Class: Tasks

Inherits:
Object show all
Defined in:
lib/volt/page/tasks.rb

Overview

The tasks class provides an interface to call tasks on the backend server.

Instance Method Summary collapse

Constructor Details

#initialize(page) ⇒ Tasks

Returns a new instance of Tasks.



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# File 'lib/volt/page/tasks.rb', line 4

def initialize(page)
  @page = page
  @callback_id = 0
  @callbacks = {}

  page.channel.on('message') do |_, *args|
    received_message(*args)
  end
end

Instance Method Details

#call(class_name, method_name, *args, &callback) ⇒ Object 



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# File 'lib/volt/page/tasks.rb', line 14

def call(class_name, method_name, *args, &callback)
  if callback
    callback_id = @callback_id
    @callback_id += 1

    # Track the callback
    # TODO: Timeout on these callbacks
    @callbacks[callback_id] = callback
  else
    callback_id = nil
  end

  @page.channel.send_message([callback_id, class_name, method_name, *args])
end

#notify_query(method_name, collection, query, *args) ⇒ Object

Called when the backend sends a notification to change the results of a query.



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# File 'lib/volt/page/tasks.rb', line 58

def notify_query(method_name, collection, query, *args)
  query_obj = Persistors::ArrayStore.query_pool.lookup(collection, query)
  query_obj.send(method_name, *args)
end

#received_message(name, callback_id, *args) ⇒ Object 



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# File 'lib/volt/page/tasks.rb', line 30

def received_message(name, callback_id, *args)
  case name
  when 'added', 'removed', 'updated', 'changed'
    notify_query(name, *args)
  when 'response'
    response(callback_id, *args)
  when 'reload'
    reload
  end
end

#reload ⇒ Object 



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# File 'lib/volt/page/tasks.rb', line 63

def reload
  # Stash the current page value
  value = JSON.dump($page.page.cur.to_h.reject {|k,v| v.reactive? })

  # If this browser supports session storage, store the page, so it will
  # be in the same state when we reload.
  if `sessionStorage`
    `sessionStorage.setItem('___page', value);`
  end

  $page.page._reloading = true
  `window.location.reload(false);`
end

#response(callback_id, result, error) ⇒ Object

When a request is sent to the backend, it can attach a callback, this is called from the backend to pass to the callback.



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# File 'lib/volt/page/tasks.rb', line 43

def response(callback_id, result, error)
  callback = @callbacks.delete(callback_id)

  if callback
    if error
      # TODO: full error handling
      puts "Error2: #{error.inspect}"
    else
      callback.call(result)
    end
  end
end