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 com.datastax.oss.driver.api.testinfra.ccm;
  
  import java.util.concurrent.Semaphore;
  
  /**
   * Running multiple parallel integration tests may fail due to query timeout when trying to apply
   * several schema changes at once. Limit concurrently executed DDLs to 5.
   */
  public class SchemaChangeSynchronizer {
    private static final Semaphore lock = new Semaphore(5);
  
    public static void withLock(Runnable callback) {
      try {
        lock.acquire();
        try {
          callback.run();
        } finally {
          lock.release();
        }
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        throw new RuntimeException("Thread interrupted wile waiting to obtain DDL lock", e);
      }
    }
  }
  