Examples with ServiceTracker org.osgi.util.tracker.ServiceTracker used on opensource projects

Example 96 with ServiceTracker

use of org.osgi.util.tracker.ServiceTracker in project stanbol by apache.

the class CacheComponent method activate.

@Activate
protected void activate(final ComponentContext context) throws ConfigurationException, YardException, IllegalStateException, InvalidSyntaxException {
    if (context == null || context.getProperties() == null) {
        throw new IllegalStateException(String.format("Invalid ComponentContext parsed in activate (context=%s)", context));
    }
    this.cc = context;
    Object value = context.getProperties().get(Cache.ADDITIONAL_MAPPINGS);
    if (value instanceof String[]) {
        this.additionalMappings = (String[]) value;
    } else if (value instanceof String) {
        this.additionalMappings = new String[] { (String) value };
    } else if (value instanceof Collection<?>) {
        try {
            additionalMappings = ((Collection<?>) value).toArray(new String[((Collection<?>) value).size()]);
        } catch (ArrayStoreException e) {
            throw new ConfigurationException(Cache.ADDITIONAL_MAPPINGS, "Additional Mappings MUST BE a String, String[] or Collection<String>!", e);
        }
    } else {
        additionalMappings = null;
    }
    String yardId = OsgiUtils.checkProperty(context.getProperties(), Cache.CACHE_YARD).toString();
    String cacheFilter = String.format("(&(%s=%s)(%s=%s))", Constants.OBJECTCLASS, Yard.class.getName(), Yard.ID, yardId);
    yardTracker = new ServiceTracker(context.getBundleContext(), context.getBundleContext().createFilter(cacheFilter), new ServiceTrackerCustomizer() {

        //store the reference to the ComponentContext to avoid NPE if deactivate
        //is called for the CacheComponent
        final ComponentContext cc = context;

        @Override
        public void removedService(ServiceReference reference, Object service) {
            if (service.equals(yard)) {
                yard = (Yard) yardTracker.getService();
                updateServiceRegistration(cc, yard, additionalMappings, nsPrefixService);
            }
            cc.getBundleContext().ungetService(reference);
        }

        @Override
        public void modifiedService(ServiceReference reference, Object service) {
            //the service.ranking might have changed ... so check if the
            //top ranked Cache is a different one
            Yard newYard = (Yard) yardTracker.getService();
            if (newYard == null || !newYard.equals(cache)) {
                //set the new cahce
                yard = newYard;
                //and update the service registration
                updateServiceRegistration(cc, yard, additionalMappings, nsPrefixService);
            }
        }

        @Override
        public Object addingService(ServiceReference reference) {
            Object service = cc.getBundleContext().getService(reference);
            if (service != null) {
                if (//the first added Service or
                yardTracker.getServiceReference() == null || //the new service as higher ranking as the current
                (reference.compareTo(yardTracker.getServiceReference()) > 0)) {
                    yard = (Yard) service;
                    updateServiceRegistration(cc, yard, additionalMappings, nsPrefixService);
                }
            // else the new service has lower ranking as the currently use one
            }
            //else service == null -> ignore
            return service;
        }
    });
    yardTracker.open();
}

Example 97 with ServiceTracker

use of org.osgi.util.tracker.ServiceTracker in project tika by apache.

the class TikaActivator method start.

//-----------------------------------------------------< BundleActivator >
public void start(final BundleContext context) throws Exception {
    bundleContext = context;
    detectorTracker = new ServiceTracker(context, Detector.class.getName(), this);
    parserTracker = new ServiceTracker(context, Parser.class.getName(), this);
    detectorTracker.open();
    parserTracker.open();
}

Example 98 with ServiceTracker

use of org.osgi.util.tracker.ServiceTracker in project stanbol by apache.

the class EntityhubLinkingEngine method activate.

@Activate
@SuppressWarnings("unchecked")
protected void activate(ComponentContext ctx) throws ConfigurationException {
    Dictionary<String, Object> properties = ctx.getProperties();
    bundleContext = ctx.getBundleContext();
    EntityLinkerConfig linkerConfig = EntityLinkerConfig.createInstance(properties, prefixService);
    TextProcessingConfig textProcessingConfig = TextProcessingConfig.createInstance(properties);
    Object value = properties.get(SITE_ID);
    //init the EntitySource
    if (value == null) {
        throw new ConfigurationException(SITE_ID, "The ID of the Referenced Site is a required Parameter and MUST NOT be NULL!");
    }
    siteName = value.toString();
    if (siteName.isEmpty()) {
        throw new ConfigurationException(SITE_ID, "The ID of the Referenced Site is a required Parameter and MUST NOT be an empty String!");
    }
    //get the metadata later set to the enhancement engine
    String engineName;
    engineMetadata = new Hashtable<String, Object>();
    value = properties.get(PROPERTY_NAME);
    if (value == null || value.toString().isEmpty()) {
        throw new ConfigurationException(PROPERTY_NAME, "The EnhancementEngine name MUST BE configured!");
    } else {
        engineName = value.toString();
    }
    engineMetadata.put(PROPERTY_NAME, value);
    value = properties.get(Constants.SERVICE_RANKING);
    engineMetadata.put(Constants.SERVICE_RANKING, value == null ? Integer.valueOf(0) : value);
    //init the tracking entity searcher
    trackedServiceCount = 0;
    if (Entityhub.ENTITYHUB_IDS.contains(siteName.toLowerCase())) {
        entitySearcher = new EntityhubSearcher(bundleContext, 10, this);
    } else {
        entitySearcher = new ReferencedSiteSearcher(bundleContext, siteName, 10, this);
    }
    labelTokenizerTracker = new ServiceTracker(bundleContext, LabelTokenizer.class.getName(), new ServiceTrackerCustomizer() {

        @Override
        public Object addingService(ServiceReference reference) {
            Object service = bundleContext.getService(reference);
            if (service == null) {
                return service;
            }
            synchronized (labelTokenizersRefs) {
                labelTokenizersRefs.add(reference);
                ServiceReference higest;
                try {
                    higest = labelTokenizersRefs.last();
                } catch (NoSuchElementException e) {
                    higest = null;
                }
                EntityLinkingEngine engine = entityLinkingEngine;
                ServiceTracker tracker = labelTokenizerTracker;
                if (engine != null && tracker != null) {
                    LabelTokenizer lt = (LabelTokenizer) (reference.equals(higest) || higest == null ? service : tracker.getService(higest));
                    if (!lt.equals(engine.getLabelTokenizer())) {
                        log.info(" ... setting LabelTokenizer of Engine '{}' to {}", engine.getName(), lt);
                        engine.setLabelTokenizer(lt);
                    }
                }
            //if engine or tracker is null deactivate was already called
            }
            return service;
        }

        @Override
        public void removedService(ServiceReference reference, Object service) {
            synchronized (labelTokenizersRefs) {
                //override
                labelTokenizersRefs.remove(reference);
                EntityLinkingEngine engine = entityLinkingEngine;
                ServiceTracker tracker = labelTokenizerTracker;
                if (engine != null && tracker != null) {
                    if (labelTokenizersRefs.isEmpty()) {
                        log.info(" ... setting LabelTokenizer of Engine '{}' to null", engine.getName());
                        engine.setLabelTokenizer(null);
                    } else {
                        LabelTokenizer lt = (LabelTokenizer) tracker.getService(labelTokenizersRefs.last());
                        if (!lt.equals(engine.getLabelTokenizer())) {
                            log.info(" ... setting LabelTokenizer of Engine '{}' to {}", engine.getName(), lt);
                            engine.setLabelTokenizer(lt);
                        }
                    }
                }
            //if engine or tracker is null deactivate was already called
            }
            bundleContext.ungetService(reference);
        }

        @Override
        public void modifiedService(ServiceReference reference, Object service) {
            synchronized (labelTokenizersRefs) {
                //override
                labelTokenizersRefs.remove(reference);
                labelTokenizersRefs.add(reference);
                ServiceReference higest;
                try {
                    higest = labelTokenizersRefs.last();
                } catch (NoSuchElementException e) {
                    higest = null;
                }
                EntityLinkingEngine engine = entityLinkingEngine;
                ServiceTracker tracker = labelTokenizerTracker;
                if (engine != null && tracker != null) {
                    LabelTokenizer lt = (LabelTokenizer) (reference.equals(higest) || higest == null ? service : tracker.getService(higest));
                    if (!lt.equals(engine.getLabelTokenizer())) {
                        log.info(" ... setting LabelTokenizer of Engine '{}' to {}", engine.getName(), lt);
                        engine.setLabelTokenizer(lt);
                    }
                }
            //if engine or tracker is null deactivate was already called
            }
        }
    });
    //create the engine
    entityLinkingEngine = new EntityLinkingEngine(engineName, //the searcher might not be available
    entitySearcher, textProcessingConfig, linkerConfig, null);
    //start tracking
    labelTokenizerTracker.open();
    entitySearcher.open();
}

Example 99 with ServiceTracker

use of org.osgi.util.tracker.ServiceTracker in project bnd by bndtools.

the class OSGiTestCase method withService.

/**
	 * <p>
	 * Perform the specified operation against a service, if available.
	 * </p>
	 * <p>
	 * <strong>Example:</strong>
	 * </p>
	 * 
	 * <pre>
	 * String reply = withService(HelloService.class, null, 0, new Operation&lt;HelloService,String&gt;() {
	 * 	public String call(HelloService service) {
	 * 		return service.sayHello();
	 * 	}
	 * });
	 * </pre>
	 * 
	 * @param <S> The service type.
	 * @param <R> The result type.
	 * @param service The service class.
	 * @param filter An additional filter expression, or {@code
	 * null}.
	 * @param timeout The maximum time to wait (in ms) for a service to become
	 *            available; a zero or negative timeout implies we should fail
	 *            if the service is not immediatelt available.
	 * @param operation The operation to perform against the service.
	 * @throws Exception
	 */
protected <S, R> R withService(Class<S> service, String filter, long timeout, Operation<? super S, R> operation) throws Exception {
    BundleContext context = getBundleContext();
    ServiceTracker tracker = null;
    if (filter != null) {
        try {
            Filter combined = FrameworkUtil.createFilter("(" + Constants.OBJECTCLASS + "=" + service.getName() + ")");
            tracker = new ServiceTracker(context, combined, null);
        } catch (InvalidSyntaxException e) {
            fail("Invalid filter syntax.");
            return null;
        }
    } else {
        tracker = new ServiceTracker(context, service.getName(), null);
    }
    try {
        tracker.open();
        Object instance;
        if (timeout <= 0) {
            instance = tracker.getService();
        } else {
            instance = tracker.waitForService(timeout);
        }
        if (instance == null || !service.isInstance(instance))
            fail(MessageFormat.format("Service \"{0}\" not available.", service.getName()));
        @SuppressWarnings("unchecked") S casted = (S) instance;
        return operation.perform(casted);
    } catch (InterruptedException e) {
        fail("Interrupted.");
    } finally {
        tracker.close();
    }
    // unreachable
    return null;
}

Example 100 with ServiceTracker

use of org.osgi.util.tracker.ServiceTracker in project sling by apache.

the class RendererSelectorImpl method activate.

protected void activate(ComponentContext ctx) throws ServletException, NamespaceException {
    bundleContext = ctx.getBundleContext();
    renderersTracker = new ServiceTracker(ctx.getBundleContext(), Renderer.class.getName(), null);
    renderersTracker.open();
}