基于 OSGi 的面向服务的组件编程

                
package com.systemmanagement.services.monitor;

public interface MonitorService {
  public String getMonitorMessage();
}

                
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Services Plug-in
Bundle-SymbolicName: com.systemmanagement.services
Bundle-Version: 1.0.0
Bundle-Vendor: cyz
Bundle-Localization: plugin
Export-Package: com.systemmanagement.services.monitor
            
                
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Cpumonitor Plug-in
Bundle-SymbolicName: com.systemmanagement.cpumonitor
Bundle-Version: 1.0.0
Bundle-Activator: com.systemmanagement.cpumonitor.CpuMonitorActivator
Bundle-Vendor: cyz
Bundle-Localization: plugin
Import-Package: com.systemmanagement.services.monitor,
                 org.osgi.framework;version="1.3.0"
            
                
Package com.systemmanagement.cpumonitor.impl;
import com.systemmanagement.services.monitor.MonitorService;

public class CpuMonitor implements MonitorService {
  public String getMonitorMessage() {
        return "CPU--温度：40度，电压:1.4v";
  }
}

                
Package com.systemmanagement.cpumonitor;

import java.util.Hashtable;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import com.systemmanagement.cpumonitor.impl.CpuMonitor;
import com.systemmanagement.services.monitor.MonitorService;

public class CpuMonitorActivator implements BundleActivator {
    private BundleContext context=null;
    private ServiceRegistration serviceRegistration=null;
    
    public void start(BundleContext context) throws Exception {
        this.context=context;
        MonitorService monitor=new CpuMonitor();
        Properties properties = new Properties();
        properties.put("device", "cpu");
        serviceRegistration=this.context.registerService(
            MonitorService.class.getName(), monitor, properties);  
    }

    public void stop(BundleContext context) throws Exception {
        serviceRegistration.unregister();
        context=null;
    }
}

                
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Console Plug-in
Bundle-SymbolicName: com.systemmanagement.console
Bundle-Version: 1.0.0
Bundle-Activator: com.systemmanagement.console.ConsoleActivator
Bundle-Vendor: cyz
Bundle-Localization: plugin
Import-Package: com.systemmanagement.services.monitor,
                 org.osgi.framework;version="1.3.0",
                 org.osgi.util.tracker;version="1.3.1"
            
                
package com.systemmanagement.console;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
import com.systemmanagement.services.monitor.MonitorService;

public class MonitorServiceTracker implements ServiceTrackerCustomizer {
  private ConsoleThread thread;
  private BundleContext bc;
  
  public MonitorServiceTracker(BundleContext bc,ConsoleThread thread) {
    this.thread = thread;
    this.bc = bc;
  }
  public Object addingService(ServiceReference reference) {
    MonitorService service = (MonitorService)bc.getService(reference);
    thread.addService(service);
    return service;
  }
  public void modifiedService(ServiceReference reference, Object serviceObject) {
    MonitorService service = (MonitorService)bc.getService(reference);
    thread.addService(service);
  }
  public void removedService(ServiceReference reference, Object serviceObject) {
    MonitorService service = (MonitorService)bc.getService(reference);
    thread.removeService(service);
  }
}

                
package com.systemmanagement.console;

import java.util.HashSet;
import java.util.Iterator;
import com.systemmanagement.services.monitor.MonitorService;

public class ConsoleThread extends Thread {
  private HashSet<MonitorService> monitorServices=
    new HashSet<MonitorService>();
  private boolean running = true;
  public ConsoleThread(){};
  
  public void addService(MonitorService service){
    this.monitorServices.add(service);
  }
  public void removeService(MonitorService service){
    this.monitorServices.remove(service);
  }
  public void run() {
    while (running) {
        for(Iterator<MonitorService> it=this.monitorServices.iterator();
        it.hasNext();){
        MonitorService service=it.next();
        System.out.println(service.getMonitorMessage());
      }
      try {
        Thread.sleep(5000);
      } catch (InterruptedException e) {
        System.out.println("ManagementThread ERROR: " + e);
      }
    }
  }
  public void stopThread() {
    this.running = false;
    try {
      this.join();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
  }
}

                
package com.systemmanagement.console;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
import com.systemmanagement.services.monitor.MonitorService;

public class ConsoleActivator implements BundleActivator {
  
  private BundleContext context = null;
  private ServiceTracker tracker = null;
  private ConsoleThread thread=new ConsoleThread();
  
  public void start(BundleContext context) throws Exception {
    this.context = context;
    tracker = new ServiceTracker(context, MonitorService.class.getName(),
        new MonitorServiceTracker(context,thread));
    tracker.open();
    
    this.thread.start();
  }

  public void stop(BundleContext context) throws Exception {
    tracker.close();
    this.thread.stopThread();
  }
}

                
package com.systemmanagement.memorymonitor.impl;
import com.systemmanagement.services.monitor.MonitorService;

public class MemoryMonitor implements MonitorService {
  public String getMonitorMessage() {
    return "内存--物理内存总数：1G，可用数：300M";
  }
}

                
package com.systemmanagement.cpumonitor.impl;
import com.systemmanagement.services.monitor.MonitorService;

public class CpuMonitor implements MonitorService {
  public String getMonitorMessage() {
    return "CPU--温度：40度，电压:1.4v，CPU占用率:20%";
  }
}

E:SYSMGT_APP1
│  run.bat
│  org.eclipse.osgi_3.2.0.v20060601.jar
├─configuration
│      config.ini
└─plugins
       com.systemmanagement.console_1.0.0.jar
       com.systemmanagement.cpumonitor_1.0.0.jar
       com.systemmanagement.services_1.0.0.jar

osgi.bundles=plugins/com.systemmanagement.cpumonitor_1.0.0.jar@1:start, 
 plugins/com.systemmanagement.console_1.0.0.jar@2:start, 
 plugins/com.systemmanagement.services_1.0.0.jar

osgi.bundles=plugins/org.eclipse.equinox.common_3.2.0.v20060603.jar@1:start,
 plugins/org.eclipse.update.configurator_3.2.0.v20060605.jar@2:start,
 plugins/com.systemmanagement.cpumonitor_1.0.0.jar@2:start, 
 plugins/com.systemmanagement.console_1.0.0.jar@3:start

Manifest-Version: 1.0
Bundle-Name: %name
Bundle-SymbolicName: org.eclipse.pde.ui; singleton:=true
Bundle-Version: 3.1.0
Bundle-ClassPath: org.eclipse.pde.ui_3.1.0.jar
Bundle-Activator: org.eclipse.pde.internal.ui.PDEPlugin
Bundle-Vendor: %provider-name
Bundle-Localization: plugin
Require-Bundle: org.eclipse.core.runtime,
 org.eclipse.ui.ide,
 org.eclipse.ui.views,
 org.eclipse.jface.text,
 org.eclipse.ui.workbench.texteditor,
 org.eclipse.ui.editors,
 org.eclipse.ant.core,
 org.eclipse.core.resources,
 org.eclipse.debug.core,
 org.eclipse.debug.ui,
 org.eclipse.jdt.core,
 org.eclipse.jdt.debug.ui,
 org.eclipse.jdt.launching,
 org.eclipse.jdt.ui,
 org.eclipse.pde,
 org.eclipse.pde.build,
 org.eclipse.search,
 org.eclipse.team.core,
 org.eclipse.ui,
 org.eclipse.update.core,
 org.eclipse.ui.forms,
 org.eclipse.ant.ui,
 org.eclipse.jdt.junit,
 org.eclipse.ui.intro,
 org.eclipse.ui.cheatsheets,
 org.eclipse.update.configurator,
 org.eclipse.help.base
Bundle-ManifestVersion: 2
Eclipse-AutoStart: true
Export-Package: org.eclipse.pde.internal.ui;x-internal:=true,
 org.eclipse.pde.internal.ui.build;x-internal:=true,

 . . .

 org.eclipse.pde.ui,
 org.eclipse.pde.ui.internal.samples;x-internal:=true,
 org.eclipse.pde.ui.templates