{"id":36743,"date":"2022-08-17T12:35:13","date_gmt":"2022-08-17T10:35:13","guid":{"rendered":"https:\/\/wp.test-leogistics.com\/?p=36743"},"modified":"2022-08-19T11:23:40","modified_gmt":"2022-08-19T09:23:40","slug":"abap-push-channels-apc-performance","status":"publish","type":"post","link":"https:\/\/leogistics.com\/en\/blog-en\/abap-push-channels-apc-performance\/","title":{"rendered":"Goodbye to Scanning – How ABAP Push Channels (APC) Can Improve Warehouse Performance"},"content":{"rendered":"\t\t
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Push-based communication streamlines<\/b> many processes in EWM-controlled warehouses<\/b> <\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tIn the context of the digitalization of warehouse processes, the flow of information between user and warehouse management software plays a major role. How do we ensure that the information for the employees is always up to date? How does this work, especially when there is an initial data pull when an app is opened and circumstances can change at short notice? The solution to this problem is not complicated, it just needs to be considered at the very beginning of an app’s design.\u00a0\u00a0<\/strong>\r\n\r\nA major added value of UI5 technology is the use of APC. With this, messages can be displayed on the user’s screen in real time, so that there is no delay whatsoever.\u00a0<\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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ABAP Push Channels<\/b> - what is it all about? <\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tABAP Channels are intended to enable users of an SAP system to receive and send messages with a terminal device. ABAP Push Channels <\/span>in particular enable<\/span> ABAP programs to communicate bidirectionally with the Internet. This takes place via <\/span>WebSockets<\/span> or TCP sockets. Both are based on the TCP protocol, which, unlike HTTP, which is commonly used on the World Wide Web, also allows push communication. Whereas with the pull principle every response from a server requires a previous request from a client, with the push principle an open connection between client and server is sufficient. This enables communication between the central system, such as SAP EWM, and various end devices such as scanners in the warehouse.<\/span><\/span>\u00a0<\/span>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Interaction of APC and UI5<\/b><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The communication of UI5 applications and the SAP system normally takes place from the direction of the UI5 application. If the application is opened or an interaction takes place, then communication with the SAP system can occur in response. In UI5 applications, this communication typically takes place via OData services. These services are stateless. This means that the communication channel is taken down again after the data has been exchanged. There is therefore no permanent connection between the user interface and the SAP system.\u00a0<\/span>\u00a0<\/span><\/p>

If the SAP system now has news for the users, it cannot recognize whether they are currently logged in at all. In the first step, a manual or automatic refresh can now be implemented. So again an action has to happen on the interface for communication to take place.\u00a0<\/span><\/p>

But how can we trigger communication from the SAP system? This is where the ABAP Push Channels come into play. These are based on a Web service that, unlike OData services, is not stateless but persists permanently. The SAP system therefore knows all connected end devices. If a change occurs in the SAP system that is of interest to the interfaces, a message can be sent via the APC. The advantages of this solution are obvious:\u00a0<\/span>\u00a0<\/span><\/p>