de.pangaea.metadataportal.search
Class LuceneCache

java.lang.Object
  de.pangaea.metadataportal.search.LuceneCache

public final class LuceneCache
extends Object

Implementation of the caching algorithm behind the panFMP search engine. This class is for internal use only.

To configure the cache use the following search properties in your config file (these are the defaults):

<cacheMaxAge>300</cacheMaxAge>
<cacheMaxSessions>30</cacheMaxSessions>
<indexChangeCheckInterval>30</indexChangeCheckInterval>
<reloadIndexIfChangedAfter>60</reloadIndexIfChangedAfter>
<keepOldReaderAlive>60</keepOldReaderAlive>
<maxStoredQueries>200</maxStoredQueries>

Author:

Uwe Schindler

Nested Class Summary

protected static class

LuceneCache.Session Implementation of a cache entry.

Field Summary

Config	config
static int	DEFAULT_CACHE_MAX_AGE
static int	DEFAULT_CACHE_MAX_SESSIONS
static int	DEFAULT_FETCH_FACTOR
static int	DEFAULT_INDEX_CHANGE_CHECK_INTERVAL
static int	DEFAULT_KEEP_OLD_READER_ALIVE
static int	DEFAULT_MAX_STORED_QUERIES
static int	DEFAULT_RELOAD_AFTER
IndexReaderWarmerImpl	warmer

Method Summary

org.apache.lucene.document.FieldSelector	getFieldSelector(boolean loadXml, Collection<String> fieldsToLoad)
static LuceneCache	getInstance(String cfgFile)
LuceneCache.Session	getSession(IndexConfig index, org.apache.lucene.search.Query query, org.apache.lucene.search.Sort sort)
org.apache.lucene.search.Query	readStoredQuery(UUID uuid)
UUID	storeQuery(org.apache.lucene.search.Query query)

Methods inherited from class java.lang.Object

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

Field Detail

warmer

public final IndexReaderWarmerImpl warmer

config

public final Config config

DEFAULT_CACHE_MAX_AGE

public static final int DEFAULT_CACHE_MAX_AGE

See Also:

Constant Field Values

DEFAULT_INDEX_CHANGE_CHECK_INTERVAL

public static final int DEFAULT_INDEX_CHANGE_CHECK_INTERVAL

See Also:

Constant Field Values

DEFAULT_RELOAD_AFTER

public static final int DEFAULT_RELOAD_AFTER

See Also:

Constant Field Values

DEFAULT_KEEP_OLD_READER_ALIVE

public static final int DEFAULT_KEEP_OLD_READER_ALIVE

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Constant Field Values

DEFAULT_MAX_STORED_QUERIES

public static final int DEFAULT_MAX_STORED_QUERIES

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Constant Field Values

DEFAULT_CACHE_MAX_SESSIONS

public static final int DEFAULT_CACHE_MAX_SESSIONS

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Constant Field Values

DEFAULT_FETCH_FACTOR

public static final int DEFAULT_FETCH_FACTOR

See Also:

Constant Field Values

Method Detail

getInstance

public static LuceneCache getInstance(String cfgFile)
                               throws Exception

Throws:

Exception

storeQuery

public UUID storeQuery(org.apache.lucene.search.Query query)

readStoredQuery

public org.apache.lucene.search.Query readStoredQuery(UUID uuid)

getSession

public LuceneCache.Session getSession(IndexConfig index,
                                      org.apache.lucene.search.Query query,
                                      org.apache.lucene.search.Sort sort)
                               throws IOException

Throws:

IOException

getFieldSelector

public org.apache.lucene.document.FieldSelector getFieldSelector(boolean loadXml,
                                                                 Collection<String> fieldsToLoad)