Example usage for java.util ServiceLoader iterator

Introduction

In this page you can find the example usage for java.util ServiceLoader iterator.

Prototype

public Iterator<S> iterator() 

Source Link

Document

Returns an iterator to lazily load and instantiate the available providers of this loader's service.

Usage

From source file:org.apache.geode.geospatial.utils.ToolBox.java

public static <T> T getService(Class clazz) {
    ServiceLoader<T> loader = ServiceLoader.load(clazz);

    T returnValue = null;//from   ww  w  .  ja  va  2  s. c o  m

    Iterator<T> it = loader.iterator();
    //In theory the service providers are loaded lazily - so if there is a problem with a given service provider we
    // will log it and try the next.
    while (it.hasNext()) {
        try {
            returnValue = it.next();
            if (returnValue != null) {
                break;
            }
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            logger.error("Trying to find another ", clazz.getName());
        }
    }
    return returnValue;
}

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From source file:com.fluidops.iwb.api.valueresolver.ValueResolverUtil.java

/**
 * This method initializes custom {@link ValueResolver} extensions
 * using the Java {@link ServiceLoader} mechanism. It is invoked
 * on startup of the application, and looks up all registered
 * {@link ValueResolverFactory} in META-INF. See {@link ValueResolver}
 * for details.//from   ww  w  .ja va2 s  .co m
 */
public static void initializeValueResolverExtensions() {

    logger.info("Initializing value resolver extensions");

    ServiceLoader<ValueResolverFactory> serviceLoader = ServiceLoader.load(ValueResolverFactory.class);
    Iterator<ValueResolverFactory> iter = serviceLoader.iterator();
    while (iter.hasNext()) {
        ValueResolverFactory vrf = iter.next();
        ValueResolver valueResolver = vrf.create();
        logger.debug("Registered custom value resolver: " + valueResolver.name());
        ValueResolverRegistry.getInstance().register(valueResolver);
    }
}

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From source file:org.apache.hadoop.gateway.GatewaySslFuncTest.java

private static GatewayServices instantiateGatewayServices() {
    ServiceLoader<GatewayServices> loader = ServiceLoader.load(GatewayServices.class);
    Iterator<GatewayServices> services = loader.iterator();
    if (services.hasNext()) {
        return services.next();
    }//from   w w w  . jav a 2s  .  co m
    return null;
}

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From source file:com.alibaba.dragoon.common.protocol.transport.DragoonMessageCodec.java

public DragoonMessageCodec() {
    decoders.add(new DefaultDragoonMessageDecoder());

    ServiceLoader<DragoonMessageDecoder> serviceLoader = ServiceLoader.load(DragoonMessageDecoder.class);
    Iterator<DragoonMessageDecoder> it = serviceLoader.iterator();
    while (it.hasNext()) {
        DragoonMessageDecoder decoder = it.next();
        decoders.add(decoder);/*  w  w w.  j  av a2 s.  c  o m*/
    }
}

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From source file:com.twosigma.beaker.sql.JDBCClient.java

public void loadDrivers(List<String> pathList) {
    synchronized (this) {

        dsMap = new HashMap<>();
        drivers = new HashSet<>();

        Set<URL> urlSet = new HashSet<>();

        String dbDriverString = System.getenv("BEAKER_JDBC_DRIVER_LIST");
        if (dbDriverString != null && !dbDriverString.isEmpty()) {
            String[] dbDriverList = dbDriverString.split(File.pathSeparator);
            for (String s : dbDriverList) {
                try {
                    urlSet.add(toURL(s));
                } catch (MalformedURLException e) {
                    logger.error(e.getMessage());
                }/* w  w w.  j  a  v a  2 s . co m*/
            }
        }

        if (pathList != null) {
            for (String path : pathList) {
                path = path.trim();
                if (path.startsWith("--") || path.startsWith("#")) {
                    continue;
                }
                try {
                    urlSet.add(toURL(path));
                } catch (MalformedURLException e) {
                    logger.error(e.getMessage());
                }
            }
        }

        URLClassLoader loader = new URLClassLoader(urlSet.toArray(new URL[urlSet.size()]));

        ServiceLoader<Driver> loadedDrivers = ServiceLoader.load(Driver.class, loader);
        Iterator<Driver> driversIterator = loadedDrivers.iterator();
        try {
            while (driversIterator.hasNext()) {
                Driver d = driversIterator.next();
                drivers.add(d);
            }
        } catch (Throwable t) {
            logger.error(t.getMessage());
        }
    }
}

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From source file:org.camunda.bpm.admin.impl.web.SetupResource.java

protected ProcessEngine lookupProcessEngine(String engineName) {

    ServiceLoader<ProcessEngineProvider> serviceLoader = ServiceLoader.load(ProcessEngineProvider.class);
    Iterator<ProcessEngineProvider> iterator = serviceLoader.iterator();

    if (iterator.hasNext()) {
        ProcessEngineProvider provider = iterator.next();
        return provider.getProcessEngine(engineName);

    } else {/* w  w  w. ja  va 2s. c  o  m*/
        throw new RestException(Status.BAD_REQUEST,
                "Could not find an implementation of the " + ProcessEngineProvider.class + "- SPI");

    }

}

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From source file:com.clustercontrol.plugin.HinemosPluginService.java

/**
 * private(Singleton)./*from w w w  .  ja  va 2 s  .  c  o m*/
 */
private HinemosPluginService() {
    String pluginDir = System.getProperty("hinemos.manager.home.dir") + File.separator + "plugins";
    try {
        // /opt/hinemos/plugins??jar??
        ClassUtils.addDirToClasspath(new File(pluginDir));
        log.info("initialized plugin directory : " + pluginDir);
    } catch (Exception e) {
        log.warn("classpath configure failure. (pluginDir = " + pluginDir + ")", e);
    }

    ServiceLoader<HinemosPlugin> serviceLoader = ServiceLoader.load(HinemosPlugin.class);
    Iterator<HinemosPlugin> itr = serviceLoader.iterator();
    while (itr.hasNext()) {
        HinemosPlugin plugin = itr.next();

        pluginMap.put(plugin.getClass().getName(), plugin);
        pluginStatusMap.put(plugin.getClass().getName(), PluginStatus.NULL);
    }

}

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From source file:org.apache.hadoop.gateway.identityasserter.function.UsernameFunctionProcessorTest.java

@Test
public void testServiceLoader() throws Exception {
    ServiceLoader loader = ServiceLoader.load(UrlRewriteFunctionProcessor.class);
    Iterator iterator = loader.iterator();
    while (iterator.hasNext()) {
        Object object = iterator.next();
        if (object instanceof UsernameFunctionProcessor) {
            return;
        }/*  w w w.jav  a 2s  .  c  o  m*/
    }
    fail("Failed to find UsernameFunctionProcessor via service loader.");
}

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From source file:org.apache.hadoop.gateway.filter.rewrite.impl.FrontendFunctionProcessorTest.java

@SuppressWarnings("rawtypes")
@Test//from  ww w .  j  a  v a 2 s.  c  om
public void testServiceLoader() throws Exception {
    ServiceLoader loader = ServiceLoader.load(UrlRewriteFunctionProcessor.class);
    Iterator iterator = loader.iterator();
    assertThat("Service iterator empty.", iterator.hasNext());
    while (iterator.hasNext()) {
        Object object = iterator.next();
        if (object instanceof FrontendFunctionProcessor) {
            return;
        }
    }
    fail("Failed to find " + FrontendFunctionProcessor.class.getName() + " via service loader.");
}

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From source file:com.intelligentsia.dowsers.entity.reference.ReferenceTest.java

@Test
public void testReferenceFactoryProviderReference() {
    final ServiceLoader<ReferenceFactory> loader = ServiceLoader.load(ReferenceFactory.class,
            Thread.currentThread().getContextClassLoader());
    assertTrue(loader.iterator().hasNext());
    final Reference urn = new Reference(Person.class);
    assertEquals("com.intelligentsia.dowsers.entity.model.Person", urn.getEntityClassName());
}

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