faye-1.1.2/lib/faye/engines/memory.rb
module Faye
module Engine
class Memory
include Timeouts
def self.create(server, options)
new(server, options)
end
def initialize(server, options)
@server = server
@options = options
reset
end
def disconnect
reset
remove_all_timeouts
end
def reset
@namespace = Namespace.new
@clients = {}
@channels = {}
@messages = {}
end
def create_client(&callback)
client_id = @namespace.generate
@server.debug('Created new client ?', client_id)
ping(client_id)
@server.trigger(:handshake, client_id)
callback.call(client_id)
end
def destroy_client(client_id, &callback)
return unless @namespace.exists?(client_id)
if @clients.has_key?(client_id)
@clients[client_id].each { |channel| unsubscribe(client_id, channel) }
end
remove_timeout(client_id)
@namespace.release(client_id)
@messages.delete(client_id)
@server.debug('Destroyed client ?', client_id)
@server.trigger(:disconnect, client_id)
@server.trigger(:close, client_id)
callback.call if callback
end
def client_exists(client_id, &callback)
callback.call(@namespace.exists?(client_id))
end
def ping(client_id)
timeout = @server.timeout
return unless Numeric === timeout
@server.debug('Ping ?, ?', client_id, timeout)
remove_timeout(client_id)
add_timeout(client_id, 2 * timeout) { destroy_client(client_id) }
end
def subscribe(client_id, channel, &callback)
@clients[client_id] ||= Set.new
should_trigger = @clients[client_id].add?(channel)
@channels[channel] ||= Set.new
@channels[channel].add(client_id)
@server.debug('Subscribed client ? to channel ?', client_id, channel)
@server.trigger(:subscribe, client_id, channel) if should_trigger
callback.call(true) if callback
end
def unsubscribe(client_id, channel, &callback)
if @clients.has_key?(client_id)
should_trigger = @clients[client_id].delete?(channel)
@clients.delete(client_id) if @clients[client_id].empty?
end
if @channels.has_key?(channel)
@channels[channel].delete(client_id)
@channels.delete(channel) if @channels[channel].empty?
end
@server.debug('Unsubscribed client ? from channel ?', client_id, channel)
@server.trigger(:unsubscribe, client_id, channel) if should_trigger
callback.call(true) if callback
end
def publish(message, channels)
@server.debug('Publishing message ?', message)
clients = Set.new
channels.each do |channel|
next unless subs = @channels[channel]
subs.each(&clients.method(:add))
end
clients.each do |client_id|
@server.debug('Queueing for client ?: ?', client_id, message)
@messages[client_id] ||= []
@messages[client_id] << Faye.copy_object(message)
empty_queue(client_id)
end
@server.trigger(:publish, message['clientId'], message['channel'], message['data'])
end
def empty_queue(client_id)
return unless @server.has_connection?(client_id)
@server.deliver(client_id, @messages[client_id])
@messages.delete(client_id)
end
end
end
end