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https://issues.apache.org/jira/browse/S4-5?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167014#comment-13167014
]
Leo Neumeyer commented on S4-5:
-------------------------------
I started to work on the AppMaker package. The goal is to use a builder pattern
to build apps and do the bindings with Guice behind the scenes. I started with
the end user API. I'm also considering modifying the App class to extend
Guice's AbstractModule. Suggestions welcomed.
This is how a user would create an app:
{code:title=Prototyping App Builder|borderStyle=dashed}
package org.apache.s4.appbuilder;
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
AppMaker am = new AppMaker();
PEMaker pem1, pem2;
StreamMaker s1;
StreamMaker s2, s3;
pem1 = am.addPE(PEZ.class);
s1 = am.addStream(EventA.class).withName("My first
stream.").withKeyFinder("{gender}").to(pem1);
pem2 = am.addPE(PEY.class).to(s1);
s2 = am.addStream(EventB.class).withName("My second
stream.").withKeyFinder("{age}").to(pem2);
s3 = am.addStream(EventB.class).withName("My third
stream.").withKeyFinder("{height}").to(pem2);
am.addPE(PEX.class).to(s2).to(s3);
}
}
{code}
Notes:
- I am not using generics here, instead I pass the PE and Event types. (I
assume we can build what we want with reflection and only need the type.)
- For now I am doing this as a separate package but this may end up: PEMaker ->
ProcessingElement and StreamMaker -> Stream.
- The KeyFinder needs to be generated from a string. (Can we reuse the code
from 0.3?)
- Need to build the graph using the Guice API.
The branch name is appbuilder. - [GH
repo|https://github.com/leoneu/s4-piper/tree/appbuilder/subprojects/s4-core/src/main/java/org/apache/s4/appbuilder]
> Prototype app builder
> ---------------------
>
> Key: S4-5
> URL: https://issues.apache.org/jira/browse/S4-5
> Project: Apache S4
> Issue Type: New Feature
> Affects Versions: 0.5
> Reporter: Leo Neumeyer
> Priority: Minor
> Fix For: 0.5
>
>
> Extend Guice AbstractModule to create a simple application builder layer. The
> idea is to evaluate if we can use Guice to do all the wiring including PEs
> and Streams and Apps.
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