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Pi is not a constant, it has changed

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Patrik Nordwall 2012-02-08 13:37:19 +01:00
parent c43b024cac
commit 81451208f1
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24
akka-docs/intro/getting-started-first-scala.rst
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@ -49,7 +49,7 @@ check out the full tutorial from the Akka GitHub repository. It is in the
`here`__, with the actual source code `here`__.
__ https://github.com/jboner/akka/tree/master/akka-tutorials/akka-tutorial-first
__ https://github.com/jboner/akka/blob/master/akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala
__ https://github.com/jboner/akka/blob/master/akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala
To check out the code using Git invoke the following::
@ -244,7 +244,7 @@ Now it's about time to start hacking.
We start by creating a ``Pi.scala`` file and adding these import statements at
the top of the file:
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#imports
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#imports
If you are using SBT in this tutorial then create the file in the
``src/main/scala`` directory.
@ -282,7 +282,7 @@ start by creating three messages as case classes. We also create a common base
trait for our messages (that we define as being ``sealed`` in order to prevent
creating messages outside our control):
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#messages
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#messages
Creating the worker
@ -293,7 +293,7 @@ trait and defining the ``receive`` method. The ``receive`` method defines our
message handler. We expect it to be able to handle the ``Work`` message so we
need to add a handler for this message:
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#worker
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#worker
:exclude: calculatePiFor
As you can see we have now created an ``Actor`` with a ``receive`` method as a
@ -308,7 +308,7 @@ The only thing missing in our ``Worker`` actor is the implementation on the
algorithm in Scala, in this introductory tutorial we have chosen an imperative
style using a for comprehension and an accumulator:
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#calculatePiFor
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#calculatePiFor
Creating the master
@ -317,7 +317,7 @@ Creating the master
The master actor is a little bit more involved. In its constructor we create a round-robin router
to make it easier to spread out the work evenly between the workers. Let's do that first:
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#create-router
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#create-router
Now we have a router that is representing all our workers in a single
abstraction. So now let's create the master actor. We pass it three integer variables:
@ -328,7 +328,7 @@ abstraction. So now let's create the master actor. We pass it three integer vari
Here is the master actor:
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#master
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#master
:exclude: handle-messages
A couple of things are worth explaining further.
@ -355,7 +355,7 @@ will propagate down to all its supervised 'children'.
Let's capture this in code:
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#master-receive
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#master-receive
Creating the result listener
@ -364,7 +364,7 @@ Creating the result listener
The listener is straightforward. When it receives the ``PiApproximation`` from the ``Master`` it
prints the result and shuts down the ``ActorSystem``.
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#result-listener
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#result-listener
Bootstrap the calculation
=========================
@ -378,7 +378,7 @@ The ``Pi`` object is a perfect container module for our actors and messages, so
let's put them all there. We also create a method ``calculate`` in which we
start up the ``Master`` actor and wait for it to finish:
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala#app
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala#app
:exclude: actors-and-messages
As you can see the *calculate* method above it creates an ``ActorSystem`` and this is the Akka container which
@ -392,14 +392,14 @@ That's it. Now we are done.
But before we package it up and run it, let's take a look at the full code now,
with package declaration, imports and all:
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala
.. includecode:: ../../akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala
Run it as a command line application
====================================
If you have not typed in (or copied) the code for the tutorial as in
``$AKKA_HOME/akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala`` then now is the time.
``$AKKA_HOME/akka-tutorials/akka-tutorial-first/src/main/scala/akka/tutorial/first/scala/Pi.scala`` then now is the time.
When that's done open up a shell and step in to the Akka distribution (``cd $AKKA_HOME``).
First we need to compile the source file. That is done with Scala's compiler