Set Presence State
Clients can set dynamic custom state for their users on one or more channels. This custom state persists on a channel as long as the user stays subscribed to that channel. Some examples of custom state are to add your score, game state, or location in an application if it changes frequently.
State is transient data (it's not persisted anywhere). When the client disconnects, the state data is lost. If you require a client's state to be restored on reconnect, be sure to cache that data locally to the client. If you wish to persist data forever, please refer to the Objects feature.
PubNub also triggers presence state-change events anytime the user's state is modified. Clients can receive these events by subscribing to presence channels. Refer to Presence Events for more details.
Setting Presence State
You can set state data for a UUID on a given channel(s) or channel group(s). The UUID is the current client's UUID when this API is invoked. When setting state on a channel group, it propagates that state to all channels contained in that channel group.
pubnub.setState(
{
state: {"mood":"pumped", "isTyping":false},
channels: ["chats.room1"],
channelGroups: ["cg_user123_friends"]
},
function (status, response) {
if (status.isError) {
console.log(status);
}
else {
console.log(response);
}
}
);
pubnub.setPresence(
state: ["mood": "pumped", "workingFrom": "Home"],
on: ["chats.room1"],
and: ["cg_user123_friends"]
) { result in
switch result {
case let .success(response):
print("Successful Set State Response: \(response)")
case let .failure(error):
print("Failed Set State Response: \(error.localizedDescription)")
}
}
[self.pubnub setState: @{@"mood": @"pumped", @"workingFrom": @"Home"}
forUUID:self.pubnub.uuid onChannel: @"chats.room1"
withCompletion:^(PNClientStateUpdateStatus *status) {
// handle status
}];
JsonObject state = new JsonObject();
state.addProperty("mood", "pumped");
state.addProperty("workingFrom", "Home");
pubnub.setPresenceState()
.channels(Arrays.asList("chats.room1"))
.channelGroups(Arrays.asList("cg_user123_friends"))
.state(state).async(new PNCallback<PNSetStateResult>() {
@Override
public void onResponse(final PNSetStateResult result, PNStatus status) {
if (status.isError()) {
System.out.println(status);
}
else {
System.out.println(result);
}
}
});
Dictionary<string, object> state = new Dictionary<string, object>();
state.Add("mood", "pumped");
state.Add("workingFrom", "Home");
pubnub.SetPresenceState()
.Channels(new string[] {"chats.room1"})
.ChannelGroups(new string[] {"cg_user123_friends"})
.State(myState)
.Execute(new PNSetStateResultExt((result, status) => {
if (status.IsError()) {
Console.WriteLine("SetPresenceState error:" + status);
}
else {
Console.WriteLine("SetPresenceState success:" + result);
}
}
));
my_state = {"mood": "pumped", "workingFrom": "Home"}
envelope = pubnub.set_state()\
.channels(["chats.room1"]) \
.channel_groups(["cg_user123_friends"])\
.state(my_state)\
.sync()
When you set state for a client, the existing state is overwritten. Therefore, if you need to update part of the state, you must pass the complete state data payload. For this reason, it's best to keep your state data payloads from getting too large.
Getting Presence State
You can get state data for any client on a given channel(s) or channel group(s) user the Get State API. This is useful to get the state of other clients based on their UUID.
pubnub.getState(
{
uuid: "anotherClientUUID",
channels: ["chats.room1"],
channelGroups: ["cg_user123_friends"]
},
function (status, response) {
// handle status, response
}
);
pubnub.getPresenceState(
for: "anotherClientUUID",
on: ["chats.room1"],
and: ["cg_user123_friends"]
) { result in
switch result {
case let .success(response):
print("Successful Get State Response: \(response)")
case let .failure(error):
print("Failed Get State Response: \(error.localizedDescription)")
}
}
[self.pubnub stateForUUID:@"anotherClientUUID" onChannel:@"chats.room1"
withCompletion:^(PNChannelClientStateResult *result, PNErrorStatus *status) {
if (!status) {
}
else {
}
}];
pubnub.getPresenceState()
.channels(Arrays.asList("chats.room1"))
.channelGroups(Arrays.asList("cg_user123_friends"))
.uuid("anotherClientUUID")
.async(new PNCallback<PNGetStateResult>() {
@Override
public void onResponse(PNGetStateResult result, PNStatus status) {
if (status.isError()) {
System.out.println(status);
}
else {
System.out.println(result);
}
}
});
pubnub.GetPresenceState()
.Channels(new string[] {"chats.room1"})
.Uuid(clientUUID)
.Execute(new PNGetStateResultExt((result, status) => {
if (status.IsError()) {
Console.WriteLine("GetPresenceState error:" + status);
}
else {
Console.WriteLine("GetPresenceState success:" + result);
}
}
));
envelope = pubnub.get_state()\
.uuid("anotherClientUUID")\
.channels(["chats.room1"])\
.sync()