Apache Felix File Install jar from deploy folder

问题

I am trying to use Apache Felix File Install with an embedded version of Felix. The basic idea is simple, I have a jar application file that can be launched using standard java -jar app.jar and the application will startup Apache Felix framework and then look in a hot deploy folder installing, updating and removing the OSGi bundles that are in/placed/updated/removed from that folder at runtime.

I currently have managed to create the ability to startup the embedded Felix and I can deploy bundles if I specify them via BundleContext.installBundle() but I cant get the jar bundles to be dynamically harvested from the hot folder.

This is what I currently have:

public static void main(String[] args) throws Exception {

    System.setProperty("felix.fileinstall.noInitialDelay", "true");
    System.setProperty("felix.fileinstall.poll", "1000");
    System.setProperty("felix.fileinstall.dir", "./hot-deploy");

    System.out.println("Building OSGi Framework");

    FrameworkFactory frameworkFactory = ServiceLoader.load(FrameworkFactory.class).iterator().next();
    Map<String, String> config = new HashMap<>();

    // make sure the cache is cleaned
    config.put(Constants.FRAMEWORK_STORAGE_CLEAN, Constants.FRAMEWORK_STORAGE_CLEAN_ONFIRSTINIT);

    // more properties available at: http://felix.apache.org/documentation/subprojects/apache-felix-service-component-runtime.html
    config.put("ds.showtrace", "true");
    config.put("ds.showerrors", "true");

    Framework framework = frameworkFactory.newFramework(config);
    framework.start();

    // declarative services dependency is necessary, otherwise they won't be picked up!
    loadScrBundle(framework);

    BundleContext context = framework.getBundleContext();
    List<Bundle> installedBundles = new LinkedList<>();

    //installedBundles.add(context.installBundle("file:./Sandbox/osgiTest/module-a/target/module-a-1.0-SNAPSHOT.jar"));

    for (Bundle bundle : installedBundles) {
        if (bundle.getHeaders().get(Constants.FRAGMENT_HOST) == null) {
            bundle.start();
        }
    }

    try {
        framework.waitForStop(0);
    } finally {
        System.exit(0);
    }

}

private static void loadScrBundle(Framework framework) throws URISyntaxException, BundleException {
    URL url = Activator.class.getClassLoader().getResource("org/apache/felix/scr/ScrService.class");
    if (url == null) {
        throw new RuntimeException("Could not find the class org.apache.felix.scr.ScrService");
    }
    String jarPath = url.toURI().getSchemeSpecificPart().replaceAll("!.*", "");
    System.out.println("Found declarative services implementation: " + jarPath);
    framework.getBundleContext().installBundle(jarPath).start();
}

回答1:

Turns out that felix.fileinstall itself is a bundle that must be started in the host application before it can watch a directory. All that is required from my initial implementation to work is to install and start the fileinstall bundle:

installedBundles.add(context.installBundle("file:path/to/fileinstall.jar"));

回答2:

You need to make use of the Felix AutoProcessor and pass the properties to it as well to the framework.

final Map<String, String> config = new HashMap<>();
// Probably there is a much better way to o this...
System.getProperties().forEach((key, value) -> config.put(key.toString(), value.toString()));

// Set the properties
config.put(AutoProcessor.AUTO_DEPLOY_DIR_PROPERTY, "hot-deploy");
config.put(AutoProcessor.AUTO_DEPLOY_ACTION_PROPERTY, "install,update,start");
config.put(Constants.FRAMEWORK_STORAGE_CLEAN, Constants.FRAMEWORK_STORAGE_CLEAN_ONFIRSTINIT);
config.put(Constants.FRAMEWORK_STORAGE, "cache");

Then instantiate the framework and run the AutoProcessor as followed:

final FrameworkFactory factory = new org.apache.felix.framework.FrameworkFactory();
final Framework framework = factory.newFramework(config);

try
{
    framework.init();

    AutoProcessor.process(config, framework.getBundleContext());

    FrameworkEvent event;

    do
    {
        framework.start();
        event = framework.waitForStop(0L);

    } while (event.getType() == 128);

}
catch (final Throwable e)
{
    e.printStackTrace();
}

AutoProcessor.process calls AutoProcessor.processAutoDeploy then, which auto deploys the bundles at startup. Without calling AutoProcessor.process it won't work which probably was your issue.

来源：https://stackoverflow.com/questions/32386722/apache-felix-file-install-jar-from-deploy-folder