From 8719abd3e69964f98d4f4b80f336803736a9610b Mon Sep 17 00:00:00 2001
From: lburgazzoli <lburgazzoli@gmail.com>
Date: Mon, 15 Jul 2019 21:40:08 +0200
Subject: [PATCH] Switch to GraalJS #99

---
 camel-k-runtime-jvm/pom.xml                   |  6 +++
 .../camel/k/jvm/loader/JavaScriptLoader.java  | 46 +++++++++----------
 pom.xml                                       |  1 +
 3 files changed, 30 insertions(+), 23 deletions(-)

diff --git a/camel-k-runtime-jvm/pom.xml b/camel-k-runtime-jvm/pom.xml
index 4c5caab70..48bcb2e6d 100644
--- a/camel-k-runtime-jvm/pom.xml
+++ b/camel-k-runtime-jvm/pom.xml
@@ -72,6 +72,12 @@
             <version>${commons-lang.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.graalvm.js</groupId>
+            <artifactId>js</artifactId>
+            <version>${graalvm.version}</version>
+        </dependency>
+
         <!-- ****************************** -->
         <!--                                -->
         <!-- TESTS                          -->
diff --git a/camel-k-runtime-jvm/src/main/java/org/apache/camel/k/jvm/loader/JavaScriptLoader.java b/camel-k-runtime-jvm/src/main/java/org/apache/camel/k/jvm/loader/JavaScriptLoader.java
index e638a47be..5b519abde 100644
--- a/camel-k-runtime-jvm/src/main/java/org/apache/camel/k/jvm/loader/JavaScriptLoader.java
+++ b/camel-k-runtime-jvm/src/main/java/org/apache/camel/k/jvm/loader/JavaScriptLoader.java
@@ -20,12 +20,6 @@
 import java.io.InputStreamReader;
 import java.util.Collections;
 import java.util.List;
-import java.util.function.Function;
-import java.util.function.Supplier;
-import javax.script.Bindings;
-import javax.script.ScriptEngine;
-import javax.script.ScriptEngineManager;
-import javax.script.SimpleBindings;
 
 import org.apache.camel.CamelContext;
 import org.apache.camel.builder.RouteBuilder;
@@ -33,9 +27,9 @@
 import org.apache.camel.k.Source;
 import org.apache.camel.k.jvm.dsl.Components;
 import org.apache.camel.k.support.URIResolver;
-import org.apache.camel.model.RouteDefinition;
-import org.apache.camel.model.rest.RestConfigurationDefinition;
-import org.apache.camel.model.rest.RestDefinition;
+import org.graalvm.polyglot.Context;
+import org.graalvm.polyglot.Value;
+import org.graalvm.polyglot.proxy.ProxyExecutable;
 
 public class JavaScriptLoader implements RoutesLoader {
     @Override
@@ -49,24 +43,30 @@ public RouteBuilder load(CamelContext camelContext, Source source) throws Except
             @Override
             public void configure() throws Exception {
                 final CamelContext context = getContext();
-                final ScriptEngineManager manager = new ScriptEngineManager();
-                final ScriptEngine engine = manager.getEngineByName("nashorn");
-                final Bindings bindings = new SimpleBindings();
 
-                // Exposed to the underlying script, but maybe better to have
-                // a nice dsl
-                bindings.put("builder", this);
-                bindings.put("context", context);
-                bindings.put("components", new Components(context));
-                bindings.put("registry", camelContext.getRegistry());
-                bindings.put("from", (Function<String, RouteDefinition>) uri -> from(uri));
-                bindings.put("rest", (Supplier<RestDefinition>) () -> rest());
-                bindings.put("restConfiguration", (Supplier<RestConfigurationDefinition>) () -> restConfiguration());
+                try (Context ctx = createPolyglotContext(); InputStream is = URIResolver.resolve(context, source)) {
+                    Value bindings = ctx.getBindings("js");
+                    bindings.putMember("builder", this);
+                    bindings.putMember("context", context);
+                    bindings.putMember("components", new Components(context));
+                    bindings.putMember("registry", context.getRegistry());
 
-                try (InputStream is = URIResolver.resolve(context, source)) {
-                    engine.eval(new InputStreamReader(is), bindings);
+                    bindings.putMember("from", (ProxyExecutable) args -> from(args[0].asString()));
+                    bindings.putMember("rest", (ProxyExecutable) args -> rest());
+                    bindings.putMember("restConfiguration", (ProxyExecutable) args -> restConfiguration());
+
+                    ctx.eval(
+                        org.graalvm.polyglot.Source.newBuilder(
+                            "js",
+                            new InputStreamReader(is), source.getName()
+                        ).build()
+                    );
                 }
             }
         };
     }
+
+    private static Context createPolyglotContext() {
+        return Context.newBuilder("js").allowAllAccess(true).build();
+    }
 }
diff --git a/pom.xml b/pom.xml
index 00984530d..a92cbc806 100644
--- a/pom.xml
+++ b/pom.xml
@@ -53,6 +53,7 @@
         <immutables.version>2.7.5</immutables.version>
         <semver4j.version>2.2.0</semver4j.version>
         <undertow.version>1.4.26.Final</undertow.version>
+        <graalvm.version>19.0.2</graalvm.version>
         <gmavenplus-plugin.version>1.7.1</gmavenplus-plugin.version>
         <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
         <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>