Package org.apache.jackrabbit.oak.index.indexer.document.flatfile.pipelined

Class NodeDocumentCodec

java.lang.Object

org.apache.jackrabbit.oak.index.indexer.document.flatfile.pipelined.NodeDocumentCodec

All Implemented Interfaces:

org.bson.codecs.Codec<NodeDocument>, org.bson.codecs.Decoder<NodeDocument>, org.bson.codecs.Encoder<NodeDocument>

public class NodeDocumentCodec
extends java.lang.Object
implements org.bson.codecs.Codec<NodeDocument>

Custom codec for MongoDB to transform a stream of BSON tokens into a NodeDocument. This custom codec provides two benefits compared to using a standard Mongo codec.

• The standard codecs produce objects from the Mongo client API (BasicDBObject or BsonDocument or Document) which have then to be converted into NodeDocuments (OAK API). This custom codec creates directly a NodeDocument, thereby skipping the intermediate object. This should be more efficient and reduce the pressure on the GC.
• Allows estimating the size of the document while reading it, which will have a negligible overhead (as compared with doing an additional traverse of the object structure to compute the size).

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	SIZE_FIELD

Constructor Summary

Constructors

Constructor	Description
NodeDocumentCodec(MongoDocumentStore store, Collection<NodeDocument> collection, org.bson.codecs.configuration.CodecRegistry defaultRegistry)

Method Summary

Modifier and Type	Method	Description
NodeDocument	decode(org.bson.BsonReader reader, org.bson.codecs.DecoderContext decoderContext)
void	encode(org.bson.BsonWriter writer, NodeDocument value, org.bson.codecs.EncoderContext encoderContext)
java.lang.Class<NodeDocument>	getEncoderClass()

Methods inherited from class java.lang.Object

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

Field Detail

SIZE_FIELD

public static final java.lang.String SIZE_FIELD

See Also:

Constant Field Values

Constructor Detail

NodeDocumentCodec

public NodeDocumentCodec(MongoDocumentStore store,
                         Collection<NodeDocument> collection,
                         org.bson.codecs.configuration.CodecRegistry defaultRegistry)

Method Detail

decode

public NodeDocument decode(org.bson.BsonReader reader,
                           org.bson.codecs.DecoderContext decoderContext)

Specified by:

decode in interface org.bson.codecs.Decoder<NodeDocument>

encode

public void encode(org.bson.BsonWriter writer,
                   NodeDocument value,
                   org.bson.codecs.EncoderContext encoderContext)

Specified by:

encode in interface org.bson.codecs.Encoder<NodeDocument>

getEncoderClass

public java.lang.Class<NodeDocument> getEncoderClass()

Specified by:

getEncoderClass in interface org.bson.codecs.Encoder<NodeDocument>