org.apereo.cas.memcached.kryo

Class CasKryoTranscoder

java.lang.Object

org.apereo.cas.memcached.kryo.CasKryoTranscoder

All Implemented Interfaces:

net.spy.memcached.transcoders.Transcoder<java.lang.Object>

public class CasKryoTranscoder
extends java.lang.Object
implements net.spy.memcached.transcoders.Transcoder<java.lang.Object>

MemcachedClient transcoder implementation based on Kryo fast serialization framework suited for efficient serialization of tickets.

We can’t use an auto-register type approach, because the sequence of class registration has to be deterministic. So – for example – if we register in the sequence in which we encounter classes, then if you have two (or more) instances of CAS running (e.g. for HA or horizontal scaling), then they would likely register classes in a different sequence. The sequence is a factor in assigning an internal Kryo integer id to each class. And, Kryo serializes be embedding that class id into the object, rather than the class name (makes for a much smaller serialized entity). So – if the same class gets registered in both instances, but get different id’s, then the same cached object would deserialize differently (if we’re lucky it would throw an exception, if we’re unlucky it would contain bad data). Or – a class gets registered in one instance, but not the other. So – it needs to be pre-registered, and in a deterministic sequence.

Since:

3.0.0

Constructor Summary

Constructors

Constructor and Description
CasKryoTranscoder()

Method Summary

Modifier and Type	Method and Description
boolean	asyncDecode(net.spy.memcached.CachedData d) Asynchronous decoding is not supported.
java.lang.Object	decode(net.spy.memcached.CachedData d)
net.spy.memcached.CachedData	encode(java.lang.Object obj)
CloseableKryo	getKryo() Gets kryo.
int	getMaxSize() Maximum size of encoded data supported by this transcoder.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CasKryoTranscoder

public CasKryoTranscoder()

Method Detail

asyncDecode

public boolean asyncDecode(net.spy.memcached.CachedData d)

Asynchronous decoding is not supported.

Specified by:

asyncDecode in interface net.spy.memcached.transcoders.Transcoder<java.lang.Object>

Parameters:

d - Data to decode.

Returns:

false.

encode

public net.spy.memcached.CachedData encode(java.lang.Object obj)

Specified by:

encode in interface net.spy.memcached.transcoders.Transcoder<java.lang.Object>

decode

public java.lang.Object decode(net.spy.memcached.CachedData d)

Specified by:

decode in interface net.spy.memcached.transcoders.Transcoder<java.lang.Object>

getMaxSize

public int getMaxSize()

Maximum size of encoded data supported by this transcoder.

Specified by:

getMaxSize in interface net.spy.memcached.transcoders.Transcoder<java.lang.Object>

Returns:

net.spy.memcached.CachedData#MAX_SIZE.

getKryo

public CloseableKryo getKryo()

Gets kryo.

Returns:

the kryo