![]() On success, the service returns a package ID that uniquely identifies that JAR file within the service. Therefore, a better idea is to ask a collaborator to do the validation.Unlike the CLI or the platform portal deployment process, deployment by API requires that the pipeline JAR file be uploaded to the service as a separate step. Having the validation inside the Searcher will most probably add a reason for the Searcher to change whenever we want to update the validation criteria. We can judge whether it makes sense to make the validation inside the Searcher or distribute that responsibility to a collaborator. We don’t need to think about what makes the query valid or invalid at this stage, but it’s essential to consider that some validation will happen. Let’s assume that in our example, we might not perform a search when the query is not valid so that we won’t waste resources. Next, we can start thinking about the internals, having in mind the requirements we have in hand. The AT focuses on the input and the output of our system. Identifying the outside is the first step towards shaping our Acceptance Test. In terms of mobile, considering the uni-directional data flow is quite handy because it will naturally help us make the UI very simple and not contain any logic inside. In this case, we name the somewhere as Searcher. The screen has to send the query somewhere, and it has to receive the states to render from somewhere too. In this example, we have a screen that could fire up a query and render state (uni-directional data flow), so we could look at the screen as the outside of the system. Getting startedĪs we saw in the examples, we start by identifying the outside of the unit we are about to build. It is a search functionality on a mobile app, so let’s see how to draw a sequence diagram for that particular feature. The example we would use for the rest of the article is the same example I use in the screencast series I’ve recorded, that you can find in the screencast section. Then, we could think about the internals, like the controller that would unpack the request and pass the data into a service that will talk to the persistence, and based on the persisting result, we would form a response and reply it to the caller. So we can start looking at the possible request that we would receive and the response we might return as the outside of the system. Follow a User APIĪnother example would be an API on our REST backend system that we could use to establish a follow between users. We would think about the communication between them. We would think about splitting these responsibilities into suitable collaborators. Next, we would start thinking about different responsibilities this unit will have (like calculation of progress, persisting the progress of the current download, download continuation after a failure, etc.). In that case, most probably, the input would be some URL where the file exists, and the output would be, for example, the current downloading progress, download success and a possible failure, etc. Suppose we are about to build a file downloading feature. Let’s look at some examples: File Downloader The first thing we have to do when coming up with a sequence diagram is to identify the outside of the unit we will build. The essence of the sequence diagram is to visualize that idea, nothing more than that. Before we work on anything, we certainly know or have an idea of where to start and where we want to go. Sequence Diagram Example What’s this Sequence Diagram thingy?Īs mentioned in the disclaimer, the sequence diagram is a tool we can use to visualize an approximation of where we want to go when working on the unit in question.
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