{"id":9959,"date":"2015-07-25T18:45:42","date_gmt":"2015-07-25T22:45:42","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/?p=9959"},"modified":"2015-11-10T08:30:28","modified_gmt":"2015-11-10T13:30:28","slug":"%e0%a6%a8%e0%a7%8b%e0%a6%a1-%e0%a6%9c%e0%a7%87%e0%a6%8f%e0%a6%b8-%e0%a5%a4-node-js-%e0%a6%87%e0%a6%ad%e0%a7%87%e0%a6%a8%e0%a7%8d%e0%a6%9f-%e0%a6%b2%e0%a7%81%e0%a6%aa","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=9959","title":{"rendered":"\u09a8\u09cb\u09a1.\u099c\u09c7\u098f\u09b8 \u0964 Node.js – \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09b2\u09c1\u09aa (Node.js – Event Loop)"},"content":{"rendered":"

\u09b0\u09bf\u09a6\u0993\u09df\u09be\u09a8 \u09ac\u09bf\u09a8 \u09b6\u09be\u09ae\u09c0\u09ae<\/p>\n

 <\/p>\n

\u09a8\u09a1 \u099c\u09c7\u098f\u09b8 \u098f\u0995\u0995 \u09a5\u09cd\u09b0\u09c7\u09a1 \u098f\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u0995\u09bf\u09a8\u09cd\u09a4\u09c1 \u098f\u099f\u09bf \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0993 \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995\u09c7\u09b0 \u09b8\u09ae\u09a8\u09cd\u09ac\u09df\u09c7\u09b0 \u09a7\u09be\u09b0\u09a8\u09be\u09df \u09b8\u09ae\u09b0\u09cd\u09a5\u09a8 \u0995\u09b0\u09c7\u0964 \u09af\u09c7\u09b9\u09c7\u09a4\u09c1 \u09a8\u09a1 \u099c\u09c7\u098f\u09b8\u09c7\u09b0 \u09aa\u09cd\u09b0\u09a4\u09bf\u099f\u09bf \u098f\u09aa\u09bf\u0986\u0987 \u0985\u09b8\u09ae\u09a8\u09cd\u09ac\u09bf\u09a4 \u0993 \u098f\u0995\u0995 \u09a5\u09cd\u09b0\u09c7\u09a1\u09c7\u09b0, \u09a4\u09be\u0987 \u098f\u09b0\u09be \u09ab\u09be\u0982\u09b6\u09a8 \u0995\u09b2 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09c7 \u09b8\u09ae\u09a8\u09cd\u09ac\u09df \u09b8\u09be\u09a7\u09a8\u09c7\u09b0 \u099c\u09a8\u09cd\u09af\u0964 \u09a8\u09a1 \u0985\u09ac\u099c\u09be\u09b0\u09ad\u09be\u09b0 \u09aa\u09cd\u09af\u09be\u099f\u09be\u09b0\u09cd\u09a8 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09c7\u0964 \u09a8\u09a1 \u09a5\u09cd\u09b0\u09c7\u09a1 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09b2\u09c1\u09aa \u09b0\u09be\u0996\u09c7, \u09af\u0996\u09a8 \u0995\u09cb\u09a8\u0993 \u099f\u09be\u09b8\u09cd\u0995 \u09b8\u09ae\u09cd\u09aa\u09a8\u09cd\u09a8 \u09b9\u09df \u098f\u099f\u09bf \u09b8\u0982\u09b6\u09cd\u09b2\u09bf\u09b7\u09cd\u099f \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u0995\u09c7 \u09ac\u09be\u09a4\u09bf\u09b2 \u0995\u09b0\u09c7 \u09a6\u09c7\u09df \u09af\u09be \u0995\u09bf\u09a8\u09be \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09b2\u09bf\u09b8\u09a8\u09be\u09b0 \u09ab\u09be\u0982\u09b6\u09a8\u0995\u09c7 \u099f\u09be\u09b8\u09cd\u0995 \u09b8\u09ae\u09cd\u09aa\u09be\u09a6\u09a8\u09c7\u09b0 \u09b8\u09bf\u0997\u09a8\u09cd\u09af\u09be\u09b2 \u09aa\u09be\u09a0\u09be\u09df\u0964<\/p>\n

\u0987\u09ad\u09c7\u09a8\u09cd\u099f\u09ad\u09bf\u09a4\u09cd\u09a4\u09bf\u0995 \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae\u09bf\u0982<\/h2>\n

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\u0987\u09ad\u09c7\u09a8\u09cd\u099f\u09ad\u09bf\u09a4\u09cd\u09a4\u09bf\u0995 \u098f\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8\u09c7 \u098f\u0995\u099f\u09bf \u09ae\u09c7\u0987\u09a8 \u09b2\u09c1\u09aa \u09a5\u09be\u0995\u09c7 \u09af\u09be \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u09c7\u09b0 \u09b8\u09a8\u09cd\u09a7\u09be\u09a8 \u0995\u09b0\u09c7, \u09aa\u09be\u0993\u09df\u09be \u0997\u09c7\u09b2\u09c7 \u09a4\u09be\u0995\u09c7 \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995 \u09ab\u09be\u0982\u09b6\u09a8\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09b8\u09ae\u09a8\u09cd\u09ac\u09df \u0995\u09b0\u09bf\u09df\u09c7 \u09a6\u09c7\u09df\u0964<\/p>\n

\"Event<\/p>\n

\u0987\u09ad\u09c7\u09a8\u09cd\u099f\u0995\u09c7 \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995\u09c7\u09b0 \u09b8\u09ae\u09a4\u09c1\u09b2\u09cd\u09af \u09ae\u09a8\u09c7 \u09b9\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7, \u09ae\u09c2\u09b2\u09a4 \u09aa\u09be\u09b0\u09cd\u09a5\u0995\u09cd\u09af \u09b9\u09b2, \u0985\u09b8\u09ae\u09a8\u09cd\u09ac\u09bf\u09a4 \u09ab\u09be\u0982\u09b6\u09a8\u09c7\u09b0 \u09ab\u09b2\u09be\u09ab\u09b2 \u09ab\u09c7\u09b0\u09a4 \u0986\u09b8\u09b2\u09c7 \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995 \u09ab\u09be\u0982\u09b6\u09a8 \u0995\u09be\u099c \u0995\u09b0\u09c7, \u0986\u09b0 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0985\u09ac\u099c\u09be\u09b0\u09ad\u09be\u09b0 \u09aa\u09cd\u09af\u09be\u099f\u09be\u09b0\u09cd\u09a8\u09c7 \u0995\u09be\u099c \u0995\u09b0\u09c7\u0964 \u09af\u09c7\u09b8\u09ac \u09ab\u09be\u0982\u09b6\u09a8 \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u0995\u09c7 \u09b6\u09cb\u09a8\u09c7 \u09a4\u09be\u09b0\u09be \u0985\u09ac\u099c\u09be\u09b0\u09ad\u09be\u09b0\u09b0\u09c2\u09aa\u09c7 \u0995\u09be\u099c \u0995\u09b0\u09c7\u0964 \u0995\u09cb\u09a8\u0993 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09ac\u09be\u09a6 \u09aa\u09b0\u09b2\u09c7 \u09a4\u09be\u09b0 \u09b2\u09bf\u09b8\u09a8\u09be\u09b0 \u09ab\u09be\u0982\u09b6\u09a8 \u09b8\u09ae\u09cd\u09aa\u09be\u09a6\u09a8 \u09b6\u09c1\u09b0\u09c1 \u0995\u09b0\u09c7\u0964<\/p>\n

\u09a8\u09a1 \u099c\u09c7\u098f\u09b8\u09c7\u09b0 \u0985\u09a8\u09c7\u0995\u0997\u09c1\u09b2\u09bf \u09ac\u09bf\u09b2\u09cd\u099f \u0987\u09a8 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0986\u099b\u09c7 \u09af\u09be events \u09ae\u09a1\u09bf\u0989\u09b2\u09c7\u09b0 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 \u09aa\u09be\u0993\u09df\u09be \u09af\u09be\u09df \u098f\u09ac\u0982 EventEmitter \u0995\u09cd\u09b2\u09be\u09b8 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0993 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09b2\u09bf\u09b8\u09a8\u09be\u09b0\u09c7\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u09b8\u09ae\u09a8\u09cd\u09ac\u09df \u09b8\u09be\u09a7\u09a8 \u0995\u09b0\u09c7\u0964<\/p>\n

\n
\/\/ Import events module\r\n var events = require('events');\r\n \/\/ Create an eventEmitter object\r\n var eventEmitter = new events.EventEmitter();<\/pre>\n
\n
 <\/p>\n
\u09a8\u09bf\u099a\u09c7\u09b0 \u09b8\u09bf\u09a8\u099f\u09cd\u09af\u09be\u0995\u09cd\u09b8 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0993 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09b9\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09b2\u09be\u09b0\u09c7\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u09b8\u09ae\u09a8\u09cd\u09ac\u09df \u09b8\u09be\u09a7\u09a8 \u0995\u09b0\u09c7,<\/p>\n
\n
\/\/ Bind event and even handler as follows\r\n eventEmitter.on('eventName', eventHandler);<\/pre>\n
\n
 <\/p>\n
\u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae\u09bf\u0999\u09c7\u09b0 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 \u0995\u09cb\u09a8\u0993 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09ac\u09be\u09a6 \u09a6\u09bf\u09a4\u09c7,<\/p>\n
\n
\/\/ Fire an event\r\n eventEmitter.emit('eventName');<\/pre>\n
\n
 <\/p>\n
\u0989\u09a6\u09be\u09b9\u09b0\u09a3,
\nmain.js \u09a8\u09be\u09ae\u09c7\u09b0 \u099c\u09c7\u098f\u09b8 \u09ab\u09be\u0987\u09b2 \u09a4\u09c8\u09b0\u09bf \u0995\u09b0\u09bf \u09af\u09be\u09a4\u09c7 \u09a8\u09bf\u099a\u09c7\u09b0 \u0995\u09cb\u09a1 \u09a5\u09be\u0995\u09ac\u09c7,<\/p>\n
\n
\/\/ Import events module\r\nvar events = require('events');\r\n\/\/ Create an eventEmitter object\r\nvar eventEmitter = new events.EventEmitter();<\/pre>\n
\/\/ Create an event handler as follows\r\nvar connectHandler = function connected() {\r\n     console.log('connection succesful.'); \r\n\r\n     \/\/ Fire the data_received event \r\n     eventEmitter.emit('data_received');\r\n}<\/pre>\n
\/\/ Bind the connection event with the handler\r\neventEmitter.on('connection', connectHandler);\r\n \r\n\/\/ Bind the data_received event with the anonymous function\r\neventEmitter.on('data_received', function(){\r\n     console.log('data received succesfully.');\r\n});<\/pre>\n
\/\/ Fire the connection event \r\neventEmitter.emit('connection');<\/pre>\n
console.log(\"Program Ended.\");<\/pre>\n
\n
 <\/p>\n
\u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae\u099f\u09bf \u09b0\u09be\u09a8 \u0995\u09b0\u09bf\u09df\u09c7 \u0986\u0989\u099f\u09aa\u09c1\u099f \u09aa\u09be\u09ac,<\/p>\n
\n
$ mnode main.js<\/pre>\n
\n
 <\/p>\n
\u098f\u099f\u09bf \u09af\u09c7 \u09ab\u09b2\u09be\u09ab\u09b2 \u09a6\u09c7\u0996\u09be\u09ac\u09c7,<\/p>\n
\n
 connection succesful.\r\n data received succesfully.\r\n Program Ended.<\/pre>\n
\n
 <\/p>\n
\u09af\u09c7\u09ad\u09be\u09ac\u09c7 \u09a8\u09a1 \u098f\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u0995\u09be\u099c \u0995\u09b0\u09c7\u0983 \u0985\u09b8\u09ae\u09a8\u09cd\u09ac\u09bf\u09a4 \u09ab\u09be\u0982\u09b6\u09a8 \u09b6\u09c7\u09b7 \u09aa\u09cd\u09af\u09be\u09b0\u09be\u09ae\u09bf\u099f\u09be\u09b0\u09b0\u09c2\u09aa\u09c7 \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995\u0995\u09c7 \u0997\u09cd\u09b0\u09b9\u09a3 \u0995\u09b0\u09c7, \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995 \u098f\u09b0\u09b0\u0995\u09c7 \u09aa\u09cd\u09b0\u09a5\u09ae \u09aa\u09cd\u09af\u09be\u09b0\u09be\u09ae\u09bf\u099f\u09be\u09b0\u09b0\u09c2\u09aa\u09c7 \u0997\u09cd\u09b0\u09b9\u09a3 \u0995\u09b0\u09c7\u0964 \u09aa\u09c2\u09b0\u09cd\u09ac\u09c7\u09b0 \u0989\u09a6\u09be\u09b9\u09b0\u09a3\u09c7\u09b0 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 \u0986\u09ac\u09be\u09b0 \u09a6\u09c7\u0996\u09be \u09af\u09be\u0995, input.txt \u09a8\u09be\u09ae\u09c7 \u098f\u0995\u099f\u09bf \u09ab\u09be\u0987\u09b2 \u09a4\u09c8\u09b0\u09bf \u0995\u09b0\u09bf, \u09af\u09be\u09a4\u09c7 \u09a8\u09bf\u099a\u09c7\u09b0 \u0995\u09cb\u09a1 \u09a5\u09be\u0995\u09ac\u09c7\u0964<\/p>\n
\n
Tutorials Point is giving self learning content\r\n to teach the world in simple and easy way!!!!!<\/pre>\n
\n
 <\/p>\n
main.js \u09a8\u09be\u09ae\u09c7\u09b0 \u09ab\u09be\u0987\u09b2 \u09a4\u09c8\u09b0\u09bf \u0995\u09b0\u09bf \u09af\u09be\u09a4\u09c7 \u09a8\u09bf\u099a\u09c7\u09b0 \u0995\u09cb\u09a1 \u09a5\u09be\u0995\u09ac\u09c7\u0964<\/p>\n
\n
var fs = require(\"fs\");\r\n\r\nfs.readFile('input.txt', function (err, data) {\r\n\u00a0\u00a0 if (err){\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 console.log(err.stack);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 return;\r\n\u00a0\u00a0 }\r\n\u00a0\u00a0 console.log(data.toString());\r\n});\r\nconsole.log(\"Program Ended\");<\/pre>\n
\n
\u098f\u0996\u09be\u09a8\u09c7 fs.readFile() \u0985\u09b8\u09ae\u09a8\u09cd\u09ac\u09bf\u09a4 \u09ab\u09be\u0982\u09b6\u09a8 \u09af\u09be\u09b0 \u0995\u09be\u099c \u09b9\u09b2 \u09ab\u09be\u0987\u09b2 \u09aa\u09dc\u09be\u0964 \u098f\u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u09c7 \u09ad\u09c1\u09b2 \u09b9\u09b2\u09c7 err \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f \u09a6\u09cd\u09ac\u09be\u09b0\u09be \u09b8\u09c7\u099f\u09bf readFile \u098f\u09b0 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995 \u09ab\u09be\u0982\u09b6\u09a8\u09c7 \u09af\u09be\u09ac\u09c7\u0964<\/pre>\n
\n
 Program Ended\r\n Tutorials Point is giving self learning content\r\n to teach the world in simple and easy way!!!!!<\/pre>\n
\n
 <\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
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