Package com.esotericsoftware.kryo.serializers

Class ExternalizableSerializer

  • public class ExternalizableSerializer
extends Serializer
    Writes using the objects externalizable interface if it can reliably do so. Typically, a object can be efficiently written with Kryo and Java's externalizable interface. However, there may be behavior problems if the class uses either the 'readResolve' or 'writeReplace' methods. We will fall back onto the standard JavaSerializer if we detect either of these methods.

    Note that this class does not specialize the type on Externalizable. That is because if we fall back on the JavaSerializer it may have an readResolve method that returns an object of a different type.

    • Constructor Detail

      • ExternalizableSerializer

        public ExternalizableSerializer()

    • Method Detail

      • write

        public void write​(Kryo kryo,
                  Output output,
                  java.lang.Object object)
        Description copied from class: Serializer
        Writes the bytes for the object to the output.

        This method should not be called directly, instead this serializer can be passed to Kryo write methods that accept a serialier.

        Specified by:
        write in class Serializer
        object - May be null if Serializer.getAcceptsNull() is true.

      • read

        public java.lang.Object read​(Kryo kryo,
                             Input input,
                             java.lang.Class type)
        Description copied from class: Serializer
        Reads bytes and returns a new object of the specified concrete type.

        Before Kryo can be used to read child objects, Kryo.reference(Object) must be called with the parent object to ensure it can be referenced by the child objects. Any serializer that uses Kryo to read a child object may need to be reentrant.

        This method should not be called directly, instead this serializer can be passed to Kryo read methods that accept a serialier.

        Specified by:
        read in class Serializer
        Returns:
        May be null if Serializer.getAcceptsNull() is true.

      • writeExternal

        private void writeExternal​(Kryo kryo,
                           Output output,
                           java.lang.Object object)

      • readExternal

        private java.lang.Object readExternal​(Kryo kryo,
                                      Input input,
                                      java.lang.Class type)

      • getObjectOutput

        private java.io.ObjectOutput getObjectOutput​(Kryo kryo,
                                             Output output)

      • getObjectInput

        private java.io.ObjectInput getObjectInput​(Kryo kryo,
                                           Input input)

      • getJavaSerializerIfRequired

        private JavaSerializer getJavaSerializerIfRequired​(java.lang.Class type)
        Determines if this class requires the fall-back JavaSerializer. If the class does not require any specialized Java serialization features then null will be returned.
        Parameters:
        type - the type we wish to externalize
        Returns:
        a JavaSerializer if the type requires more than simple externalization.

      • getCachedSerializer

        private JavaSerializer getCachedSerializer​(java.lang.Class type)

      • isJavaSerializerRequired

        private boolean isJavaSerializerRequired​(java.lang.Class type)

      • hasInheritableReplaceMethod

        private static boolean hasInheritableReplaceMethod​(java.lang.Class type,
                                                   java.lang.String methodName)