\n
\/** * Marker interface for custom injector keys, useful to encode object type into the key. * * @tparam T type of object returned by this key *\/ trait InjectorKey[T] \/** * The injector - main interface used to bind code to this injector and access stored objects directly *\/ trait Injector { \/** * Bind this injector to current thread. * @param func code that will be bound to this injector * @tparam T return type * @return value, returned by func *\/ def let[T](func: => T): T def getInstance[T](classTag: ClassTag[T]): Option[T] def getInstance[T](key: Any, classTag: ClassTag[T]): Option[T] \/** * Initialize all known dependencies eagerly. Good for production mode and validation of dependencies. *\/ def eagerInit(): Unit } object Injector { private[depend] val context = new ThreadLocal[Injector]() \/** * Get object instance by type. Fails if this type cannot be resolved to single instance * * @param classTag class tag * @tparam T type of value to return * @return value *\/ def inject[T](implicit classTag: ClassTag[T]): T = injector.getInstance(classTag).getOrElse { throw new InjectorException("No instance registered for " + classTag) } \/** * Get object instance by type and some type-assisted key. Useful if you have multiple instances of the same type. * * @param key key, used to identify object * @param classTag class tag * @tparam T type of value to return * @return value *\/ def inject[T](key: InjectorKey[T])(implicit classTag: ClassTag[T]): T = injector.getInstance(key, classTag).getOrElse { throw new InjectorException("No instance registered for " + classTag + ", key=" + key) } \/** * Get object instance by type and some key. Useful if you have multiple instances of the same type. * * @param key key, used to identify object * @param classTag class tag * @tparam T type of value to return * @return value *\/ def inject[T](key: Any)(implicit classTag: ClassTag[T]): T = injector.getInstance(key, classTag).getOrElse { throw new InjectorException("No instance registered for " + classTag + ", key=" + key) } \/** * Return current injector * @return current injector or exception *\/ def injector: Injector = { val r = context.get() if (r == null) { throw new IllegalStateException("There is no injector in current context. Forgot to run Injector.let for this thread?") } r } } <\/code><\/pre>\n <\/div>\n<\/div>\n
\u0420\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0438\u043d\u0436\u0435\u043a\u0442\u043e\u0440\u0430 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0438\u0437 \u0441\u0435\u0431\u044f \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u0430\u0441\u0441\u043e\u0446\u0438\u0430\u0442\u0438\u0432\u043d\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432 [\u0442\u0438\u043f \u043e\u0431\u044a\u0435\u043a\u0442\u0430] -> [\u043b\u044f\u043c\u0431\u0434\u0430, \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0449\u0430\u044f \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440] \u043f\u043b\u044e\u0441 \u043a\u0435\u0448 \u0434\u043b\u044f \u0441\u0438\u043d\u0433\u043b\u0442\u043e\u043d\u043e\u0432.<\/p>\n
\u0412 \u043a\u043e\u0434\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u043c\u0443 \u043d\u0443\u0436\u043d\u044b \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c inject[Type], \u0447\u0442\u043e\u0431\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043e\u0431\u044a\u0435\u043a\u0442. \u0420\u0430\u0437\u0443\u043c\u0435\u0435\u0442\u0441\u044f, \u043b\u0443\u0447\u0448\u0435 \u0432\u0441\u0435\u0433\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0435\u0433\u043e \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0434\u0435\u0444\u043e\u043b\u0442\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0442\u043e\u0440\u0430.<\/p>\n
\u0427\u0442\u043e \u044d\u0442\u043e \u0434\u0430\u0435\u0442?
\u2014 \u0435\u0441\u043b\u0438 \u043d\u0443\u0436\u0435\u043d \u043d\u0435 \u0441\u0438\u043d\u0433\u043b\u0442\u043e\u043d, \u0430 \u043e\u0431\u044a\u0435\u043a\u0442, \u0442\u043e \u0435\u0433\u043e \u043c\u043e\u0436\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043f\u0440\u043e\u0441\u0442\u043e \u0447\u0435\u0440\u0435\u0437 new MyClass().
\u2014 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0441\u043a\u043e\u0443\u043f\u043e\u0432 \u043d\u0435 \u043d\u0443\u0436\u043d\u0430 \u2014 \u0442\u0435\u043a\u0443\u0449\u0438\u0439 \u0438\u043d\u0436\u0435\u043a\u0442\u043e\u0440 \u0438\u0437 ThreadLocal \u043c\u043e\u0436\u043d\u043e \u0437\u0430\u0432\u0435\u0440\u043d\u0443\u0442\u044c \u0432 \u0434\u0435\u043b\u0435\u0433\u0430\u0442, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u0437\u0430\u043f\u0440\u0430\u0448\u0438\u0432\u0430\u0435\u0442 \u043e\u0431\u044a\u0435\u043a\u0442\u044b \u0438\u0437 \u0438\u043d\u0436\u0435\u043a\u0442\u043e\u0440\u0430 \u0443\u0440\u043e\u0432\u043d\u044f \u0441\u0435\u0441\u0441\u0438\u0438
\u2014 \u043d\u0438\u043a\u0430\u043a\u043e\u0433\u043e \u0440\u0435\u0444\u043b\u0435\u043a\u0448\u043d\u0430
\u2014 \u0438\u043d\u0436\u0435\u043a\u0442\u043e\u0440 \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0432 \u0434\u043e\u043c\u0435\u043d\u043d\u044b\u0445 \u043e\u0431\u044a\u0435\u043a\u0442\u0430\u0445! \u042f \u0434\u0443\u043c\u0430\u044e, \u044d\u0442\u043e \u043e\u0442\u043b\u0438\u0447\u043d\u0430\u044f \u043d\u043e\u0432\u043e\u0441\u0442\u044c \u0434\u043b\u044f \u0432\u0441\u0435\u0445 \u043b\u044e\u0431\u0438\u0442\u0435\u043b\u0435\u0439 \u0437\u0430\u0448\u0438\u0432\u0430\u0442\u044c \u043b\u043e\u0433\u0438\u043a\u0443 \u0432 \u0434\u043e\u043c\u0435\u043d\u043d\u0443\u044e \u043c\u043e\u0434\u0435\u043b\u044c.
\u2014 \u0412 \u043b\u044e\u0431\u043e\u043c \u043c\u0435\u0441\u0442\u0435 \u043a\u043e\u0434\u0430 (\u0438 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u0442\u0435\u0441\u0442\u043e\u0432!) \u043c\u043e\u0436\u043d\u043e \u043b\u0435\u0433\u043a\u043e \u0437\u0430\u043c\u0435\u043d\u0438\u0442\u044c \u0438\u043d\u0436\u0435\u043a\u0442\u043e\u0440, \u043f\u043e\u043b\u0443\u0447\u0430\u044f \u043d\u0443\u0436\u043d\u043e\u0435 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435<\/p>\n
\u041a\u043e\u043d\u0435\u0447\u043d\u043e, \u043f\u043e\u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0434\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0442\u0440\u0435\u0434\u043f\u0443\u043b\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435\u043c, \u0447\u0442\u043e\u0431\u044b \u043f\u0440\u043e\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0442\u044c Injector \u0438\u0437 \u0432\u044b\u0437\u044b\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0432 \u0434\u0440\u0443\u0433\u0438\u0435 \u043f\u043e\u0442\u043e\u043a\u0438, \u043d\u043e \u044d\u0442\u043e \u043d\u0435 \u0442\u0430\u043a \u0443\u0436 \u0441\u043b\u043e\u0436\u043d\u043e.<\/p>\n
\u0422\u0435\u0441\u0442\u044b, \u043e\u043d\u0438 \u0436\u0435 \u043f\u0440\u0438\u043c\u0435\u0440\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f<\/b><\/p>\n\n
class InjectorTest extends FunSuite { import Injector.inject test("basic query by type") { val i = Injector.newModule() .bind[String]("hello") .injector() i.let { assert(inject[String] == "hello") \/\/no object of type Date intercept[InjectorException] { inject[Date] } \/\/we have no keys intercept[InjectorException] { inject[String]("hello") } } } test("objects are singletons") { class A val i = Injector.newModule() .bind[Date](new Date()) .bind[A]("key")(new A) .injector() i.let { assert(inject[Date] eq inject[Date]) assert(inject[A]("key") eq inject[A]("key")) } } test("query by key works") { val i = Injector.newModule() .bind[Date]("key1")(new Date(1)) .bind[Date]("key2")(new Date(2)) .injector() i.let { assert(inject[Date]("key1") == new Date(1)) assert(inject[Date]("key2") == new Date(2)) intercept[InjectorException] { inject[String]("key1") } intercept[InjectorException] { inject[Date]("key3") } } } test("object cannot be bound twice") { intercept[InjectorException] { Injector.newModule() .bind[Date](new Date(0)) .bind[Date](new Date(1)) } } test("Binding with dependencies works") { class A class B case class C(a: A, b: B) val i = Injector.newModule() .bind[C](C(inject[A], inject[B])) .bind[A](new A) .bind[B](new B) .injector() i.let { assert(inject[C].a eq inject[A]) assert(inject[C].b eq inject[B]) } } test("Binding with cyclic dependencies does not work") { case class A(c: C) class B case class C(a: A, b: B) val i = Injector.newModule() .bind[C]{ C(inject[A], inject[B]) } .bind[A](A(inject[C])) .bind[B](new B) .injector() i.let { intercept[InjectorException] { inject[C] } } } test("modularization") { class A class B case class C(a: A, b: B) val m1 = Injector.newModule().bind[C](C(inject[A], inject[B])) val m2 = Injector.newModule() .bind[A](new A) .bind[B](new B) m1.injector().let { intercept[InjectorException] { inject[C] } } (m1 + m2).injector().let { inject[C] } } test("It is possible to inject primitive type") { val i = Injector.newModule() .bind[Int](42) .injector() i.let { assert(inject[Int] == 42) } } } <\/code><\/pre>\n <\/div>\n<\/div>\n
\u0427\u0442\u043e \u0434\u0443\u043c\u0430\u0435\u0442\u0435? <\/p>\n
<\/div>\n
\u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438 https:\/\/habrahabr.ru\/post\/278469\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" \u042d\u0442\u0430 \u0441\u0442\u0430\u0442\u044c\u044f \u043d\u0435 \u043f\u0440\u043e \u043a\u0430\u043a\u0443\u044e-\u0442\u043e \u0433\u043e\u0442\u043e\u0432\u0443\u044e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 (\u044f \u043d\u0430\u043a\u0438\u0434\u0430\u043b \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0441 \u0442\u0435\u0441\u0442\u0430\u043c\u0438 \u0437\u0430 \u043f\u0430\u0440\u0443 \u0434\u043d\u0435\u0439, \u0438, \u0434\u0443\u043c\u0430\u044e, \u0447\u0438\u0442\u0430\u0442\u0435\u043b\u044f\u043c \u043d\u0435 \u0441\u043e\u0441\u0442\u0430\u0432\u0438\u0442 \u0442\u0440\u0443\u0434\u0430 \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0442\u043e \u0436\u0435 \u0441\u0430\u043c\u043e\u0435), \u0430, \u0441\u043a\u043e\u0440\u0435\u0435, \u043f\u043e\u043f\u044b\u0442\u043a\u0430 \u043f\u0440\u0435\u0437\u0435\u043d\u0442\u043e\u0432\u0430\u0442\u044c \u043d\u043e\u0432\u0443\u044e \u0438\u0434\u0435\u044e. \u041a\u043e\u0442\u043e\u0440\u0430\u044f \u0441 \u043c\u043e\u0435\u0439 \u0442\u043e\u0447\u043a\u0438 \u0437\u0440\u0435\u043d\u0438\u044f \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e\u0439.<\/p>\n
\u041e\u0434\u043d\u0430 \u0438\u0437 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u043f\u0440\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043a\u043e\u043b\u044c-\u043b\u0438\u0431\u043e \u0431\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u2014 \u044d\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0435\u0439. \u0421\u043e\u0441\u0442\u043e\u044f\u0449\u0430\u044f \u0438\u0437
\u2014 \u0433\u0434\u0435 \u0432\u0437\u044f\u0442\u044c \u043d\u0443\u0436\u043d\u044b\u0439 \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440 \u043e\u0431\u044a\u0435\u043a\u0442\u0430, \u0435\u0441\u043b\u0438 \u043e\u043d \u0431\u044b\u043b \u0441\u043e\u0437\u0434\u0430\u043d \u00ab\u043d\u0430\u0432\u0435\u0440\u0445\u0443\u00bb, \u0430 \u043d\u0443\u0436\u0435\u043d \u0433\u043b\u0443\u0431\u043e\u043a\u043e \u0432\u043d\u0443\u0442\u0440\u0438 \u0438\u0435\u0440\u0430\u0440\u0445\u0438\u0438 \u0432\u044b\u0437\u043e\u0432\u043e\u0432 \u043c\u0435\u0442\u043e\u0434\u043e\u0432?
\u2014 \u043a\u0430\u043a \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u0435\u043c \u044d\u0442\u043e\u0433\u043e \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440\u0430, \u0447\u0442\u043e\u0431\u044b \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u043f\u043e\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0442\u044c \u0434\u0440\u0443\u0433\u0438\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438? \u041f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u043e \u0434\u043b\u044f \u0442\u0435\u0441\u0442\u043e\u0432
\u2014 \u043a\u0430\u043a \u044d\u0442\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0442\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u0447\u0442\u043e\u0431\u044b \u043b\u044e\u0431\u043e\u0439 \u043a\u0443\u0441\u043e\u043a \u043a\u043e\u0434\u0430 \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c \u0431\u0435\u0437 \u0434\u043e\u043b\u0433\u043e\u0439 \u043f\u043b\u044f\u0441\u043a\u0438 \u0441 \u0431\u0443\u0431\u043d\u043e\u043c \u043d\u0430\u0434 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u043c\u0438 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a\u0430, \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u044e\u0449\u0435\u0433\u043e \u043f.1 \u0438 \u043f.2?<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-275411","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/275411","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=275411"}],"version-history":[{"count":0,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/275411\/revisions"}],"wp:attachment":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=275411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=275411"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=275411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}