shaohuahuang / java_distributed Goto Github PK

Every 0.5s, the user Gossip push out the TrackerState. If the recipient has a lower version, update the TrackerState, otherwise remains unchanged.

• First backup need to start the scheduler
• New backup also need to start the scheduler

• player mark itself as backup

• tracker register the player in the list

• player sync with primary server, build communication with primary

• Primary sync the Game State to backup.

Every 0.5s, the user should randomly gossip pull the state from other players. If the game version of other players is large, the use that state. Otherwise, remains unchanged.

Note: The reason we need it is because we want a player to get real-time update even though it is not making move request.

• joins the game
• gossip others to get the game state
• sync TrackerState to primary server ----> sync to primary server
• make a move and all three are updated

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• receive N and K from Tracker
• render the grid and treasury
• generate location of treasury
• mark itself as primary

• Start joining Tracker only when all service starts

player list [id, IP, port]
N is maze size
K is treasury number

• primary should check heart beat of backup
• Gossip does not report whether server crash
• when promote as primary, need to spin the scheduler
• sync game state fail, will not find new backup server

• 3rd player gracefully exits
• 4th player gracefully exits

1. Sync the updated GameState from primary server and backup server.
2. Checking the heartbeat mutually (This is to prevent both servers from dying)

GUI:
[ ] name of the local player [top of the window]

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Every time the player makes a move request, it will update primary server game state and get the updated game state as response.