samza-sql/src/main/java/org/apache/samza/sql/interfaces/UdfResolver.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.samza.sql.interfaces;

import java.util.Collection;

/**
 * Plugin that is used to discover the UDFs available for the Samza SQL.
 */
public interface UdfResolver {

  /**
   * This method is called by the framework during initialization to fetch the {@link UdfMetadata} for all the UDFs
   * available in the system.
   * @return {@link UdfMetadata} for all the Udfs available in the system.
   */
  Collection<UdfMetadata> getUdfs();
}