Manage channel updates

Update channel details and receive events whenever someone updates them.

Usage in Blueprints and C++

Requires App Context

To store data about channels, you must enable App Context for your app's keyset in the Admin Portal.

Update channel details

You can edit the metadata of an existing channel with Update() and UpdateChannel().

Both of them give the same output. The only difference is that you call a given method either on the Chat (UpdateChannel()) or the Channel (Update()) object. Depending on the object, these methods take a different set of input parameters - you either have to specify the channel ID you want to update or not because it's already known.

Method signature

Blueprint

C++

• Channel->Update()

  Channel->Update(FPubnubChatChannelData ChannelData);

• Chat->UpdateChannel()

  Chat->UpdateChannel(
      FString ChannelID, 
      FPubnubChatChannelData ChannelData
  );

Parameter	Type	Required in Channel->Update()	Required in Chat->UpdateChannel()	Default	Description
ChannelID	FString	No	Yes	n/a	Unique channel identifier.
ChannelData	FPubnubChatChannelData	No	No	n\a	Information about the channel.

FPubnubChatChannelData

Parameter	Type	Required	Default	Description
ChannelName	FString	No	n/a	Display name for the channel (must not be empty or consist only of whitespace characters).
Description	FString	No	n/a	Channel's identifier in an external system. You can use it to match id with a similar identifier from an external database.
CustomDataJson	FString	No	n/a	JSON providing custom data about the channel. Values must be scalar only; arrays or objects are not supported. Filtering App Context data through the custom property is not recommended in SDKs.
Status	FString	No	n/a	Tag that lets you categorize your app channels by their current state. The tag choice is entirely up to you and depends on your use case.
Type	FString	No	n/a	Tag that lets you categorize your app channels by their functional roles. The tag choice is entirely up to you and depends on your use case.

Output

Type	Description
UPubnubChannel*	Object returning the updated channel metadata.

Basic usage

Update the description of the support channel.

• Update()

  #include "Kismet/GameplayStatics.h"
  #include "PubnubChatSubsystem.h"
  
  UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(ContextObject);
  UPubnubChatSubsystem* PubnubChatSubsystem = GameInstance->GetSubsystem<UPubnubChatSubsystem>();
  
  UPubnubChat* Chat = PubnubChatSubsystem->InitChat("demo", "demo", "my_user");
  
  UPubnubChannel* Channel = Chat->GetChannel("support");
  
  // Define the channel data
  FPubnubChatChannelData ChannelData;
  ChannelData.Description = "Channel for CRM tickets";
  
  Channel->Update(ChannelData);

• UpdateChannel()

  #include "Kismet/GameplayStatics.h"
  #include "PubnubChatSubsystem.h"
  
  UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(ContextObject);
  UPubnubChatSubsystem* PubnubChatSubsystem = GameInstance->GetSubsystem<UPubnubChatSubsystem>();
  
  UPubnubChat* Chat = PubnubChatSubsystem->InitChat("demo", "demo", "my_user");
  
  // Define the channel data
  FPubnubChatChannelData ChannelData;
  ChannelData.Description = "Channel for CRM tickets";
  
  Chat->UpdateChannel("support", ChannelData);

Get channel updates

You can receive updates when specific Channel object(s) are edited or removed on other clients using the following methods:

• StreamUpdates() checks updates on a single Channel object.
• StreamUpdatesOn() checks updates on a Channel object list.

Both methods accept a callback function as an argument. The Unreal Chat SDK invokes this callback whenever someone adds, changes, or removes channel metadata.

Underneath, these methods subscribe the current user to a channel and add an objects event listener to receive all objects events of type channel. These methods also return the unsubscribe function you can invoke to stop receiving objects events and unsubscribe from the channel.

Method signature

Blueprint

C++

• StreamUpdates()

  Channel->StreamUpdates(FOnPubnubChannelStreamUpdateReceived ChannelUpdateCallback);

• StreamUpdatesOn()

  Channel->StreamUpdatesOn(
      TArray<UPubnubChannel*> Channels, 
      FOnPubnubChannelStreamUpdateReceived ChannelUpdateCallback
  );

Parameter	Type	Required in StreamUpdates()	Required in StreamUpdatesOn()	Default	Description
Channels	TArray<UPubnubChannel*>	No	Yes	n/a	Array of Channel objects for which you want to get updates.
ChannelUpdateCallback	FOnPubnubChannelStreamUpdateReceived	Yes	Yes	n/a	Callback function passed as a parameter to both methods. It defines the custom behavior to be executed when detecting channel metadata changes.

Handle the response

Output

Type	Description
UPubnubCallbackStop*	Object on which you can call Stop() to stop receiving updates.

Basic usage

• StreamUpdates()

  Get updates on the support channel.

  #include "Kismet/GameplayStatics.h"
  #include "PubnubChatSubsystem.h"
  
  UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(this);
  UPubnubChatSubsystem* PubnubChatSubsystem = GameInstance->GetSubsystem<UPubnubChatSubsystem>();
  
  UPubnubChat* Chat = PubnubChatSubsystem ->InitChat("demo", "demo", "my_user");
  
  // Get the channel and save the reference
  UPubnubChannel* Channel = Chat->GetChannel("support");
  
  // Create a pubnub response delegate
  // you MUST implement your own callback function to handle the response
  FOnPubnubChannelStreamUpdateReceived StreamUpdatesResponse;
  StreamUpdatesResponse.BindDynamic(this, &AMyActor::OnChannelUpdateResponseReceived);

  show all 17 lines

• StreamUpdatesOn()

  Get updates on the support and incident-management channels.

  #include "Kismet/GameplayStatics.h"
  #include "PubnubChatSubsystem.h"
  
  UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(this);
  UPubnubChatSubsystem* PubnubChatSubsystem = GameInstance->GetSubsystem<UPubnubChatSubsystem>();
  
  UPubnubChat* Chat = PubnubChatSubsystem ->InitChat("demo", "demo", "my_user");
  
  // Get the channels and save the reference
  UPubnubChannel* Channel1 = Chat->GetChannel("support");
  UPubnubChannel* Channel2 = Chat->GetChannel("incident-management");
  
  TArray<UPubnubChannel*> Channels;
  Channels.Add(Channel1);
  Channels.Add(Channel2);

  show all 22 lines

Other examples

• StreamUpdates()

  Stop listening to updates on the support channel.

  auto StopUpdates = Channel->Channel->StreamUpdates(StreamUpdatesResponse);
  
  StopUpdates->Stop();

• StreamUpdatesOn()

  Stop listening to updates on the support and incident-management channels.

  auto StopUpdates = Channel->StreamUpdatesOn(Channels, StreamUpdatesOnResponse);
  
  StopUpdates->Stop();