Actors in the Small 

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License: LGPL GitHub: Commits, Issues Free (Code): All Releases, All Announcements Google Group

Fast deserialization/reserialization is critical for databases. The key is to deserialize only what you need and to keep the serialized data for items that have not been changed for reserialization after an update.

Applications are built by subclassing existing JID actors and then composing more complex structures from them. The JID project includes a number of actors which support different types of persistent data.

Entries Balanced List Jid (BListJid) Balanced Map Jid (BMapJid)
1,000 .014 ms .027 ms
10,000 035 ms 056 ms
100,000 .24 ms .48 ms
1,000,000 2.9 ms 6.9ms

Times given above were for updating a byte array containing a serialized list or table, i.e. the time to deserialize, insert a new value (in the case of a list) and reserialize. (Test Machine: i7-3770 @ 3.40 GHz, ASUS P8Z77-M Motherboard, 16 GB Corsair DDR3 1600 MHz RAM and Vertex 3 SATA III SSD)
Available on The (Maven) Central Repository, so Maven users just need to add this to their POM file:


(Be sure to update the version number appropriately, of course.)

Dependencies: Java 6, slf4j, JActor

Dependent Projects


  • The problem with Java Serialization
    There are a number of problems with Java serialization and numerous alternatives have been developed. But my focus here is on a particular use case, databases, and a single issue, performance… more
  • Introducing JID
    Java Incremental Deserialization/reserialization (JID) provides a near-ideal solution for updating serialized data structures… more
  • Getting Started with JID
    How to set up a test environment for working with JID and the RootJid API… more
  • Custom Jid Classes
    How to create application classes that are serializable with JID… more
  • BListJid, ActorJid and UnionJid
    For high-performance, array-backed data structures are generally recommended. On the other hand, inserting into a large array isn’t the fastest thing. BListJid uses small arrays… more
  • BMapJid
    BMapJid is the base class for balanced tree maps which, like bListJid, provide for super-fast incremental deserialization and reserialization… more
  • Jid Objects are Actors
    All Jid objects have the same superclass, Jid, which in turn is a subclass of JLPCActor, which means that all Jid objects are actors… more
  • Deep Copy
    When deserialization and reserialization are reasonably fast, their use to make deep copies of data structures becomes a reasonable approach. And Jid provides the CopyJid request, which is supported by all Jid actors… more


Slides Incremental Java Deserialization/Reserialization Incremental Java Deserialization/Reserialization from laforge49

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