Y::Notifier - Specification - Routing of messages

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• Aside
• Local client-server connections are AF_UNIX (TCP) by default
• Server-server connections are AF_INET (TCP)
• What is allowed - very important
• Clients only subscribe to subjects with their local server
• Servers, on behalf of their clients, subscribe to those subjects with the other servers
• Servers do not subscribe on behalf of other servers
• Servers route messages from
• client to client - target client is on the same host
• client to server - target client is on destination server's host
• server to client - target client is on localhost
• Servers do not route messages from server to server
• Therefore
• Messages make 2 hops minimum (client - server - client)
• Messages make 3 hops maximum (client - server - server - client)

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Y::Notifier - Specification - Routing of messages