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OSG i 動態服務模組開發實作詹景逸 Ching Yi, Chan. aka qrtt1 [email_address]

Agenda 開發環境準備 JDK Maven Felix 練習主題介紹 Felix – OSGi Container 的使用 Bundle – 建立 OSGi 模組 Service – 建立 OSGi 服務

開發環境準備 JDK #2 Java SE http://java.sun.com/javase/downloads/index.jsp 檢查環境變數 JAVA_HOME CLASSPATH PATH

開發環境準備 Maven #3 取得檔案 http://maven.apache.org/download.html 解壓縮 ~/app c:\app 修改 PATH 變數 export PATH=$PATH:~/app/apache-maven- x.y.z /bin set PATH=%PATH%;c:\app\apache-maven- x.y.z \bin 執行測試 mvn -v

開發環境準備 Felix – OSGi Container #5 取得檔案 http://apache.stu.edu.tw/felix/felix-1.4.1.zip 解壓縮 ~/app c:\app 啟動 Felix java -jar bin/felix.jar 停止 Felix stop 0 或是 shutdown

Felix 基本操作啟動 Felix #6 java -jar bin/felix.jar 常用指令 help ps – 列出已安裝 Bundle install – 安裝 Bundle start – 啟動 Bundle stop – 停止 Bundle update – 更新 Bundle uninstall – 移除 Bundle ( 請先別執行 ) shutdown – 離開 felix

安裝 Bundle File Install Bundle #7 功能：在 Felix 執行目錄下建立 load 資料夾。定期監看 load 資料夾的檔案，若是 OSGi Bundle 就自動安裝。使用 Install 指令安裝 Bundle 透過網路檔案安裝透過檔案系統安裝測試 File Install Bundle ( 需先啟動 Bundle) 複製 hello.service-1.0.0.jar 至 load 資料夾 install http:// apache.ntu.edu.tw/felix/org.apache.felix.fileinstall-0.9.0.jar install file:// /c:/temp /org.apache.felix.fileinstall-0.9.0.jar install file:// /home/qrtt1/temp/ org.apache.felix.fileinstall-0.9.0.jar

建立 Bundle 使用 Maven 建立新的專案 #9 for unix-like for windows mvn archetype:create \ -Dversion=1.0.0 \ -DgroupId=javatwo2009 \ -DartifactId=hello.bundle mvn archetype:create ^ -Dversion=1.0.0 ^ -DgroupId=javatwo2009 ^ -DartifactId=hello.bundle

Maven 專案導覽專案目錄 #9 Artifact 名稱 hello.bundle 編譯並打包專案 ( 請先執行這個步驟 ) cd hello.bundle mvn clean package

使用 Maven-Bundle-Plugin (1) 修改 pom.xml 檔案 #10 改變 <packaging /> 為 bundle 增加 OSGi Framework 的 Dependency 設定 Maven-Bundle-Plugin ( 接續下頁 ) <dependency> <groupId>org.apache.felix</groupId> <artifactId>org.osgi.core</artifactId> <version>1.0.0</version> </dependency>

使用 Maven-Bundle-Plugin (2) <build> <plugins> <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-bundle-plugin</artifactId> <extensions>true</extensions> <configuration> <instructions> <Export-Package>${pom.groupId}</Export-Package> <Bundle-SymbolicName>${pom.artifactId}</Bundle-SymbolicName> <Bundle-Activator>${pom.groupId}.Activator</Bundle-Activator> </instructions> </configuration> </plugin> </plugins> </build> Manifest-Version: 1.0 Export-Package: javatwo2009;uses:="org.osgi.framework" Built-By: Administrator Tool: Bnd-0.0.308 Bundle-Name: hello.bundle Created-By: Apache Maven Bundle Plugin Bundle-Version: 1.0.0 Build-Jdk: 1.6.0_06 Bnd-LastModified: 1235833008625 Bundle-ManifestVersion: 2 Bundle-Activator: javatwo2009.Activator Import-Package: javatwo2009,org.osgi.framework;version="1.3" Bundle-SymbolicName: hello.bundle

建立 Bundle Activator package javatwo2009; import org.osgi.framework.BundleActivator; import org.osgi.framework.BundleContext; /** * Hello world! */ public class Activator implements BundleActivator { public void start(BundleContext context) throws Exception { System. out .println("Hey!"); } public void stop(BundleContext context) throws Exception { System. out .println("Bye!"); } } #12 .. #13

編譯與安裝 bundle 使用 Maven 編譯並打包專案 #14 mvn clean package 安裝 bundle 將 target/hello.bundle-1.0.0.jar 複製到 FELIX_HOME/load 資料夾

OSGi 怎麼跑？ System Bundle B B B PID 永遠為 0 JVM OSGi Framework Module Life Cycle Service

OSGi 怎麼跑？ Installed Resolving & Loading Classes Resolved JVM OSGi Framework System Bundle M O D U L E Export-Package: org.osgi.framework, org.osgi.framework.hooks.service, org.osgi.service.packageadmin, org.osgi.service.startlevel, org.osgi.service.url, org.osgi.util.tracker

OSGi 怎麼跑？ Resolved public class Activator implements BundleActivator { public void start(BundleContext context) throws Exception { System. out .println("Hey!"); } public void stop(BundleContext context) throws Exception { System. out .println("Bye!"); } } JVM OSGi Framework System Bundle L I F E C Y C L E Starting Active Stopping Activator.stop() Activator.start()

PART 2 Service is Everything

OSGi Service 在哪裡？ JVM OSGi Framework SERVICE REGISTRY Bundle Activator Bundle Activator Bundle Activator publish publish publish find & bind find & bind find & bind unpublish unpublish unpublish

服務與實作角色 (1) Service Provider Interface ， SPI #16 Export-Package Bundle Activator

服務與實作角色 (2) Application Programming Interface ， API Import-Package Bundle Activator

服務與實作角色 (3) Service Provider Import-Package ServiceRegistration registration = bundleContext. registerService ( ServiceA .class.getName(), new ConcreteServiceA() , prop); Bundle Activator

服務與實作角色 (4) Service Consumer Import-Package ServiceReference ref = bundleContext . getServiceReference ( ServiceA .class.getName()); ServiceA service = (ServiceA) bundleContext.getService(ref); Bundle Activator

實作 TinyURL Command(1) 擴充 Felix Shell 指令 Apache Felix Shell Service Activator Apache Felix Shell TUI Activator Tinyurl Command Activator

實作 TinyURL Command(2) org.apache.felix.shell Export-Package Import-Package // 發佈 Service bundleContext.registerService( org.apache.felix.shell. Command .class.getName(), new TinyURLCommand (), null); Apache Felix Shell Service Activator Apache Felix Shell TUI Activator Tinyurl Command Activator 實作 Service

實作 TinyURL Command(3) publish publish 追蹤 Command 服務加入新增的 Command 服務使用 ShellService 擁有的 Command Apache Felix Shell Service Activator Apache Felix Shell TUI Activator Tinyurl Command Activator

動手做看看實作 TinyurlCommand 替 Felix 增加指令 See TODO 2 & #17..#21 tinyurl http://very_long_url.com.tw

詹景逸 Ching Yi, Chan. aka qrtt1 [email_address] Thank You

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