org.elasticsearch.common.Names Maven / Gradle / Ivy
/*
* 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.common;
import jsr166y.ThreadLocalRandom;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Random;
import org.elasticsearch.common.io.Streams;
import com.google.common.base.Charsets;
/**
*
*/
public abstract class Names {
public static String randomNodeName(URL nodeNames) {
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(nodeNames.openStream(), Charsets.UTF_8));
int numberOfNames = 0;
while (reader.readLine() != null) {
numberOfNames++;
}
reader.close();
reader = new BufferedReader(new InputStreamReader(nodeNames.openStream(), Charsets.UTF_8));
int number = ((ThreadLocalRandom.current().nextInt(numberOfNames)) % numberOfNames);
for (int i = 0; i < number; i++) {
reader.readLine();
}
return reader.readLine();
} catch (IOException e) {
return null;
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
// ignore this exception
}
}
}
public static String randomNodeName(InputStream nodeNames) {
if (nodeNames == null) {
return null;
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(nodeNames, Charsets.UTF_8));
int numberOfNames = Integer.parseInt(reader.readLine());
int number = ((new Random().nextInt(numberOfNames)) % numberOfNames) - 2; // remove 2 for last line and first line
for (int i = 0; i < number; i++) {
reader.readLine();
}
return reader.readLine();
} catch (Exception e) {
return null;
} finally {
try {
nodeNames.close();
} catch (IOException e) {
// ignore
}
}
}
private Names() {
}
}