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August 29, 2015 14:23
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Long Polling
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| @startuml | |
| hide footbox | |
| Client -> Server: HTTP Get << Long Lived>> | |
| activate Client | |
| activate Server | |
| Server -> Server: serve() | |
| activate Server | |
| Server -> BlockingQueue: poll(timeout, timeUnit) | |
| activate BlockingQueue | |
| BlockingQueue -> BlockingQueue: << Timeout >> | |
| activate BlockingQueue | |
| BlockingQueue --> Server: null | |
| deactivate BlockingQueue | |
| deactivate BlockingQueue | |
| deactivate Server | |
| Server --> Client: 408 Request Timeout | |
| deactivate Server | |
| Client -> Server: HTTP Get << Long Lived>> | |
| activate Server | |
| Server -> Server: serve() | |
| activate Server | |
| Server -> BlockingQueue: poll(timeout, timeUnit) | |
| activate BlockingQueue | |
| EventManager -> BlockingQueue: put(event) | |
| activate BlockingQueue | |
| BlockingQueue --> EventManager | |
| deactivate BlockingQueue | |
| BlockingQueue --> Server: return event | |
| deactivate BlockingQueue | |
| deactivate Server | |
| Server --> Client: 200 OK event | |
| deactivate Server | |
| deactivate Client | |
| @enduml |
After timeout, no exception are thrown, Poll returns null
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According to https://tools.ietf.org/html/rfc6202#section-5.5, the timeout should return a 408