John Smith [ARCHIVE] on Nostr: 📅 Original date posted:2011-07-14 🗒️ Summary of this message: Proposal to use ...

📅 Original date posted:2011-07-14
🗒️ Summary of this message: Proposal to use boost::signal mechanism to add notifications to decouple UI and core communication in the client and wallet. Specific notifications listed.
📝 Original message:Hello all,

I'd like to add notifications to the client and wallet, to decouple UI and
core communication, and especially so that UIs no longer have to poll for
changes.

I propose to use the boost::signal mechanism for that. It is basically a
glorified callback system, but allows decoupled delivery of 'signals' from
an object. Multiple other objects can listen in on an event without the
emitting object having to care.

Wallet:

class CWallet { ...
boost::signal<void(int64)> balanceChanged;
}

void CWallet::newTx (...) {
...
balanceChanged(new_balance);
...
}


UI:

GUI::GUI(CWallet *wallet) {
...
wallet->balanceChanged.connect(boost::bind(&GUI::balanceChanged, this,
_1));
}
GUI::balanceChanged(int64 new_balance) {
someWidget->setValue(new_balance);
}

Specific notifications that would be useful:

Wallet:

- balanceChanged(int64): spendable balance changed
- transactionAdded(int256): new transaction added to wallet
- transactionUpdated(int256): transaction info changed
- transactionRemoved(int256): transaction removed from wallet (can this
happen? for completeness)
- addressAdded(int160): address was added to address book
- addressUpdated(int160): address label/other metadata was modified
- addressRemoved(int160): address was removed from address book
- notification(std::string message, int severity): warning/error occured
in wallet processing, notify user
- int askFee(std::string message, ...): ask user for fee

Network client:

- numConnectionsChanged(int): new connections / connections broken
- numBlocksChanged(int): new blocks came in or other changes to block
chain
- notification(std::string message, int severity): warning/error occured
in network processing, notify user


JS
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