Proposal: ObjectField for storing and retrieving arbitrary serializable Objects
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Key: SOLR-328
URL: https://issues.apache.org/jira/browse/SOLR-328
Project: Solr
Issue Type: New Feature
Components: search
Affects Versions: 1.3
Reporter: Jonathan Woods
Priority: Minor
A while back I developed a means of storing and retrieving arbitrary Objects in
a Lucene Document [Field], and I thought that something similar might be useful
for Solr. Clearly, it will have more use in embedded Solr implementations, but
there's no reason why remote clients couldn't share Object implementations and
benefit too.
I wanted to attach a draft implementation of ObjectField, a subclass of
org.apache.solr.schema.FieldType, but I soon got lost in a sea of Solr Strings.
Instead, I've ended this message with code for getting and setting Object
values in Lucene Fields. Someone who's closer to Solr could easily include
this in an implementation of ObjectField.
The approach uses Java serialisation, which is often seen as fragile in the
sense that changes in class implementation can easily break the serialisation
format. However, imo that doesn't matter at all here: if a class's
implementation changes all you'd need to do is re-index; and in any case object
structure changes are nowhere near as common as object content changes, which
are bread and butter to Solr.
Comments welcomed. Oh, and since this is my first communication with Solr -
thanks to all concerned for a great piece of software.
Jon
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public static Object getObject(final Document document, final String fieldName)
{
final byte[] serialisation = document.getBinaryValue(fieldName);
try {
return new ObjectInputStream(new
ByteArrayInputStream(serialisation)).readObject();
}
catch (final Exception e) {
throw new SearchRuntimeException("While trying to deserialise
object from Field", e);
}
}
public static void indexObject(final Document document, final String fieldName,
final Serializable object, final boolean compress) throws IndexingException {
final ByteArrayOutputStream boas = new ByteArrayOutputStream();
try {
ObjectOutputStream oos = new ObjectOutputStream(boas);
oos.writeObject(object);
oos.close();
}
catch (IOException e) {
throw new IndexingException("On trying to serialise object", e);
}
document.add(new Field(fieldName, boas.toByteArray(), compress ?
Store.COMPRESS : Store.YES));
}
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