Refactory of envisalink (#6160)

* Refactory of envisalink

* remove event buss

* init dispatcher from hass.

* Move platform to new dispatcher

* fix lint

* add unittest & threadded functions

* fix copy & past error

homeassistant/helpers/dispatcher.py

@@ -0,0 +1,42 @@
+"""Helpers for hass dispatcher & internal component / platform."""
+
+from homeassistant.core import callback
+
+DATA_DISPATCHER = 'dispatcher'
+
+
+def dispatcher_connect(hass, signal, target):
+    """Connect a callable function to a singal."""
+    hass.add_job(async_dispatcher_connect, hass, signal, target)
+
+
+@callback
+def async_dispatcher_connect(hass, signal, target):
+    """Connect a callable function to a singal.
+
+    This method must be run in the event loop.
+    """
+    if DATA_DISPATCHER not in hass.data:
+        hass.data[DATA_DISPATCHER] = {}
+
+    if signal not in hass.data[DATA_DISPATCHER]:
+        hass.data[DATA_DISPATCHER][signal] = []
+
+    hass.data[DATA_DISPATCHER][signal].append(target)
+
+
+def dispatcher_send(hass, signal, *args):
+    """Send signal and data."""
+    hass.add_job(async_dispatcher_send, hass, signal, *args)
+
+
+@callback
+def async_dispatcher_send(hass, signal, *args):
+    """Send signal and data.
+
+    This method must be run in the event loop.
+    """
+    target_list = hass.data.get(DATA_DISPATCHER, {}).get(signal, [])
+
+    for target in target_list:
+        hass.async_add_job(target, *args)