GI developers who want to create high performance GI deployments should take the time to understand and use the suite of build tools that are part of the open source GI project. Only by leveraging the GI build tools will you be able to create applications with the shortest load times and fastest code.
With the source distribution and the build tools you can:
- Create a build of GI with a load profile optimized for a specific GI application
- Compile your own API documentation
- Create an un-obfuscated build of GI for easier debugging
- Create a build of GI or your own application with a default locale other than English
- Optimize your AMP based application
- Create a completely automated build and deployment work flow
I'll try to cover most of these use cases in subsequent posts. First, we need to get set up with the GI source code and build tools.
GI has an Ant-based build process so you need to have a few things installed on your computer to use the build tools:
Ant works on pretty much any operating system. I use Mac OS X Terminal so my examples will look like a Linux prompt. If you are using Windows I recommend installing Cygwin.
Once you have Java and Ant installed you need to get a source distribution of GI. You can download the source distribution of the latest release or grab the code from SVN.
- Release: download the "Source" pre-built package from the Download Page
- SVN: svn co http://svn.generalinterface.org/trunk/gi
If you are using the latest release ZIP, unzip the contents of the archive. I'll refer to this directory as GIHOME (GIHOME contains logger.xml, JSX/ and several other files).
The build tools, scripts and configuration files are all contained in the build/ directory. To make your first build, go to that directory.
To make a build of GI with all of the default settings simply invoke Ant.
|If you see many warnings like "Warning: The encoding 'UTF-8' is not supported by the Java runtime" your Java set up has a XML library that conflicts with the library that GI uses. As a work around always invoke Ant as ant -lib tools/lib/xml/xalan-serializer-2.7.jar.|
|You may get an out of memory error with Ant's default Java settings. You will probably need to increase Ant's maximum heap size to 512 MB. On most systems you can do this by setting the ANT_OPTS environment variable to -Xmx512m.|
The full build process takes about 90 seconds on my machine with the default settings. Later, I'll describe some ways of making the build even faster.
Now, if you look in GIHome/dist/gi you'll see the build of GI that you just created. Open GI_Builder.html in a browser to verify that the build was successful.
All build settings are contained in the file GIHome/build/build.properties. There are two recommended ways of overriding these default settings. The first is on the command line and the second is with the user.properties file.
To modify a property on the command line when you invoke Ant, add -DpropName=propValue to the command invocation. See the Ant documentation for more information.
To modify a property semi-permanently so that you don't have to add it to the command line each time you invoke Ant, create a file GIHome/build/user.properties. Any properties defined in this file take precedence over those in build.properties.
|Don't modify build.properties yourself as this file is owned and maintained by the GI distribution and often changes between GI releases.|
As a first example, let's make a build of GI where the jsx3.gui.Matrix class is included in the load profile. Including Matrix in the load profile will speed up the load time of applications that use Matrix. First, invoke the clean target in Ant. This step is usually necessary to prevent errors.
Next, invoke the default target while overriding the build.gi.includes.jsx build property.
(To include multiple classes format them as a comma-delimited list.) If you check the build you will see that the Matrix.js file does not exist, meaning that it has been baked into jsx.js, which defines the load profile.
You can make the build process faster by having it do less. Often when creating a custom build of GI you do not need to compile the API documentation or Builder documentation. To remove these steps from the build process add the following to your user.properties.
If you don't need to create an internationalized version of GI add the following, which excludes all locales other than en_US.
If you are creating a build of GI for deployment only and not for running Builder, you can exclude Builder from the build by adding the following.
If I include all these overrides I can get the build time down to about 20 seconds.
I plan to go into much more detail describing all the advanced things you can accomplish with the GI build tools. Watch this blog for updates.