By Justin Edelson
In case you are attracted to JRuby, you most likely don't want a turorial on Ruby, Rails, or Java - you simply want to know tips on how to get issues performed. This Cookbook deals sensible suggestions for utilizing the Java implementation of the Ruby language, with designated recipes for deploying Rails net functions on Java servers, integrating JRuby code with Java applied sciences, constructing JRuby computing device functions with Java toolkits, and extra.
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Extra info for JRuby Cookbook
It’s highly advised that you set a maximum number of runtimes for your production application because by default Warbler will allow for an unlimited number of runtimes. runtimes This sets the most number of active JRuby runtimes in the pool, which determines the maximum number of simultaneous requests. Default value is unlimited. runtimes This determines the number of “warm” runtimes or the minimum number of runtimes in the pool. It also dictates how many instances when the application is started.
It is built on the Rake build system and JRuby-Rack servlet adapter. 2 Packaging Rails As a Java EE Web Application | 37 to process the static content rather than Rails. Early versions of Warbler used the GoldSpike servlet, but the GoldSpike project has been deprecated and has been replaced by JRuby-Rack. The JRuby-Rack library includes a stub version of the GoldSpike servlet in order to maintain compatibility with legacy GoldSpike applications. The unpacked source of the WAR file is found in the newly created tmp/war folder in the project’s home directory.
More information about Buildr can be found in Chapter 6. 8 Extending a Java Class in Ruby | 17 Discussion The fact that the same syntax is used to extend both Java and Ruby classes is an important design feature of JRuby, as it furthers the seamless integration between the two languages. One notable exception to this recipe is classes that use Java 5 generics. Currently, these cannot be subclassed with Ruby classes. Abstract Java classes can also be extended by Ruby classes. Examples 1-14 and 1-15 show an example of an abstract Java class and a concrete Ruby class that extends the former.