content: /*
   * 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.distributedlog.injector;
  
  import org.apache.distributedlog.config.DynamicDistributedLogConfiguration;
  import org.apache.distributedlog.util.Utils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Injector that injects random delays.
   */
  public class RandomDelayFailureInjector implements FailureInjector {
  
      private static final Logger LOG = LoggerFactory.getLogger(RandomDelayFailureInjector.class);
  
      private final DynamicDistributedLogConfiguration dynConf;
  
      public RandomDelayFailureInjector(DynamicDistributedLogConfiguration dynConf) {
          this.dynConf = dynConf;
      }
  
      private int delayMs() {
          return dynConf.getEIInjectedWriteDelayMs();
      }
  
      private double delayPct() {
          return dynConf.getEIInjectedWriteDelayPercent();
      }
  
      private boolean enabled() {
          return delayMs() > 0 && delayPct() > 0;
      }
  
      @Override
      public void inject() {
          try {
              if (enabled() && Utils.randomPercent(delayPct())) {
                  Thread.sleep(delayMs());
              }
          } catch (InterruptedException ex) {
              Thread.currentThread().interrupt();
              LOG.warn("delay was interrupted ", ex);
          }
      }
  }
  