com.datastax.oss.driver.internal.core.metadata.token.LocalReplicationStrategy Maven / Gradle / Ivy

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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
 *
 *     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.datastax.oss.driver.internal.core.metadata.token;

import com.datastax.oss.driver.api.core.metadata.Node;
import com.datastax.oss.driver.api.core.metadata.token.Token;
import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableMap;
import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import net.jcip.annotations.ThreadSafe;

@ThreadSafe
class LocalReplicationStrategy implements ReplicationStrategy {

  @Override
  public Map> computeReplicasByToken(
      Map tokenToPrimary, List ring) {
    ImmutableMap.Builder> result = ImmutableMap.builder();
    // Each token maps to exactly one node
    for (Map.Entry entry : tokenToPrimary.entrySet()) {
      result.put(entry.getKey(), ImmutableSet.of(entry.getValue()));
    }
    return result.build();
  }
}