weather
An attempt at simplifying https://gist.github.com/kachayev/21e7fe149bc5ae0bd878
In this example, we implement weather.FindAll(cities) to find the weather in the specified cities:
- calls are made in parallel
- weather for each city is queried twice to reduce overall latency
- #FindAll returns once we have weather for each city
- upon completion, any outstanding calls are actively canceled
It would be interesting to see the corresponding implementation in another language.
Running the Test
Executes the test and instructs the application to log all messages so you can see what it's doing internally.
export DEBUG='*'
go test -run=TestLive
Sample Test Run
$ go test -run=TestLive
06:30:26.944 377us 377us weather - GetWeather(San Francisco)
06:30:26.944 24us 24us weather - GetWeather(San Francisco)
06:30:26.944 6us 6us weather - GetWeather(Oakland)
06:30:26.944 5us 5us weather - GetWeather(Oakland)
06:30:26.944 5us 5us weather - GetWeather(Detroit)
06:30:26.944 5us 5us weather - GetWeather(Detroit)
06:30:26.944 5us 5us weather - GetWeather(London)
06:30:26.944 5us 5us weather - GetWeather(London)
06:30:27.122 178ms 178ms openweathermap - http - ok
06:30:27.122 178ms 178ms weather - received weather => San Francisco
06:30:27.122 9us 9us weather - weather reports received => 1
06:30:27.127 4ms 4ms openweathermap - http - ok
06:30:27.127 4ms 4ms weather - received weather => Detroit
06:30:27.127 5us 5us weather - weather reports received => 2
06:30:27.128 1ms 1ms openweathermap - http - ok
06:30:27.128 1ms 1ms weather - received weather => London
06:30:27.128 3us 3us weather - weather reports received => 3
06:30:27.128 72us 72us openweathermap - http - ok
06:30:27.128 68us 68us weather - received weather => San Francisco
06:30:27.128 2us 2us weather - weather reports received => 3
06:30:27.130 1ms 1ms openweathermap - http - ok
06:30:27.130 1ms 1ms weather - received weather => Oakland
06:30:27.130 3us 3us weather - weather reports received => 4
06:30:27.130 4us 4us weather - finished
map[San Francisco:0xc20801a730 Detroit:0xc20801a910 London:0xc20801aaf0 Oakland:0xc20801a7d0]
06:30:27.130 46us 46us openweathermap - http - CancelRequest
06:30:27.130 3us 3us openweathermap - http - CancelRequest
06:30:27.130 2us 2us openweathermap - http - CancelRequest
PASS
ok github.com/savaki/weather 0.195s
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