/**
 * 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;
      }
    }
  }
}
