osgi实战学习之路:3. osgi分层概念及相互合作demo

源码下载

分层:

modual:

主要作用于包级管理与共享代码

lifecycle:

主要作用于执行期间的模块管理与訪问osgi底层框架

service:

主要作用于多模块之间的相互通信

demo:

hello-provider/pom.xml

<?
xml version="1.0"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
	xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.demo</groupId>
		<artifactId>pom</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<artifactId>hello-provider</artifactId>
	<packaging>bundle</packaging>
	<name>hello-provider</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
		</dependency>
		<dependency>
			<groupId>org.osgi</groupId>
			<artifactId>org.osgi.core</artifactId>
		</dependency>
	</dependencies>
	<build>
			<plugins>
				<plugin>
					<groupId>org.apache.felix</groupId>
					<artifactId>maven-bundle-plugin</artifactId>
					<configuration>
						<instructions>
							<Export-Package>org.hello.provider</Export-Package>
							<Import-Package>org.osgi.framework</Import-Package>
							<Bundle-Activator>org.hello.provider.impl.UserServiceActivator</Bundle-Activator>
							<Private-Package>org.hello.*</Private-Package>
						</instructions>
					</configuration>
				</plugin>
			</plugins>
	</build>
</project>

hello-provider/BundleActivator:

package org.hello.provider.impl;

import org.hello.provider.IUserService;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;

public class UserServiceActivator implements BundleActivator {

	public void start(BundleContext context) throws Exception {
		System.out.println("registerService......");
		context.registerService(IUserService.class.getName(), 
				new UserService(), null);
	}

	public void stop(BundleContext context) throws Exception {

	}

}

hello-client/pom.xml:

<?xml version="1.0"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
	xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.demo</groupId>
		<artifactId>pom</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<artifactId>hello-client</artifactId>
	<packaging>bundle</packaging>
	<name>hello-client</name>
	<url>http://maven.apache.org</url>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
		</dependency>
		<dependency>
			<groupId>org.osgi</groupId>
			<artifactId>org.osgi.core</artifactId>
		</dependency>
		<dependency>
			<groupId>com.demo</groupId>
			<artifactId>hello-provider</artifactId>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.felix</groupId>
				<artifactId>maven-bundle-plugin</artifactId>
				<extensions>true</extensions>
				<configuration>
					<instructions>
						<Import-Package>org.hello.provider,
							org.osgi.framework						
						</Import-Package>
						<Bundle-Activator>org.hello.client.Client</Bundle-Activator>
						<Private-Package>com.demo.hello.*</Private-Package>
					</instructions>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

hello-client/BundleActivator:

package org.hello.client;

import org.hello.provider.IUserService;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;

public class Client implements BundleActivator {

	public void start(BundleContext context) throws Exception {
		ServiceReference 
		   reference=context.getServiceReference(IUserService.class.getName());
			System.out.println(((IUserService)context.getService(reference)).add());
	}

	public void stop(BundleContext context) throws Exception {

	}

}

将bundle安装到本地仓库且部署到karaf(參考前一篇)

启动bundle

通过下面命令查看bundle的id

list

通过下面命令,启动bundle

bundle:start 78

參考演示样例