Incorporating AngularJS $watch and $interval functionalities into a communication platform

Currently, I am incorporating messaging into my angular application that interfaces with a rails backend. To create a sense of real-time communication, I have opted to utilize the $interval directive, which triggers calls to the server every 5 seconds to retrieve conversations between two users. Additionally, I have employed $watch to monitor changes in the message object and display any updated conversations.

Here is the code snippet:

$scope.messages = messages.messages

getNewMessage = ->
 conversation.getConverationBetweenTwoUsers($stateParams.userId).then ((messages) ->
  $scope.messages = messages.messages
  ), (error) ->
  $state.reload()


checkForNewMessages = ->
  $interval(getNewMessage, 5000)

$scope.$watch('messages.messages', checkForNewMessages, true)

I would appreciate it if someone could clarify why utilizing websockets is preferable over this method. Furthermore, if my current approach is flawed, could you kindly elaborate on why that is the case and suggest a more effective alternative solution.

It is important to note that I already have existing user conversations, so any proposed solution must accommodate these pre-existing discussions.

Answer №1

Using websockets enables real-time communication without the need to constantly request data from the client side. By establishing a connection between the server and the client, websockets allow the server to immediately push new data to the client upon receiving it.

This approach changes the method of data transmission significantly.

With websockets, when a client generates a new message, it is sent back to the server through an emitted event that the server listens for. The server then relays this message to all relevant clients by emitting an event.

The event carries a payload, which typically includes the message content and user information.

For instance: Client A triggers a 'newMsg' event with the data '{user: user123, msg: my message, room: 512}' The server is set to respond to the 'newMsg' event. Upon detecting a 'newMsg' event, the server sends out the payload as an event to all listening clients, such as: socket.emit('512', '{user: 1234, msg: my message}')

Subsequently, any connected clients monitoring the '512' event will receive the message. It's also possible to incorporate database transactions during message relay to capture conversations effectively.

While I cannot provide specific details about rails, setting up socket listeners is generally straightforward - you create a listener function and assign a particular event to it. When the specified event occurs, you execute the necessary logic without the need for continuous data retrieval.

For example:

socket.on('myEvent', function(data) {
    //perform desired operations on the data
})

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