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Primarily used by jflyte, but can also be used to extend or build a jflyte alternative

There is a newer version: 0.4.60

/*
 * Copyright 2020-2023 Flyte Authors.
 *
 * 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 org.flyte.jflyte.utils;

import java.util.HashMap;
import java.util.Map;
import java.util.ServiceLoader;
import org.flyte.api.v1.Registrar;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** This class consists exclusively of static methods that operate on {@link Registrar}. */
public class Registrars {
  private static final Logger LOG = LoggerFactory.getLogger(Registrars.class);

  private Registrars() {
    throw new UnsupportedOperationException();
  }

  public static > Map loadAll(
      Class registrarClass, Map env) {
    ServiceLoader loader = ServiceLoader.load(registrarClass);

    LOG.info("Discovering " + registrarClass.getSimpleName());

    Map items = new HashMap<>();

    for (T registrar : loader) {
      LOG.info("Discovered [{}]", registrar.getClass().getName());

      for (Map.Entry entry : registrar.load(env).entrySet()) {
        V previous = items.put(entry.getKey(), entry.getValue());

        if (previous != null) {
          throw new IllegalArgumentException(
              String.format(
                  "Discovered a duplicate item [%s] [%s] [%s]",
                  entry.getKey(), entry.getValue(), previous));
        }
      }
    }

    return items;
  }
}