Reifying.clj

// REPL
inferno.firestore> (reflect EventListener)
{:bases nil, 
 :flags #{:interface :public :abstract}, 
 :members #{#clojure.reflect.Method{:name onEvent, :return-type void, :declaring-class com.google.cloud.firestore.EventListener, :parameter-types [java.lang.Object com.google.cloud.firestore.FirestoreException], :exception-types [], :flags #{:public :abstract}}}}

// CODE
(defn event-listener [c]
  (reify EventListener
    (onEvent [snapshot e]
      (put!
       c
       (if (some? snapshot)
         (-> snapshot (.getData) hashmap->clj)
         {:error true :exception e}))))) 

=> 

2. Unhandled clojure.lang.Compiler$CompilerException
   Error compiling src/inferno/firestore.clj at (74:3)

             Compiler.java: 6925  clojure.lang.Compiler/analyzeSeq
             Compiler.java: 6700  clojure.lang.Compiler/analyze
             Compiler.java: 6906  clojure.lang.Compiler/analyzeSeq
             Compiler.java: 6700  clojure.lang.Compiler/analyze
             Compiler.java: 6656  clojure.lang.Compiler/analyze
             Compiler.java: 6029  clojure.lang.Compiler$BodyExpr$Parser/parse
             Compiler.java: 5406  clojure.lang.Compiler$FnMethod/parse
             Compiler.java: 3972  clojure.lang.Compiler$FnExpr/parse
             Compiler.java: 6916  clojure.lang.Compiler/analyzeSeq
             Compiler.java: 6700  clojure.lang.Compiler/analyze
             Compiler.java: 6906  clojure.lang.Compiler/analyzeSeq
             Compiler.java: 6700  clojure.lang.Compiler/analyze
             Compiler.java:   38  clojure.lang.Compiler/access$300
             Compiler.java:  589  clojure.lang.Compiler$DefExpr$Parser/parse
             Compiler.java: 6918  clojure.lang.Compiler/analyzeSeq
             Compiler.java: 6700  clojure.lang.Compiler/analyze
             Compiler.java: 6656  clojure.lang.Compiler/analyze
             Compiler.java: 6981  clojure.lang.Compiler/eval
             Compiler.java: 7429  clojure.lang.Compiler/load
boot.user2754507741930941962.clj:    1  inferno.firestore/eval6964
boot.user2754507741930941962.clj:    1  inferno.firestore/eval6964
             Compiler.java: 6977  clojure.lang.Compiler/eval
             Compiler.java: 6940  clojure.lang.Compiler/eval
                  core.clj: 3187  clojure.core/eval
                  core.clj: 3183  clojure.core/eval
                  main.clj:  242  clojure.main/repl/read-eval-print/fn
                  main.clj:  242  clojure.main/repl/read-eval-print
                  main.clj:  260  clojure.main/repl/fn
                  main.clj:  260  clojure.main/repl
                  main.clj:  176  clojure.main/repl
               RestFn.java: 1523  clojure.lang.RestFn/invoke
    interruptible_eval.clj:   87  clojure.tools.nrepl.middleware.interruptible-eval/evaluate/fn
                  AFn.java:  152  clojure.lang.AFn/applyToHelper
                  AFn.java:  144  clojure.lang.AFn/applyTo
                  core.clj:  657  clojure.core/apply
                  core.clj: 1963  clojure.core/with-bindings*
                  core.clj: 1963  clojure.core/with-bindings*
               RestFn.java:  425  clojure.lang.RestFn/invoke
    interruptible_eval.clj:   85  clojure.tools.nrepl.middleware.interruptible-eval/evaluate
    interruptible_eval.clj:   55  clojure.tools.nrepl.middleware.interruptible-eval/evaluate
    interruptible_eval.clj:  222  clojure.tools.nrepl.middleware.interruptible-eval/interruptible-eval/fn/fn
    interruptible_eval.clj:  190  clojure.tools.nrepl.middleware.interruptible-eval/run-next/fn
                  AFn.java:   22  clojure.lang.AFn/run
   ThreadPoolExecutor.java: 1149  java.util.concurrent.ThreadPoolExecutor/runWorker
   ThreadPoolExecutor.java:  624  java.util.concurrent.ThreadPoolExecutor$Worker/run
               Thread.java:  748  java.lang.Thread/run

1. Caused by java.lang.IllegalArgumentException
   Can't define method not in interfaces: onEvent