Add a comment. Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. Normally, invoking a function will cause a var to be dereferenced to find the function instance implementing it, then invoking that function.
This indirection via the var is one of the ways that Clojure provides a dynamic runtime environment. However, it has long been observed that the majority of function invocations in a production environment are never redefined in this way, incurring unnecessary redirection. Direct linking can be used to replace this indirection with a direct static invocation of the function instead.
This will result in faster var invocation. Additionally, the compiler can remove unused vars from class initialization and direct linking will make many more vars unused. Typically this results in smaller class sizes and faster startup times. One consequence of direct linking is that var redefinitions will not be seen by code that has been compiled with direct linking because direct linking avoids dereferencing the var. Classes generated by Clojure are highly dynamic. In particular, note that no method bodies or other implementation details are specified in gen-class - it specifies only a signature, and the class that it generates is only a stub.
This stub class defers all implementation to functions defined in the implementing namespace. At runtime, a call to some method foo of the generated class will find the current value of the var implementing. If the var is not bound or nil, it will call the superclass method, or if an interface method, generate an UnsupportedOperationException. In the simplest case, an empty :gen-class is supplied, and the compiled class has only main, which is implemented by defining -main in the namespace.
And can be run like an ordinary Java app like so be sure to include the output classes directory :.
In this case we are creating classes we intend to create instances of. The clojure. Iterator, a particularly nasty interface, in that it requires the implementation to be stateful. This class is going to take a String in its constructor and implement the Iterator interface in terms of delivering the characters from the string. The :init clause names the constructor function. The :constructors clause is a map of constructor signature to superclass constructor signature.
In this case, the superclass defaults to Object, whose constructor takes no arguments. This object will have state, called state, and a main so we can test it. The second element of the vector is the state for the instance. I've been meaning to get around to that. I just put it in the mail this morning. That's great. The time to process after receipt has been quite variable. Let me know when you're listed and I'll be able to pull in the code. In the meantime, I will take a closer look.
So it appears that I am now on the contributor list - didn't receive any notification, but my name is there now. Did you get a chance to look at any of the changes? By now I have made several modifications and also merged them with your nodlr branch.
Would you suggest possibly submitting a pull request or creating a JIRA ticket with patches? This directory must be in the classpath for 'compile' to work. Default: false. Defaults to false. If you compile by invoking the compile function, such as from a REPL, you will have had a chance to set these vars to appropriate values.
However, when compiling from the command line by running Clojure. Instead, you can set environment variables to initialize these vars prior to compilation. The same is true for Clojure. In fact, ClojureCLR and Clojure used the same environment variables for these variables until just recently. Starting with the 1. This is due to problems with periods in environment variable names in Cygwin's bash -- see this thread for more information. Locating files. ClojureCLR follows Clojure in mapping dotted symbol names to relative paths.
In addition, it will look first in the current directory and directory of the entry assembly. The same holds for load , use , require and other lib-loading functions.
The Clojure compiler outputs many class files. The ClojureCLR compiler outputs not as many assemblies. All classes resulting from compile 'a. At the moment the same set of roots as named above is used for assemblies and source code.
Each file loaded during compilation will go into its own assembly. I find this terribly inelegant.
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