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.config;
  
  import static org.junit.Assert.assertEquals;
  
  import com.google.common.base.Objects;
  import java.io.File;
  import java.util.Optional;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.ScheduledThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  import org.apache.distributedlog.DistributedLogConfiguration;
  import org.apache.distributedlog.common.config.ConcurrentBaseConfiguration;
  import org.apache.distributedlog.common.config.ConcurrentConstConfiguration;
  import org.apache.distributedlog.common.config.PropertiesWriter;
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * TestDynamicConfigurationFactory.
   */
  public class TestDynamicConfigurationFactory {
      static final Logger LOG = LoggerFactory.getLogger(TestDynamicConfigurationFactory.class);
  
      private void waitForConfig(DynamicDistributedLogConfiguration conf, int value) throws Exception {
          while (!Objects.equal(conf.getRetentionPeriodHours(), value)) {
              Thread.sleep(100);
          }
      }
  
      private DynamicConfigurationFactory getConfigFactory(File configFile) {
          String streamConfigPath = configFile.getParent();
          ScheduledExecutorService executorService = new ScheduledThreadPoolExecutor(1);
          ConcurrentBaseConfiguration defaultConf = new ConcurrentConstConfiguration(new DistributedLogConfiguration());
          return new DynamicConfigurationFactory(executorService, 100, TimeUnit.MILLISECONDS);
      }
  
      private String getNamePart(File configFile) {
          String propsFilename = configFile.getName();
          return propsFilename.substring(0, propsFilename.indexOf(".conf"));
      }
  
      @Test(timeout = 60000)
      public void testGetDynamicConfigBasics() throws Exception {
          PropertiesWriter writer = new PropertiesWriter();
          DynamicConfigurationFactory factory = getConfigFactory(writer.getFile());
          Optional<DynamicDistributedLogConfiguration> conf = factory.getDynamicConfiguration(writer.getFile().getPath());
          assertEquals(DistributedLogConfiguration.BKDL_RETENTION_PERIOD_IN_HOURS_DEFAULT,
                  conf.get().getRetentionPeriodHours());
          writer.setProperty(DistributedLogConfiguration.BKDL_RETENTION_PERIOD_IN_HOURS, "1");
          writer.save();
          waitForConfig(conf.get(), 1);
          assertEquals(1, conf.get().getRetentionPeriodHours());
      }
  
      @Test(timeout = 60000)
      public void testGetDynamicConfigIsSingleton() throws Exception {
          PropertiesWriter writer = new PropertiesWriter();
          DynamicConfigurationFactory factory = getConfigFactory(writer.getFile());
          String configPath = writer.getFile().getPath();
          Optional<DynamicDistributedLogConfiguration> conf1 = factory.getDynamicConfiguration(configPath);
          Optional<DynamicDistributedLogConfiguration> conf2 = factory.getDynamicConfiguration(configPath);
          assertEquals(conf1, conf2);
      }
  
      /**
       * If the file is missing, get-config should not fail, and the file should be picked up if its added.
       * If the file is removed externally same should apply.
       */
      @Test(timeout = 60000)
      public void testMissingConfig() throws Exception {
          PropertiesWriter writer = new PropertiesWriter();
          DynamicConfigurationFactory factory = getConfigFactory(writer.getFile());
          Optional<DynamicDistributedLogConfiguration> conf = factory.getDynamicConfiguration(writer.getFile().getPath());
          writer.setProperty(DistributedLogConfiguration.BKDL_RETENTION_PERIOD_IN_HOURS, "1");
          writer.save();
          waitForConfig(conf.get(), 1);
          File configFile = writer.getFile();
          configFile.delete();
          Thread.sleep(1000);
          PropertiesWriter writer2 = new PropertiesWriter(writer.getFile());
          writer2.setProperty(DistributedLogConfiguration.BKDL_RETENTION_PERIOD_IN_HOURS, "2");
          writer2.save();
          waitForConfig(conf.get(), 2);
      }
  }
  