Duplicate app instances cause inconsistency in data storage

[nus-pe-bot]

Environment: MacOS Ventura 13.2.1, Apple M1, Java 11 Zulu

Description: When two instances of GoodMatch are open at the same time, it is possible to have inconsistencies in the data.

How to reproduce:

• Open the jar file via java -jar. Let us refer to the instance of GoodMatch that is opened by this command as GM1.
• Open the jar file again via java -jar. Let us refer to the instance of GoodMatch that is opened by this command as GM2.
• In GM1, enter the command add t/McDonalds Cashier d/Count money.
• In GM2, enter the command add t/KFC Cashier d/Count money.
• In both GM1 and GM2, enter the command view to try to obtain the list of all job listings.

Expected behavior: Both instances GM1 and GM2 should contain the two newly added job listings titled KFC Cashier and McDonalds Cashier.

Observed behavior: Both instances only contain either one of McDonalds Cashier or KFC Cashier, but not both. After closing both instances and reopening them, only KFC Cashier remains (see the screenshot for GM2)

Shown above: GM1

Shown above: GM2

Remarks: This scenario may be unlikely to happen, but it is still possible for a user to accidentally open two instances of the same app when they are unaware that another instance is already running. This data loss may not be a big issue if the user realises early, but if the user only realises it after adding a lot of data to only one instance, quite a lot of data may be lost.

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_{[original: nus-cs2103-AY2223S2/pe-interim#3003] [original labels: type.FunctionalityBug severity.Medium]}

[panpannnnn]

Team's Response

Our app is not made to be ran in parallel

Duplicate status (if any):

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