WATCH

WATCH watches a query and notifies you in real-time.

>>> WATCH KEYS 'users:1:*' EVENT put_key RETURN KEY VALUE
0) users:1:product_view:a
1) "{\"platform\":\"android\"}"  <--- value

The above statement subscribes to the connected client to watch for new keys matching the above pattern. The subscribers receive the data requested i.e. KEY, VALUE as a list.

>>> WATCH KEYS 'users:1:*' EVENT put_key WINDOW 1s GROUP_BY (KEY) RETURN (KEY VALUE)
0) users:1:product_view:a
0) users:1:product_view:a
1) "{\"platform\":\"android\"}"  <--- value
2) users:1:product_view:a
3) "{\"platform\":\"ios\"}"  <--- value
1) users:1:product_view:b
.
.
.

The JSON equivalent of response is

[
  "users:1:product_view:a": [
    ["users:1:product_view:a", "{\"platform\":\"android\"}"],
    ["users:1:product_view:a", "{\"platform\":\"ios
  ],
  "users:1:product_view:b": [
    ...
  ],
]

The above statement subscribes to the connected client to watch for new keys matching the pattern. The subscribers receive the data windowed by 1 second (not sliding window), group by key, and return KEY, VALUE as a list.