Существуют следующие гарантии доставки:
▪️ At most once —
▪️ At least once —
▪️ Exactly once —
Каждая из этих гарантий используется в зависимости от требований к надежности и производительности системы.
BY Библиотека собеса по Java | вопросы с собеседований
Telegram is a free app and runs on donations. According to a blog on the telegram: We believe in fast and secure messaging that is also 100% free. Pavel Durov, who shares our vision, supplied Telegram with a generous donation, so we have quite enough money for the time being. If Telegram runs out, we will introduce non-essential paid options to support the infrastructure and finance developer salaries. But making profits will never be an end-goal for Telegram.
The messaging service and social-media platform owes creditors roughly $700 million by the end of April, according to people briefed on the company’s plans and loan documents viewed by The Wall Street Journal. At the same time, Telegram Group Inc. must cover rising equipment and bandwidth expenses because of its rapid growth, despite going years without attempting to generate revenue.
Библиотека собеса по Java | вопросы с собеседований from kr