org.apache.jackrabbit.core.query.lucene
Class MultiIndex
java.lang.Object
org.apache.jackrabbit.core.query.lucene.MultiIndex
- public class MultiIndex
- extends Object
A MultiIndex
consists of a VolatileIndex
and multiple
PersistentIndex
es. The goal is to keep most parts of the index open
with index readers and write new index data to the volatile index. When
the volatile index reaches a certain size (see SearchIndex.setMinMergeDocs(int)
)
a new persistent index is created with the index data from the volatile index,
the same happens when the volatile index has been idle for some time (see
SearchIndex.setVolatileIdleTime(int)
).
The new persistent index is then added to the list of already existing
persistent indexes. Further operations on the new persistent index will
however only require an IndexReader
which serves for queries
but also for delete operations on the index.
The persistent indexes are merged from time to time. The merge behaviour
is configurable using the methods: SearchIndex.setMaxMergeDocs(int)
,
SearchIndex.setMergeFactor(int)
and SearchIndex.setMinMergeDocs(int)
.
For detailed description of the configuration parameters see also the lucene
IndexWriter
class.
This class is thread-safe.
Note on implementation: Multiple modifying threads are synchronized on a
MultiIndex
instance itself. Sychronization between a modifying
thread and reader threads is done using #updateMonitor
and
#updateInProgress
.
Nested Class Summary |
static class |
MultiIndex.Action
Defines an action on an MultiIndex . |
Method Summary |
org.apache.lucene.index.IndexReader |
getIndexReader()
Returns an read-only IndexReader that spans alls indexes of this
MultiIndex . |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
getIndexReader
public org.apache.lucene.index.IndexReader getIndexReader()
throws IOException
- Returns an read-only
IndexReader
that spans alls indexes of this
MultiIndex
.
- Returns:
- an
IndexReader
.
- Throws:
IOException
- if an error occurs constructing the IndexReader
.
Copyright © 2004-2006 The Apache Software Foundation. All Rights Reserved.