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Server functionality for HBase

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/*
 * 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.master.procedure;

import org.apache.hadoop.hbase.master.procedure.PeerProcedureInterface.PeerOperationType;
import org.apache.hadoop.hbase.procedure2.LockStatus;
import org.apache.hadoop.hbase.procedure2.Procedure;
import org.apache.yetus.audience.InterfaceAudience;

@InterfaceAudience.Private
class PeerQueue extends Queue {

  public PeerQueue(String peerId, LockStatus lockStatus) {
    super(peerId, lockStatus);
  }

  @Override
  public boolean requireExclusiveLock(Procedure proc) {
    return requirePeerExclusiveLock((PeerProcedureInterface) proc);
  }

  private static boolean requirePeerExclusiveLock(PeerProcedureInterface proc) {
    // These procedures will only be used as sub procedures, and if they are scheduled, it always
    // means that the root procedure holds the xlock, so we do not need to hold any locks.
    return proc.getPeerOperationType() != PeerOperationType.REFRESH
      && proc.getPeerOperationType() != PeerOperationType.RECOVER_STANDBY
      && proc.getPeerOperationType() != PeerOperationType.SYNC_REPLICATION_REPLAY_WAL
      && proc.getPeerOperationType() != PeerOperationType.SYNC_REPLICATION_REPLAY_WAL_REMOTE;
  }
}