We use Kryo to pass query objects between hosts: https://github.com/EsotericSoftware/kryo
We initially had some trouble with it creating dynamic classes and running out of PermGen space but we got around that using an ObjectPool: http://commons.apache.org/proper/commons-pool/api-1.6/org/apache/commons/pool/impl/StackObjectPool.html I've not looked at the project recently, we're using version 2.21 and there's a 3.0.0 now, so they may have solved the issues we had and made things nicer, but here's how we're doing it with 2.21: To serialize: static private ObjectPool<Kryo> pool = new StackObjectPool<Kryo>(new KryoFactory(), 75, 75); ByteArrayOutputStream baos = new ByteArrayOutputStream(); Output output = new Output(baos); kryo = pool.borrowObject(); kryo.writeClassAndObject(output, query); pool.returnObject(kryo); output.close(); String base64EncodedSerializedObject = Base64.encodeBytes(baos.toByteArray()); Where query is a Lucene Query object (I've left out the error handling for brevity). To deserialize: ByteArrayInputStream bais = new ByteArrayInputStream(Base64.decode(encodedQuery)); Input input = new Input(bais); kryo = pool.borrowObject(); deserializedQueryObject = (Query) kryo.readClassAndObject(input); pool.returnObject(kryo); input.close(); Hope that might help. Jim ________________________________________ From: Bauer, Herbert S. (Scott) <bauer.sc...@mayo.edu> Sent: 18 March 2016 10:02 To: java-user@lucene.apache.org Subject: Serializing Queries Has anyone in this group solved the problem of serializing complex boolean queries (Some of our clauses have span and other query types)? Our Java RMI depends upon being able to do so. I have seen posts that say you can just parse the string representation but apparently that only works on simple query representations. I’m looking at the CoreParser and it’s supporting xml parsing capabilities with an eye toward Marshalling the boolean query into a DOM object and unmarshalling it on the server side using some of the support implied by the CoreParser and related classes. -scott --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
