RetryUtils.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.twill.internal.zookeeper;

import org.apache.zookeeper.KeeperException;

/**
 * Utility class for help determining operation retry condition.
 */
final class RetryUtils {

  /**
   * Tells if a given operation error code can be retried or not.
   * @param code The error code of the operation.
   * @return {@code true} if the operation can be retried.
   */
  public static boolean canRetry(KeeperException.Code code) {
    return (code == KeeperException.Code.CONNECTIONLOSS
          || code == KeeperException.Code.OPERATIONTIMEOUT
          || code == KeeperException.Code.SESSIONEXPIRED
          || code == KeeperException.Code.SESSIONMOVED);
  }

  /**
   * Tells if a given operation exception can be retried or not.
   * @param t The exception raised by an operation.
   * @return {@code true} if the operation can be retried.
   */
  public static boolean canRetry(Throwable t) {
    return t instanceof KeeperException && canRetry(((KeeperException) t).code());
  }

  private RetryUtils() {
  }
}