/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.core;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.search.SolrIndexSearcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @version $Id: SolrEventListener.java 801417 2009-08-05 21:25:06Z gsingers $
*/
public interface SolrEventListener {
static final Logger log = LoggerFactory.getLogger(SolrCore.class);
public void init(NamedList args);
public void postCommit();
/** The searchers passed here are only guaranteed to be valid for the duration
* of this method call, so care should be taken not to spawn threads or asynchronous
* tasks with references to these searchers.
* <p/>
* Implementations should add the {@link org.apache.solr.common.params.EventParams#EVENT} parameter and set it to a value of either:
* <ul>
* <li>{@link org.apache.solr.common.params.EventParams#FIRST_SEARCHER} - First Searcher event</li>
* <li>{@link org.apache.solr.common.params.EventParams#NEW_SEARCHER} - New Searcher event</li>
* </ul>
*
* Sample:
* <pre>
if (currentSearcher != null) {
nlst.add(CommonParams.EVENT, CommonParams.NEW_SEARCHER);
} else {
nlst.add(CommonParams.EVENT, CommonParams.FIRST_SEARCHER);
}
*
* </pre>
*
* @see org.apache.solr.core.AbstractSolrEventListener#addEventParms(org.apache.solr.search.SolrIndexSearcher, org.apache.solr.common.util.NamedList)
*
* @param newSearcher The new {@link org.apache.solr.search.SolrIndexSearcher} to use
* @param currentSearcher The existing {@link org.apache.solr.search.SolrIndexSearcher}. null if this is a firstSearcher event.
*
*/
public void newSearcher(SolrIndexSearcher newSearcher, SolrIndexSearcher currentSearcher);
}
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