| /* |
| * 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.stress.generate; |
| |
| import java.util.Set; |
| import java.util.TreeSet; |
| import java.util.concurrent.ConcurrentLinkedQueue; |
| |
| import com.datastax.driver.core.TokenRange; |
| import org.apache.cassandra.stress.settings.StressSettings; |
| |
| public class TokenRangeIterator |
| { |
| private final Set<TokenRange> tokenRanges; |
| private final ConcurrentLinkedQueue<TokenRange> pendingRanges; |
| private final boolean wrap; |
| |
| public TokenRangeIterator(StressSettings settings, Set<TokenRange> tokenRanges) |
| { |
| this.tokenRanges = maybeSplitRanges(tokenRanges, settings.tokenRange.splitFactor); |
| this.pendingRanges = new ConcurrentLinkedQueue<>(this.tokenRanges); |
| this.wrap = settings.tokenRange.wrap; |
| } |
| |
| private static Set<TokenRange> maybeSplitRanges(Set<TokenRange> tokenRanges, int splitFactor) |
| { |
| if (splitFactor <= 1) |
| return tokenRanges; |
| |
| Set<TokenRange> ret = new TreeSet<>(); |
| for (TokenRange range : tokenRanges) |
| ret.addAll(range.splitEvenly(splitFactor)); |
| |
| return ret; |
| } |
| |
| public void update() |
| { |
| // we may race and add to the queue twice but no bad consequence so it's fine if that happens |
| // as ultimately only the permits determine when to stop if wrap is true |
| if (wrap && pendingRanges.isEmpty()) |
| pendingRanges.addAll(tokenRanges); |
| } |
| |
| public TokenRange next() |
| { |
| return pendingRanges.poll(); |
| } |
| |
| public boolean exhausted() |
| { |
| return pendingRanges.isEmpty(); |
| } |
| } |