公开(公告)号：US20210185002A1

公开(公告)日：2021-06-17

申请号：US17187866

申请日：2021-02-28

Applicant: Google LLC

Inventor： Yi Cui ,  Subir Jhanb ,  Thomas R. Kennedy

IPC: H04L12/58

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for a watermark-based message queue. One of the methods includes receiving a first connection request for messages associated with a user device. A first connection session is established with the user device. A message queue of messages associated with the user device is identified, each message in the message queue is associated with a respective timestamp, and the message queue is associated with a current watermark that identifies a first timestamp. An oldest message in the message queue at the time the first connection session was established is identified. An updated watermark that identifies a second timestamp associated with the oldest message is associated with the message queue. One or more messages that have a timestamp newer than or equal to the first timestamp identified by the current watermark is provided to the user device.