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require 'active_support/callbacks'
require 'active_support/core_ext/module/attribute_accessors_per_thread'
require 'concurrent'
module ActionCable
module Server
# Worker used by Server.send_async to do connection work in threads. Only for internal use.
class Worker
include ActiveSupport::Callbacks
thread_mattr_accessor :connection
define_callbacks :work
include ActiveRecordConnectionManagement
def initialize(max_size: 5)
@pool = Concurrent::ThreadPoolExecutor.new(
min_threads: 1,
max_threads: max_size,
max_queue: 0,
)
end
def async_invoke(receiver, method, *args)
@pool.post do
invoke(receiver, method, *args)
end
end
def invoke(receiver, method, *args)
begin
self.connection = receiver
run_callbacks :work do
receiver.send method, *args
end
rescue Exception => e
logger.error "There was an exception - #{e.class}(#{e.message})"
logger.error e.backtrace.join("\n")
receiver.handle_exception if receiver.respond_to?(:handle_exception)
ensure
self.connection = nil
end
end
def async_run_periodic_timer(channel, callback)
@pool.post do
run_periodic_timer(channel, callback)
end
end
def run_periodic_timer(channel, callback)
begin
self.connection = channel.connection
run_callbacks :work do
callback.respond_to?(:call) ? channel.instance_exec(&callback) : channel.send(callback)
end
ensure
self.connection = nil
end
end
private
def logger
ActionCable.server.logger
end
end
end
end
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