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.impl;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import com.google.common.collect.Sets;
  import java.net.URI;
  import java.util.Optional;
  import java.util.Set;
  import org.apache.bookkeeper.common.util.OrderedScheduler;
  import org.apache.distributedlog.DistributedLogConfiguration;
  import org.apache.distributedlog.TestDistributedLogBase;
  import org.apache.distributedlog.TestZooKeeperClientBuilder;
  import org.apache.distributedlog.ZooKeeperClient;
  import org.apache.distributedlog.util.Utils;
  import org.apache.zookeeper.CreateMode;
  import org.apache.zookeeper.ZooDefs;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TestName;
  
  /**
   * Test ZK based metadata store.
   */
  public class TestZKLogMetadataStore extends TestDistributedLogBase {
  
      private static final  int zkSessionTimeoutMs = 2000;
  
      @Rule
      public TestName runtime = new TestName();
      protected final DistributedLogConfiguration baseConf =
              new DistributedLogConfiguration();
      protected ZooKeeperClient zkc;
      protected ZKLogMetadataStore metadataStore;
      protected OrderedScheduler scheduler;
      protected URI uri;
  
      @Before
      public void setup() throws Exception {
          zkc = TestZooKeeperClientBuilder.newBuilder()
                  .uri(createDLMURI("/"))
                  .sessionTimeoutMs(zkSessionTimeoutMs)
                  .build();
          scheduler = OrderedScheduler.newSchedulerBuilder()
                  .name("test-zk-logmetadata-store")
                  .numThreads(1)
                  .build();
          DistributedLogConfiguration conf = new DistributedLogConfiguration();
          conf.addConfiguration(baseConf);
          this.uri = createDLMURI("/" + runtime.getMethodName());
          metadataStore = new ZKLogMetadataStore(conf, uri, zkc, scheduler);
      }
  
      @After
      public void teardown() throws Exception {
          if (null != zkc) {
              zkc.close();
          }
          if (null != scheduler) {
              scheduler.shutdown();
          }
      }
  
      private void createLogInNamespace(URI uri, String logName) throws Exception {
          String logPath = uri.getPath() + "/" + logName;
          Utils.zkCreateFullPathOptimistic(zkc, logPath, new byte[0],
                  ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
      }
  
      @Test(timeout = 60000)
      public void testCreateLog() throws Exception {
          assertEquals(uri, Utils.ioResult(metadataStore.createLog("test")));
      }
  
      @Test(timeout = 60000)
      public void testGetLogLocation() throws Exception {
          Optional<URI> uriOptional = Utils.ioResult(metadataStore.getLogLocation("test"));
          assertTrue(uriOptional.isPresent());
          assertEquals(uri, uriOptional.get());
      }
  
      @Test(timeout = 60000)
      public void testGetLogs() throws Exception {
          Set<String> logs = Sets.newHashSet();
          for (int i = 0; i < 10; i++) {
              String logName = "test-" + i;
              logs.add(logName);
              createLogInNamespace(uri, logName);
          }
          Set<String> result = Sets.newHashSet(Utils.ioResult(metadataStore.getLogs("")));
          assertEquals(10, result.size());
          assertTrue(Sets.difference(logs, result).isEmpty());
      }
  
      @Test(timeout = 60000)
      public void testGetLogsPrefix() throws Exception {
          Set<String> logs = Sets.newHashSet();
          for (int i = 0; i < 10; i++) {
              String logName = "test-" + i;
              logs.add(logName);
              createLogInNamespace(uri, "test/" + logName);
          }
          Set<String> result = Sets.newHashSet(Utils.ioResult(metadataStore.getLogs("test")));
          assertEquals(10, result.size());
          assertTrue(Sets.difference(logs, result).isEmpty());
      }
  }
  