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 * 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
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * KIND, either express or implied.  See the License for the
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package org.apache.sshd.common.random;

import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.common.Random;

 * A random factory wrapper that uses a single random instance.
 * The underlying random instance has to be thread safe.
 * @author <a href="">Apache MINA SSHD Project</a>

public class SingletonRandomFactory implements Random, NamedFactory<Random> {

    private final NamedFactory<Random> factory;
    private final Random random;

    public SingletonRandomFactory(NamedFactory<Random> factory) {
        this.factory = factory;
        this.random = factory.create();

    public void fill(byte[] bytes, int start, int len) {
        random.fill(bytes, start, len);

    public int random(int max) {
        return random.random(max);

    public String getName() {
        return factory.getName();

    public Random create() {
        return this;