org.elasticsearch.index.store.distributor.AbstractDistributor Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of elasticsearch

ElasticSearch - Open Source, Distributed, RESTful Search Engine

There is a newer version: 8.14.1

/*
 * Licensed to ElasticSearch and Shay Banon 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.distributor;

import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.RateLimitedFSDirectory;
import org.elasticsearch.index.store.DirectoryService;

import java.io.IOException;
import java.util.Arrays;

public abstract class AbstractDistributor implements Distributor {

    protected final Directory[] delegates;

    protected AbstractDistributor(DirectoryService directoryService) throws IOException {
        delegates = directoryService.build();
    }

    public Directory[] all() {
        return delegates;
    }

    @Override
    public Directory primary() {
        return delegates[0];
    }

    @Override
    public Directory any() {
        if (delegates.length == 1) {
            return delegates[0];
        } else {
            return doAny();
        }
    }

    protected long getUsableSpace(Directory directory) {
        if (directory instanceof RateLimitedFSDirectory) {
            return ((RateLimitedFSDirectory) directory).wrappedDirectory().getDirectory().getUsableSpace();
        } else if (directory instanceof FSDirectory) {
            return ((FSDirectory) directory).getDirectory().getUsableSpace();
        } else {
            return 0;
        }
    }

    @Override
    public String toString() {
        return name() + Arrays.toString(delegates);
    }

    protected abstract Directory doAny();

    protected abstract String name();

}