feature: support multiple application on single server

docs/asciidoc/problem-details.adoc

@@ -1,4 +1,4 @@
-== Problem Details
+=== Problem Details
 
 Most APIs have a way to report problems and errors, helping the user understand when something went wrong and what the issue is.
 The method used depends on the API’s style, technology, and design.
@@ -12,7 +12,7 @@ If it suits the API’s needs, using this standard benefits both designers and u
 
 `Jooby` provides built-in support for `Problem Details`.
 
-=== Set up ProblemDetails
+==== Set up ProblemDetails
 
 To enable the `ProblemDetails`, simply add the following line to your configuration:
 
@@ -44,11 +44,11 @@ problem.details {
 <3> You can optionally mute some exceptions logging completely.
 
 
-=== Creating problems
+==== Creating problems
 
 `HttpProblem` class represents the `RFC 7807` model. It is the main entity you need to work with to produce the problem.
 
-==== Static helpers
+===== Static helpers
 
 There are several handy static methods to produce a simple `HttpProblem`:
 
@@ -111,7 +111,7 @@ Resulting response:
 }
 ----
 
-==== Builder
+===== Builder
 
 Use builder to create a rich problem instance with all properties:
 
@@ -126,7 +126,7 @@ throw HttpProblem.builder()
   .build();
 ----
 
-=== Adding extra parameters
+==== Adding extra parameters
 
 `RFC 7807` has a simple extension model: APIs are free to add any other properties to the problem details object, so all properties other than the five ones listed above are extensions.
 
@@ -163,7 +163,7 @@ Resulting response:
 }
 ----
 
-=== Adding headers
+==== Adding headers
 
 Some `HTTP` codes (like `413` or `426`) require additional response headers, or it may be required by third-party system/integration. `HttpProblem` support additional headers in response:
 
@@ -177,7 +177,7 @@ throw HttpProblem.builder()
   .build();
 ----
 
-=== Respond with errors details
+==== Respond with errors details
 
 `RFC 9457` finally described how errors should be delivered in HTTP APIs.
 It is basically another extension `errors` on a root level. Adding errors is straight-forward using `error()` or `errors()` for bulk addition in builder:
@@ -214,7 +214,7 @@ In response:
 If you need to enrich errors with more information feel free to extend `HttpProblem.Error` and make your custom errors model.
 ====
 
-=== Custom `Exception` to `HttpProblem`
+==== Custom `Exception` to `HttpProblem`
 
 Apparently, you may already have many custom `Exception` classes in the codebase, and you want to make them `Problem Details` compliant without complete re-write. You can achieve this by implementing `HttpProblemMappable` interface. It allows you to control how exceptions should be transformed into `HttpProblem` if default behaviour doesn't suite your needs:
 
@@ -233,7 +233,7 @@ public class MyException implements HttpProblemMappable {
 }
 ----
 
-=== Custom Problems
+==== Custom Problems
 
 Extending `HttpProblem` and utilizing builder functionality makes it really easy:
 
@@ -255,7 +255,7 @@ public class OutOfStockProblem extends HttpProblem {
 }
 ----
 
-=== Custom Exception Handlers
+==== Custom Exception Handlers
 
 All the features described above should give you ability to rely solely on built-in global error handler. But, in case you still need custom exception handler for some reason, you still can do it:
 

docs/asciidoc/routing.adoc

@@ -1362,6 +1362,56 @@ Output:
 
 Done {love}!
 
+=== Multiple routers
+
+This model let you `run` multiple applications on single server instance. Each application
+works like a standalone application, they don't share any kind of services.
+
+.Multiple routers
+[source, java,role="primary"]
+----
+public class Foo extends Jooby {
+  {
+    setContextPath("/foo");
+    get("/hello", ctx -> ...);
+  }
+}
+
+public class Bar extends Jooby {
+  {
+    setContextPath("/bar");
+    get("/hello", ctx -> ...);
+  }
+}
+
+import static io.jooby.Jooby.runApp;
+
+public class MultiApp {
+  public static void main(String[] args) {
+    runApp(args, List.of(Foo::new, Bar::new));
+  }
+}
+----
+
+.Kotlin
+[source, kotlin,role="secondary"]
+----
+
+import io.jooby.kt.Kooby.runApp
+
+fun main(args: Array<String>) {
+  runApp(args, ::Foo, ::Bar)
+}
+----
+
+You write your application as always and them you deploy them using the `runApp` method.
+
+[IMPORTANT]
+====
+Due to nature of logging framework (static loading and initialization) the logging bootstrap
+might not work as you expected. It is recommend to use just the `logback.xml` or `log4j.xml` file.
+====
+
 === Options
 
 include::router-hidden-method.adoc[]

docs/pom.xml

@@ -11,7 +11,7 @@
 
   <properties>
     <application.class>io.jooby.adoc.DocApp</application.class>
-    <jooby.version>3.2.0</jooby.version>
+    <jooby.version>3.7.0</jooby.version>
     <maven.compiler.source>17</maven.compiler.source>
     <maven.compiler.target>17</maven.compiler.target>
     <maven.compiler.release>17</maven.compiler.release>
@@ -20,7 +20,7 @@
   <dependencies>
     <dependency>
       <groupId>io.jooby</groupId>
-      <artifactId>jooby-undertow</artifactId>
+      <artifactId>jooby-netty</artifactId>
       <version>${jooby.version}</version>
     </dependency>
 
@@ -51,7 +51,7 @@
     <dependency>
       <groupId>org.asciidoctor</groupId>
       <artifactId>asciidoctorj</artifactId>
-      <version>2.5.7</version>
+      <version>3.0.0</version>
     </dependency>
 
     <dependency>
@@ -63,7 +63,7 @@
     <dependency>
       <groupId>io.methvin</groupId>
       <artifactId>directory-watcher</artifactId>
-      <version>0.18.0</version>
+      <version>0.19.0</version>
     </dependency>
 
     <!-- zt-exec -->

docs/src/main/java/io/jooby/adoc/DocGenerator.java

@@ -251,30 +251,30 @@ private static void processModule(
 
   private static Options createOptions(Path basedir, Path outdir, String version, String title)
       throws IOException {
-    Attributes attributes = new Attributes();
+    var attributes = Attributes.builder();
 
-    attributes.setAttribute("love", "♡");
-    attributes.setAttribute("docinfo", "shared");
-    attributes.setTitle(title == null ? "jooby: do more! more easily!!" : "jooby: " + title);
-    attributes.setTableOfContents(Placement.LEFT);
-    attributes.setAttribute("toclevels", "3");
+    attributes.attribute("love", "♡");
+    attributes.attribute("docinfo", "shared");
+    attributes.title(title == null ? "jooby: do more! more easily!!" : "jooby: " + title);
+    attributes.tableOfContents(Placement.LEFT);
+    attributes.attribute("toclevels", "3");
     attributes.setAnchors(true);
-    attributes.setAttribute("sectlinks", "");
-    attributes.setSectionNumbers(true);
-    attributes.setAttribute("sectnumlevels", "3");
-    attributes.setLinkAttrs(true);
-    attributes.setNoFooter(true);
-    attributes.setAttribute("idprefix", "");
-    attributes.setAttribute("idseparator", "-");
-    attributes.setIcons("font");
-    attributes.setAttribute("description", "The modular micro web framework for Java");
-    attributes.setAttribute(
+    attributes.attribute("sectlinks", "");
+    attributes.sectionNumbers(true);
+    attributes.attribute("sectnumlevels", "3");
+    attributes.linkAttrs(true);
+    attributes.noFooter(true);
+    attributes.attribute("idprefix", "");
+    attributes.attribute("idseparator", "-");
+    attributes.icons("font");
+    attributes.attribute("description", "The modular micro web framework for Java");
+    attributes.attribute(
         "keywords", "Java, Modern, Micro, Web, Framework, Reactive, Lightweight, Microservices");
-    attributes.setImagesDir("images");
-    attributes.setSourceHighlighter("highlightjs");
-    attributes.setAttribute("highlightjsdir", "js");
-    attributes.setAttribute("highlightjs-theme", "agate");
-    attributes.setAttribute("favicon", "images/favicon96.png");
+    attributes.imagesDir("images");
+    attributes.sourceHighlighter("highlightjs");
+    attributes.attribute("highlightjsdir", "js");
+    attributes.attribute("highlightjs-theme", "agate");
+    attributes.attribute("favicon", "images/favicon96.png");
 
     // versions:
     Document pom =
@@ -283,21 +283,20 @@ private static Options createOptions(Path basedir, Path outdir, String version,
           var tagName = tag.tagName();
           var value = tag.text().trim();
           Stream.of(tagName, tagName.replaceAll("[.-]", "_"), tagName.replaceAll("[.-]", "-"), toJavaName(tagName))
-                  .forEach(key -> attributes.setAttribute(key, value));
+                  .forEach(key -> attributes.attribute(key, value));
         });
 
-    attributes.setAttribute("joobyVersion", version);
-    attributes.setAttribute("date", DateTimeFormatter.ISO_INSTANT.format(Instant.now()));
+    attributes.attribute("joobyVersion", version);
+    attributes.attribute("date", DateTimeFormatter.ISO_INSTANT.format(Instant.now()));
 
     OptionsBuilder options = Options.builder();
     options.backend("html");
 
-    options.attributes(attributes);
+    options.attributes(attributes.build());
     options.baseDir(basedir.toAbsolutePath().toFile());
     options.docType("book");
     options.toDir(outdir.toFile());
     options.mkDirs(true);
-    options.destinationDir(outdir.resolve("site").toFile());
     options.safe(SafeMode.UNSAFE);
     return options.build();
   }

docs/src/main/java/io/jooby/adoc/JavadocProcessor.java

@@ -13,6 +13,8 @@
 import java.util.stream.Collectors;
 
 import org.asciidoctor.ast.ContentNode;
+import org.asciidoctor.ast.PhraseNode;
+import org.asciidoctor.ast.StructuralNode;
 import org.asciidoctor.extension.InlineMacroProcessor;
 
 public class JavadocProcessor extends InlineMacroProcessor {
@@ -22,8 +24,7 @@ public JavadocProcessor(String name) {
   }
 
   @Override
-  public Object process(ContentNode parent, String clazz, Map<String, Object> attributes) {
-
+  public PhraseNode process(StructuralNode parent, String clazz, Map<String, Object> attributes) {
     StringBuilder link =
         new StringBuilder("https://www.javadoc.io/doc/io.jooby/jooby/latest/io.jooby/io/jooby/");
     StringBuilder text = new StringBuilder();

jooby/src/main/java/io/jooby/Context.java

@@ -46,6 +46,47 @@
  */
 public interface Context extends Registry {
 
+  /** Select an application base on context path prefix matching a provided path. */
+  interface Selector {
+    /**
+     * Select an application base on context path prefix matching a provided path.
+     *
+     * @param applications List of applications.
+     * @param path Path to match.
+     * @return Best match application.
+     */
+    Jooby select(List<Jooby> applications, String path);
+
+    static Selector create(List<Jooby> applications) {
+      return applications.size() == 1 ? single() : multiple();
+    }
+
+    /**
+     * Select an application the best match a given path. If none matches it returns the application
+     * that has no context path <code>/</code> or the first of the list.
+     *
+     * @return Best match application.
+     */
+    static Selector multiple() {
+      return (applications, path) -> {
+        var defaultApp = applications.get(0);
+        for (var app : applications) {
+          var contextPath = app.getContextPath();
+          if ("/".equals(contextPath)) {
+            defaultApp = app;
+          } else if (path.startsWith(contextPath)) {
+            return app;
+          }
+        }
+        return defaultApp;
+      };
+    }
+
+    private static Selector single() {
+      return (applications, path) -> applications.get(0);
+    }
+  }
+
   /** Constant for default HTTP port. */
   int PORT = 80;