As we know "WhatsApp" is a very popular messaging app, which is a mobile app. WhatsApp is the most popular application used for message and chatting all over the world. Following the messaging app, WhatsApp is the most demanded that has revolutionized the messaging app market. Many attempts have been made in vain to clone WhatsApp as a chat app, but none of them yielded the result. Nevertheless introducing similar functionalities, no chat app has ever been able to topple WhatsApp’s supremacy as a chat app.
The Ejabberd (XMPP) server is used by WhatsApp which facilitates instant message transfer between two or many users on a real-time basis. Advance reliableness and sustainability even under peak traffic the reason why WhatsApp developers chose Ejabberd above anything else. We know the programming language that has been used to create WhatsApp applications by the name of "Erlang". The Code restructuring and some important changes were made to the Ejabberd server to achieve optimal server performance. It is what helps WhatsApp to quickly push the changes to live implementation without requiring restarts.
Where the Erlang programming language is a general-purpose, simultaneous and garbage-collected programming language, which also serves as a runtime system. It is a dynamic language with the sequential derivative firm calculation of Erlang, single assignment and dynamic data entry, which concurrently follows the actor model. This is developed by Joe Armstrong in 1986, The Erlang was first released by Ericsson as a possessive language, then released in 1998 as an open source language. Ericsson designed Erlang to support distributed, fault-tolerant, soft-real-time, and non-stop applications. And Erlang supports hot swapping; this code can be replaced without restarting the system.
1. Insights on data transfer in WhatsApp
The WA (WhatsApp) manages over 50 billion messages a day. A key to smooth data processing lies with the message queue length. A length of the message queue of all the processes associated with a node is monitored. In the case of multimedia messages, contents (audio, video, or image) are uploaded into an HTTP server and are linked with the content and then sent to the receiving node (receiver) in the form of a thumbnail. Content can be viewed or rejected based on the user's preference.
2. The protocol used by WhatsApp
The Elementary, protocol in use is XMPP (Extensible Messaging and Presence Protocol). The DSL ensures network security and also helps in preventing private data transfer. When the message is sent, this is the line (queued) on the server. A message will wait in the queue until the recipient reconnects to receive the message. When a message is sent, the sender is notified by the double check mark near the message. Then After the delivery, every message is instantly deleted from the server memory. These instant deletions from server memory help WhatsApp keep its resources to a bare minimum. As well, WhatsApp uses HTML5 Web-Sockets which communication technology which facilitates two-way communication.
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