WebSocket-Enabled Peer Sample Clauses

WebSocket-Enabled Peer to-Peer Communication In real-time communication systems latency is very important issue. Therefore, middleware should be capable of delivering messages on time among different services or sensors. Traditional HTTP based approaches use HTTP polling or HTP long-polling techniques in order to communicate among clients and servers. The polling approach is a straightforward way to obtain new real-time communication on the Web with no need of utilisation of non-standard mechanism. The basic idea for polling is that the client makes periodical request to the server through the standard HTTP(S) ports, and the server sends data within the response in case there is data. For long polling, on the other hand, a client establishes a connection to the server and the connection is retained open until new data is available or a timeout occurs. Once the client receives a response to the request a new connection to the server is established. However, while with utilisation of these techniques an application must repeat HTTP headers in each request and response between client and server; this may lead to greater communication cost depending on the application. WebSockets are amongst the technologies which have been introduced by HTML5, and cuts down on latency simply because it doesn't rely on request and response mechanism as in Restful architectures. WebSockets enables to have full-duplex communication via a single socket between a client and a remote server. Thus, this technology minimizes the quantity of opening ports on server sides compare with the traditional means of sending or retrieving messages (Xxxxxxxx & Xxxxxxxxx, 2012) (Xxxxxxx & Xxxxx, 2012) (Xxx & Xxx, 2012). Figure 9 illustrates the differences in the communication architectures of polling, long polling and WebSocket models. Poll Ob servation Poll Observation Poll Observation Server Client Server Server Client Client Poll Observation idle Observation Poll Observation Observation time time time Figure 9 – The message exchange models of HTTP Polling (left), HTTP Long Polling (centre), and WebSocket protocols The emergence of WebSocket protocol has brought new alternatives to support on the Web, such as XMPP and STOMP. These are application level protocols for exchanging information between any network entities in near real-time; and their main purpose is to address the issues with instant messaging (IM) and presence applications of that time. XMPP exchanges messages in form of XML stanzas and bodies are rest...
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Related to WebSocket-Enabled Peer

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