diff --git a/src/java/org/apache/cassandra/gms/PureRandom.java b/src/java/org/apache/cassandra/gms/PureRandom.java deleted file mode 100644 index 1bbc632614..0000000000 --- a/src/java/org/apache/cassandra/gms/PureRandom.java +++ /dev/null @@ -1,81 +0,0 @@ -/** - * 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.cassandra.gms; - -import java.util.BitSet; -import java.util.Random; - - -/** - * Implementation of a PureRandomNumber generator. Use this class cautiously. Not - * for general purpose use. Currently this is used by the Gossiper to choose a random - * endpoint to Gossip to. - */ - -class PureRandom extends Random -{ - private BitSet bs_ = new BitSet(); - private int lastUb_; - - PureRandom() - { - super(); - } - - public int nextInt(int ub) - { - if (ub <= 0) - throw new IllegalArgumentException("ub must be positive"); - - if ( lastUb_ != ub ) - { - bs_.clear(); - lastUb_ = ub; - } - else if(bs_.cardinality() == ub) - { - bs_.clear(); - } - - int value = super.nextInt(ub); - while ( bs_.get(value) ) - { - value = super.nextInt(ub); - } - bs_.set(value); - return value; - } - - public static void main(String[] args) throws Throwable - { - Random pr = new PureRandom(); - int ubs[] = new int[] { 2, 3, 1, 10, 5, 0}; - - for (int ub : ubs) - { - System.out.println("UB: " + String.valueOf(ub)); - for (int j = 0; j < 10; j++) - { - int junk = pr.nextInt(ub); - // Do something with junk so JVM doesn't optimize away - System.out.println(junk); - } - } - } -}