Using a channel metacounter, you can store additional information to channels such as the tracking the number of likes on a message. A channel metacounter in
Map<String, Integer> can be stored into a
Channel object and can be fetched or rendered into the UI.
A channel metacounter is primarily used to track and update discrete indicators in a channel. Use channel metacounters instead of channel metadata when you need an integer with increasing and decreasing atomic operations.
To store channel metacounter into a
Channel object, create
Map<String, Integer> and add key-value items. Then pass the map as an argument to a parameter when calling the
createMetaCounters() method. You can put multiple key-value items in the map.
The procedure of updating a channel metacounter is the same as creating a channel metacounter. Values of existing keys are updated and values of new keys are added.
You can increase values in a channel metacounter by passing a
Map of keys to increase as an argument to a parameter in the
increaseMetaCounters() method. method. The values of corresponding keys in the metacounter are increased by the specified number.
You can decrease values in a channel metacounter by passing a
Map of keys to decrease as an argument to a parameter in the
decreaseMetaCounters() method. The values of corresponding keys in the metacounter are decreased by the specified number.
You can retrieve a channel metacounter by creating a
List of keys to retrieve and passing it as an argument to a parameter in the
getMetaCounters() method. A
Map<String, Integer> collection is returned through a callback handler with the corresponding key-value items.
You can delete a channel metacounter as shown below.