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why? calculate sum is used as a quick start template for vangav backend to help new users get to speed within the first 10 minutes; this template covers all the core basics to develop a fully functional backend service without a database

calculate sum

• calculate sum service is generated using vangav backend

prerequisite

• vangav backend tutorials

functionality

• this services takes two floating point numbers as a request and returns the summation of those numbers as a response

overview

• this service is based on vangav backend's calculate sum template
• this service has the 90+% of the vangav backend's generated code + the 10-% of the logic code needed to complete the service

try this service

1. for first timers - follow the steps in the system requirements tutorial
2. for first timers - follow the steps in the workspace initialization tutorial
3. download this vos_calculate_sum.zip project (from the green clone or download button up there) inside the workspace directory created previously (my_services) and unzip it
4. rename unzipped vos_calculate_sum-master to vos_calculate_sum
5. in the terminal cd to vos_calculate_sum
6. start the service: ./_run.sh
7. from your prefered client (we recommned postman) start trying the service; refer to the features and service references sections for reference

• at the end to stop the service: press control + d in the terminal session where the service was started in (6)

eclipse

• follow the following steps to import the downloaded backend service in eclipse

1. cd to the service's directory and execute the ./_eclipsify.sh script
2. file > import > general > existing projects into workspace > next > set "select root directory" to my_services > under projects make sure that vos_calculate_sum is selected > finish
3. double check the java version used for compiling the project: right click the project > properties > java compiler > enable project specific settings > compiler compliance level > 1.7 or 1.8

covered topics

• generating a simple service

features

controller	feature
calculate sum	adds up two floating point numbers

service references

reference	explanation
routes	api routes
controllers.json	api request/response's elements
controllers	api implementation

change log

• this section lists the 10-% code added after vangav backend generated 90+% of the code

file/dir	change
controllers	added the implementation of request-to-response logic in processRequest methods under controller_name/HandlerControllerName.java classes

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