Queue Processors

Queue - Solace - Publish / Subscribe

Publish / Subscribe

publish subscribe - that is similar to a newspaper. The sender is sending out messages. People who subscribe will receive the messages.

Sample
open instance of WSL

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stm config init
stm manage connection --url ws://localhost:8008 --vpn default --username default --password default
stm manage semp-connection --semp-url http://localhost:8080/SEMP/v2/config --semp-vpn default --semp-username admin --semp-password admin
stm receive --topic "coffeeshop/order/details/v1/*/ca/>" --client-name "Barista Station" --output-mode full
  • Creates a client endpoint for a ‘Barista Station’
  • This endpoint will be reading from a queue called “coffeeshop/order/details/v1/*/ca/>”
  • coffeeshop/order/details/v1/*/ca/> - is a 6 (or more) hierarchical definition
    • Actually /*/ is a wildcard saying it will receive all messages directed to any variation in that queue …/v1/x/ca/… and …/v1/y/ca/… and …/v1/marysville/ca/…
    • /> is a whilecard meaning
  • The stm program is now waiting to receive messages
    • –output-mode full ???

Open a second terminal window

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stm receive --topic "coffeeshop/order/details/v1/*/ca/>" --client-name "Kitchen Floor"
  • Creates a second client endpoint for a computer in the ‘Kitchen Floor’ area.
  • This is receiving the same messages as the barista station is receiving.
  • The stm program is now waiting to receive messages

Open a third terminal window

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stm receive --topic "coffeeshop/staff/arrive/v2/*/ca/>" --client-name "Human Resources"
  • Creates a third client endpoint for a computer in the ‘Human Resources’ area
  • Notice – this points to a different queue. So it wont receive the same messages as the other 2 receivers.

Open a forth terminal window

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stm send --topic coffeeshop/order/details/v1/mobile/ca/437/44334 --file order.json --client-name "Order Management"
  • This will send a message to the queue system.
  • –topic coffeeshop/order/details/v1/mobile/ca/437/44334
    • This is the name of the queue to post the message into
  • I don’t think you are allowed to use wildcards in this case.
  • –file order.json
    • We are going to send a json file. With the name provided below.
  • –client-name “Order Management”
    • This is the name of the process sending out the message.
  • Send - this is sending messages, it will load, send a message and then exit.