Add Immutant/Clojure (#3634)

frameworks/Clojure/immutant/README.md

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+# Immutant Benchmarking Test
+
+This is the [Immutant](http://immutant.org/) portion of a [benchmarking test suite](../) comparing a variety of web development platforms.
+
+### JSON Encoding Test
+
+* [JSON test source](hello/src/hello/handler.clj)
+
+## Infrastructure Software Versions
+
+The dependencies are documented in [project.clj](hello/project.clj),
+but the main ones are:
+
+* [Clojure 1.9.0](http://clojure.org/)
+* [ikitommi/immutant-web "3.0.0-alpha1"](https://github.com/ikitommi/immutant) - a performant fork of [Immutant]((http://immutant.org/))
+* [metosin/jsonista "0.1.1"](https://github.com/metosin/jsonista)
+
+## Test URLs
+### JSON Encoding Test
+
+http://localhost:8080/json
+
+### Plaintext Test
+
+http://localhost:8080/plaintext

frameworks/Clojure/immutant/benchmark_config.json

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+{
+  "framework": "immutant",
+  "tests": [{
+    "default": {
+      "json_url": "/json",
+      "plaintext_url": "/plaintext",
+      "port": 8080,
+      "approach": "Realistic",
+      "classification": "Micro",
+      "database": "None",
+      "framework": "immutant",
+      "language": "Clojure",
+      "flavor": "None",
+      "orm": "Raw",
+      "platform": "Undertow",
+      "webserver": "None",
+      "os": "Linux",
+      "database_os": "Linux",
+      "display_name": "immutant",
+      "notes": "",
+      "versus": "Undertow"
+    }
+  }]
+}

frameworks/Clojure/immutant/immutant.dockerfile

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+FROM clojure:lein-2.8.1
+WORKDIR /immutant
+COPY src src
+COPY project.clj project.clj
+RUN lein uberjar
+CMD ["java", "-server", "-XX:+UseNUMA", "-XX:+UseParallelGC", "-XX:+AggressiveOpts", "-jar", "target/hello-immutant-standalone.jar"]

frameworks/Clojure/immutant/project.clj

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+(defproject hello "immutant"
+  :description "Immutant, Jsonista"
+  :dependencies [[org.clojure/clojure "1.9.0"]
+                 [ikitommi/immutant-web "3.0.0-alpha1"]
+                 [metosin/jsonista "0.1.1"]]
+  :jvm-opts ^:replace ["-Dclojure.compiler.direct-linking=true"]
+  :main hello.handler
+  :aot :all)

frameworks/Clojure/immutant/src/hello/handler.clj

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+(ns hello.handler
+  (:require [immutant.web :as web]
+            [jsonista.core :as json])
+  (:gen-class))
+
+(def plaintext-response
+  {:status 200
+   :headers {"content-type" "text/plain; charset=utf-8"}
+   :body (.getBytes "Hello, World!")})
+
+(defn app [req]
+  (let [uri (:uri req)]
+    (cond
+      (.equals "/plaintext" uri) plaintext-response
+      (.equals "/json" uri) {:status 200
+                             :headers {"content-type" "application/json"}
+                             :body (json/write-value-as-bytes {:message "Hello, World!"})}
+      :else {:status 404})))
+
+(defn -main [& _]
+  (web/run
+    app
+    {:port 8080
+     :host "0.0.0.0"
+     :dispatch? false
+     :server {:always-set-keep-alive false}}))

frameworks/Clojure/immutant/src/log4j.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
+<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
+  <logger name="com.mchange">
+    <level value="WARN"/>
+  </logger>
+</log4j:configuration>