/**
* 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 java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.lucene.index.IndexFileNameFilter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
public class RefCntRamDirectory extends RAMDirectory {
private final AtomicInteger refCount = new AtomicInteger();
public RefCntRamDirectory() {
super();
refCount.set(1);
}
public RefCntRamDirectory(Directory dir) throws IOException {
this();
IndexFileNameFilter filter = IndexFileNameFilter.getFilter();
for (String file : dir.listAll()) {
if (filter.accept(null, file)) {
dir.copy(this, file, file);
}
}
}
public void incRef() {
ensureOpen();
refCount.incrementAndGet();
}
public void decRef() {
ensureOpen();
if (refCount.getAndDecrement() == 1) {
super.close();
}
}
@Override
public final synchronized void close() {
decRef();
}
public boolean isOpen() {
return isOpen;
}
}