/*
 * 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.File;
import java.io.IOException;

import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.LockFactory;
import org.apache.lucene.store.NRTCachingDirectory;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;

/**
 * Factory to instantiate {@link org.apache.lucene.store.NRTCachingDirectory}
 */
public class NRTCachingDirectoryFactory extends StandardDirectoryFactory {
  public static final int DEFAULT_MAX_MERGE_SIZE_MB = 4;
  private double maxMergeSizeMB = DEFAULT_MAX_MERGE_SIZE_MB;
  public static final int DEFAULT_MAX_CACHED_MB = 48;
  private double maxCachedMB = DEFAULT_MAX_CACHED_MB;

  @Override
  public void init(NamedList args) {
    super.init(args);
    SolrParams params = args.toSolrParams();
    maxMergeSizeMB = params.getDouble("maxMergeSizeMB", DEFAULT_MAX_MERGE_SIZE_MB);
    if (maxMergeSizeMB <= 0){
      throw new IllegalArgumentException("maxMergeSizeMB must be greater than 0");
    }
    maxCachedMB = params.getDouble("maxCachedMB", DEFAULT_MAX_CACHED_MB);
    if (maxCachedMB <= 0){
      throw new IllegalArgumentException("maxCachedMB must be greater than 0");
    }
  }

  @Override
  protected Directory create(String path, LockFactory lockFactory, DirContext dirContext) throws IOException {
    // we pass NoLockFactory, because the real lock factory is set later by injectLockFactory:
    return new NRTCachingDirectory(FSDirectory.open(new File(path).toPath(), lockFactory), maxMergeSizeMB, maxCachedMB);
  }
  
  @Override
  public boolean isAbsolute(String path) {
    return new File(path).isAbsolute();
  }

}
