forked from mirror/MCSManager
61 lines
1.8 KiB
JavaScript
61 lines
1.8 KiB
JavaScript
//一个专门为了解决内存泄露而设计的观察者模型
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const observerMask = {};
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const CALLBACK = 'CALLBACK';
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const CALLBACK_NAME = 'CALLBACK_NAME'
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const FUNCTION_END = '__FUNCTI0N_END__'
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module.exports.FUNCTION_END = FUNCTION_END;
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//监听
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module.exports.listener = function (event, _callbackName, _callback) {
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let callbackName = '';
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let callback = null;
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if (_callback != undefined) {
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callbackName = _callbackName;
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callback = _callback;
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} else {
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callback = _callbackName;
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}
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let listTmp = observerMask[event];
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let callbackConfig = {};
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callbackConfig[CALLBACK_NAME] = callbackName;
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callbackConfig[CALLBACK] = callback;
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if (observerMask.hasOwnProperty(event)) {
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observerMask[event].push(callbackConfig);
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return true;
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}
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observerMask[event] = [callbackConfig];
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return false;
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}
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//触发
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module.exports.emit = function (event, msg) {
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if (observerMask.hasOwnProperty(event)) {
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for (var i in observerMask[event]) {
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let returnV = observerMask[event][i][CALLBACK](msg);
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if (returnV && returnV === FUNCTION_END) {
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//如果函数返回 FUNCTION_END，移除监听
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delete observerMask[event][i][CALLBACK];
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delete observerMask[event][i];
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}
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}
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return true;
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}
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return false;
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}
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//移除监听
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module.exports.remove = function (event, callbackName) {
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if (observerMask.hasOwnProperty(event)) {
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for (var i in observerMask[event]) {
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if (observerMask[event][i][CALLBACK_NAME] = callbackName) {
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delete observerMask[event][i][CALLBACK];
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delete observerMask[event][i];
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return true;
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}
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}
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}
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return false;
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} |