[GitHub] [camel-quarkus] lburgazzoli commented on a change in pull request #2048: CSimple language support

[GitBox <gi...@apache.org>]

lburgazzoli commented on a change in pull request #2048:
URL: https://github.com/apache/camel-quarkus/pull/2048#discussion_r535240497



##########
File path: extensions-core/core/deployment/src/main/java/org/apache/camel/quarkus/core/deployment/CSimpleLanguageProcessor.java
##########
@@ -0,0 +1,455 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.quarkus.core.deployment;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.AbstractMap.SimpleImmutableEntry;
+import java.util.ArrayDeque;
+import java.util.Collections;
+import java.util.Deque;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Marshaller;
+import javax.xml.bind.Marshaller.Listener;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.ContentHandler;
+import org.xml.sax.Locator;
+import org.xml.sax.SAXException;
+
+import io.quarkus.bootstrap.classloading.ClassPathElement;
+import io.quarkus.bootstrap.classloading.QuarkusClassLoader;
+import io.quarkus.deployment.annotations.BuildProducer;
+import io.quarkus.deployment.annotations.BuildStep;
+import io.quarkus.deployment.annotations.ExecutionTime;
+import io.quarkus.deployment.annotations.Record;
+import io.quarkus.deployment.builditem.GeneratedClassBuildItem;
+import io.quarkus.deployment.dev.CompilationProvider;
+import io.quarkus.deployment.dev.CompilationProvider.Context;
+import io.quarkus.deployment.dev.JavaCompilationProvider;
+import io.quarkus.runtime.RuntimeValue;
+import org.apache.camel.Exchange;
+import org.apache.camel.NamedNode;
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.language.csimple.CSimpleCodeGenerator;
+import org.apache.camel.language.csimple.CSimpleGeneratedCode;
+import org.apache.camel.language.csimple.CSimpleHelper;
+import org.apache.camel.language.csimple.CSimpleLanguage;
+import org.apache.camel.model.Constants;
+import org.apache.camel.model.ExpressionNode;
+import org.apache.camel.quarkus.core.CSimpleLanguageRecorder;
+import org.apache.camel.quarkus.core.deployment.spi.CSimpleExpressionSourceBuildItem;
+import org.apache.camel.quarkus.core.deployment.spi.CamelBeanBuildItem;
+import org.apache.camel.quarkus.core.deployment.spi.CamelContextBuildItem;
+import org.apache.camel.quarkus.core.deployment.spi.CamelRoutesBuilderClassBuildItem;
+import org.apache.camel.quarkus.core.deployment.spi.CompiledCSimpleExpressionBuildItem;
+import org.apache.camel.util.PropertiesHelper;
+
+class CSimpleLanguageProcessor {
+    static final String CLASS_EXT = ".class";
+
+    @BuildStep
+    void collectCSimpleExpresions(
+            List<CamelRoutesBuilderClassBuildItem> routesBuilderClasses,
+            BuildProducer<CSimpleExpressionSourceBuildItem> csimpleExpressions)
+            throws IOException, ClassNotFoundException, URISyntaxException, JAXBException {
+
+        if (!routesBuilderClasses.isEmpty()) {
+            final ClassLoader loader = Thread.currentThread().getContextClassLoader();
+            if (!(loader instanceof QuarkusClassLoader)) {
+                throw new IllegalStateException(
+                        QuarkusClassLoader.class.getSimpleName() + " expected as the context class loader");
+            }
+
+            final ExpressionCollector collector = new ExpressionCollector(loader);
+
+            for (CamelRoutesBuilderClassBuildItem routesBuilderClass : routesBuilderClasses) {
+                final String className = routesBuilderClass.getDotName().toString();
+                final Class<?> cl = loader.loadClass(className);
+
+                if (RouteBuilder.class.isAssignableFrom(cl)) {
+                    try {
+                        final RouteBuilder rb = (RouteBuilder) cl.newInstance();
+                        rb.configure();

Review comment:
       I'm not very sure if this is always enough or if you need to set a camel context, as example if the route invokes [this method](https://github.com/apache/camel/blob/master/core/camel-core-model/src/main/java/org/apache/camel/builder/RouteBuilder.java#L286), then you'll get an NPE. In general the builder assumes that the camel context is set when `configure()`.




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