Channel State Machine

Implementation of StateMachineGen

ADF channel sender uses the StateMachineGen to implement a state machine. See ChannelSenderEx.Core.Channel module for the implementation.

State machine description

Steps

1. When the client (web or mobile) calls the registration endpoint POST /ext/channel a new channel process is started with its initial state waiting.

2. When the client (web or mobile) opens a connection [socket/sse/longpoll] connection with the server, internally the process state change to connected.

3. If the connection between client and server is interrupted, the process returns to waiting state.

   The waiting state has a timer control, which expects a socket connection (or re-connection) within the time window defined by the channel_shutdown_socket_disconnect parameter in the configuration yaml (unit time is seconds) in order to return to the connected state.

   If client the disconnection was clean (the client requested to close), then the process uses the time defined in te configuration channel_shutdown_socket_disconnect.on_clean_close (default 30 seconds). If this parameter is zero (0) the process is terminated inmediatlly.

   If client disconection wasn't clean (the client and server lost connection), then the process uses the time defined in te configuration channel_shutdown_socket_disconnect.on_disconnection (default 300 seconds). If this parameter is zero (0) the process is terminated inmediatlly.