content: /*
   * Copyright (c) 2024, Alibaba Cloud;
   * Licensed 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.aliyun.dataworks.migrationx.transformer.core.spark.command;
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.util.Optional;
  import java.util.concurrent.atomic.AtomicLong;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  class InProcessAppHandle extends AbstractAppHandle {
  
      private static final String THREAD_NAME_FMT = "spark-app-%d: '%s'";
      private static final Logger LOG = Logger.getLogger(InProcessAppHandle.class.getName());
      private static final AtomicLong THREAD_IDS = new AtomicLong();
  
      // Avoid really long thread names.
      private static final int MAX_APP_NAME_LEN = 16;
  
      private volatile Throwable error;
  
      private Thread app;
  
      InProcessAppHandle(LauncherServer server) {
          super(server);
      }
  
      @Override
      public synchronized void kill() {
          if (!isDisposed()) {
              LOG.warning("kill() may leave the underlying app running in in-process mode.");
              setState(State.KILLED);
              disconnect();
  
              // Interrupt the thread. This is not guaranteed to kill the app, though.
              if (app != null) {
                  app.interrupt();
              }
          }
      }
  
      @Override
      public Optional<Throwable> getError() {
          return Optional.ofNullable(error);
      }
  
      synchronized void start(String appName, Method main, String[] args) {
          CommandBuilderUtils.checkState(app == null, "Handle already started.");
  
          if (appName.length() > MAX_APP_NAME_LEN) {
              appName = "..." + appName.substring(appName.length() - MAX_APP_NAME_LEN);
          }
  
          app = new Thread(() -> {
              try {
                  main.invoke(null, (Object)args);
              } catch (Throwable t) {
                  if (t instanceof InvocationTargetException) {
                      t = t.getCause();
                  }
                  LOG.log(Level.WARNING, "Application failed with exception.", t);
                  error = t;
                  setState(State.FAILED);
              }
  
              dispose();
          });
  
          app.setName(String.format(THREAD_NAME_FMT, THREAD_IDS.incrementAndGet(), appName));
          app.start();
      }
  
  }
  