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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.store.fs;
import org.apache.lucene.store.*;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.common.metrics.CounterMetric;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.settings.IndexSettings;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.store.DirectoryService;
import org.elasticsearch.index.store.DirectoryUtils;
import org.elasticsearch.index.store.IndexStore;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
/**
*/
public abstract class FsDirectoryService extends DirectoryService implements StoreRateLimiting.Listener, StoreRateLimiting.Provider {
protected final FsIndexStore indexStore;
private final CounterMetric rateLimitingTimeInNanos = new CounterMetric();
public FsDirectoryService(ShardId shardId, @IndexSettings Settings indexSettings, IndexStore indexStore) {
super(shardId, indexSettings);
this.indexStore = (FsIndexStore) indexStore;
}
@Override
public long throttleTimeInNanos() {
return rateLimitingTimeInNanos.count();
}
@Override
public StoreRateLimiting rateLimiting() {
return indexStore.rateLimiting();
}
public static LockFactory buildLockFactory(@IndexSettings Settings indexSettings) throws IOException {
String fsLock = indexSettings.get("index.store.fs.lock", indexSettings.get("index.store.fs.fs_lock", "native"));
LockFactory lockFactory = NoLockFactory.getNoLockFactory();
if (fsLock.equals("native")) {
lockFactory = new NativeFSLockFactory();
} else if (fsLock.equals("simple")) {
lockFactory = new SimpleFSLockFactory();
} else if (fsLock.equals("none")) {
lockFactory = NoLockFactory.getNoLockFactory();
}
return lockFactory;
}
@Override
public final void renameFile(Directory dir, String from, String to) throws IOException {
final FSDirectory fsDirectory = DirectoryUtils.getLeaf(dir, FSDirectory.class);
if (fsDirectory == null) {
throw new ElasticsearchIllegalArgumentException("Can not rename file on non-filesystem based directory ");
}
File directory = fsDirectory.getDirectory();
File old = new File(directory, from);
File nu = new File(directory, to);
if (nu.exists())
if (!nu.delete())
throw new IOException("Cannot delete " + nu);
if (!old.exists()) {
throw new FileNotFoundException("Can't rename from [" + from + "] to [" + to + "], from does not exists");
}
boolean renamed = false;
for (int i = 0; i < 3; i++) {
if (old.renameTo(nu)) {
renamed = true;
break;
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
}
}
if (!renamed) {
throw new IOException("Failed to rename, from [" + from + "], to [" + to + "]");
}
}
@Override
public Directory[] build() throws IOException {
Path[] locations = indexStore.shardIndexLocations(shardId);
Directory[] dirs = new Directory[locations.length];
for (int i = 0; i < dirs.length; i++) {
Files.createDirectories(locations[i]);
Directory wrapped = newFSDirectory(locations[i].toFile(), buildLockFactory(indexSettings));
dirs[i] = new RateLimitedFSDirectory(wrapped, this, this) ;
}
return dirs;
}
protected abstract Directory newFSDirectory(File location, LockFactory lockFactory) throws IOException;
@Override
public void onPause(long nanos) {
rateLimitingTimeInNanos.inc(nanos);
}
}