code: /**
   * This file is part of Eclipse Steady.
   *
   * Licensed 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.
   *
   * SPDX-License-Identifier: Apache-2.0
   * SPDX-FileCopyrightText: Copyright (c) 2018-2020 SAP SE or an SAP affiliate company and Eclipse Steady contributors
   */
  package org.eclipse.steady.backend.requests;
  
  import org.apache.logging.log4j.Logger;
  
  /**
   * Used to repeat HTTP requests for a certain number of times.
   */
  public class RequestRepeater {
  
    private static final Logger log =
        org.apache.logging.log4j.LogManager.getLogger(RequestRepeater.class);
  
    private long failCount = 0;
    private long max = 50;
    private long waitMilli = 60000;
  
    /**
     * <p>Constructor for RequestRepeater.</p>
     *
     * @param _max a long.
     * @param _milli a long.
     */
    public RequestRepeater(long _max, long _milli) {
      this.max = _max;
      this.waitMilli = _milli;
    }
  
    /**
     * Returns true (and waits {@link RequestRepeater#waitMilli} milliseconds) if the response code of the previous HTTP call was 503
     * and the number of maximum retries has not been reached, false otherwise.
     *
     * @param _503 a boolean.
     * @return a boolean.
     */
    public boolean repeat(boolean _503) {
  
      // Don't wait and repeat if the HTTP response code was NE 503
      if (!_503) return false;
      // Else check whether we reached the max. no. of retries
      else {
        this.failCount++;
        if (this.failCount < this.max) {
          log.info(
              "Retry ["
                  + this.failCount
                  + "/"
                  + this.max
                  + "] in ["
                  + this.waitMilli / 1000
                  + "] seconds");
          try {
            Thread.sleep(this.waitMilli);
          } catch (InterruptedException e) {
            log.error("Interrupted: " + e.getMessage());
          }
          return true;
        } else {
          return false;
        }
      }
    }
  }
  