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commit 61599974aab12041971869e258ca0f03803bf211
Author: Claus Ibsen <claus.ib...@gmail.com>
AuthorDate: Thu Feb 4 13:16:41 2021 +0100
CAMEL-16102: Source code generate @InvokeOnHeader for reflection free
---
.../apache/camel/spi/InvokeOnHeaderStrategy.java | 37 ++++
.../maven/packaging/GenerateComponentMojo.java | 2 +
.../packaging/GenerateInvokeOnHeaderMojo.java | 215 +++++++++++++++++++++
3 files changed, 254 insertions(+)
diff --git
a/core/camel-api/src/main/java/org/apache/camel/spi/InvokeOnHeaderStrategy.java
b/core/camel-api/src/main/java/org/apache/camel/spi/InvokeOnHeaderStrategy.java
new file mode 100644
index 0000000..a9cce8d
--- /dev/null
+++
b/core/camel-api/src/main/java/org/apache/camel/spi/InvokeOnHeaderStrategy.java
@@ -0,0 +1,37 @@
+/*
+ * 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.spi;
+
+import org.apache.camel.Exchange;
+
+/**
+ * Pluggable strategy for invoking {@link InvokeOnHeader} or {@link
InvokeOnHeaders}.
+ * <p>
+ * Camel provides source code generated strategies via the camel maven tooling.
+ */
+public interface InvokeOnHeaderStrategy {
+
+ /**
+ * Invoke the method based on the header key
+ *
+ * @param key the header key
+ * @param exchange the exchange
+ * @return option response from invoking the method, or <tt>null</tt> if
the method is void
+ * @throws Exception is thrown if error invoking the method.
+ */
+ Object invoke(String key, Exchange exchange) throws Exception;
+}
diff --git
a/tooling/maven/camel-package-maven-plugin/src/main/java/org/apache/camel/maven/packaging/GenerateComponentMojo.java
b/tooling/maven/camel-package-maven-plugin/src/main/java/org/apache/camel/maven/packaging/GenerateComponentMojo.java
index b5b1911..765b078 100644
---
a/tooling/maven/camel-package-maven-plugin/src/main/java/org/apache/camel/maven/packaging/GenerateComponentMojo.java
+++
b/tooling/maven/camel-package-maven-plugin/src/main/java/org/apache/camel/maven/packaging/GenerateComponentMojo.java
@@ -46,6 +46,8 @@ public class GenerateComponentMojo extends
AbstractGenerateMojo {
invoke(EndpointSchemaGeneratorMojo.class);
// generate endpoint-uri-factory
invoke(GenerateEndpointUriFactoryMojo.class);
+ // generate invoke-on-header
+ invoke(GenerateInvokeOnHeaderMojo.class);
// prepare-components
invoke(PrepareComponentMojo.class);
// validate-components
diff --git
a/tooling/maven/camel-package-maven-plugin/src/main/java/org/apache/camel/maven/packaging/GenerateInvokeOnHeaderMojo.java
b/tooling/maven/camel-package-maven-plugin/src/main/java/org/apache/camel/maven/packaging/GenerateInvokeOnHeaderMojo.java
new file mode 100644
index 0000000..d44da3e
--- /dev/null
+++
b/tooling/maven/camel-package-maven-plugin/src/main/java/org/apache/camel/maven/packaging/GenerateInvokeOnHeaderMojo.java
@@ -0,0 +1,215 @@
+/*
+ * 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.maven.packaging;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringWriter;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugin.MojoFailureException;
+import org.apache.maven.plugins.annotations.LifecyclePhase;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+import org.apache.maven.plugins.annotations.ResolutionScope;
+import org.jboss.jandex.AnnotationInstance;
+import org.jboss.jandex.DotName;
+import org.jboss.jandex.Index;
+import org.jboss.jandex.IndexReader;
+
+/**
+ * Abstract class for @InvokeOnHeader/@InvokeOnHeaders factory generator.
+ */
+@Mojo(name = "generate-invoke-on-header", threadSafe = true, defaultPhase =
LifecyclePhase.PROCESS_CLASSES,
+ requiresDependencyCollection = ResolutionScope.COMPILE,
+ requiresDependencyResolution = ResolutionScope.COMPILE)
+public class GenerateInvokeOnHeaderMojo extends AbstractGeneratorMojo {
+
+ public static final DotName HEADER_ANNOTATION =
DotName.createSimple("org.apache.camel.spi.InvokeOnHeader");
+ public static final DotName HEADERS_ANNOTATION =
DotName.createSimple("org.apache.camel.spi.InvokeOnHeaders");
+
+ /**
+ * The project build directory
+ */
+ @Parameter(defaultValue = "${project.build.directory}")
+ protected File buildDir;
+
+ @Parameter(defaultValue = "${project.basedir}/src/generated/java")
+ protected File sourcesOutputDir;
+ @Parameter(defaultValue = "${project.basedir}/src/generated/resources")
+ protected File resourcesOutputDir;
+
+ private static class InvokeOnHeaderModel {
+ private String key;
+ private String methodName;
+
+ public String getKey() {
+ return key;
+ }
+
+ public void setKey(String key) {
+ this.key = key;
+ }
+
+ public String getMethodName() {
+ return methodName;
+ }
+
+ public void setMethodName(String methodName) {
+ this.methodName = methodName;
+ }
+ }
+
+ public GenerateInvokeOnHeaderMojo() {
+ }
+
+ @Override
+ public void execute() throws MojoExecutionException, MojoFailureException {
+ if ("pom".equals(project.getPackaging())) {
+ return;
+ }
+
+ buildDir = new File(project.getBuild().getDirectory());
+
+ if (sourcesOutputDir == null) {
+ sourcesOutputDir = new File(project.getBasedir(),
"src/generated/java");
+ }
+ if (resourcesOutputDir == null) {
+ resourcesOutputDir = new File(project.getBasedir(),
"src/generated/resources");
+ }
+
+ Path output = Paths.get(project.getBuild().getOutputDirectory());
+ Index index;
+ try (InputStream is =
Files.newInputStream(output.resolve("META-INF/jandex.idx"))) {
+ index = new IndexReader(is).read();
+ } catch (IOException e) {
+ throw new MojoExecutionException("IOException: " + e.getMessage(),
e);
+ }
+
+ Map<String, Set<InvokeOnHeaderModel>> classes = new HashMap<>();
+ List<AnnotationInstance> annotations =
index.getAnnotations(HEADER_ANNOTATION);
+ annotations.forEach(a -> {
+ String currentClass = a.target().asClass().name().toString();
+ String value = a.value().asString();
+ String methodName = a.target().asMethod().name();
+ Set<InvokeOnHeaderModel> set = classes.get(currentClass);
+ if (set == null) {
+ set = new HashSet<>();
+ }
+ InvokeOnHeaderModel model = new InvokeOnHeaderModel();
+ model.key = value;
+ model.methodName = methodName;
+ set.add(model);
+ });
+
+ try {
+ for (Map.Entry<String, Set<InvokeOnHeaderModel>> entry :
classes.entrySet()) {
+ createInvokeOnHeaderFactory(entry.getKey(), entry.getValue());
+ }
+ } catch (IOException e) {
+ throw new MojoExecutionException("IOException: " + e.getMessage(),
e);
+ }
+ }
+
+ protected void createInvokeOnHeaderFactory(String fqn,
Set<InvokeOnHeaderModel> models) throws IOException {
+ generateInvokeOnHeaderFactory(fqn, models, sourcesOutputDir);
+ updateResource(resourcesOutputDir.toPath(),
+ "META-INF/services/org/apache/camel/invoke-on-header/" + fqn,
+ "# " + GENERATED_MSG + NL + "class=" + fqn + NL);
+ }
+
+ @Deprecated
+ private void generateInvokeOnHeaderFactory(
+ String fqn, Set<InvokeOnHeaderModel> models, File outputDir)
+ throws IOException {
+
+ int pos = fqn.lastIndexOf('.');
+ String pn = fqn.substring(0, pos);
+ String cn = fqn.substring(pos + 1) + "InvokeOnHeaderFactory";
+ String en = fqn;
+ String pfqn = fqn;
+ String psn =
"org.apache.camel.support.component.InvokeOnHeaderSupport";
+
+ StringWriter sw = new StringWriter();
+ generateInvokeOnHeaderSource(pn, cn, en, pfqn, psn, sw, models);
+
+ String source = sw.toString();
+
+ String fileName = pn.replace('.', '/') + "/" + cn + ".java";
+ outputDir.mkdirs();
+ boolean updated = updateResource(buildContext,
outputDir.toPath().resolve(fileName), source);
+ if (updated) {
+ getLog().info("Updated " + fileName);
+ }
+ }
+
+ private void generateInvokeOnHeaderSource(
+ String pn, String cn, String en, String pfqn, String psn,
StringWriter w, Set<InvokeOnHeaderModel> models) {
+ w.write("/* " + AbstractGeneratorMojo.GENERATED_MSG + " */\n");
+ w.write("package " + pn + ";\n");
+ w.write("\n");
+ w.write("import java.util.Map;\n");
+ w.write("\n");
+ w.write("import org.apache.camel.CamelContext;\n");
+ w.write("import org.apache.camel.spi.InvokeOnHeaderStrategy;\n");
+ w.write("import org.apache.camel.util.CaseInsensitiveMap;\n");
+ w.write("import " + pfqn + ";\n");
+ w.write("\n");
+ w.write("/**\n");
+ w.write(" * " + AbstractGeneratorMojo.GENERATED_MSG + "\n");
+ w.write(" */\n");
+ w.write("@SuppressWarnings(\"unchecked\")\n");
+ w.write("public class " + cn + " extends " + psn
+ + " implements InvokeOnHeaderStrategy");
+ w.write(" {\n");
+ w.write("\n");
+
+ // sort options A..Z so they always have same order
+ if (!models.isEmpty()) {
+ models =
models.stream().sorted(Comparator.comparing(InvokeOnHeaderModel::getKey)).collect(Collectors.toSet());
+ }
+
+ w.write(" @Override\n");
+ w.write(" public Object invoke(String key, Exchange exchange) {\n");
+ if (!models.isEmpty()) {
+ w.write(" switch (name) {\n");
+ for (InvokeOnHeaderModel option : models) {
+ String invoke = option.getMethodName() +
"(exchange.getMessage());";
+ if (!option.getKey().toLowerCase().equals(option.getKey())) {
+ w.write(String.format(" case \"%s\":\n",
option.getKey().toLowerCase()));
+ }
+ w.write(String.format(" case \"%s\": return %s;\n",
option.getKey(), invoke));
+ }
+ }
+ w.write(" }\n");
+
+ w.write("}\n");
+ w.write("\n");
+ }
+
+}
