Channel Groups API for POSIX C++ SDK

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 to a channel group

Requires Stream Controller add-on

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

This function adds channels to a channel group.

Method(s)

Adding Channels is accomplished by using the following method(s) in the Posix C++ SDK:

Addng multiple channels to channel groups

1add_channel_to_group(std::vector<std::string> const &channel, std::vector<std::string> const &channel_group)

* required

Parameter	Description
channel * Type: std::vector <std::string>const &	The channel(s) vector to add to the channel group.
channel_group * Type: std::vector<std::string>const &	The channel_group to add to the channel(s).

A future result (pubnub::futres). If transaction is successful, the response will be available via get_channel() function as one channel, a JSON object.

Add a single channel to a channel group

1add_channel_to_group (std::string const &channel, std::string const &channel_group)

* required

Parameter	Description
channel * Type: std::string const &	The channel(s) to add to the channel group.
channel_group * Type: std::string const &	The channel_group to add the channel(s) to.

A future result (pubnub::futres). If transaction is successful, the response will be available via get_channel() function as one channel, a JSON object.

Sample code

Add channels

1const std::string channel_group("family");

1//Sync
2static void add_channel(pubnub::context &pn) {
3  enum pubnub_res res;
4

5  try {
6    res = pn.add_channel_to_group("wife", channel_group).await();
7

8    if (PNR_OK == res) {
9      std::cout <<  pn.get_channel() << std::endl;
10    } else {
11      std::cout << "Failed with code " << res << std::endl;
12    }
13  } catch (std::exception &ex) {
14    std::cout << "Exception: " << ex.what() << std::endl;
15  }
16}
17

18//Lambdas
19static void add_channel(pubnub::context &ipn) {
20  ipn.add_channel_to_group("wife", channel_group)
21    .then([=](pubnub::context &pn, pubnub_res res) {
22      if (PNR_OK == res) {
23        std::cout <<  pn.get_channel() << std::endl;
24      } else {
25        std::cout << "Failed with code " << res << std::endl;
26      }
27  });
28}
29

30//Functions
31static void on_added(pubnub::context &pn, pubnub_res res) {
32  if (PNR_OK == res) {
33    std::cout <<  pn.get_channel() << std::endl;
34  } else {
35    std::cout << "Failed with code " << res << std::endl;
36  }
37}
38

39static void add_channel(pubnub::context &ipn) {
40  ipn.add_channel_to_group("wife", channel_group).then(on_added);
41}

show all 41 lines

Rest response from server

1{
2    "service" : "channel-registry",
3    "status"  : 200,
4    "error"   : false,
5    "message" : "OK"
6}

List channels in a 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 lists all channels in a channel group.

Method(s)

Listing Channels is accomplished by using the following method(s) in the Posix C++ SDK:

1list_channel_group (std::string const &channel_group)

* required

Parameter	Description
channel_group * Type: std::string const &	channel_group to fetch the channels of.

Sample code

List channels

1const std::string channel_group("family");

1//Sync
2static void list_channels(pubnub::context &pn) {
3  enum pubnub_res res;
4

5  try {
6    res = pn.list_channel_group(channel_group).await();
7

8    if (PNR_OK == res) {
9      std::cout <<  pn.get_channel() << std::endl;
10    } else {
11      std::cout << "Failed with code " << res << std::endl;
12    }
13  } catch (std::exception &ex) {
14    std::cout << "Exception: " << ex.what() << std::endl;
15  }
16}
17

18//Lambdas
19static void list_channels(pubnub::context &ipn) {
20  ipn.list_channel_group(channel_group)
21    .then([=](pubnub::context &pn, pubnub_res res) {
22      if (PNR_OK == res) {
23        std::cout <<  pn.get_channel() << std::endl;
24      } else {
25        std::cout << "Failed with code " << res << std::endl;
26      }
27  });
28}
29

30//Functions
31static void on_list_received(pubnub::context &pn, pubnub_res res) {
32  if (PNR_OK == res) {
33    std::cout <<  pn.get_channel() << std::endl;
34  } else {
35    std::cout << "Failed with code " << res << std::endl;
36  }
37}
38

39static void list_channels(pubnub::context &ipn) {
40  ipn.list_channel_group(channel_group).then(on_list_received);
41}

show all 41 lines

Rest response from server

1{
2    "status" : 200,
3    "payload" : {
4        "channels" : ["hi"],
5        "group" : "abcd"
6    },
7    "service" : "channel-registry",
8    "error" : False
9}

Remove channels from a 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 channels from a channel group.

Method(s)

Removing Channels is accomplished by using the following method(s) in the Posix C++ SDK:

1remove_channel_from_group (std::string const &channel, std::string const &channel_group)

* required

Parameter	Description
channel_group * Type: std::string const &	Specifies channel_group to remove the channels from.
channel * Type: std::string const &	The channel to remove from the channel group.

Sample code

Removing channels :

1const std::string channel_group("family");

1//Sync
2static void remove_channel(pubnub::context &pn) {
3  enum pubnub_res res;
4

5  try {
6    res = pn.remove_channel_from_group("son", channel_group).await();
7

8    if (PNR_OK == res) {
9      std::cout <<  pn.get_channel() << std::endl;
10    } else {
11      std::cout << "Failed with code " << res << std::endl;
12    }
13  } catch (std::exception &ex) {
14    std::cout << "Exception: " << ex.what() << std::endl;
15  }
16}
17

18//Lambdas
19

20static void remove_channel(pubnub::context &ipn) {
21  ipn.remove_channel_from_group("son", channel_group)
22    .then([=](pubnub::context &pn, pubnub_res res) {
23      if (PNR_OK == res) {
24        std::cout <<  pn.get_channel() << std::endl;
25      } else {
26        std::cout << "Failed with code " << res << std::endl;
27      }
28  });
29}
30

31//Functions
32static void on_removed(pubnub::context &pn, pubnub_res res) {
33  if (PNR_OK == res) {
34    std::cout <<  pn.get_channel() << std::endl;
35  } else {
36    std::cout << "Failed with code " << res << std::endl;
37  }
38}
39

40static void remove_channel(pubnub::context &ipn) {
41  ipn.remove_channel_from_group("son", channel_group).then(on_removed);
42}

show all 42 lines

Rest response from server

1{
2    "status" : 200,
3    "message" : "OK",
4    "service" : "channel-registry",
5    "error" : False
6}

Delete a 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 deletes a channel group.

Method(s)

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

1remove_channel_group (std::string const &channel_group)

* required

Parameter	Description
channel_group * Type: std::string const &	Specifies channel_group to remove.

Sample code

Deleting Channel Group :

1const std::string channel_group("family");

1//Sync
2static void remove_group(pubnub::context &pn) {
3  enum pubnub_res res;
4

5  try {
6    res = pn.remove_channel_group(channel_group).await();
7

8    if (PNR_OK == res) {
9      std::cout <<  pn.get_channel() << std::endl;
10    } else {
11      std::cout << "Failed with code " << res << std::endl;
12    }
13  } catch (std::exception &ex) {
14    std::cout << "Exception: " << ex.what() << std::endl;
15  }
16}
17

18//Lambdas
19static void remove_group(pubnub::context &ipn) {
20  ipn.remove_channel_group(channel_group)
21    .then([=](pubnub::context &pn, pubnub_res res) {
22      if (PNR_OK == res) {
23        std::cout <<  pn.get_channel() << std::endl;
24      } else {
25        std::cout << "Failed with code " << res << std::endl;
26      }
27  });
28}
29

30//Functions
31static void on_group_removed(pubnub::context &pn, pubnub_res res) {
32  if (PNR_OK == res) {
33    std::cout <<  pn.get_channel() << std::endl;
34  } else {
35    std::cout << "Failed with code " << res << std::endl;
36  }
37}
38

39static void remove_group(pubnub::context &ipn) {
40  ipn.remove_channel_group(channel_group).then(on_group_removed);
41}

show all 41 lines

Rest response from server

1{
2    "status" : 200,
3    "message" : "OK",
4    "service" : "channel-registry",
5    "error" : False
6}