Channel Groups API for PubNub Java SDK

Breaking changes in v9.0.0

PubNub Java SDK version 9.0.0 unifies the codebases for Java and Kotlin SDKs, introduces a new way of instantiating the PubNub client, and changes asynchronous API callbacks and emitted status events. These changes can impact applications built with previous versions (< 9.0.0) of the Java SDK.

For more details about what has changed, refer to Java/Kotlin SDK migration guide.

Channel groups allow PubNub developers to bundle thousands of channels into a group that can be identified by a name. These channel groups can then be subscribed to, receiving data from the many back-end channels the channel group contains.

Channel group operations

You can't publish to a channel group. You can only subscribe to it. To publish within the channel group, you need to publish to each channel individually.

Add Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function adds a channel to a channel group.

Method(s)

Adding Channels is accomplished by using the following method(s) in the Java SDK:

Maximum number of channels

200 channels can be added to the channel group per API call.

this.pubnub.addChannelsToChannelGroup()
    .channelGroup(String)
    .channels(Array)

Parameter	Type	Required	Description
channelGroup	String	Yes	The channelGroup to add the channels to.
channels	Array	Yes	The channel to add to the channel group.
async	Consumer<Result>	Yes	Consumer of a Result of type PNChannelGroupsAddChannelResult

Basic Usage

Add Channels

pubnub.addChannelsToChannelGroup()
    .channelGroup("cg1")
    .channels(Arrays.asList("ch1", "ch2", "ch3"))
    .async(result -> { /* check result */ });

Response

The addChannelsToChannelGroup() does not return actionable data, be sure to check the status object on the outcome of the operation by checking the status.isError().

{
    "service" : "channel-registry",
    "status"  : 200,
    "error"   : false,
    "message" : "OK"
}

List Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function lists all the channels of the channel group.

Method(s)

Listing Channels is accomplished by using the following method(s) in the Java SDK:

pubnub.listChannelsForChannelGroup()
    .channelGroup(String)
    .async(result -> { /* check result */ });

Parameter	Type	Required	Description
channelGroup	String	Yes	Channel group to fetch the channels.
async	Consumer<Result>	Yes	Consumer of a Result of type PNChannelGroupsAllChannelsResult.

Basic Usage

List Channels

pubnub.listChannelsForChannelGroup()
    .channelGroup("cg1")
    .async(result -> { /* check result */ });

Returns

The listChannelsForChannelGroup() operation returns a PNChannelGroupsAllChannelsResult which contains the following operations:

Method	Type	Description
getChannels()	List<String>	List of channels of a channel group.

Remove Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function removes the channels from the channel group.

Method(s)

Removing Channels is accomplished by using the following method(s) in the Java SDK:

pubnub.removeChannelsFromChannelGroup()
    .channelGroup(String)
    .channels(Array)

Parameter	Type	Required	Description
channels	Array	Yes	The channels to remove from the channel group.
channelGroup	String	Yes	Specifies channelGroup to remove the channels from.
async	Consumer<Result>	Optional	Consumer of a Result of type PNChannelGroupsRemoveChannelResult.

Basic Usage

Remove channels

pubnub.removeChannelsFromChannelGroup()
    .channelGroup("family")
    .channels(Arrays.asList("son"))
    .async(result -> { /* check result */ });

Response

The removeChannelsFromChannelGroup() does not return actionable data, be sure to check the status object on the outcome of the operation by checking the status.isError().

{
    "status" : 200,
    "message" : "OK",
    "service" : "channel-registry",
    "error" : False
}

Delete Channel Group

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function removes the channel group.

Method(s)

Deleting Channel Group is accomplished by using the following method(s) in the Java SDK:

pubnub.deleteChannelGroup()
    .channelGroup(String)

Parameter	Type	Required	Description
channelGroup	String	Yes	Specifies channelGroup to remove.
async	Consumer<Result>	Optional	Consumer of a Result of type PNChannelGroupsDeleteGroupResult.

Basic Usage

Delete Channel Group

pubnub.deleteChannelGroup()
    .channelGroup("family")
    .async(result -> { /* check result */ });

Response

The deleteChannelGroup() does not return actionable data, be sure to check the status object on the outcome of the operation by checking the status.isError().

{
    "status" : 200,
    "message" : "OK",
    "service" : "channel-registry",
    "error" : False
}