Embedded OSGi Apache Felix

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         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>
+    <name>ASys Core</name>
+
+    <groupId>asys</groupId>
+    <artifactId>asys-core</artifactId>
+    <packaging>jar</packaging>
+    <version>0.0-SNAPSHOT</version>
+
+    <developers>
+        <developer>
+            <name>DmitriyMX</name>
+            <email>dimon550@gmail.com</email>
+        </developer>
+    </developers>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <java.version>1.8</java.version>
+        <slf4j.version>1.7.21</slf4j.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${slf4j.version}</version>
+        </dependency>
+		<dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>${slf4j.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.felix</groupId>
+            <artifactId>org.apache.felix.framework</artifactId>
+            <version>5.6.1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>21.0</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>${project.artifactId}-${project.version}</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                    <encoding>${project.build.sourceEncoding}</encoding>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.15</version>
+                <configuration>
+                    <argLine>-Dfile.encoding=${project.build.sourceEncoding}</argLine>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/asys/core/Core.java

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+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2017-03-02
+ */
+package asys.core;
+
+import org.apache.felix.framework.Felix;
+import org.apache.felix.framework.util.ImmutableList;
+import org.apache.felix.framework.util.ImmutableMap;
+import org.osgi.framework.BundleActivator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.apache.felix.framework.util.FelixConstants.SYSTEMBUNDLE_ACTIVATORS_PROP;
+
+public class Core {
+    private final Logger logger = LoggerFactory.getLogger(this.getClass());
+    private Felix felix;
+    private BundleActivator hostActivator;
+
+    public Core() {
+        logger.trace("core created");
+    }
+
+    @PostConstruct
+    public void start() {
+        hostActivator = new HostActivator();
+        startFelix();
+    }
+
+    private void startFelix() {
+        logger.trace("starting Apache Felix (OSGi)");
+
+        try {
+            felix = new Felix(createFelixConfig());
+            felix.start();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private Map<String, Object> createFelixConfig() {
+        Map<String, Object> config = new HashMap<>();
+
+        config.put(SYSTEMBUNDLE_ACTIVATORS_PROP, ImmutableList.newInstance(this.hostActivator));
+        config.put("felix.fileinstall.poll", 250);
+        config.put("felix.fileinstall.log.level", 2);
+        config.put("felix.fileinstall.noInitialDelay", true);
+
+        return ImmutableMap.newInstance(config);
+    }
+
+    @PreDestroy
+    public void stop() {
+        startFelix();
+    }
+
+    private void stopFelix() {
+        logger.trace("shutdown Apache Felix (OSGi)");
+
+        try {
+            felix.stop();
+            felix.waitForStop(5000L);
+        } catch (Exception e) {
+            logger.error("Error shutdown Felix", e);
+        }
+    }
+}

src/main/java/asys/core/HostActivator.java

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+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2017-03-02
+ */
+package asys.core;
+
+import org.osgi.framework.BundleActivator;
+import org.osgi.framework.BundleContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class HostActivator implements BundleActivator {
+    private final Logger logger = LoggerFactory.getLogger(this.getClass());
+
+    @Override
+    public void start(BundleContext bundleContext) throws Exception {
+        logger.trace("call [HostActivator.start(BundleContext)]");
+    }
+
+    @Override
+    public void stop(BundleContext bundleContext) throws Exception {
+        logger.trace("call [HostActivator.stop(BundleContext)]");
+    }
+}

src/main/java/asys/core/Main.java

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+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2017-03-02
+ */
+package asys.core;
+
+public class Main {
+    public static void main(String[] args) {
+        Core asysCore = new Core();
+        asysCore.start();
+    }
+}