1/ How do we design a ππ‘ππ ππ©π©π₯π’ππππ’π¨π§ like WhatsApp, Facebook Messenger or Discord?
The diagram below shows a design for a simplified 1 to 1 chat application.
The diagram below shows a design for a simplified 1 to 1 chat application.
2/ ππ¬ππ« ππ¨π π’π§ π
π₯π¨π°
πΉStep 1: Alice logs in to the chat application and establishes a web socket connection with the server side.
πΉSteps 2-4: The presence service receives Alice's notification, updates her presence, and notifies Alice's friends about her presence.
πΉStep 1: Alice logs in to the chat application and establishes a web socket connection with the server side.
πΉSteps 2-4: The presence service receives Alice's notification, updates her presence, and notifies Alice's friends about her presence.
3/ πππ¬π¬ππ π’π§π π
π₯π¨π°
πΉSteps 1-2: Alice sends a chat message to Bob. The chat message is routed to Chat Service A.
πΉSteps 3-4: The chat message is sent to the sequencing service which generates a unique ID, and is persisted in the message store.
πΉSteps 1-2: Alice sends a chat message to Bob. The chat message is routed to Chat Service A.
πΉSteps 3-4: The chat message is sent to the sequencing service which generates a unique ID, and is persisted in the message store.
4/ πΉStep 5: The chat message is sent to the message sync queue to sync to Bobβs chat service.
5/ πΉStep 6: Before forwarding the messaging, the message sync service checks Bobβs presence:
a) If Bob is online, the chat message is sent to chat service B.
b) If Bob is offline, the message is sent to the push server and gets pushed to Bobβs device.
a) If Bob is online, the chat message is sent to chat service B.
b) If Bob is offline, the message is sent to the push server and gets pushed to Bobβs device.
6/ πΉSteps 7-8: If Bob is online, the chat message is pushed to Bob via the web socket.
7/ π Over to you: How to sync the chat messages among Aliceβs different devices?
8/ I hope you've found this thread helpful.
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