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commit 09549a6719a5d3fc4054e5d09e000003c62fcbac
Author: Claus Ibsen <claus.ib...@gmail.com>
AuthorDate: Wed Aug 3 11:31:14 2022 +0200
CAMEL-18339: Java DSL (joor) - Allow compiled classes to be loadable from
anywhere in Camel
---
.../java/org/apache/camel/spi/ClassResolver.java | 7 ++++
.../camel/impl/engine/DefaultClassResolver.java | 30 +++++++++++----
.../camel/dsl/java/joor/JavaJoorClassLoader.java | 45 ++++++++++++++++++++++
.../dsl/java/joor/JavaRoutesBuilderLoader.java | 14 +++++++
4 files changed, 89 insertions(+), 7 deletions(-)
diff --git
a/core/camel-api/src/main/java/org/apache/camel/spi/ClassResolver.java
b/core/camel-api/src/main/java/org/apache/camel/spi/ClassResolver.java
index c00ac92ebf6..f7748d7eb3e 100644
--- a/core/camel-api/src/main/java/org/apache/camel/spi/ClassResolver.java
+++ b/core/camel-api/src/main/java/org/apache/camel/spi/ClassResolver.java
@@ -26,6 +26,13 @@ import java.util.Enumeration;
*/
public interface ClassResolver {
+ /**
+ * Adds a custom class loader to use.
+ *
+ * @param classLoader a custom class loader
+ */
+ void addClassLoader(ClassLoader classLoader);
+
/**
* Resolves the given class by its name
*
diff --git
a/core/camel-base-engine/src/main/java/org/apache/camel/impl/engine/DefaultClassResolver.java
b/core/camel-base-engine/src/main/java/org/apache/camel/impl/engine/DefaultClassResolver.java
index eb7a032fdbc..14f4cc89ff5 100644
---
a/core/camel-base-engine/src/main/java/org/apache/camel/impl/engine/DefaultClassResolver.java
+++
b/core/camel-base-engine/src/main/java/org/apache/camel/impl/engine/DefaultClassResolver.java
@@ -19,6 +19,8 @@ package org.apache.camel.impl.engine;
import java.io.InputStream;
import java.net.URL;
import java.util.Enumeration;
+import java.util.LinkedHashSet;
+import java.util.Set;
import org.apache.camel.CamelContext;
import org.apache.camel.CamelContextAware;
@@ -31,6 +33,7 @@ import org.apache.camel.util.ObjectHelper;
*/
public class DefaultClassResolver implements ClassResolver, CamelContextAware {
+ private Set<ClassLoader> classLoaders;
private CamelContext camelContext;
public DefaultClassResolver() {
@@ -50,9 +53,27 @@ public class DefaultClassResolver implements ClassResolver,
CamelContextAware {
return camelContext;
}
+ @Override
+ public void addClassLoader(ClassLoader classLoader) {
+ if (classLoaders == null) {
+ classLoaders = new LinkedHashSet<>();
+ }
+ classLoaders.add(classLoader);
+ }
+
@Override
public Class<?> resolveClass(String name) {
- Class<?> answer = loadClass(name,
DefaultClassResolver.class.getClassLoader());
+ Class<?> answer;
+ if (classLoaders != null) {
+ for (ClassLoader loader : classLoaders) {
+ answer = loadClass(name, loader);
+ if (answer != null) {
+ return answer;
+ }
+ }
+ }
+
+ answer = loadClass(name, DefaultClassResolver.class.getClassLoader());
if (answer == null && getApplicationContextClassLoader() != null) {
// fallback and use application context class loader
answer = loadClass(name, getApplicationContextClassLoader());
@@ -62,12 +83,7 @@ public class DefaultClassResolver implements ClassResolver,
CamelContextAware {
@Override
public <T> Class<T> resolveClass(String name, Class<T> type) {
- Class<T> answer = CastUtils.cast(loadClass(name,
DefaultClassResolver.class.getClassLoader()));
- if (answer == null && getApplicationContextClassLoader() != null) {
- // fallback and use application context class loader
- answer = CastUtils.cast(loadClass(name,
getApplicationContextClassLoader()));
- }
- return answer;
+ return CastUtils.cast(resolveClass(name), type);
}
@Override
diff --git
a/dsl/camel-java-joor-dsl/src/main/java/org/apache/camel/dsl/java/joor/JavaJoorClassLoader.java
b/dsl/camel-java-joor-dsl/src/main/java/org/apache/camel/dsl/java/joor/JavaJoorClassLoader.java
new file mode 100644
index 00000000000..d9b8f630778
--- /dev/null
+++
b/dsl/camel-java-joor-dsl/src/main/java/org/apache/camel/dsl/java/joor/JavaJoorClassLoader.java
@@ -0,0 +1,45 @@
+/*
+ * 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.dsl.java.joor;
+
+import org.apache.camel.CamelContext;
+import org.apache.camel.spi.CompilePostProcessor;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class JavaJoorClassLoader extends ClassLoader implements
CompilePostProcessor {
+
+ private final Map<String, Class<?>> classes = new HashMap<>();
+
+ public JavaJoorClassLoader() {
+ super(JavaJoorClassLoader.class.getClassLoader());
+ }
+
+ @Override
+ protected Class<?> findClass(String name) throws ClassNotFoundException {
+ return classes.get(name);
+ }
+
+ @Override
+ public void postCompile(CamelContext camelContext, String name, Class<?>
clazz, byte[] byteCode, Object instance) throws Exception {
+ if (name != null && clazz != null) {
+ classes.put(name, clazz);
+ }
+ }
+
+}
diff --git
a/dsl/camel-java-joor-dsl/src/main/java/org/apache/camel/dsl/java/joor/JavaRoutesBuilderLoader.java
b/dsl/camel-java-joor-dsl/src/main/java/org/apache/camel/dsl/java/joor/JavaRoutesBuilderLoader.java
index 413f7ec1759..970612f5fb0 100644
---
a/dsl/camel-java-joor-dsl/src/main/java/org/apache/camel/dsl/java/joor/JavaRoutesBuilderLoader.java
+++
b/dsl/camel-java-joor-dsl/src/main/java/org/apache/camel/dsl/java/joor/JavaRoutesBuilderLoader.java
@@ -30,6 +30,7 @@ import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
+import org.apache.camel.CamelContext;
import org.apache.camel.CamelContextAware;
import org.apache.camel.ExtendedCamelContext;
import org.apache.camel.RoutesBuilder;
@@ -64,6 +65,19 @@ public class JavaRoutesBuilderLoader extends
ExtendedRouteBuilderLoaderSupport {
super(EXTENSION);
}
+ @Override
+ protected void doBuild() throws Exception {
+ super.doBuild();
+
+ // register joor classloader to camel so we are able to load classes
we have compiled
+ CamelContext context = getCamelContext();
+ if (context != null) {
+ JavaJoorClassLoader cl = new JavaJoorClassLoader();
+ context.getClassResolver().addClassLoader(cl);
+ addCompilePostProcessor(cl);
+ }
+ }
+
@Override
protected RouteBuilder doLoadRouteBuilder(Resource resource) throws
Exception {
Collection<RoutesBuilder> answer =
doLoadRoutesBuilders(List.of(resource));
