Packages

p

akka

serialization

package serialization

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Type Members

  1. trait BaseSerializer extends Serializer

    Base serializer trait with serialization identifiers configuration contract, when globally unique serialization identifier is configured in the reference.conf.

  2. class ByteArraySerializer extends BaseSerializer with ByteBufferSerializer

    This is a special Serializer that Serializes and deserializes byte arrays only, (just returns the byte array unchanged/uncopied)

  3. trait ByteBufferSerializer extends AnyRef

    Serializer between an object and a ByteBuffer representing that object.

    Serializer between an object and a ByteBuffer representing that object.

    Implementations should typically extend SerializerWithStringManifest and in addition to the ByteBuffer based toBinary and fromBinary methods also implement the array based toBinary and fromBinary methods. The array based methods will be used when ByteBuffer is not used, e.g. in Akka Persistence.

    Note that the array based methods can for example be implemented by delegation like this:

     // you need to know the maximum size in bytes of the serialized messages
     val pool = new akka.io.DirectByteBufferPool(defaultBufferSize = 1024 * 1024, maxPoolEntries = 10)
    
    
    // Implement this method for compatibility with `SerializerWithStringManifest`.
    override def toBinary(o: AnyRef): Array[Byte] = {
      val buf = pool.acquire()
      try {
        toBinary(o, buf)
        buf.flip()
        val bytes = new Array[Byte](buf.remaining)
        buf.get(bytes)
        bytes
      } finally {
        pool.release(buf)
      }
    }
    
    // Implement this method for compatibility with `SerializerWithStringManifest`.
    override def fromBinary(bytes: Array[Byte], manifest: String): AnyRef =
      fromBinary(ByteBuffer.wrap(bytes), manifest)
  4. final case class DisabledJavaSerializer(system: ExtendedActorSystem) extends Serializer with ByteBufferSerializer with Product with Serializable

    This Serializer is used when akka.actor.java-serialization = off

  5. abstract class JSerializer extends Serializer

    Java API for creating a Serializer: make sure to include a constructor which takes exactly one argument of type akka.actor.ExtendedActorSystem, because that is the preferred constructor which will be invoked when reflectively instantiating the JSerializer (also possible with empty constructor).

  6. class JavaSerializer extends BaseSerializer

    This Serializer uses standard Java Serialization

  7. class NullSerializer extends Serializer

    This is a special Serializer that Serializes and deserializes nulls only

  8. class Serialization extends Extension

    Serialization module.

    Serialization module. Contains methods for serialization and deserialization as well as locating a Serializer for a particular class as defined in the mapping in the configuration.

  9. final class SerializationSetup extends Setup

    Setup for the serialization subsystem, constructor is *Internal API*, use factories in SerializationSetup()

  10. trait Serializer extends AnyRef

    A Serializer represents a bimap between an object and an array of bytes representing that object.

    A Serializer represents a bimap between an object and an array of bytes representing that object.

    Serializers are loaded using reflection during akka.actor.ActorSystem start-up, where two constructors are tried in order:

    • taking exactly one argument of type akka.actor.ExtendedActorSystem; this should be the preferred one because all reflective loading of classes during deserialization should use ExtendedActorSystem.dynamicAccess (see akka.actor.DynamicAccess), and
    • without arguments, which is only an option if the serializer does not load classes using reflection.

    Be sure to always use the akka.actor.DynamicAccess for loading classes! This is necessary to avoid strange match errors and inequalities which arise from different class loaders loading the same class.

  11. final class SerializerDetails extends AnyRef

    Constructor is internal API: Use the factories SerializerDetails#create or SerializerDetails#apply to construct

  12. abstract class SerializerWithStringManifest extends Serializer

    A Serializer represents a bimap between an object and an array of bytes representing that object.

    A Serializer represents a bimap between an object and an array of bytes representing that object.

    For serialization of data that need to evolve over time the SerializerWithStringManifest is recommended instead of Serializer because the manifest (type hint) is a String instead of a Class. That means that the class can be moved/removed and the serializer can still deserialize old data by matching on the String. This is especially useful for Akka Persistence.

    The manifest string can also encode a version number that can be used in fromBinary to deserialize in different ways to migrate old data to new domain objects.

    If the data was originally serialized with Serializer and in a later version of the system you change to SerializerWithStringManifest the manifest string will be the full class name if you used includeManifest=true, otherwise it will be the empty string.

    Serializers are loaded using reflection during akka.actor.ActorSystem start-up, where two constructors are tried in order:

    • taking exactly one argument of type akka.actor.ExtendedActorSystem; this should be the preferred one because all reflective loading of classes during deserialization should use ExtendedActorSystem.dynamicAccess (see akka.actor.DynamicAccess), and
    • without arguments, which is only an option if the serializer does not load classes using reflection.

    Be sure to always use the akka.actor.DynamicAccess for loading classes! This is necessary to avoid strange match errors and inequalities which arise from different class loaders loading the same class.

Value Members

  1. object BaseSerializer
  2. object DisabledJavaSerializer extends Serializable
  3. object JavaSerializer
  4. object NullSerializer extends NullSerializer
  5. object Serialization
  6. object SerializationExtension extends ExtensionId[Serialization] with ExtensionIdProvider

    SerializationExtension is an Akka Extension to interact with the Serialization that is built into Akka

  7. object SerializationSetup
  8. object SerializerDetails
  9. object Serializers

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