Merge pull request #736 from kunlong-luo/fix-null-point-and-cast-exception

648540858

2023-02-02 6246ce6ba84fd2b4e7ce7768bfa1fb56c159cad3

 src/main/java/com/genersoft/iot/vmp/gb28181/task/ISubscribeTask.java

@@ -2,8 +2,9 @@

import javax.sip.DialogState;

/**
 * @author lin
 */
public interface ISubscribeTask extends Runnable{
    void stop();

    DialogState getDialogState();
}