Digital_Library/sequenceDiagram.puml at dev · harishun/Digital_Library · GitHub

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@startuml sequenceDiagram
actor Member
participant "DigitalLibrary" as DL
participant "m : Member" as M
participant "b : Book" as B
participant "newTxn : Transaction" as T

Member -> DL: Choose "Borrow Book" (Choice 3)
activate DL

DL -> M: borrowBook(books)
activate M

M -> M: check balance > 0
alt balance > 0
    M --> DL: Print block message (clear fines)
else balance == 0
    M -> M: check active borrows count
    alt active borrows >= 3
        M --> DL: Print borrow limit reached
    else active borrows < 3
        M --> Member: Prompt for ISBN
        Member -> M: Input ISBN

        M -> M: Find book in books list
        activate B
        M -> B: getISBN()
        B --> M: ISBN
        M -> B: isAvailable()
        B --> M: isAvailable (true)

        alt Book is available
            M -> M: Generate unique Transaction ID
            create T
            M -> T: new Transaction(transactionId, member, book)
            M -> T: borrowBook()
            activate T
            T -> B: borrowed()
            B --> T
            deactivate B
            T --> M
            deactivate T

            M -> DL: Add transaction to transactions list
            M --> Member: Print success and due date
        else Book unavailable
            M --> Member: Print unavailable message
        end
    end
end

deactivate M
deactivate DL
@enduml