It separates the resource management from the creation and lexical binding of resources. You can create a scope high up in the call stack, and within the dynamic extent of that scope you can create resources, return them from functions and freely use them; when the scope eventually exits, then the resources will be cleaned up.
This library does also generalize a bit to allow you to register an object and a clean up function, or even just a thunk to get called when the scope exits. On Friday, October 11, 2013 7:56:52 AM UTC-4, Cedric Greevey wrote: > > What does this do that (with-open ...) doesn't do? Generalize to other > cleanup methods than (.close x)? > > > On Fri, Oct 11, 2013 at 6:36 AM, Paul Stadig <pa...@stadig.name<javascript:> > > wrote: > >> I have released version 0.1.0 of scopes, a little library for resource >> scopes. It can be used to establish a resource scope with the >> with-resource-scope macro. Within the dynamic extent of that macro one can >> register a resource with the scoped! function so that when the macrco block >> goes out of scope .close is called on the registered resource. >> >> An object and function can also be registered with (scoped! x (fn [x] >> ...)) so that when the macro block goes out of scope the function will be >> called and given x as an argument. >> >> There is also a shorthand function called scoped-thunk! that will >> register a thunk (a function taking no arguments) to be called when the >> macro block goes out of scope. >> >> The scopes library also defines a function named closeable? that will >> return true if its argument implements java.lang.AutoCloseable. >> >> Because scopes uses the java.lang.AutoCloseable interface and the >> exception supression mechanism, it is only compatible with Java 7. >> >> Finally, there is also a scopes-magic artifact, and when it is on the >> classpath it will automatically pull in the scopes library and add >> with-resource-scope, scoped!, scoped-thunk!, and closeable? to clojure.core >> so that they are automatically available everywhere with out having to be >> imported. I'm not saying that this is necessarily a good idea, but there it >> is. :) >> >> https://clojars.org/pjstadig/scopes >> https://clojars.org/pjstadig/scopes-magic >> >> >> Paul >> >> -- >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com<javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
