Basic implementation for files app

web-container-registry/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <artifactId>nbs-cloud-aggregator</artifactId>
+        <groupId>de.77zzcx7.nbs-cloud</groupId>
+        <version>1-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>web-container-registry</artifactId>
+
+    <dependencies>
+        <!-- Spring -->
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+        </dependency>
+    </dependencies>
+</project>

web-container-registry/src/main/java/de/nbscloud/webcontainer/registry/App.java

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+package de.nbscloud.webcontainer.registry;
+
+public interface App {
+    // New app:
+    //  1) Create module
+    //  2) Add dependencies (like other app modules)
+    //  3) Register module in web-container module
+    //  4) Add module to dependency management in aggregator pom
+    //  5) Add module package to web-container application @ComponentScan
+
+    String getId();
+
+    String getIcon();
+
+    String getStartPath();
+
+    int getIndex();
+}

web-container-registry/src/main/java/de/nbscloud/webcontainer/registry/AppRegistry.java

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+package de.nbscloud.webcontainer.registry;
+
+import org.springframework.stereotype.Component;
+
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+@Component
+public class AppRegistry {
+    private final List<App> apps = new CopyOnWriteArrayList<>();
+
+    public void registerApp(App app) {
+        this.apps.add(app);
+
+        this.apps.sort(Comparator.comparing(App::getIndex));
+    }
+
+    public List<App> getAll() {
+        return Collections.unmodifiableList(this.apps);
+    }
+}