Class ExternalizableSerializer
- java.lang.Object
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- com.esotericsoftware.kryo.Serializer
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- com.esotericsoftware.kryo.serializers.ExternalizableSerializer
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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 standardJavaSerializer
if we detect either of these methods. Note that this class does not specialize the type onExternalizable
. That is because if we fall back on theJavaSerializer
it may have anreadResolve
method that returns an object of a different type.
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Field Summary
Fields Modifier and Type Field Description private ObjectMap<java.lang.Class,JavaSerializer>
javaSerializerByType
private KryoObjectInput
objectInput
private KryoObjectOutput
objectOutput
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Constructor Summary
Constructors Constructor Description ExternalizableSerializer()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description private JavaSerializer
getCachedSerializer(java.lang.Class type)
private JavaSerializer
getJavaSerializerIfRequired(java.lang.Class type)
Determines if this class requires the fall-backJavaSerializer
.private java.io.ObjectInput
getObjectInput(Kryo kryo, Input input)
private java.io.ObjectOutput
getObjectOutput(Kryo kryo, Output output)
private static boolean
hasInheritableReplaceMethod(java.lang.Class type, java.lang.String methodName)
private boolean
isJavaSerializerRequired(java.lang.Class type)
java.lang.Object
read(Kryo kryo, Input input, java.lang.Class type)
Reads bytes and returns a new object of the specified concrete type.private java.lang.Object
readExternal(Kryo kryo, Input input, java.lang.Class type)
void
write(Kryo kryo, Output output, java.lang.Object object)
Writes the bytes for the object to the output.private void
writeExternal(Kryo kryo, Output output, java.lang.Object object)
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Methods inherited from class com.esotericsoftware.kryo.Serializer
copy, getAcceptsNull, isImmutable, setAcceptsNull, setGenerics, setImmutable
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Field Detail
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javaSerializerByType
private ObjectMap<java.lang.Class,JavaSerializer> javaSerializerByType
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objectInput
private KryoObjectInput objectInput
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objectOutput
private KryoObjectOutput objectOutput
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Method Detail
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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 classSerializer
object
- May be null ifSerializer.getAcceptsNull()
is true.
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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 usesKryo
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 classSerializer
- Returns:
- May be null if
Serializer.getAcceptsNull()
is true.
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getJavaSerializerIfRequired
private JavaSerializer getJavaSerializerIfRequired(java.lang.Class type)
Determines if this class requires the fall-backJavaSerializer
. 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.
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getCachedSerializer
private JavaSerializer getCachedSerializer(java.lang.Class type)
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isJavaSerializerRequired
private boolean isJavaSerializerRequired(java.lang.Class type)
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hasInheritableReplaceMethod
private static boolean hasInheritableReplaceMethod(java.lang.Class type, java.lang.String methodName)
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