/*
* 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.nifi.provenance.index.lucene;
import java.io.File;
import java.util.concurrent.TimeUnit;
import org.apache.nifi.provenance.index.EventIndexSearcher;
import org.apache.nifi.provenance.lucene.IndexManager;
import org.apache.nifi.provenance.util.DirectoryUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class LuceneCacheWarmer implements Runnable {
private static final Logger logger = LoggerFactory.getLogger(LuceneCacheWarmer.class);
private final File storageDir;
private final IndexManager indexManager;
public LuceneCacheWarmer(final File storageDir, final IndexManager indexManager) {
this.storageDir = storageDir;
this.indexManager = indexManager;
}
@Override
public void run() {
try {
final File[] indexDirs = storageDir.listFiles(DirectoryUtils.INDEX_FILE_FILTER);
if (indexDirs == null) {
logger.info("Cannot warm Lucene Index Cache for " + storageDir + " because the directory could not be read");
return;
}
logger.info("Beginning warming of Lucene Index Cache for " + storageDir);
final long startNanos = System.nanoTime();
for (final File indexDir : indexDirs) {
final long indexStartNanos = System.nanoTime();
final EventIndexSearcher eventSearcher = indexManager.borrowIndexSearcher(indexDir);
indexManager.returnIndexSearcher(eventSearcher);
final long indexWarmMillis = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - indexStartNanos);
logger.debug("Took {} ms to warm Lucene Index {}", indexWarmMillis, indexDir);
}
final long warmSecs = TimeUnit.NANOSECONDS.toSeconds(System.nanoTime() - startNanos);
logger.info("Finished warming all Lucene Indexes for {} in {} seconds", storageDir, warmSecs);
} catch (final Exception e) {
logger.error("Failed to warm Lucene Index Cache for " + storageDir, e);
}
}
}