com.spotify.scio.cassandra.CompatUtil Maven / Gradle / Ivy

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/*
 * Copyright 2017 Spotify AB.
 *
 * Licensed 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 com.spotify.scio.cassandra;

import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.CodecRegistry;
import com.datastax.driver.core.DataType;
import com.datastax.driver.core.ProtocolVersion;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import org.apache.cassandra.dht.Murmur3Partitioner;
import org.apache.cassandra.dht.RandomPartitioner;

/** Utilities to handle Datastax Java Driver compatibility issues. */
class CompatUtil {

  private static RandomPartitioner randomPartitioner = new RandomPartitioner();
  private static Murmur3Partitioner murmur3Partitioner = new Murmur3Partitioner();

  public static ProtocolVersion getProtocolVersion(Cluster cluster) {
    return cluster.getConfiguration().getProtocolOptions().getProtocolVersion();
  }

  public static  ByteBuffer serialize(
      DataType dataType, T value, ProtocolVersion protocolVersion) {
    return CodecRegistry.DEFAULT_INSTANCE
        .codecFor(dataType, value)
        .serialize(value, protocolVersion);
  }

  public static BigInteger maxToken(String partitioner) {
    switch (partitioner) {
      case "org.apache.cassandra.dht.RandomPartitioner":
        return RandomPartitioner.MAXIMUM.subtract(BigInteger.ONE);
      case "org.apache.cassandra.dht.Murmur3Partitioner":
        return BigInteger.valueOf(Murmur3Partitioner.MAXIMUM);
      default:
        throw new IllegalArgumentException("Unsupported partitioner " + partitioner);
    }
  }

  public static BigInteger minToken(String partitioner) {
    switch (partitioner) {
      case "org.apache.cassandra.dht.RandomPartitioner":
        return RandomPartitioner.ZERO;
      case "org.apache.cassandra.dht.Murmur3Partitioner":
        return BigInteger.valueOf((long) Murmur3Partitioner.MINIMUM.getTokenValue());
      default:
        throw new IllegalArgumentException("Unsupported partitioner " + partitioner);
    }
  }

  public static BigInteger getToken(String partitioner, ByteBuffer key) {
    switch (partitioner) {
      case "org.apache.cassandra.dht.RandomPartitioner":
        return randomPartitioner.getToken(key).getTokenValue();
      case "org.apache.cassandra.dht.Murmur3Partitioner":
        return BigInteger.valueOf((long) murmur3Partitioner.getToken(key).getTokenValue())
            .add(BigInteger.valueOf((long) Murmur3Partitioner.MINIMUM.getTokenValue()));
      default:
        throw new IllegalArgumentException("Unsupported partitioner " + partitioner);
    }
  }
}