statefun-flink/statefun-flink-core/src/main/java/org/apache/flink/statefun/flink/core/functions/Partition.java

/*
 * 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.flink.statefun.flink.core.functions;

import static org.apache.flink.runtime.state.KeyGroupRangeAssignment.assignKeyToParallelOperator;

import org.apache.flink.statefun.flink.core.common.KeyBy;
import org.apache.flink.statefun.sdk.Address;

class Partition {
  private final int maxParallelism;
  private final int parallelism;
  private final int thisOperatorIndex;

  Partition(int maxParallelism, int parallelism, int thisOperatorIndex) {
    this.maxParallelism = maxParallelism;
    this.parallelism = parallelism;
    this.thisOperatorIndex = thisOperatorIndex;
  }

  boolean contains(Address address) {
    final int destinationOperatorIndex =
        assignKeyToParallelOperator(KeyBy.apply(address), maxParallelism, parallelism);
    return thisOperatorIndex == destinationOperatorIndex;
  }
}