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orange — Client side concurrency made simple
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rubysauna.org
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heartrate.js
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Concurrency
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A B C
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A B C
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A B C
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Concurrency is hard
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A B C
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Concurrency
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Barber z z
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Barber Customer z z Sleeping?
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Barber Customer
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Barber Customer Working?
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Barber Customer
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Barber
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Barber Customer
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Barber
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Barber Customer ?
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Barber Customer Crap.
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Barber
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Barber Customer
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Barber z z Crap.
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Concurrency in the browser
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JavaScript and the golden thread
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foo() 10ms 20ms 30ms 40ms click handled click fired setInterval (10ms)
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Synchronous —vs— Asynchronous
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WebWorkers
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JavaScript Thread Worker
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Worker JavaScript Thread
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Worker Worker JavaScript Thread
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Dedicated, Shared & Inline Workers
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orange
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The queue
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Define a worker
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# workers/sum.coffee importScripts 'orange/worker.js' perform (data)-> data.numbers.reduce (a, b)-> a + b
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# workers/sum.coffee importScripts 'orange/worker.js' perform (data)-> data.numbers.reduce (a, b)-> a + b
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Create a new job
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job = new Orange.Job('sum', numbers: [1..100])
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job = new Orange.Job('sum', numbers: [1..100]) job.on 'success', (response) -> console.log('Sum', response) job.perform()
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Events
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job.on 'success', (response)-> job.on 'complete', -> job.on 'error', (error)-> job.on 'failure', (error)->
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Logging
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# workers/sum.coffee importScripts 'orange/worker.js' perform (data)-> log 'The background worker Gotham deserves ...' data.numbers.reduce (a, b) ->a + b
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Batches
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batch = new Orange.Batch
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batch = new Orange.Batch job = new Orange.Job('sum', [1..100]) batch.push job batch.perform()
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batch = new Orange.Batch [job1, job2, job3]
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batch.on 'complete', (jobs) -> batch.on 'job:success', (job) -> batch.on 'job:complete', (job)-> batch.on 'job:error', (job) -> batch.on 'job:failure', (job) ->
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job.getResponse() job.getLastError()
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Configuration
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Orange.Config.set maxWorkerPoolSize: 4 maxRetries : 3 workersPath : '/lib/workers/'
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Retry mechanism and exponential back–off
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Error handling
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job.on 'error', (error)-> throw error BatchStateTransitionError JobStateTransitionError ResponderNotFoundError …
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Roadmap >0.2.0
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Customized Worker Shim Test coverage Data serialization Benchmarking
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Forward arbitrary method calls to worker? Custom events? Instrumentation? Inline Workers? Helper modules?
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Kiitos!
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@polarblau