001/**
002
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUTKey WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020package org.apache.hadoop.hbase.procedure2;
021
022import org.apache.yetus.audience.InterfaceAudience;
023import org.apache.hadoop.hbase.procedure2.Procedure;
024
025import java.util.ArrayDeque;
026
027/**
028 * Type class.
029 * For conceptual purpose only. Seeing ProcedureDeque as type instead of just ArrayDeque gives
030 * more understanding that it's a queue of waiting procedures.
031 */
032@InterfaceAudience.Private
033public class ProcedureDeque extends ArrayDeque<Procedure> {
034  public ProcedureDeque() {
035    // Default is 16 for a list that is rarely used; elements will resize if too small.
036    super(2);
037  }
038}