/*
* JBoss, Home of Professional Open Source
* Copyright 2010 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt in the distribution for a full listing of
* individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.infinispan.lucene;
import java.util.Set;
import org.infinispan.AdvancedCache;
import org.infinispan.context.Flag;
import org.infinispan.util.concurrent.ConcurrentHashSet;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* Collects operations on the existing fileList, stored as a Set<String> having key
* of type FileListCacheKey(indexName).
*
* @author Sanne Grinovero
* @since 4.1
*/
@SuppressWarnings("unchecked")
final class FileListOperations {
private static final Log log = LogFactory.getLog(InfinispanIndexOutput.class);
private static final boolean trace = log.isTraceEnabled();
private final FileListCacheKey fileListCacheKey;
private final AdvancedCache<FileListCacheKey, Object> cache;
private final String indexName;
private final AdvancedCache<FileListCacheKey, Set<String>> cacheNoRetrieve;
FileListOperations(AdvancedCache<?, ?> cache, String indexName){
this.cache = (AdvancedCache<FileListCacheKey, Object>) cache;
this.cacheNoRetrieve = (AdvancedCache<FileListCacheKey, Set<String>>) cache.withFlags(Flag.SKIP_REMOTE_LOOKUP, Flag.SKIP_CACHE_LOAD);
this.indexName = indexName;
this.fileListCacheKey = new FileListCacheKey(indexName);
}
/**
* @return the current list of files being part of the index
*/
Set<String> getFileList() {
Set<String> fileList = (Set<String>) cache.get(fileListCacheKey);
if (fileList == null) {
fileList = new ConcurrentHashSet<String>();
Set<String> prev = (Set<String>) cache.putIfAbsent(fileListCacheKey, fileList);
if ( prev != null ) {
fileList = prev;
}
}
if (trace)
log.trace("Refreshed file listing view");
return fileList;
}
/**
* Deleted a file from the list of files actively part of the index
* @param fileName
*/
void deleteFileName(String fileName) {
Set<String> fileList = getFileList();
boolean done = fileList.remove(fileName);
if (done) {
cacheNoRetrieve.put(fileListCacheKey, fileList);
if (trace)
log.trace("Updated file listing: removed " + fileName);
}
}
/**
* Adds a new fileName in the list of files making up this index
* @param fileName
*/
void addFileName(String fileName) {
Set<String> fileList = getFileList();
boolean done = fileList.add(fileName);
if (done) {
cacheNoRetrieve.put(fileListCacheKey, fileList);
if (trace)
log.trace("Updated file listing: added " + fileName);
}
}
/**
* @param fileName
* @return the FileMetadata associated with the fileName, or null if the file wasn't found.
*/
FileMetadata getFileMetadata(String fileName) {
FileCacheKey key = new FileCacheKey(indexName, fileName);
FileMetadata metadata = (FileMetadata) cache.get(key);
return metadata;
}
/**
* Optimized implementation to perform both a remove and an add
* @param toRemove
* @param toAdd
*/
void removeAndAdd(String toRemove, String toAdd) {
Set<String> fileList = getFileList();
boolean doneAdd = fileList.add(toAdd);
boolean doneRemove = fileList.remove(toRemove);
if (doneAdd || doneRemove) {
cacheNoRetrieve.put(fileListCacheKey, fileList);
if (trace) {
if (doneAdd) log.trace("Updated file listing: added " + toAdd);
if (doneRemove) log.trace("Updated file listing: removed " + toRemove);
}
}
}
}