content: /*
   * Copyright 2021-2024 Aklivity Inc.
   *
   * Aklivity 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 io.aklivity.zilla.runtime.engine.test.internal.k3po.ext.behavior;
  
  import static org.jboss.netty.util.internal.ExecutorUtil.shutdownNow;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  
  import org.jboss.netty.util.ExternalResourceReleasable;
  import org.jboss.netty.util.ThreadRenamingRunnable;
  
  import io.aklivity.zilla.runtime.engine.test.internal.k3po.ext.ZillaExtConfiguration;
  
  public class ZillaEnginePool implements ExternalResourceReleasable
  {
      private final ZillaExtConfiguration config;
  
      private ZillaEngine engine;
      private ExecutorService engineExecutor;
  
      public ZillaEnginePool(
          ZillaExtConfiguration config)
      {
          this.config = config;
      }
  
      public ZillaEngine nextEngine()
      {
          if (engine == null)
          {
              this.engine = new ZillaEngine(config);
              this.engineExecutor = Executors.newFixedThreadPool(1);
              this.engineExecutor.execute(new ThreadRenamingRunnable(engine, "Zilla Engine #1"));
          }
  
          return engine;
      }
  
      public void shutdown()
      {
          if (engine != null)
          {
              engine.shutdown();
          }
      }
  
      @Override
      public void releaseExternalResources()
      {
          shutdown();
  
          if (engine != null)
          {
              engine.releaseExternalResources();
              shutdownNow(engineExecutor);
          }
      }
  }
  