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!str #19037 rename FlowGraph to GraphDSL

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This commit is contained in:
Roland Kuhn 2015-11-30 15:45:37 +01:00
parent 5895834d98
commit f00da4daac
92 changed files with 535 additions and 542 deletions
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20
akka-docs-dev/rst/scala/code/docs/MigrationsScala.scala
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@ -51,14 +51,14 @@ class MigrationsScala extends AkkaSpec {
//#bidiflow-wrap
//#graph-create
// Replaces FlowGraph.closed()
FlowGraph.create() { builder =>
// Replaces GraphDSL.closed()
GraphDSL.create() { builder =>
//...
ClosedShape
}
// Replaces FlowGraph.partial()
FlowGraph.create() { builder =>
// Replaces GraphDSL.partial()
GraphDSL.create() { builder =>
//...
FlowShape(inlet, outlet)
}
@ -66,25 +66,25 @@ class MigrationsScala extends AkkaSpec {
//#graph-create-2
Source.fromGraph(
FlowGraph.create() { builder =>
GraphDSL.create() { builder =>
//...
SourceShape(outlet)
})
Sink.fromGraph(
FlowGraph.create() { builder =>
GraphDSL.create() { builder =>
//...
SinkShape(inlet)
})
Flow.fromGraph(
FlowGraph.create() { builder =>
GraphDSL.create() { builder =>
//...
FlowShape(inlet, outlet)
})
BidiFlow.fromGraph(
FlowGraph.create() { builder =>
GraphDSL.create() { builder =>
//...
BidiShape(inlet1, outlet1, inlet2, outlet2)
})
@ -92,8 +92,8 @@ class MigrationsScala extends AkkaSpec {
//#graph-edges
RunnableGraph.fromGraph(
FlowGraph.create() { implicit builder =>
import FlowGraph.Implicits._
GraphDSL.create() { implicit builder =>
import GraphDSL.Implicits._
outlet ~> inlet
outlet ~> flow ~> inlet
//...

8
akka-docs-dev/rst/scala/code/docs/stream/BidiFlowDocSpec.scala
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@ -44,7 +44,7 @@ object BidiFlowDocSpec {
}
//#codec-impl
val codecVerbose = BidiFlow.fromGraph(FlowGraph.create() { b =>
val codecVerbose = BidiFlow.fromGraph(GraphDSL.create() { b =>
// construct and add the top flow, going outbound
val outbound = b.add(Flow[Message].map(toBytes))
// construct and add the bottom flow, going inbound
@ -58,7 +58,7 @@ object BidiFlowDocSpec {
//#codec
//#framing
val framing = BidiFlow.fromGraph(FlowGraph.create() { b =>
val framing = BidiFlow.fromGraph(GraphDSL.create() { b =>
implicit val order = ByteOrder.LITTLE_ENDIAN
def addLengthHeader(bytes: ByteString) = {
@ -116,12 +116,12 @@ object BidiFlowDocSpec {
})
//#framing
val chopUp = BidiFlow.fromGraph(FlowGraph.create() { b =>
val chopUp = BidiFlow.fromGraph(GraphDSL.create() { b =>
val f = Flow[ByteString].mapConcat(_.map(ByteString(_)))
BidiShape.fromFlows(b.add(f), b.add(f))
})
val accumulate = BidiFlow.fromGraph(FlowGraph.create() { b =>
val accumulate = BidiFlow.fromGraph(GraphDSL.create() { b =>
val f = Flow[ByteString].grouped(1000).map(_.fold(ByteString.empty)(_ ++ _))
BidiShape.fromFlows(b.add(f), b.add(f))
})

16
akka-docs-dev/rst/scala/code/docs/stream/CompositionDocSpec.scala
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@ -76,8 +76,8 @@ class CompositionDocSpec extends AkkaSpec {
"complex graph" in {
// format: OFF
//#complex-graph
import FlowGraph.Implicits._
RunnableGraph.fromGraph(FlowGraph.create() { implicit builder =>
import GraphDSL.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit builder =>
val A: Outlet[Int] = builder.add(Source.single(0)).outlet
val B: UniformFanOutShape[Int, Int] = builder.add(Broadcast[Int](2))
val C: UniformFanInShape[Int, Int] = builder.add(Merge[Int](2))
@ -96,8 +96,8 @@ class CompositionDocSpec extends AkkaSpec {
//#complex-graph
//#complex-graph-alt
import FlowGraph.Implicits._
RunnableGraph.fromGraph(FlowGraph.create() { implicit builder =>
import GraphDSL.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit builder =>
val B = builder.add(Broadcast[Int](2))
val C = builder.add(Merge[Int](2))
val E = builder.add(Balance[Int](2))
@ -117,8 +117,8 @@ class CompositionDocSpec extends AkkaSpec {
"partial graph" in {
// format: OFF
//#partial-graph
import FlowGraph.Implicits._
val partial = FlowGraph.create() { implicit builder =>
import GraphDSL.Implicits._
val partial = GraphDSL.create() { implicit builder =>
val B = builder.add(Broadcast[Int](2))
val C = builder.add(Merge[Int](2))
val E = builder.add(Balance[Int](2))
@ -143,7 +143,7 @@ class CompositionDocSpec extends AkkaSpec {
val flow = Flow.fromGraph(partial)
// Simple way to create a graph backed Source
val source = Source.fromGraph( FlowGraph.create() { implicit builder =>
val source = Source.fromGraph( GraphDSL.create() { implicit builder =>
val merge = builder.add(Merge[Int](2))
Source.single(0) ~> merge
Source(List(2, 3, 4)) ~> merge
@ -167,7 +167,7 @@ class CompositionDocSpec extends AkkaSpec {
"closed graph" in {
//#embed-closed
val closed1 = Source.single(0).to(Sink.foreach(println))
val closed2 = RunnableGraph.fromGraph(FlowGraph.create() { implicit builder =>
val closed2 = RunnableGraph.fromGraph(GraphDSL.create() { implicit builder =>
val embeddedClosed: ClosedShape = builder.add(closed1)
// …
embeddedClosed

8
akka-docs-dev/rst/scala/code/docs/stream/FlowDocSpec.scala
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@ -148,9 +148,9 @@ class FlowDocSpec extends AkkaSpec {
"various ways of transforming materialized values" in {
import scala.concurrent.duration._
val throttler = Flow.fromGraph(FlowGraph.create(Source.tick(1.second, 1.second, "test")) { implicit builder =>
val throttler = Flow.fromGraph(GraphDSL.create(Source.tick(1.second, 1.second, "test")) { implicit builder =>
tickSource =>
import FlowGraph.Implicits._
import GraphDSL.Implicits._
val zip = builder.add(ZipWith[String, Int, Int](Keep.right))
tickSource ~> zip.in0
FlowShape(zip.in1, zip.out)
@ -211,9 +211,9 @@ class FlowDocSpec extends AkkaSpec {
// The result of r11 can be also achieved by using the Graph API
val r12: RunnableGraph[(Promise[Option[Int]], Cancellable, Future[Int])] =
RunnableGraph.fromGraph(FlowGraph.create(source, flow, sink)((_, _, _)) { implicit builder =>
RunnableGraph.fromGraph(GraphDSL.create(source, flow, sink)((_, _, _)) { implicit builder =>
(src, f, dst) =>
import FlowGraph.Implicits._
import GraphDSL.Implicits._
src ~> f ~> dst
ClosedShape
})

28
akka-docs-dev/rst/scala/code/docs/stream/FlowGraphDocSpec.scala
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@ -21,8 +21,8 @@ class FlowGraphDocSpec extends AkkaSpec {
"build simple graph" in {
//format: OFF
//#simple-flow-graph
val g = RunnableGraph.fromGraph(FlowGraph.create() { implicit builder: FlowGraph.Builder[Unit] =>
import FlowGraph.Implicits._
val g = RunnableGraph.fromGraph(GraphDSL.create() { implicit builder: GraphDSL.Builder[Unit] =>
import GraphDSL.Implicits._
val in = Source(1 to 10)
val out = Sink.ignore
@ -46,8 +46,8 @@ class FlowGraphDocSpec extends AkkaSpec {
"flow connection errors" in {
intercept[IllegalArgumentException] {
//#simple-graph
RunnableGraph.fromGraph(FlowGraph.create() { implicit builder =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit builder =>
import GraphDSL.Implicits._
val source1 = Source(1 to 10)
val source2 = Source(1 to 10)
@ -74,9 +74,9 @@ class FlowGraphDocSpec extends AkkaSpec {
// format: OFF
val g =
//#flow-graph-reusing-a-flow
RunnableGraph.fromGraph(FlowGraph.create(topHeadSink, bottomHeadSink)((_, _)) { implicit builder =>
RunnableGraph.fromGraph(GraphDSL.create(topHeadSink, bottomHeadSink)((_, _)) { implicit builder =>
(topHS, bottomHS) =>
import FlowGraph.Implicits._
import GraphDSL.Implicits._
val broadcast = builder.add(Broadcast[Int](2))
Source.single(1) ~> broadcast.in
@ -133,8 +133,8 @@ class FlowGraphDocSpec extends AkkaSpec {
worker: Flow[In, Out, Any],
workerCount: Int): Graph[PriorityWorkerPoolShape[In, Out], Unit] = {
FlowGraph.create() { implicit b ⇒
import FlowGraph.Implicits._
GraphDSL.create() { implicit b ⇒
import GraphDSL.Implicits._
val priorityMerge = b.add(MergePreferred[In](1))
val balance = b.add(Balance[In](workerCount))
@ -168,8 +168,8 @@ class FlowGraphDocSpec extends AkkaSpec {
val worker1 = Flow[String].map("step 1 " + _)
val worker2 = Flow[String].map("step 2 " + _)
RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val priorityPool1 = b.add(PriorityWorkerPool(worker1, 4))
val priorityPool2 = b.add(PriorityWorkerPool(worker2, 2))
@ -203,8 +203,8 @@ class FlowGraphDocSpec extends AkkaSpec {
"access to materialized value" in {
//#flow-graph-matvalue
import FlowGraph.Implicits._
val foldFlow: Flow[Int, Int, Future[Int]] = Flow.fromGraph(FlowGraph.create(Sink.fold[Int, Int](0)(_ + _)) {
import GraphDSL.Implicits._
val foldFlow: Flow[Int, Int, Future[Int]] = Flow.fromGraph(GraphDSL.create(Sink.fold[Int, Int](0)(_ + _)) {
implicit builder ⇒
fold ⇒
FlowShape(fold.inlet, builder.materializedValue.mapAsync(4)(identity).outlet)
@ -214,9 +214,9 @@ class FlowGraphDocSpec extends AkkaSpec {
Await.result(Source(1 to 10).via(foldFlow).runWith(Sink.head), 3.seconds) should ===(55)
//#flow-graph-matvalue-cycle
import FlowGraph.Implicits._
import GraphDSL.Implicits._
// This cannot produce any value:
val cyclicFold: Source[Int, Future[Int]] = Source.fromGraph(FlowGraph.create(Sink.fold[Int, Int](0)(_ + _)) {
val cyclicFold: Source[Int, Future[Int]] = Source.fromGraph(GraphDSL.create(Sink.fold[Int, Int](0)(_ + _)) {
implicit builder =>
fold =>
// - Fold cannot complete until its upstream mapAsync completes

12
akka-docs-dev/rst/scala/code/docs/stream/FlowParallelismDocSpec.scala
View file

@ -1,12 +1,12 @@
package docs.stream
import akka.stream.FlowShape
import akka.stream.scaladsl.{ FlowGraph, Merge, Balance, Source, Flow }
import akka.stream.scaladsl.{ GraphDSL, Merge, Balance, Source, Flow }
import akka.stream.testkit.AkkaSpec
class FlowParallelismDocSpec extends AkkaSpec {
import FlowGraph.Implicits._
import GraphDSL.Implicits._
case class ScoopOfBatter()
case class HalfCookedPancake()
@ -38,7 +38,7 @@ class FlowParallelismDocSpec extends AkkaSpec {
val fryingPan: Flow[ScoopOfBatter, Pancake, Unit] =
Flow[ScoopOfBatter].map { batter => Pancake() }
val pancakeChef: Flow[ScoopOfBatter, Pancake, Unit] = Flow.fromGraph(FlowGraph.create() { implicit builder =>
val pancakeChef: Flow[ScoopOfBatter, Pancake, Unit] = Flow.fromGraph(GraphDSL.create() { implicit builder =>
val dispatchBatter = builder.add(Balance[ScoopOfBatter](2))
val mergePancakes = builder.add(Merge[Pancake](2))
@ -59,7 +59,7 @@ class FlowParallelismDocSpec extends AkkaSpec {
"Demonstrate parallelized pipelines" in {
//#parallel-pipeline
val pancakeChef: Flow[ScoopOfBatter, Pancake, Unit] =
Flow.fromGraph(FlowGraph.create() { implicit builder =>
Flow.fromGraph(GraphDSL.create() { implicit builder =>
val dispatchBatter = builder.add(Balance[ScoopOfBatter](2))
val mergePancakes = builder.add(Merge[Pancake](2))
@ -77,7 +77,7 @@ class FlowParallelismDocSpec extends AkkaSpec {
"Demonstrate pipelined parallel processing" in {
//#pipelined-parallel
val pancakeChefs1: Flow[ScoopOfBatter, HalfCookedPancake, Unit] =
Flow.fromGraph(FlowGraph.create() { implicit builder =>
Flow.fromGraph(GraphDSL.create() { implicit builder =>
val dispatchBatter = builder.add(Balance[ScoopOfBatter](2))
val mergeHalfPancakes = builder.add(Merge[HalfCookedPancake](2))
@ -90,7 +90,7 @@ class FlowParallelismDocSpec extends AkkaSpec {
})
val pancakeChefs2: Flow[HalfCookedPancake, Pancake, Unit] =
Flow.fromGraph(FlowGraph.create() { implicit builder =>
Flow.fromGraph(GraphDSL.create() { implicit builder =>
val dispatchHalfPancakes = builder.add(Balance[HalfCookedPancake](2))
val mergePancakes = builder.add(Merge[Pancake](2))

20
akka-docs-dev/rst/scala/code/docs/stream/GraphCyclesSpec.scala
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@ -16,8 +16,8 @@ class GraphCyclesSpec extends AkkaSpec {
// format: OFF
//#deadlocked
// WARNING! The graph below deadlocks!
RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val merge = b.add(Merge[Int](2))
val bcast = b.add(Broadcast[Int](2))
@ -34,8 +34,8 @@ class GraphCyclesSpec extends AkkaSpec {
// format: OFF
//#unfair
// WARNING! The graph below stops consuming from "source" after a few steps
RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val merge = b.add(MergePreferred[Int](1))
val bcast = b.add(Broadcast[Int](2))
@ -51,8 +51,8 @@ class GraphCyclesSpec extends AkkaSpec {
"include a dropping cycle" in {
// format: OFF
//#dropping
RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val merge = b.add(Merge[Int](2))
val bcast = b.add(Broadcast[Int](2))
@ -69,8 +69,8 @@ class GraphCyclesSpec extends AkkaSpec {
// format: OFF
//#zipping-dead
// WARNING! The graph below never processes any elements
RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val zip = b.add(ZipWith[Int, Int, Int]((left, right) => right))
val bcast = b.add(Broadcast[Int](2))
@ -87,8 +87,8 @@ class GraphCyclesSpec extends AkkaSpec {
"include a live zipping cycle" in {
// format: OFF
//#zipping-live
RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val zip = b.add(ZipWith((left: Int, right: Int) => left))
val bcast = b.add(Broadcast[Int](2))

2
akka-docs-dev/rst/scala/code/docs/stream/GraphStageDocSpec.scala
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@ -66,7 +66,7 @@ class GraphStageDocSpec extends AkkaSpec {
//#custom-source-example
//#simple-source-usage
// A GraphStage is a proper Graph, just like what FlowGraph.create would return
// A GraphStage is a proper Graph, just like what GraphDSL.create would return
val sourceGraph: Graph[SourceShape[Int], Unit] = new NumbersSource
// Create a Source from the Graph to access the DSL

4
akka-docs-dev/rst/scala/code/docs/stream/StreamBuffersRateSpec.scala
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@ -39,8 +39,8 @@ class StreamBuffersRateSpec extends AkkaSpec {
import scala.concurrent.duration._
case class Tick()
RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val zipper = b.add(ZipWith[Tick, Int, Int]((tick, count) => count))

16
akka-docs-dev/rst/scala/code/docs/stream/StreamPartialFlowGraphDocSpec.scala
View file

@ -19,8 +19,8 @@ class StreamPartialFlowGraphDocSpec extends AkkaSpec {
"build with open ports" in {
//#simple-partial-flow-graph
val pickMaxOfThree = FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
val pickMaxOfThree = GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val zip1 = b.add(ZipWith[Int, Int, Int](math.max _))
val zip2 = b.add(ZipWith[Int, Int, Int](math.max _))
@ -31,9 +31,9 @@ class StreamPartialFlowGraphDocSpec extends AkkaSpec {
val resultSink = Sink.head[Int]
val g = RunnableGraph.fromGraph(FlowGraph.create(resultSink) { implicit b =>
val g = RunnableGraph.fromGraph(GraphDSL.create(resultSink) { implicit b =>
sink =>
import FlowGraph.Implicits._
import GraphDSL.Implicits._
// importing the partial graph will return its shape (inlets & outlets)
val pm3 = b.add(pickMaxOfThree)
@ -52,8 +52,8 @@ class StreamPartialFlowGraphDocSpec extends AkkaSpec {
"build source from partial flow graph" in {
//#source-from-partial-flow-graph
val pairs = Source.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
val pairs = Source.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
// prepare graph elements
val zip = b.add(Zip[Int, Int]())
@ -75,8 +75,8 @@ class StreamPartialFlowGraphDocSpec extends AkkaSpec {
"build flow from partial flow graph" in {
//#flow-from-partial-flow-graph
val pairUpWithToString =
Flow.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
Flow.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
// prepare graph elements
val broadcast = b.add(Broadcast[Int](2))

4
akka-docs-dev/rst/scala/code/docs/stream/TwitterStreamQuickstartDocSpec.scala
View file

@ -118,8 +118,8 @@ class TwitterStreamQuickstartDocSpec extends AkkaSpec {
// format: OFF
//#flow-graph-broadcast
val g = RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
val g = RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val bcast = b.add(Broadcast[Tweet](2))
tweets ~> bcast.in

2
akka-docs-dev/rst/scala/code/docs/stream/cookbook/RecipeCollectingMetrics.scala
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@ -27,7 +27,7 @@ class RecipeCollectingMetrics extends RecipeSpec {
// //#periodic-metrics-collection
// val currentLoad = loadUpdates.transform(() => new HoldWithWait)
//
// val graph = FlowGraph { implicit builder =>
// val graph = GraphDSL { implicit builder =>
// import FlowGraphImplicits._
// val collector = ZipWith[Int, Tick, String](
// (load: Int, tick: Tick) => s"current load is $load")

4
akka-docs-dev/rst/scala/code/docs/stream/cookbook/RecipeDroppyBroadcast.scala
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@ -24,9 +24,9 @@ class RecipeDroppyBroadcast extends RecipeSpec {
val mySink3 = Sink(sub3)
//#droppy-bcast
val graph = RunnableGraph.fromGraph(FlowGraph.create(mySink1, mySink2, mySink3)((_, _, _)) { implicit b =>
val graph = RunnableGraph.fromGraph(GraphDSL.create(mySink1, mySink2, mySink3)((_, _, _)) { implicit b =>
(sink1, sink2, sink3) =>
import FlowGraph.Implicits._
import GraphDSL.Implicits._
val bcast = b.add(Broadcast[Int](3))
myElements ~> bcast

4
akka-docs-dev/rst/scala/code/docs/stream/cookbook/RecipeGlobalRateLimit.scala
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@ -99,8 +99,8 @@ class RecipeGlobalRateLimit extends RecipeSpec {
val probe = TestSubscriber.manualProbe[String]()
RunnableGraph.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val merge = b.add(Merge[String](2))
source1 ~> merge ~> Sink(probe)
source2 ~> merge

8
akka-docs-dev/rst/scala/code/docs/stream/cookbook/RecipeManualTrigger.scala
View file

@ -18,8 +18,8 @@ class RecipeManualTrigger extends RecipeSpec {
val sink = Sink(sub)
//#manually-triggered-stream
val graph = RunnableGraph.fromGraph(FlowGraph.create() { implicit builder =>
import FlowGraph.Implicits._
val graph = RunnableGraph.fromGraph(GraphDSL.create() { implicit builder =>
import GraphDSL.Implicits._
val zip = builder.add(Zip[Message, Trigger]())
elements ~> zip.in0
triggerSource ~> zip.in1
@ -57,8 +57,8 @@ class RecipeManualTrigger extends RecipeSpec {
val sink = Sink(sub)
//#manually-triggered-stream-zipwith
val graph = RunnableGraph.fromGraph(FlowGraph.create() { implicit builder =>
import FlowGraph.Implicits._
val graph = RunnableGraph.fromGraph(GraphDSL.create() { implicit builder =>
import GraphDSL.Implicits._
val zip = builder.add(ZipWith((msg: Message, trigger: Trigger) => msg))
elements ~> zip.in0

4
akka-docs-dev/rst/scala/code/docs/stream/cookbook/RecipeWorkerPool.scala
View file

@ -19,9 +19,9 @@ class RecipeWorkerPool extends RecipeSpec {
//#worker-pool
def balancer[In, Out](worker: Flow[In, Out, Any], workerCount: Int): Flow[In, Out, Unit] = {
import FlowGraph.Implicits._
import GraphDSL.Implicits._
Flow.fromGraph(FlowGraph.create() { implicit b =>
Flow.fromGraph(GraphDSL.create() { implicit b =>
val balancer = b.add(Balance[In](workerCount, waitForAllDownstreams = true))
val merge = b.add(Merge[Out](workerCount))

4
akka-docs-dev/rst/scala/code/docs/stream/io/StreamTcpDocSpec.scala
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@ -72,8 +72,8 @@ class StreamTcpDocSpec extends AkkaSpec {
connections runForeach { connection =>
val serverLogic = Flow.fromGraph(FlowGraph.create() { implicit b =>
import FlowGraph.Implicits._
val serverLogic = Flow.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
// server logic, parses incoming commands
val commandParser = new PushStage[String, String] {