Bael 728 introduction to osgi (#3004)
* BAEL-728: first working geocoder example * First steps with different geocoder * Working plaing app * Small step * Maven project subdivided into components. * <Export-Package> added * CLient * small step fwd * Committing before resetting idea * It does not compile! * some other mod * Works * step * Examples works * removed unused code
This commit is contained in:
Daniele Demichelis
Grzegorz Piwowarek
parent
c6e7203f99
commit
fa589fa7bf
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<!-- com.baeldung/osgi-intro-sample-activator/1.0-SNAPSHOT -->
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<parent>
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<artifactId>osgi-intro</artifactId>
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<groupId>com.baeldung</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<!-- Please, note this is not the usual 'jar'. -->
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<packaging>bundle</packaging>
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<artifactId>osgi-intro-sample-activator</artifactId>
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<dependencies>
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<dependency>
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<groupId>org.osgi</groupId>
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<artifactId>org.osgi.core</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.felix</groupId>
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<artifactId>maven-bundle-plugin</artifactId>
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<extensions>true</extensions>
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<configuration>
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<instructions>
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<Bundle-SymbolicName>${project.groupId}.${project.artifactId}</Bundle-SymbolicName>
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<Bundle-Name>${project.artifactId}</Bundle-Name>
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<Bundle-Version>${project.version}</Bundle-Version>
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<!-- Qualified name of the class that exposes the activator iface. -->
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<Bundle-Activator>com.baeldung.osgi.sample.activator.HelloWorld</Bundle-Activator>
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<!-- One important thing to note:
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since you are not exporting the package "com.baeldung.osgi.sample.activator",
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you should at least add it to the Private-Package instruction.
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Otherwise, the classes inside the package will not be copied to your bundle,
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as the default value of this instruction is empty. -->
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<Private-Package>com.baeldung.osgi.sample.activator</Private-Package>
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</instructions>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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@ -0,0 +1,16 @@
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package com.baeldung.osgi.sample.activator;
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import org.osgi.framework.BundleActivator;
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import org.osgi.framework.BundleContext;
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public class HelloWorld implements BundleActivator {
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public void start(BundleContext ctx) {
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System.out.println("Hello World.");
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}
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public void stop(BundleContext bundleContext) {
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System.out.println("Goodbye World.");
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>osgi-intro</artifactId>
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<groupId>com.baeldung</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<!-- mvn:com.baeldung/osgi-intro-sample-client/1.0-SNAPSHOT -->
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<artifactId>osgi-intro-sample-client</artifactId>
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<packaging>bundle</packaging>
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<dependencies>
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<dependency>
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<groupId>com.baeldung</groupId>
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<artifactId>osgi-intro-sample-service</artifactId>
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<version>1.0-SNAPSHOT</version>
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</dependency>
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<dependency>
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<groupId>org.osgi</groupId>
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<artifactId>org.osgi.core</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.felix</groupId>
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<artifactId>maven-bundle-plugin</artifactId>
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<configuration>
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<instructions>
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<Bundle-SymbolicName>${project.groupId}.${project.artifactId}</Bundle-SymbolicName>
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<Bundle-Name>${project.artifactId}</Bundle-Name>
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<Bundle-Version>${project.version}</Bundle-Version>
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<Bundle-Activator>com.baeldung.osgi.sample.client.Client</Bundle-Activator>
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<Private-Package>com.baeldung.osgi.sample.client</Private-Package>
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</instructions>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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package com.baeldung.osgi.sample.client;
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import com.baeldung.osgi.sample.service.definition.Greeter;
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import org.osgi.framework.*;
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public class Client implements BundleActivator, ServiceListener {
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private BundleContext ctx;
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private ServiceReference serviceReference;
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public void start(BundleContext ctx) {
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this.ctx = ctx;
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try {
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ctx.addServiceListener(this, "(objectclass=" + Greeter.class.getName() + ")");
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} catch (InvalidSyntaxException ise) {
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ise.printStackTrace();
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}
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}
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public void stop(BundleContext bundleContext) {
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if (serviceReference != null) {
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ctx.ungetService(serviceReference);
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}
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this.ctx = null;
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}
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public void serviceChanged(ServiceEvent serviceEvent) {
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int type = serviceEvent.getType();
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switch (type) {
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case (ServiceEvent.REGISTERED):
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System.out.println("Notification of service registered.");
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serviceReference = serviceEvent.getServiceReference();
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Greeter service = (Greeter) (ctx.getService(serviceReference));
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System.out.println(service.sayHiTo("John"));
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break;
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case (ServiceEvent.UNREGISTERING):
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System.out.println("Notification of service unregistered.");
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ctx.ungetService(serviceEvent.getServiceReference());
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break;
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default:
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break;
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}
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}
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}
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@ -0,0 +1,46 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<!-- mvn:com.baeldung/osgi-intro-sample-service/1.0-SNAPSHOT -->
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<parent>
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<artifactId>osgi-intro</artifactId>
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<groupId>com.baeldung</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>osgi-intro-sample-service</artifactId>
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<!-- Please, note this is not the usual 'jar'. -->
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<packaging>bundle</packaging>
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<dependencies>
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<dependency>
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<groupId>org.osgi</groupId>
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<artifactId>org.osgi.core</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.felix</groupId>
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<artifactId>maven-bundle-plugin</artifactId>
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<extensions>true</extensions>
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<configuration>
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<instructions>
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<Bundle-SymbolicName>${project.groupId}.${project.artifactId}</Bundle-SymbolicName>
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<Bundle-Name>${project.artifactId}</Bundle-Name>
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<Bundle-Version>${project.version}</Bundle-Version>
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<Bundle-Activator>com.baeldung.osgi.sample.service.implementation.GreeterImpl</Bundle-Activator>
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<Private-Package>com.baeldung.osgi.sample.service.implementation</Private-Package>
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<Export-Package>com.baeldung.osgi.sample.service.definition</Export-Package>
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</instructions>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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@ -0,0 +1,7 @@
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package com.baeldung.osgi.sample.service.definition;
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public interface Greeter {
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public String sayHiTo(String name);
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}
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package com.baeldung.osgi.sample.service.implementation;
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import com.baeldung.osgi.sample.service.definition.Greeter;
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import org.osgi.framework.BundleActivator;
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import org.osgi.framework.BundleContext;
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import org.osgi.framework.ServiceReference;
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import org.osgi.framework.ServiceRegistration;
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import java.util.Hashtable;
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public class GreeterImpl implements Greeter, BundleActivator {
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private ServiceReference<Greeter> reference;
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private ServiceRegistration<Greeter> registration;
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@Override public String sayHiTo(String name) {
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return "Hello " + name;
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}
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@Override public void start(BundleContext context) throws Exception {
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System.out.println("Registering service.");
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registration = context.registerService(Greeter.class, new GreeterImpl(), new Hashtable<String, String>());
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reference = registration.getReference();
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}
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@Override public void stop(BundleContext context) throws Exception {
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System.out.println("Unregistering service.");
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registration.unregister();
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>osgi-intro</artifactId>
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<packaging>pom</packaging>
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<version>1.0-SNAPSHOT</version>
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<modules>
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<module>osgi-intro-sample-activator</module>
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<module>osgi-intro-sample-service</module>
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<module>osgi-intro-sample-client</module>
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</modules>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<relativePath>../..</relativePath>
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</parent>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>${project.groupId}</groupId>
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<artifactId>osgi-intro-client</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>${project.groupId}</groupId>
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<artifactId>osgi-intro-service</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>${project.groupId}</groupId>
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<artifactId>osgi-intro-gxyz</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>${project.groupId}</groupId>
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<artifactId>osgi-intro-mapquest</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>com.squareup.okhttp3</groupId>
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<artifactId>okhttp</artifactId>
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<version>3.9.0</version>
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</dependency>
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<dependency>
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<groupId>javax.json</groupId>
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<artifactId>javax.json-api</artifactId>
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<version>1.1</version>
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</dependency>
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<dependency>
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<groupId>org.glassfish</groupId>
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<artifactId>javax.json</artifactId>
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<version>1.1</version>
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</dependency>
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<dependency>
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<groupId>org.osgi</groupId>
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<artifactId>org.osgi.core</artifactId>
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<version>5.0.0</version>
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<scope>provided</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<build>
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<pluginManagement>
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<plugins>
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<plugin>
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<groupId>org.apache.felix</groupId>
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<artifactId>maven-bundle-plugin</artifactId>
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<version>1.4.0</version>
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<extensions>true</extensions>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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</project>
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@ -0,0 +1,91 @@
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OSGi
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====
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Info
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---
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com.baeldung.osgi
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com.baeldung.osgi.sample.activator
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Apache Felix
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---
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### Start
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Download Apache Felix Framework Distribution
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from <https://felix.apache.org/downloads.cgi>
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org.apache.felix.main.distribution-5.6.8
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No! The Apache Karaf container is best.
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Download it from: <https://karaf.apache.org/download.html>
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Download a binary distribution and unzip wherever you prefer.
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Then run
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bin\karaf.bat start
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Unzip, pay attention to the files not being clipped(!).
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system:exit
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exit!
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shutdown -h
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or `^D`
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### clean start
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full clean, remove "data directory "
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or...
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bin\karaf.bat clean
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bin\start.bat clean
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### run mode
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can be launched in
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- the "regular" mode starts Apache Karaf in foreground, including the shell console.
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- the "server" mode starts Apache Karaf in foreground, without the shell console.
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- the "background" mode starts Apache Karaf in background.
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### Logging
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https://karaf.apache.org/manual/latest/#_log
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can be logged to console
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### Bundle deploy
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bundle:install mvn:com.baeldung/osgi-intro-sample-activator/1.0-SNAPSHOT
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install mvn:com.baeldung/osgi-intro-sample-service/1.0-SNAPSHOT
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install mvn:com.baeldung/osgi-intro-sample-client/1.0-SNAPSHOT
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Eclipse's Equinox
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====
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Eclipse's OSGi platform
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http://www.eclipse.org/equinox/
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http://www.eclipse.org/equinox/documents/quickstart-framework.php
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click on "download"
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Latest Release
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Oxygen.1 Wed, 6 Sep 2017 -- 17:00 (-0400)
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org.eclipse.osgi_3.12.1.v20170821-1548.jar
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= = NOT GOOD = =
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Reference in New Issue