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Struts & Hibernate
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| | | - Batch Index using Hibernate Search and Seam | - Batch Index using Hibernate Search and Seam 2007-11-01 - By mat
Back
We need to index a large number of records using Hibernate Search;
Following the documentations and examples from SEAM, we have implemented the
followings. This is to eliminate Out Of Memory Exception and Timeout Exception
when indexing a large number of records.
The method works fine (well, haven?t tested it with a large number yet) when it
is called from a stateful seam component (as the backing bean for use actions).
However, since this would be a long running process we need to add the
@(protected) Adding this annotation stops the method after the EntityManager
call and log.info("EntityManager initilized."); is never called !
The persistence.xml has been modified for the specified batchSize as per
documentation.
Your help and feedback is highly appreciated;
Environment:
JBoss-4 (See http://oss-4.ora-code.com).2.1
SEAM-2 (See http://EAM-2.ora-code.com).0.CR1
RichFaces-3 (See http://ces-3.ora-code.com).1.2
| @(protected)("indexManager")
| public class IndexManagerBean {
|
| @(protected)
| static Log log;
|
| public int batchSize = 50;
|
|
| //@(protected)
| public void buildIndex(Class entityClass) {
| log.info("asynchronously rebuilding Lucene index for entity: " +
entityClass);
| EntityManager em = (EntityManager) Component.getInstance(
"entityManager");
| log.info("EntityManager initilized.");
| FullTextSession fullTextSession = (FullTextSession)em.getDelegate();
| fullTextSession.setFlushMode(FlushMode.MANUAL);
| fullTextSession.setCacheMode(CacheMode.IGNORE);
| org.hibernate.Transaction transaction = fullTextSession
.beginTransaction();
| //Scrollable results will avoid loading too many objects in memory
| ScrollableResults results = fullTextSession.createCriteria(
entityClass ).scroll( ScrollMode.FORWARD_ONLY);
| int index = 0;
| while( results.next() ) {
| index++;
| fullTextSession.index( results.get(0) ); //index each element
| if (index % batchSize == 0) fullTextSession.clear(); //clear
every batchSize since the queue is processed
| }
| transaction.commit();
|
| try {
| if (results != null) results.close();
| } catch (Exception ex) {
| ex.printStackTrace();
| }
| }
|
| }
|
|
The entityManager is configured in the components.xml as:
| <persistence:filter name="accessCompanyFilter">
| <persistence:name>accessCompanyFilter</persistence:name>
| <persistence:parameters>
| <key>currentAccessCompany</key>
| <value>#{currentAccessCompany}</value>
| </persistence:parameters>
| </persistence:filter>
|
| <persistence:managed-persistence-context name="entityManager"
| auto-create="true"
| entity-manager-factory="#
{TestEntityManagerFactory}"
| persistence-unit-jndi-name="java:/
TestEntityManagerFactory">
| <persistence:filters><value>#{accessCompanyFilter}</value><
/persistence:filters>
| </persistence:managed-persistence-context>
|
|
| <persistence:managed-persistence-context name="gloabalEntityManager"
| auto-create="true"
| entity-manager-factory="#{TestEntityManagerFactory}"
| persistence-unit-jndi-name="java:/TestEntityManagerFactory">
| </persistence:managed-persistence-context>
|
|
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&p=4101028#4101028
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