteArray)
      }
    }

    Marshaller.oneOf(jsonMarshaller(), protobufMarshaller())
  }

} 

//设置package包名称以及导入依赖的类
package com.trueaccord.scalapb.parquet

import java.util

import com.trueaccord.scalapb.{GeneratedMessage, GeneratedMessageCompanion, Message}
import org.apache.hadoop.conf.Configuration
import org.apache.parquet.hadoop.api.{InitContext, ReadSupport}
import org.apache.parquet.hadoop.api.ReadSupport.ReadContext
import org.apache.parquet.io.api.{GroupConverter, RecordMaterializer}
import org.apache.parquet.schema.MessageType

class ScalaPBReadSupport[T <: GeneratedMessage with Message[T]] extends ReadSupport[T] {
  override def prepareForRead(
    configuration: Configuration,
    keyValueMetaData: util.Map[String, String],
    fileSchema: MessageType,
    readContext: ReadContext): RecordMaterializer[T] = {
    val protoClass = Option(keyValueMetaData.get(ScalaPBReadSupport.PB_CLASS)).getOrElse(throw new RuntimeException(s"Value for ${ScalaPBReadSupport.PB_CLASS} not found."))
    val cmp = {
      import scala.reflect.runtime.universe

      val runtimeMirror = universe.runtimeMirror(getClass.getClassLoader)

      val module = runtimeMirror.staticModule(protoClass)

      val obj = runtimeMirror.reflectModule(module)

      obj.instance.asInstanceOf[GeneratedMessageCompanion[T]]
    }

    new RecordMaterializer[T] {
      val root = new ProtoMessageConverter[T](cmp, fileSchema, onEnd = _ => ())

      override def getRootConverter: GroupConverter = root

      override def getCurrentRecord: T = root.getCurrentRecord
    }
  }

  override def init(context: InitContext): ReadContext = {
    new ReadContext(context.getFileSchema)
  }
}

object ScalaPBReadSupport {
  val PB_CLASS = "parquet.scalapb.class"
}