Scala SDK for Realtime Apps

Add PubNub to your project using one of the procedures defined under How to Get It.

 import com.pubnub.api.{Pubnub, Callback, PubnubError}

Example

val pubnub = new Pubnub("demo","demo")

pubnub.subscribe("my_channel", new Callback {
  override def connectCallback(channel: String, message: Object) {
    pubnub.publish("my_channel", "Hello from the PubNub Scala SDK", new Callback() {})
  }
})

Copy and paste examples

In addition to the Hello World sample code, we also provide some copy and paste snippets of common API functions:

Instantiate a new Pubnub instance. Only the subscribe_key is mandatory. Also include publish_key if you intend to publish from this instance, and the secret_key if you wish to perform PAM administrative operations from this Scala instance.

For security reasons you should only include the secret-key on a highly secured server. The secret-key is only required for granting rights using our Access Manager.

When you init with secret_key, you get root permissions for the Access Manager. With this feature you don't have to grant access to your servers to access channel data. The servers get all access on all channels.

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

val pubnub = new Pubnub("demo","demo")

If you no longer need to use the Pubnub instance, do not forget to explicitly stop it's running threads using shutdown() method.

Time

Call time() to verify the client connectivity to the origin:

val callback = new Callback() {
  override def successCallback(channel: String, response: Object): Unit =
    println(response)

  override def errorCallback(channel: String, pubnubError: PubnubError): Unit =
    println(pubnubError.getErrorString)
}

pubnub.time(callback)

Subscribe (listen on) a channel (it's async!):

pubnub.subscribe("my_channel", new Callback {
  override def connectCallback(channel: String, message: Object): Unit =
    println("SUBSCRIBE : CONNECT on channel: " + channel + " : " + message.getClass +
      " : " + message.toString)

  override def disconnectCallback(channel: String, message: Object): Unit =
    println("SUBSCRIBE : DISCONNECT on channel: " + channel + " : " + message.getClass +
      " : " + message.toString)

  override def successCallback(channel: String, message: Object): Unit =
    println("SUBSCRIBE :" + channel + " : " + message.getClass + " : " + message)

  override def errorCallback(channel: String, pubnubError: PubnubError): Unit =
    println("SUBSCRIBE : ERROR on channel:" + channel + " : " + pubnubError)

  override def reconnectCallback(channel: String, message: Object): Unit =
    println("SUBSCRIBE : RECONNECT on channel:" + channel + " : " + message.getClass +
      " : " + message.toString)
})

Publish

Publish a message to a channel:

val callback = new Callback() {
  override def successCallback(channel: String, response: Object): Unit =
    println(response.toString)

  override def errorCallback(channel: String, pubnubError: PubnubError): Unit =
    println(pubnubError.getErrorString)
}

pubnub.publish("my_channel", "Hello from the PubNub Java SDK!", callback)

Here Now

Get occupancy of who's here now on the channel by UUID:

Requires that the Presence add-on is enabled for your key. How do I enable add-on features for my keys? - see http://www.pubnub.com/knowledge-base/discussion/644/how-do-i-enable-add-on-features-for-my-keys

val callback = new Callback {
  override def successCallback(channel: String, message: Object): Unit =
    println(message)

  override def errorCallback(channel: String, pubnubError: PubnubError): Unit =
    println(pubnubError.getErrorString)
}

pubnub.hereNow("my_channel", callback)

Presence

Subscribe to realtime Presence events, such as join, leave, and timeout, by UUID. Setting the presence attribute to a callback will subscribe to presents events on my_channel:

pubnub.presence("my_channel", new Callback {
  override def connectCallback(channel: String, message: Object): Unit =
    println("CONNECT on channel: " + channel + " : " + message.getClass +
      " : " + message.toString)

  override def disconnectCallback(channel: String, message: Object): Unit =
    println("DISCONNECT on channel: " + channel + " : " + message.getClass +
      " : " + message.toString)

  override def successCallback(channel: String, message: Object): Unit =
    println(channel + " : " + message.getClass + " : " + message)

  override def errorCallback(channel: String, pubnubError: PubnubError): Unit =
    println(ERROR on channel:" + channel + " : " + pubnubError)

  override def reconnectCallback(channel: String, message: Object): Unit =
    println(RECONNECT on channel:" + channel + " : " + message.getClass +
      " : " + message.toString)
})

History

Retrieve published messages from archival storage:

Requires that the Storage and Playback add-on is enabled for your key. How do I enable add-on features for my keys? - see http://www.pubnub.com/knowledge-base/discussion/644/how-do-i-enable-add-on-features-for-my-keys

pubnub.history("history_channel", 100, true, new Callback {
  override def successCallback(channel: String, message: Object): Unit =
    println(message.toString)

  override def errorCallback(channel: String, pubnubError: PubnubError): Unit =
    println(pubnubError.getErrorString)
})

Unsubscribe

Stop subscribing (listening) to a channel.

pubnub.unsubscribe("my_channel")

referance content

SelectScala SDK 3.7.11

Get Code:

Get Code: Source

Hello World