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local log = require "mason-core.log"
---@class EventEmitter
---@field private __event_handlers table<any, table<fun(), fun()>>
---@field private __event_handlers_once table<any, table<fun(), fun()>>
local EventEmitter = {}
EventEmitter.__index = EventEmitter
function EventEmitter:new()
local instance = {}
setmetatable(instance, self)
instance.__event_handlers = {}
instance.__event_handlers_once = {}
return instance
end
---@generic T
---@param obj T
---@return T
function EventEmitter.init(obj)
obj.__event_handlers = {}
obj.__event_handlers_once = {}
return obj
end
---@param event any
---@param handler fun(...): any
local function call_handler(event, handler, ...)
local ok, err = pcall(handler, ...)
if not ok then
log.fmt_warn("EventEmitter handler failed for event %s with error %s", event, err)
end
end
---@param event any
function EventEmitter:emit(event, ...)
if self.__event_handlers[event] then
for handler in pairs(self.__event_handlers[event]) do
call_handler(event, handler, ...)
end
end
if self.__event_handlers_once[event] then
for handler in pairs(self.__event_handlers_once[event]) do
call_handler(event, handler, ...)
self.__event_handlers_once[event][handler] = nil
end
end
return self
end
---@param event any
---@param handler fun(payload: any)
function EventEmitter:on(event, handler)
if not self.__event_handlers[event] then
self.__event_handlers[event] = {}
end
self.__event_handlers[event][handler] = handler
return self
end
---@param event any
---@param handler fun(payload: any)
function EventEmitter:once(event, handler)
if not self.__event_handlers_once[event] then
self.__event_handlers_once[event] = {}
end
self.__event_handlers_once[event][handler] = handler
return self
end
---@param event any
---@param handler fun(payload: any)
function EventEmitter:off(event, handler)
if self.__event_handlers[event] then
self.__event_handlers[event][handler] = nil
end
if self.__event_handlers_once[event] then
self.__event_handlers_once[event][handler] = nil
end
return self
end
---@private
function EventEmitter:__clear_event_handlers()
self.__event_handlers = {}
self.__event_handlers_once = {}
end
return EventEmitter
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