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.bookkeeper.stream.storage.impl.cluster;
  
  import static org.junit.Assert.assertEquals;
  
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.TimeUnit;
  import java.util.function.Consumer;
  import lombok.Cleanup;
  import org.apache.bookkeeper.common.concurrent.FutureUtils;
  import org.apache.bookkeeper.stream.proto.cluster.ClusterAssignmentData;
  import org.apache.bookkeeper.stream.proto.cluster.ClusterMetadata;
  import org.apache.bookkeeper.stream.proto.cluster.ServerAssignmentData;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Unit test {@link InMemClusterMetadataStore}.
   */
  public class InMemClusterMetadataStoreTest {
  
      private static final int NUM_STORAGE_CONTAINERS = 1024;
  
      private InMemClusterMetadataStore store;
  
      @Before
      public void setup() {
          store = new InMemClusterMetadataStore(NUM_STORAGE_CONTAINERS);
      }
  
      @After
      public void teardown() {
          if (null != store) {
              store.close();
          }
      }
  
      @Test
      public void testUninitialized() {
          assertEquals(
              ClusterMetadata.newBuilder().setNumStorageContainers(NUM_STORAGE_CONTAINERS).build(),
              store.getClusterMetadata());
          assertEquals(
              ClusterAssignmentData.newBuilder().build(),
              store.getClusterAssignmentData());
      }
  
      @Test
      public void testInitialize() {
          int numStorageContainers = 2048;
          store.initializeCluster(numStorageContainers);
          assertEquals(
              ClusterMetadata.newBuilder().setNumStorageContainers(numStorageContainers).build(),
              store.getClusterMetadata());
          assertEquals(
              ClusterAssignmentData.newBuilder().build(),
              store.getClusterAssignmentData());
      }
  
      @Test
      public void testUpdateClusterMetadata() {
         int numStorageContainers = 4096;
         ClusterMetadata metadata = ClusterMetadata.newBuilder()
             .setNumStorageContainers(numStorageContainers)
             .build();
         store.updateClusterMetadata(metadata);
         assertEquals(metadata, store.getClusterMetadata());
      }
  
      @Test
      public void testUpdateClusterAssignmentData() {
          ClusterAssignmentData assignmentData = ClusterAssignmentData.newBuilder()
              .putServers(
                  "server-0",
                  ServerAssignmentData.newBuilder()
                      .addContainers(1L)
                      .addContainers(2L)
                      .build())
              .build();
          store.updateClusterAssignmentData(assignmentData);
          assertEquals(assignmentData, store.getClusterAssignmentData());
      }
  
      @Test
      public void testWatchClusterAssignmentData() {
          ClusterAssignmentData assignmentData = ClusterAssignmentData.newBuilder()
              .putServers(
                  "server-0",
                  ServerAssignmentData.newBuilder()
                      .addContainers(1L)
                      .addContainers(2L)
                      .build())
              .build();
  
          @Cleanup("shutdown")
          ExecutorService executor = Executors.newSingleThreadExecutor();
          CompletableFuture<Void> watchFuture = new CompletableFuture<>();
  
          store.watchClusterAssignmentData(data -> {
              FutureUtils.complete(watchFuture, null);
          }, executor);
  
          store.updateClusterAssignmentData(assignmentData);
  
          watchFuture.join();
          assertEquals(assignmentData, store.getClusterAssignmentData());
      }
  
      @Test
      public void testUnwatchClusterAssignmentData() throws Exception {
          ClusterAssignmentData assignmentData = ClusterAssignmentData.newBuilder()
              .putServers(
                  "server-0",
                  ServerAssignmentData.newBuilder()
                      .addContainers(1L)
                      .addContainers(2L)
                      .build())
              .build();
  
          @Cleanup("shutdown")
          ExecutorService executor = Executors.newSingleThreadExecutor();
  
          CompletableFuture<Void> watchFuture = new CompletableFuture<>();
          CountDownLatch latch = new CountDownLatch(2);
  
          Consumer<Void> dataConsumer = ignored -> {
              latch.countDown();
              FutureUtils.complete(watchFuture, null);
          };
  
          assertEquals(0, store.getNumWatchers());
          store.watchClusterAssignmentData(dataConsumer, executor);
          assertEquals(1, store.getNumWatchers());
          store.updateClusterAssignmentData(assignmentData);
  
          watchFuture.join();
          assertEquals(1, latch.getCount());
          assertEquals(assignmentData, store.getClusterAssignmentData());
  
          store.unwatchClusterAssignmentData(dataConsumer);
          assertEquals(0, store.getNumWatchers());
          store.updateClusterAssignmentData(assignmentData);
  
          watchFuture.get(100, TimeUnit.MILLISECONDS);
          assertEquals(1, latch.getCount());
      }
  }
  