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.kafka.server.common;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Optional;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicLong;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  class ProducerIdsBlockTest {
  
      @Test
      public void testEmptyBlock() {
          assertEquals(-1, ProducerIdsBlock.EMPTY.lastProducerId());
          assertEquals(0, ProducerIdsBlock.EMPTY.nextBlockFirstId());
          assertEquals(0, ProducerIdsBlock.EMPTY.size());
      }
  
      @Test
      public void testDynamicBlock() {
          long firstId = 1309418324L;
          int blockSize = 5391;
          int brokerId = 5;
  
          ProducerIdsBlock block = new ProducerIdsBlock(brokerId, firstId, blockSize);
          assertEquals(firstId, block.firstProducerId());
          assertEquals(firstId + blockSize - 1, block.lastProducerId());
          assertEquals(firstId + blockSize, block.nextBlockFirstId());
          assertEquals(blockSize, block.size());
          assertEquals(brokerId, block.assignedBrokerId());
      }
  
      @Test
      public void testClaimNextId() throws Exception {
          for (int i = 0; i < 50; i++) {
              ProducerIdsBlock block = new ProducerIdsBlock(0, 1, 1);
              CountDownLatch latch = new CountDownLatch(1);
              AtomicLong counter = new AtomicLong(0);
              CompletableFuture.runAsync(() -> {
                  Optional<Long> pid = block.claimNextId();
                  counter.addAndGet(pid.orElse(0L));
                  latch.countDown();
              });
              Optional<Long> pid = block.claimNextId();
              counter.addAndGet(pid.orElse(0L));
              assertTrue(latch.await(1, TimeUnit.SECONDS));
              assertEquals(1, counter.get());
          }
      }
  
  }