content: /*
   * This file is a part of BSL Language Server.
   *
   * Copyright (c) 2018-2025
   * Alexey Sosnoviy <labotamy@gmail.com>, Nikita Fedkin <nixel2007@gmail.com> and contributors
   *
   * SPDX-License-Identifier: LGPL-3.0-or-later
   *
   * BSL Language Server is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 3.0 of the License, or (at your option) any later version.
   *
   * BSL Language Server is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with BSL Language Server.
   */
  package com.github._1c_syntax.bsl.languageserver;
  
  import com.github._1c_syntax.bsl.languageserver.events.LanguageServerInitializeRequestReceivedEvent;
  import lombok.RequiredArgsConstructor;
  import lombok.extern.slf4j.Slf4j;
  import org.eclipse.lsp4j.services.LanguageServer;
  import org.springframework.context.event.EventListener;
  import org.springframework.scheduling.annotation.Scheduled;
  import org.springframework.stereotype.Component;
  
  /**
   * Наблюдатель за жизнью родительского процесса, запустившего Language Server.
   */
  @Component
  @Slf4j
  @RequiredArgsConstructor
  public class ParentProcessWatcher {
  
    private final LanguageServer languageServer;
    private long parentProcessId;
  
    /**
     * Обработчик события {@link LanguageServerInitializeRequestReceivedEvent}.
     * <p>
     * Анализирует параметры запроса и подготавливает данные для слежения за родительским процессом.
     *
     * @param event Событие
     */
    @EventListener
    public void handleEvent(LanguageServerInitializeRequestReceivedEvent event) {
      var processId = event.getParams().getProcessId();
      if (processId == null) {
        return;
      }
      parentProcessId = processId;
    }
  
    /**
     * Фоновая процедура, отслеживающая родительский процесс.
     */
    @Scheduled(fixedDelay = 30000L)
    public void watch() {
      if (parentProcessId == 0) {
        return;
      }
  
      boolean processIsAlive = ProcessHandle.of(parentProcessId)
        .map(ProcessHandle::isAlive)
        .orElse(false);
  
      if (!processIsAlive) {
        //noinspection StringConcatenationArgumentToLogCall - форматирование через {} не работает из-за NoClassDefException
        LOGGER.info("Parent process with pid " + parentProcessId + " is not found. Closing application...");
        languageServer.exit();
      }
    }
  }
  