delete method
Implementation
Future<void> delete(ExpiringAddr a) async {
await _lock.synchronized(() async {
final peerKey = a.peer.toString();
final addrKey = a.addr.toString();
if (_addrs.containsKey(peerKey) &&
_addrs[peerKey]!.containsKey(addrKey)) {
final ea = _addrs[peerKey]![addrKey]!;
if (ea.heapIndex != -1) {
remove(ea.heapIndex);
}
_addrs[peerKey]!.remove(addrKey);
if (_addrs[peerKey]!.isEmpty) {
_addrs.remove(peerKey);
}
}
});
}