继“偶也研究OSGi了之一”之后不到12小时，偶又开始发博了，大家检查一下内容质量如何～
这次，在上次的示例基础上，展示一下MINI OSGi的一些基本特性。还是刚才的代码（有少许变化）：
PS：为了简化代码，省略了所有的注释，代码结构还算不错，一般可以看懂～
java 代码
- public class TFramework extends TestCase {
-
- private Framework framework;
-
- public void setUp() {
- framework = new Framework();
- framework.addFrameworkListener(new IFrameworkListener() {
- public void frameworkEvent(IFrameworkEvent event) {
- if (event.getType() != IFrameworkEvent.TYPE.DEBUG && event.getMessage() != null) {
- System.out.println(event.getMessage());
- }
- if (event.getThrowable() != null) {
- event.getThrowable().printStackTrace();
- }
- }
- });
- framework.addBundleListener(new ISynchronousBundleListener(){
- public void bundleChanged(IBundleEvent event) {
- IBundle bundle = event.getBundle();
- System.out.println("Bundle(SymbolicName:" + bundle.getSymbolicName() + ") state is changed to " + event.getType().name());
- }
-
- });
- }
-
- public void tearDown() {
- framework = null;
- }
-
- public void testBundle() throws Exception {
- framework.addClassPath("C:\\osgi\\lib");
- framework.addClassPath("C:\\osgi\\lib\\commons-logging.jar");
- IBundle[] bundle = framework.installBundles("C:\\osgi");
- bundle[0].start();
- }
- }
看到了吧，这里使用Bundle对象了～看看Bundle所对应的Activator类吧：
java 代码
- public class Activator implements IBundleActivator{
-
- public void start(IBundleContext context) throws Exception {
- System.out.println("Test.start(" + context + ")");
- }
-
- public void stop(IBundleContext context) throws Exception {
- System.out.println("Test.stop(" + context + ")");
- }
- }
"C:\osgi"目录下有一个叫 test.jar 的bundle包，MANIFEST.MF文件内容为：
Bundle-SymbolicName: com.yipsilon.osgi.test
Bundle-Version: 1.0.0.20061212
Bundle-NativeCode: swt-gdip-win32-3235.dll,swt-awt-win32-3235.dll,swt-wgl-win32-3235.dll,swt-win32-3235.dll
Bundle-Activator: com.yipsilon.osgi.test.Activator
Export-Package: com.yipsilon.osgi.test
Import-Package: org.apache.commons.logging
Bundle-ClassPath: swt.3.2.1.v3235.jar
其中 test.jar 的文件结构为：
test.jar
│ swt-awt-win32-3235.dll
│ swt-gdip-win32-3235.dll
│ swt-wgl-win32-3235.dll
│ swt-win32-3235.dll
│ swt.3.2.1.v3235.jar
│
├─com
│ └─yipsilon
│ └─osgi
│ ├─test
│ │ Activator.java
│ │ Test.java
│ │
│ └─test1
│ ApplicationWindow.java
│ Hello.java
│
└─META-INF
MANIFEST.MF
使用JUnit3运行TFramework后，后台打印出：
01. Bundle(SymbolicName:com.yipsilon.osgi.test) state is changed to INSTALLED
02. Bundle(SymbolicName:com.yipsilon.osgi.test) state is changed to RESOLVED
03. Bundle(SymbolicName:com.yipsilon.osgi.test) state is changed to STARTING
04. Test.start(com.yipsilon.osgi.BundleContext@14a9972)
05. Bundle(SymbolicName:com.yipsilon.osgi.test) state is changed to STARTED
06. Bundle(SymbolicName:com.yipsilon.osgi.test) state is changed to STOPPING
07. Test.stop(com.yipsilon.osgi.BundleContext@14a9972)
08. Bundle(SymbolicName:com.yipsilon.osgi.test) state is changed to STOPPED
09. Bundle(SymbolicName:com.yipsilon.osgi.test) state is changed to UNINSTALLED
目前，MINI OSGI已经实现了import-package和require-bundle的resolve检查（也就是输出第2行的执行结果）。
我使用了addShutdownHook来在系统退出时释放所有没有卸载的bundle资源，以防止内存泄漏（第6－9行就是自动释放的输出）。
目前Module Layer部分还没有完全实现MANIFEST属性条件的判断，我觉得那个东西太复杂，大多数情况也用不上（至少以我现在的项目来说），所以先搁置一下。其他重要的功能就剩下update()方法了。HOHO～～
