{"id":9961,"date":"2015-07-26T18:34:51","date_gmt":"2015-07-26T22:34:51","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/?p=9961"},"modified":"2015-11-10T08:29:52","modified_gmt":"2015-11-10T13:29:52","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%87%e0%a6%ae%e0%a6%bf%e0%a6%9f%e0%a6%be%e0%a6%b0-e","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=9961","title":{"rendered":"\u09a8\u09cb\u09a1 . \u099c\u09c7 \u098f\u09b8 \u0964 Node.js – \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0 (Event Emitter)"},"content":{"rendered":"

\u09a8\u09a1 \u099c\u09c7\u098f\u09b8\u0983 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0
\n\u09b0\u09bf\u09a6\u0993\u09df\u09be\u09a8 \u09ac\u09bf\u09a8 \u09b6\u09be\u09ae\u09c0\u09ae<\/p>\n

\u09a8\u09a1 \u0987\u09ae\u09bf\u099f \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u09c7\u09b0 \u0985\u09a8\u09c7\u0995 \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f \u09af\u09c7\u09ae\u09a8 net.Server \u098f\u09b0 \u09b8\u09be\u09a5\u09c7 \u0995\u09cb\u09a8\u0993 \u09b8\u09a6\u09c3\u09b6 \u09aa\u09bf\u09df\u09be\u09b0 \u09af\u09c1\u0995\u09cd\u09a4 \u09b9\u09b2\u09c7 \u0995\u09cb\u09a8\u0993 \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u0995\u09c7 \u0987\u09ae\u09bf\u099f \u0995\u09b0\u09c7\u0964 fs.readStream \u0995\u09cb\u09a8\u0993 \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u0995\u09c7 \u0987\u09ae\u09bf\u099f \u0995\u09b0\u09c7 \u09af\u0996\u09a8 \u098f\u09b0 \u09ab\u09be\u0987\u09b2 \u0996\u09cb\u09b2\u09be \u09a5\u09be\u0995\u09c7\u0964 events.EventEmitter \u09b8\u09ac \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f \u09b9\u0993\u09df\u09be\u09b0 \u0989\u09a6\u09be\u09b9\u09b0\u09a3\u0964<\/p>\n

\u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0\u09c7\u09b0 \u09b6\u09cd\u09b0\u09c7\u09a3\u09c0\u0983 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0\u09c7\u09b0 \u09b6\u09cd\u09b0\u09c7\u09a3\u09c0 events module \u09a4\u09c7 \u09ac\u09cd\u09af\u09aa\u09bf\u09a4 \u09a5\u09be\u0995\u09c7\u0964<\/p>\n

\u09a8\u09bf\u099a\u09c7 \u0989\u09a6\u09be\u09b9\u09b0\u09a3 \u09a6\u09c7\u09df\u09be \u09b9\u09b2,<\/p>\n

\/\/ Import events module
\nvar events = require(‘events’);
\n\/\/ Create an eventEmitter object
\nvar eventEmitter = new events.EventEmitter();<\/p>\n

\u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0\u09c7\u09b0 \u0995\u09cb\u09a8\u0993 \u09aa\u09b0\u09cd\u09af\u09be\u09df\u09c7 \u09ad\u09c1\u09b2 \u09a6\u09c7\u0996\u09be \u09a6\u09bf\u09b2\u09c7 ‘error’ \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09a6\u09c7\u0996\u09be\u09a8\u09cb \u09b9\u09df\u0964 \u09a8\u09a4\u09c1\u09a8 \u09b2\u09bf\u09b8\u09a8\u09be\u09b0 \u09af\u09cb\u0997 \u09b9\u09b2\u09c7 ‘newListener’ \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0986\u09b0 \u0995\u09cb\u09a8\u0993 \u09b2\u09bf\u09b8\u09a8\u09be\u09b0 \u09ae\u09c1\u099b\u09c7 \u09ab\u09c7\u09b2\u09b2\u09c7 ‘removeListener’ \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09aa\u09cd\u09b0\u09a6\u09b0\u09cd\u09b6\u09bf\u09a4 \u09b9\u09df\u0964 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0 on \u0993 emit. \u098f\u09b0 \u09ae\u09a4 \u0985\u09a8\u09c7\u0995 \u09ac\u09c8\u09b6\u09bf\u09b7\u09cd\u099f\u09cd\u09af \u09a7\u09be\u09b0\u09a3 \u0995\u09b0\u09c7\u0964<\/p>\n

\u09aa\u09cd\u09b0\u0995\u09cd\u09b0\u09bf\u09df\u09be\u0983<\/p>\n

S.N. \u09aa\u09cd\u09b0\u0995\u09cd\u09b0\u09bf\u09df\u09be
\n1 addListener(event, listener)<\/p>\n

2 on(event, listener)<\/p>\n

3 once(event, listener)<\/p>\n

4 removeListener(event, listener)<\/p>\n

5 removeAllListeners([event])<\/p>\n

6 setMaxListeners(n)<\/p>\n

7 listeners(event)<\/p>\n

8 emit(event, [arg1], [arg2], […])<\/p>\n

\u0995\u09cd\u09b2\u09be\u09b8 \u09ae\u09c7\u09a5\u09a1\u0983
\nS.N. \u09aa\u09cd\u09b0\u0995\u09cd\u09b0\u09bf\u09df\u09be
\n1 listenerCount(emitter, event)<\/p>\n

\u0987\u09ad\u09c7\u09a8\u09cd\u099f\u09b8\u0983
\nS.No. \u0987\u09ad\u09c7\u09a8\u09cd\u099f
\n1 newListener
\n\u2022 event \u2013 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09a8\u09c7\u09ae\u09c7\u09b0 \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0982
\n\u2022 listener \u2013 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09b9\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09c7\u09b2\u09be\u09b0 \u09ab\u09be\u0982\u09b6\u09a8
\n2 removeListener
\n\u2022 event – \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09a8\u09c7\u09ae\u09c7\u09b0 \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0982
\n\u2022 listener – \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09b9\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09c7\u09b2\u09be\u09b0 \u09ab\u09be\u0982\u09b6\u09a8<\/p>\n

\u0989\u09a6\u09be\u09b9\u09b0\u09a3\u0983 \u09a8\u09bf\u099a\u09c7\u09b0 Node.js \u0995\u09cb\u09a1 \u09a6\u09cd\u09ac\u09be\u09b0\u09be main.js \u09a8\u09be\u09ae\u09c7\u09b0 \u09ab\u09be\u0987\u09b2 \u09a4\u09c8\u09b0\u09bf \u0995\u09b0\u09bf,<\/p>\n

var events = require(‘events’);
\nvar eventEmitter = new events.EventEmitter();<\/p>\n

\/\/ listener #1
\nvar listner1 = function listner1() {
\nconsole.log(‘listner1 executed.’);
\n}<\/p>\n

\/\/ listener #2
\nvar listner2 = function listner2() {
\nconsole.log(‘listner2 executed.’);
\n}<\/p>\n

\/\/ Bind the connection event with the listner1 function
\neventEmitter.addListener(‘connection’, listner1);<\/p>\n

\/\/ Bind the connection event with the listner2 function
\neventEmitter.on(‘connection’, listner2);<\/p>\n

var eventListeners = require(‘events’).EventEmitter.listenerCount(eventEmitter,’connection’);
\nconsole.log(eventListeners + ” Listner(s) listening to connection event”);<\/p>\n

\/\/ Fire the connection event
\neventEmitter.emit(‘connection’);<\/p>\n

\/\/ Remove the binding of listner1 function
\neventEmitter.removeListener(‘connection’, listner1);
\nconsole.log(“Listner1 will not listen now.”);<\/p>\n

\/\/ Fire the connection event
\neventEmitter.emit(‘connection’);<\/p>\n

eventListeners = require(‘events’).EventEmitter.listenerCount(eventEmitter,’connection’);
\nconsole.log(eventListeners + ” Listner(s) listening to connection event”);<\/p>\n

console.log(“Program Ended.”);<\/p>\n

\u098f\u0996\u09a8 main.js \u09b0\u09be\u09a8 \u0995\u09b0\u09be\u09b2\u09c7,<\/p>\n

$ node main.js<\/p>\n

\u0986\u0989\u099f\u09aa\u09c1\u099f \u09ad\u09c7\u09b0\u09bf\u09ab\u09be\u0987 \u0995\u09b0\u09c7 \u09a6\u09c7\u0996\u09a4\u09c7 \u09aa\u09be\u09b0\u09bf,<\/p>\n

2 Listner(s) listening to connection event
\nlistner1 executed.
\nlistner2 executed.
\nListner1 will not listen now.
\nlistner2 executed.
\n1 Listner(s) listening to connection event
\nProgram Ended.<\/p>\n

\u09a4\u09a5\u09cd\u09af\u09b8\u09c2\u09a4\u09cd\u09b0\u0983 http:\/\/www.tutorialspoint.com\/nodejs\/nodejs_event_emitter.htm<\/p>\n","protected":false},"excerpt":{"rendered":"

\u09a8\u09a1 \u099c\u09c7\u098f\u09b8\u0983 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0 \u09b0\u09bf\u09a6\u0993\u09df\u09be\u09a8 \u09ac\u09bf\u09a8 \u09b6\u09be\u09ae\u09c0\u09ae \u09a8\u09a1 \u0987\u09ae\u09bf\u099f \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u09c7\u09b0 \u0985\u09a8\u09c7\u0995 \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f \u09af\u09c7\u09ae\u09a8 net.Server \u098f\u09b0 \u09b8\u09be\u09a5\u09c7 \u0995\u09cb\u09a8\u0993 \u09b8\u09a6\u09c3\u09b6 \u09aa\u09bf\u09df\u09be\u09b0 \u09af\u09c1\u0995\u09cd\u09a4 \u09b9\u09b2\u09c7 \u0995\u09cb\u09a8\u0993 \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u0995\u09c7 \u0987\u09ae\u09bf\u099f \u0995\u09b0\u09c7\u0964 fs.readStream \u0995\u09cb\u09a8\u0993 \u0987\u09ad\u09c7\u09a8\u09cd\u099f\u0995\u09c7 \u0987\u09ae\u09bf\u099f \u0995\u09b0\u09c7 \u09af\u0996\u09a8 \u098f\u09b0 \u09ab\u09be\u0987\u09b2 \u0996\u09cb\u09b2\u09be \u09a5\u09be\u0995\u09c7\u0964 events.EventEmitter \u09b8\u09ac \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f \u09b9\u0993\u09df\u09be\u09b0 \u0989\u09a6\u09be\u09b9\u09b0\u09a3\u0964 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0\u09c7\u09b0 \u09b6\u09cd\u09b0\u09c7\u09a3\u09c0\u0983 \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u0987\u09ae\u09bf\u099f\u09be\u09b0\u09c7\u09b0 \u09b6\u09cd\u09b0\u09c7\u09a3\u09c0 events module \u09a4\u09c7 \u09ac\u09cd\u09af\u09aa\u09bf\u09a4 \u09a5\u09be\u0995\u09c7\u0964 \u09a8\u09bf\u099a\u09c7 \u0989\u09a6\u09be\u09b9\u09b0\u09a3 \u09a6\u09c7\u09df\u09be … <\/p>\n

Continue reading<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1384],"tags":[1662],"class_list":["post-9961","post","type-post","status-publish","format-standard","hentry","category-----node-js","tag-1662","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":9959,"url":"http:\/\/bangla.sitestree.com\/?p=9959","url_meta":{"origin":9961,"position":0},"title":"\u09a8\u09cb\u09a1.\u099c\u09c7\u098f\u09b8 \u0964 Node.js – \u0987\u09ad\u09c7\u09a8\u09cd\u099f \u09b2\u09c1\u09aa (Node.js – Event Loop)","author":"Author-Check- Article-or-Video","date":"July 25, 2015","format":false,"excerpt":"\u09b0\u09bf\u09a6\u0993\u09df\u09be\u09a8 \u09ac\u09bf\u09a8 \u09b6\u09be\u09ae\u09c0\u09ae \u00a0 \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\u2026","rel":"","context":"In "\u09a8\u09cb\u09a1 . \u099c\u09c7 \u098f\u09b8 \u0964 Node.js"","block_context":{"text":"\u09a8\u09cb\u09a1 . \u099c\u09c7 \u098f\u09b8 \u0964 Node.js","link":"http:\/\/bangla.sitestree.com\/?cat=1384"},"img":{"alt_text":"Event Driven Programming","src":"https:\/\/i0.wp.com\/www.tutorialspoint.com\/nodejs\/images\/event_loop.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.tutorialspoint.com\/nodejs\/images\/event_loop.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.tutorialspoint.com\/nodejs\/images\/event_loop.jpg?resize=525%2C300 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