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Tooling for reactive Domain-Driven Design projects that are highly concurrent. Includes compute grid, actor caching, spaces, cross-node cluster messaging, CQRS, and Event Sourcing support.

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// Copyright © 2012-2020 VLINGO LABS. All rights reserved.
//
// This Source Code Form is subject to the terms of the
// Mozilla Public License, v. 2.0. If a copy of the MPL
// was not distributed with this file, You can obtain
// one at https://mozilla.org/MPL/2.0/.

package io.vlingo.lattice.grid.hashring;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.function.BiFunction;

public abstract class MD5HashRing implements HashRing {
  protected final BiFunction> factory;
  protected final MessageDigest hasher;
  protected final int pointsPerNode;

  protected MD5HashRing(final int pointsPerNode, final BiFunction> factory) throws Exception {
    this.pointsPerNode = pointsPerNode;
    this.factory = factory;
    this.hasher = MessageDigest.getInstance("MD5");
  }

  protected int hashed(final Object id) {
    hasher.reset();
    hasher.update(StandardCharsets.UTF_8.encode(id.toString()));
    final int hash = Arrays.hashCode(hasher.digest());
    return hash;
  }

  protected HashedNodePoint hashedNodePointOf(final Object id) {
    final HashedNodePoint hashedNodePointOf = factory.apply(hashed(id), null);
    return hashedNodePointOf;
  }
}