osgi实战学习之路:5.生命周期及利用命令、装饰者模式实现基于socket交互Bundle命令demo

生命周期中关键3个类:

BundleActivator

入口点，类似main方法

BundleContext

Bundle上下文对象,在执行期间，为应用程序提供操作osgi框架的方法

Bundle

代表一个已安装的Bundle

接口说明:

BundleActivator:

public interface BundleActivator {
	public void start(BundleContext context) throws Exception;
	public void stop(BundleContext context) throws Exception;
}

BundleContext:

public interface BundleContext {
   ...
   String getProperty(String key);
   Bundle getBundle();
   Bundle installBundle(String location, InputStream input)
   throws BundleException;
   Bundle installBundle(String location) throws BundleException;
   Bundle getBundle(long id);
   Bundle[] getBundles();
   void addBundleListener(BundleListener listener);
   void removeBundleListener(BundleListener listener);
   void addFrameworkListener(FrameworkListener listener);
   void removeFrameworkListener(FrameworkListener listener);
   ...
}

Bundle:

...
BundleContext getBundleContext();
long getBundleId();
Dictionary getHeaders();
Dictionary getHeaders(String locale);
String getLocation();
int getState();
String getSymbolicName();
Version getVersion();
void start(int options) throws BundleException;
void start() throws BundleException;
void stop(int options) throws BundleException;
void stop() throws BundleException;
void update(InputStream input) throws BundleException;
void update() throws BundleException;
void uninstall() throws BundleException;

Bundle状态图:

源码下载

demo:

准备:

在karaf_home下新建config、logs目录

将my-shell下的server.properties拷贝到karaf_home/config下

增加log4j日志配置,參考

部署Bundle

bundle:install -s mvn:com.demo.shell/my-shell/1.0.0-SNAPSHOT

打开window命令行输入:

telnet localhost 7080

输入help，能够查看全部命令帮助

输入install命令，部署外部Bundle:

install http://localhost:9090/testweb/bundle/user-model-0.0.1-SNAPSHOT.jar

在karaf中输入list,能够查看已经部署的bundle id

在window命令行输入命令，启动bundle

start bundle_id

在karaf中输入list,查看已部署的Bundle处于Active状态