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(.module:
[library
[lux #*
["@" target]
["." ffi (#+ import: object do_to)]
[abstract
[monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]
["." io (#+ IO)]
[concurrency
["." atom (#+ Atom)]]]
[data
["." binary (#+ Binary)]
["." text
["%" format (#+ format)]]
[collection
["." array]
["." dictionary (#+ Dictionary)]]]]])
(type: #export Library
(Atom (Dictionary Text Binary)))
(exception: #export (already_stored {class Text})
(exception.report
["Class" class]))
(exception: #export (unknown {class Text})
(exception.report
["Class" class]))
(exception: #export (cannot_define {class Text} {error Text})
(exception.report
["Class" class]
["Error" error]))
(import: java/lang/Object
["#::."
(getClass [] (java/lang/Class java/lang/Object))])
(import: java/lang/String)
(import: java/lang/reflect/Method
["#::."
(invoke [java/lang/Object [java/lang/Object]] #try java/lang/Object)])
(import: (java/lang/Class a)
["#::."
(getDeclaredMethod [java/lang/String [(java/lang/Class [? < java/lang/Object])]] java/lang/reflect/Method)])
(import: java/lang/Integer
["#::."
(#static TYPE (java/lang/Class java/lang/Integer))])
(import: java/lang/reflect/AccessibleObject
["#::."
(setAccessible [boolean] void)])
(import: java/lang/ClassLoader
["#::."
(loadClass [java/lang/String]
#io #try (java/lang/Class java/lang/Object))])
(with_expansions [<elemT> (as_is (java/lang/Class java/lang/Object))]
(def: java/lang/ClassLoader::defineClass
java/lang/reflect/Method
(let [signature (|> (ffi.array <elemT> 4)
(ffi.array_write 0 (:as <elemT>
(ffi.class_for java/lang/String)))
(ffi.array_write 1 (java/lang/Object::getClass (ffi.array byte 0)))
(ffi.array_write 2 (:as <elemT>
(java/lang/Integer::TYPE)))
(ffi.array_write 3 (:as <elemT>
(java/lang/Integer::TYPE))))]
(do_to (java/lang/Class::getDeclaredMethod "defineClass"
signature
(ffi.class_for java/lang/ClassLoader))
(java/lang/reflect/AccessibleObject::setAccessible true)))))
(def: #export (define class_name bytecode loader)
(-> Text Binary java/lang/ClassLoader (Try java/lang/Object))
(let [signature (array.of_list (list (:as java/lang/Object
class_name)
(:as java/lang/Object
bytecode)
(:as java/lang/Object
(|> 0
(:as (primitive "java.lang.Long"))
ffi.long_to_int))
(:as java/lang/Object
(|> bytecode
binary.size
(:as (primitive "java.lang.Long"))
ffi.long_to_int))))]
(java/lang/reflect/Method::invoke loader signature java/lang/ClassLoader::defineClass)))
(def: #export (new_library _)
(-> Any Library)
(atom.atom (dictionary.new text.hash)))
(def: #export (memory library)
(-> Library java/lang/ClassLoader)
(with_expansions [<cast> (for {@.old
(<|)
@.jvm
"jvm object cast"})]
(<| <cast>
(object [] java/lang/ClassLoader []
[]
(java/lang/ClassLoader (findClass self {class_name java/lang/String})
(java/lang/Class [? < java/lang/Object])
#throws [java/lang/ClassNotFoundException]
(let [class_name (:as Text class_name)
classes (|> library atom.read io.run)]
(case (dictionary.get class_name classes)
(#.Some bytecode)
(case (..define class_name bytecode (<| <cast> self))
(#try.Success class)
(:assume class)
(#try.Failure error)
(error! (exception.construct ..cannot_define [class_name error])))
#.None
(error! (exception.construct ..unknown [class_name])))))))))
(def: #export (store name bytecode library)
(-> Text Binary Library (IO (Try Any)))
(do {! io.monad}
[library' (atom.read library)]
(if (dictionary.key? library' name)
(wrap (exception.throw ..already_stored name))
(do !
[_ (atom.update (dictionary.put name bytecode) library)]
(wrap (#try.Success []))))))
(def: #export (load name loader)
(-> Text java/lang/ClassLoader
(IO (Try (java/lang/Class java/lang/Object))))
(java/lang/ClassLoader::loadClass name loader))
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