/*
* Hibernate Search, full-text search for your domain model
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.search.test.shards;
import java.io.Serializable;
import java.util.Properties;
import org.apache.lucene.document.Document;
import org.hibernate.search.filter.FullTextFilter;
import org.hibernate.search.filter.FullTextFilterImplementor;
import org.hibernate.search.indexes.spi.IndexManager;
import org.hibernate.search.store.IndexShardingStrategy;
/**
* Shards an index containing data for multiple customers by customerID. customerID is
* provided as a property on all indexes entities, and is also defined as a Filter.
*
* The number of shards should be configured to be MAX(customerID).
*
* @author Chase Seibert
*/
public class CustomerShardingStrategy implements IndexShardingStrategy {
// stored IndexManagers in a array indexed by customerID
private IndexManager[] indexManagers;
@Override
public void initialize(Properties properties, IndexManager[] indexManagers) {
this.indexManagers = indexManagers;
}
@Override
public IndexManager[] getIndexManagersForAllShards() {
return indexManagers;
}
@Override
public IndexManager getIndexManagerForAddition(Class<?> entity, Serializable id, String idInString, Document document) {
final String stringValueId = document.getField( "customerID" ).stringValue();
final Integer customerID = Integer.parseInt( stringValueId );
return indexManagers[customerID];
}
@Override
public IndexManager[] getIndexManagersForDeletion(Class<?> entity, Serializable id, String idInString) {
return getIndexManagersForAllShards();
}
/**
* Optimization; don't search ALL shards and union the results; in this case, we
* can be certain that all the data for a particular customer Filter is in a single
* shard; simply return that shard by customerID.
*/
@Override
public IndexManager[] getIndexManagersForQuery(FullTextFilterImplementor[] filters) {
FullTextFilter filter = getCustomerFilter( filters, "customer" );
if ( filter == null ) {
return getIndexManagersForAllShards();
}
else {
return new IndexManager[] { indexManagers[Integer.parseInt( filter.getParameter( "customerID" ).toString() )] };
}
}
private FullTextFilter getCustomerFilter(FullTextFilterImplementor[] filters, String name) {
for ( FullTextFilterImplementor filter: filters ) {
if ( filter.getName().equals( name ) ) {
return filter;
}
}
return null;
}
}