/**
 * 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.hadoop.hbase.procedure;

import org.apache.hadoop.hbase.classification.InterfaceAudience;

/**
 * Task builder to build instances of a {@link ProcedureMember}'s {@link Subprocedure}s.
 */
@InterfaceAudience.Private
public interface SubprocedureFactory {

  /**
   * Build {@link Subprocedure} when requested.
   * @param procName name of the procedure associated with this subprocedure
   * @param procArgs  arguments passed from the coordinator about the procedure
   * @return {@link Subprocedure} to run or <tt>null</tt> if the no operation should be run
   * @throws IllegalArgumentException if the operation could not be run because of errors in the
   *           request
   * @throws IllegalStateException if the current runner cannot accept any more new requests
   */
  Subprocedure buildSubprocedure(String procName, byte[] procArgs);
}