com.datastax.oss.driver.internal.core.metadata.token.RandomTokenRange Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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package com.datastax.oss.driver.internal.core.metadata.token;
import static com.datastax.oss.driver.internal.core.metadata.token.RandomTokenFactory.MAX_VALUE;
import com.datastax.oss.driver.api.core.metadata.token.Token;
import com.datastax.oss.driver.api.core.metadata.token.TokenRange;
import com.datastax.oss.driver.shaded.guava.common.collect.Lists;
import java.math.BigInteger;
import java.util.List;
import net.jcip.annotations.Immutable;
@Immutable
public class RandomTokenRange extends TokenRangeBase {
private static final BigInteger RING_LENGTH = MAX_VALUE.add(BigInteger.ONE);
public RandomTokenRange(RandomToken start, RandomToken end) {
super(start, end, RandomTokenFactory.MIN_TOKEN);
}
@Override
protected TokenRange newTokenRange(Token start, Token end) {
return new RandomTokenRange(((RandomToken) start), ((RandomToken) end));
}
@Override
protected List split(Token startToken, Token endToken, int numberOfSplits) {
// edge case: ]min, min] means the whole ring
if (startToken.equals(endToken) && startToken.equals(RandomTokenFactory.MIN_TOKEN)) {
endToken = RandomTokenFactory.MAX_TOKEN;
}
BigInteger start = ((RandomToken) startToken).getValue();
BigInteger end = ((RandomToken) endToken).getValue();
BigInteger range = end.subtract(start);
if (range.compareTo(BigInteger.ZERO) < 0) {
range = range.add(RING_LENGTH);
}
List values = super.split(start, range, MAX_VALUE, RING_LENGTH, numberOfSplits);
List tokens = Lists.newArrayListWithExpectedSize(values.size());
for (BigInteger value : values) {
tokens.add(new RandomToken(value));
}
return tokens;
}
}