Channel Groups API for PubNub Java SDK

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

Learn more about our Channel Groups here.

Channel Group operations

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

Adding 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.

Description

This function adds a channel to a channel group.

Method(s)

Adding Channels is accomplished by using the following method(s) in the Java V4 SDK:

Maximum number of channels

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

this.pubnub.addChannelsToChannelGroup().channelGroup(String).channels(Array)
ParameterTypeRequiredDescription
channelGroupStringYesThe channelGroup to add the channels to.
channelsArrayYesThe channel to add to the channel group.
asyncPNCallbackYesPNCallback of type PNChannelGroupsAddChannelResult

Basic Usage

Adding Channels

pubnub.addChannelsToChannelGroup()    .channelGroup("cg1")    .channels(Arrays.asList("ch1", "ch2", "ch3"))    .async(new PNCallback<PNChannelGroupsAddChannelResult>() {        @Override        public void onResponse(PNChannelGroupsAddChannelResult result, PNStatus status) {        }    });

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"}

Listing 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.

Description

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 V4 SDK:

pubnub.listChannelsForChannelGroup().channelGroup(String)
ParameterTypeRequiredDescription
channelGroupStringYesChannel group to fetch the channels.
asyncPNCallbackYesPNCallback of type PNChannelGroupsAllChannelsResult.

Basic Usage

Listing Channels

pubnub.listChannelsForChannelGroup()    .channelGroup("cg1")    .async(new PNCallback<PNChannelGroupsAllChannelsResult>() {        @Override        public void onResponse(PNChannelGroupsAllChannelsResult result, PNStatus status) {        }    });

Returns

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

MethodTypeDescription
getChannels()List<String>List of channels of a channel group.

Removing 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.

Description

This function removes the channels from the channel group.

Method(s)

Removing Channels is accomplished by using the following method(s) in the Java V4 SDK:

pubnub.removeChannelsFromChannelGroup().channelGroup(String).channels(Array)
ParameterTypeRequiredDescription
channelsArrayYesThe channels to remove from the channel group.
channelGroupStringYesSpecifies channelGroup to remove the channels from.
asyncPNCallbackOptionalPNCallback of type PNChannelGroupsRemoveChannelResult.

Basic Usage

Removing channels

pubnub.removeChannelsFromChannelGroup()    .channelGroup("family")    .channels(Arrays.asList("son"))    .async(new PNCallback<PNChannelGroupsRemoveChannelResult>() {        @Override        public void onResponse(PNChannelGroupsRemoveChannelResult result, PNStatus status) {        }    });

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}

Deleting 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.

Description

This function removes the channel group.

Method(s)

Deleting Channel Group is accomplished by using the following method(s) in the Java V4 SDK:

pubnub.deleteChannelGroup().channelGroup(String)
ParameterTypeRequiredDescription
channelGroupStringYesSpecifies channelGroup to remove.
asyncPNCallbackOptionalPNCallback of type PNChannelGroupsDeleteGroupResult.

Basic Usage

Deleting Channel Group

pubnub.deleteChannelGroup()    .channelGroup("family")    .async(new PNCallback<PNChannelGroupsDeleteGroupResult>() {        @Override        public void onResponse(PNChannelGroupsDeleteGroupResult result, PNStatus status) {        }    });

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}