带你读《2022技术人的百宝黑皮书》——谈一谈凑单页的那些优雅设计（5）

 public class ChainBaseHandler<T extends Context> { 2  /**
  * 任务执行
  * @param context
 */
  public void execute(T context) {
  List<String> executeCommands = Lists.newArrayList();
  for (Command<T> c : commands) {
  try {
// 前置校验
  if (!c.check(context)) {
  continue;
 }
  // 执行
  boolean isContinue = timeConsuming(() -> execute(context, c), c, executeCommands);
  if (!isContinue) {
break;
}
} catch (Throwable e) {
// 打印异常信息
GatherContext.debug("exception", c.getClass().getSimpleName()); GatherContext.error(c.getClass().getSimpleName() + " catch exception", e);
}
}
// 打印个命令任务耗时
GatherContext.debug(this.getClass().getSimpleName() + "-execute", executeCommands);
)
)

  private boolean timeConsuming(Supplier<Boolean> supplier, Command<T> c, List<String> execute- Commands) {
  long startTime = System.currentTimeMillis();
  boolean isContinue = supplier.get();
  long endTime = System.currentTimeMillis();
  long timeConsuming = endTime - startTime;
  executeCommands.add(c.getClass().getSimpleName() + ":" + timeConsuming);
  return isContinue;
 }

 /**
  * 执行每个命令
  * @return 是否继续执行4 */
  private <D extends ContextData> boolean execute(Context context, Command<T> c) {
  if (context instanceof MuchContext) {
  return execute((MuchContext<D>) context, c); 8 }
  if (context instanceof OneContext) {
  return execute((OneContext<D>) context, c); 11 }
  return true;
)
/**
* 单数据执行
* @return 是否继续执行
*/
private <D  extends ContextData> boolean execute(OneContext<D> oneContext, Command<T>  c)   {     if (Objects.isNull(oneContext.getData())) {
return false;
}
if (c instanceof CommonCommand) {
return ((CommonCommand<OneContext<D>>) c).execute(oneContext);
}
return true;
}
/**
* 批量数据执行
* @return 是否继续执行
*/
private <D  extends  ContextData>  boolean  execute(MuchContext<D>  muchContext,  Command<T>  c)  { if (CollectionUtils.isEmpty(muchContext.getData())) {
return false;
}
if (c instanceof SingleCommand) {
muchContext.getData().forEach(data -> ((SingleCommand<MuchContext<D>, D>) c).execute (data, muchContext));
return true;
}
if (c instanceof CommonCommand) {
return ((CommonCommand<MuchContext<D>>) c).execute(muchContext);
}
return true;