I'm trying to keep to good practices in my projects and tools going
forward, and seem to either be doing something very wrong, or have hit a
possible bug in GWT. Specifically, the selection script seems to look at my
one property with three different values, and believes that not only are
there three different permutations, but that each has three different
soft-permutations:
unflattenKeylistIntoAnswers(['en'], 'F03147777FEB034474EBDDEB584EAAEB');
unflattenKeylistIntoAnswers(['es'], 'F03147777FEB034474EBDDEB584EAAEB');
unflattenKeylistIntoAnswers(['fr'], 'F03147777FEB034474EBDDEB584EAAEB');
unflattenKeylistIntoAnswers(['en'], 'F03147777FEB034474EBDDEB584EAAEB' +
':1');
unflattenKeylistIntoAnswers(['es'], 'F03147777FEB034474EBDDEB584EAAEB' +
':1');
unflattenKeylistIntoAnswers(['fr'], 'F03147777FEB034474EBDDEB584EAAEB' +
':1');
unflattenKeylistIntoAnswers(['en'], 'F03147777FEB034474EBDDEB584EAAEB' +
':2');
unflattenKeylistIntoAnswers(['es'], 'F03147777FEB034474EBDDEB584EAAEB' +
':2');
unflattenKeylistIntoAnswers(['fr'], 'F03147777FEB034474EBDDEB584EAAEB' +
':2');
strongName = answers[computePropValue('locale')];
I've created a minimal sample project at
https://github.com/niloc132/system-property-permtations with a README,
copied below for ease of conversation, but here are the relevant files to
read:
Module file:
https://github.com/niloc132/system-property-permtations/blob/master/src/main/java/com/colinalworth/gwt/sysprops/SystemPropertyBasedPermutations.gwt.xml
Three html files, each with their own property value set:
https://github.com/niloc132/system-property-permtations/tree/master/src/main/java/com/colinalworth/gwt/sysprops/public
Entrypoint, interface/factory and three "generated" implementations:
https://github.com/niloc132/system-property-permtations/blob/master/src/main/java/com/colinalworth/gwt/sysprops/client/SystemPropertyBasedPermutations.java
Same three html files, hosted with compiled code to be runnable:
https://niloc132.github.io/system-property-permtations/en.html
https://niloc132.github.io/system-property-permtations/fr.html
https://niloc132.github.io/system-property-permtations/es.html
Am I doing this wrong, or is this not expected to work at all without
actual <replace-with> or <generate-with> code?
---
This project is a quick attempt at using System.getProperty and generated
sources (via APT or some other mechanism) in place of GWT.create and
<replace-with> or <generate-with> rules to provide multiple alternate
runtime implementations.
There are three HTML files, each of which has a different setting for
window.locale, en.html
<https://niloc132.github.io/system-property-permtations/en.html>, fr.html
<https://niloc132.github.io/system-property-permtations/fr.html>, and
es.html <https://niloc132.github.io/system-property-permtations/es.html>.
Here is en.html:
<!doctype html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript"
language="javascript">window.locale='en';</script>
<script type="text/javascript" language="javascript"
src="sysprops.nocache.js"></script>
</head>
<body>
</body>
</html>
The module file then describes these three properties, and simple selection
script to pick out the window.locale above:
<define-property name="locale" values="en,fr,es" />
<property-provider name="locale">
return window.locale;
</property-provider>
And finally the entrypoint has a simple switch case to select an
implementation based on the value of `System.getProperty("locale"):
Window.getSelf().alert("Locale is " + System.getProperty("locale"));
Window.getSelf().alert("Greeting is " + constants.hello());
At present however, the wrong property is read from System.getProperty,
and so the wrong implementation is selected, and only one permutation is
compiled:
[INFO] --- gwt-maven-plugin:2.8.0:compile (default) @
system-property-permutations ---
[INFO] auto discovered modules
[com.colinalworth.gwt.sysprops.SystemPropertyBasedPermutations]
[INFO] Compiling module
com.colinalworth.gwt.sysprops.SystemPropertyBasedPermutations
[INFO] Compiling 1 permutation
[INFO] Compiling permutation 0...
[INFO] Compile of permutations succeeded
[INFO] Compilation succeeded -- 4.529s
[INFO] Linking into
/Users/colin/workspace/system-property-permutations/target/system-property-permutations-1.0-SNAPSHOT/sysprops
[INFO] Link succeeded
[INFO] Linking succeeded -- 0.206s
The unflattenKeylistIntoAnswers seems to be generated with not only soft
permutations where it isn't appropriate, but also seems to think that three
permutations are required:
unflattenKeylistIntoAnswers(['en'], 'F03147777FEB034474EBDDEB584EAAEB');
unflattenKeylistIntoAnswers(['es'], 'F03147777FEB034474EBDDEB584EAAEB');
unflattenKeylistIntoAnswers(['fr'], 'F03147777FEB034474EBDDEB584EAAEB');
unflattenKeylistIntoAnswers(['en'], 'F03147777FEB034474EBDDEB584EAAEB' +
':1');
unflattenKeylistIntoAnswers(['es'], 'F03147777FEB034474EBDDEB584EAAEB' +
':1');
unflattenKeylistIntoAnswers(['fr'], 'F03147777FEB034474EBDDEB584EAAEB' +
':1');
unflattenKeylistIntoAnswers(['en'], 'F03147777FEB034474EBDDEB584EAAEB' +
':2');
unflattenKeylistIntoAnswers(['es'], 'F03147777FEB034474EBDDEB584EAAEB' +
':2');
unflattenKeylistIntoAnswers(['fr'], 'F03147777FEB034474EBDDEB584EAAEB' +
':2');
strongName = answers[computePropValue('locale')];
I think that this results in fr always being selected. Am I doing this
wrong, or is System.getProperty only usable for properties which actually
have a completely different implementation via <replace-with> or
<generate-with>?
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