gwtwwlinker

HTML5 web worker for GWT with Elemental

About

This sample code shows how to compile GWT module to be used as HTML5 web worker.

WorkerLinker is the linker responsible for generating javascript code with minimal GWT overhead (like $wnd and $doc dependencies). Javascript template, located in series of print() commands, contains declaration of $workergwtbridge variable. It also registers message handler, which will pass data received from main process and pass it to $workergwtbridge.

SampleWorker is a class intended to run as worker, compiled with WorkerLinker. In onModuleLoad it instatiates $workergwtbridge function, which is now able to perform calculations implemented in GWT/Java and send back results.

WebApp is a simple GWT app which controls SampleWorker with Worker class from GWT Elemental package and shows data sent back from worker.

Remarks

• Sample gwt.xml's contains only Firefox permutation (gecko1_8), demo is compiled with this setting as well
• There is no automated permutation compilation/naming, you have to work it out yourself (feel free to send patch afterward)
• There is no automated permutation selection either
• The $wnd = {JSON: JSON}; } mock enables you to use autobeans, useful for pushing data structures between worker and main thread
• UserAgent and document compatMode checks are disabled for SampleWorker, as it wouln't work anyway (no access to neither GUI nor $doc)
• Sorry for plain Eclipse project, I'm not yet Maven-educated

Similar works

speed tracer - contains breaky worker discussed here

gwt-ns - compatible with GWT 2.0, abandoned after GWT 2.2

Author

Tomasz Zieliński, [email protected]

License

Licensed under the Apache License, Version 2.0

Attribution

WorkerLinker class is directly derived from Titaniumj Mobile linker licensed under the Apache License, Version 2.0: https://github.com/emitrom/titanium4j/blob/master/src/com/emitrom/ti4j/mobile/linker/TiMobileLinker.java