Dart 隔离访问共享对象实例

Question

我目前正在使用隔离将查询并行发送到数据库服务器。我有一个连接器对象来建立到数据库的连接，我想在所有隔离中共享它，所以我不必为每个隔离创建单独的连接。

到目前为止，我似乎只能在隔离之间共享特殊的可序列化对象。我正在使用发送和接收端口进行消息传递。对于其他对象（例如我的连接器对象），dart-vm 产生错误：

Illegal argument(s): Illegal argument in isolate message : (object extends NativeWrapper)

您知道在多个隔离之间共享通用对象实例的任何方法吗？还是我必须为每个隔离创建一个单独的实例？

谢谢！

佩德罗

Answer 1

来自 SendPort.send 方法代码文档

   * In the special circumstances when two isolates share the same code and are
   * running in the same process (e.g. isolates created via [Isolate.spawn]), it
   * is also possible to send object instances (which would be copied in the
   * process). This is currently only supported by the dartvm.  For now, the
   * dart2js compiler only supports the restricted messages described above.

我认为也不支持作为本机对象的包装器的对象。
目前看来唯一的方法是在每个隔离中创建一个新连接。

这些价值观始终在努力

   * The content of [message] can be: primitive values (null, num, bool, double,
   * String), instances of [SendPort], and lists and maps whose elements are any
   * of these. List and maps are also allowed to be cyclic.