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.hadoop.gateway.deploy.impl.ShiroDeploymentContributorTest.java

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

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From source file:org.apache.hadoop.gateway.hostmap.impl.HostmapDeploymentContributorTest.java

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

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From source file:org.apache.hadoop.hbase.CompatibilityFactory.java

public static synchronized <T> T getInstance(Class<T> klass) {
    T instance = null;//from   www. j av  a 2s .co m
    try {
        ServiceLoader<T> loader = ServiceLoader.load(klass);
        Iterator<T> it = loader.iterator();
        instance = it.next();
        if (it.hasNext()) {
            StringBuilder msg = new StringBuilder();
            msg.append("ServiceLoader provided more than one implementation for class: ").append(klass)
                    .append(", using implementation: ").append(instance.getClass())
                    .append(", other implementations: {");
            while (it.hasNext()) {
                msg.append(it.next()).append(" ");
            }
            msg.append("}");
            LOG.warn(msg);
        }
    } catch (Exception e) {
        throw new RuntimeException(createExceptionString(klass), e);
    } catch (Error e) {
        throw new RuntimeException(createExceptionString(klass), e);
    }

    // If there was nothing returned and no exception then throw an exception.
    if (instance == null) {
        throw new RuntimeException(createExceptionString(klass));
    }
    return instance;
}

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From source file:org.apache.hadoop.hbase.CompatibilitySingletonFactory.java

/**
 * Get the singleton instance of Any classes defined by compatibiliy jar's
 *
 * @return the singleton/*  w  w  w.  ja  v a2 s  . c o m*/
 */
@SuppressWarnings("unchecked")
public static <T> T getInstance(Class<T> klass) {
    synchronized (SingletonStorage.INSTANCE.lock) {
        T instance = (T) SingletonStorage.INSTANCE.instances.get(klass);
        if (instance == null) {
            try {
                ServiceLoader<T> loader = ServiceLoader.load(klass);
                Iterator<T> it = loader.iterator();
                instance = it.next();
                if (it.hasNext()) {
                    StringBuilder msg = new StringBuilder();
                    msg.append("ServiceLoader provided more than one implementation for class: ").append(klass)
                            .append(", using implementation: ").append(instance.getClass())
                            .append(", other implementations: {");
                    while (it.hasNext()) {
                        msg.append(it.next()).append(" ");
                    }
                    msg.append("}");
                    LOG.warn(msg);
                }
            } catch (Exception e) {
                throw new RuntimeException(createExceptionString(klass), e);
            } catch (Error e) {
                throw new RuntimeException(createExceptionString(klass), e);
            }

            // If there was nothing returned and no exception then throw an exception.
            if (instance == null) {
                throw new RuntimeException(createExceptionString(klass));
            }
            SingletonStorage.INSTANCE.instances.put(klass, instance);
        }
        return instance;
    }

}

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From source file:org.apache.jackrabbit.oak.run.osgi.OakOSGiRepositoryFactory.java

private PojoServiceRegistry createServiceRegistry(Map<String, Object> config) {
    try {//from   www.  j a va  2s  .  c  o  m
        ServiceLoader<PojoServiceRegistryFactory> loader = ServiceLoader.load(PojoServiceRegistryFactory.class);
        return loader.iterator().next().newPojoServiceRegistry(config);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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From source file:org.cellprofiler.preferences.CellProfilerPreferences.java

/**
 * Get the preferences factory supplied by the JRE or
 * provided as a service./*  w ww.  ja  va 2 s  .c o m*/
 * 
 * @return the default preferences factory.
 */
static private PreferencesFactory getJREPreferencesFactory() {
    synchronized (lock) {
        if (delegatePreferencesFactory == null) {
            do {
                /*
                 * First, see if there is a PreferencesFactory
                 * provided as a service.
                 */
                final ServiceLoader<PreferencesFactory> pfServiceLoader = ServiceLoader
                        .loadInstalled(PreferencesFactory.class);
                final Iterator<PreferencesFactory> pfIter = pfServiceLoader.iterator();
                if (pfIter.hasNext()) {
                    delegatePreferencesFactory = pfIter.next();
                    break;
                }
                /*
                 * Next, try the WindowsPreferencesFactory if OS is Windows.
                 */
                String pfName = (SystemUtils.IS_OS_WINDOWS) ? "java.util.prefs.WindowsPreferencesFactory"
                        : "java.util.prefs.FilePreferencesFactory";
                try {
                    Class<?> pfClass = Class.forName("java.util.prefs.WindowsPreferencesFactory", false, null);
                    Class<?> pfFuckYou = Class.forName("java.util.prefs.WindowsPreferences", true, null);
                    Constructor<?>[] pfConstructors = pfClass.getDeclaredConstructors();
                    for (Constructor<?> c : pfConstructors) {
                        if (c.getParameterTypes().length == 0) {
                            /*
                             * Bad boy - it's package-private AND I CALL IT ANYWAY BAH HA HA HA HA HA HA
                             */
                            c.setAccessible(true);
                            delegatePreferencesFactory = (PreferencesFactory) c.newInstance(new Object[0]);
                            break;
                        }
                    }
                    break;
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                } catch (SecurityException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (InstantiationException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                /*
                 * And as a last resort, there's always our headless
                 * preferences factory.
                 */
                delegatePreferencesFactory = new HeadlessPreferencesFactory();
            } while (false);
        }
    }
    return delegatePreferencesFactory;

}

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From source file:org.commonjava.maven.cartographer.ftest.AbstractCartographerTCK.java

@Before
public void before() throws Exception {
    final ServiceLoader<CartoTCKDriver> driverLoader = ServiceLoader.load(CartoTCKDriver.class);
    final Iterator<CartoTCKDriver> driverIter = driverLoader.iterator();
    if (!driverIter.hasNext()) {
        throw new IllegalStateException("No TCK driver found!");
    }//from   www  .j av a 2 s  .c om

    driver = driverIter.next();

    carto = driver.start(temp);
}

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From source file:org.commonjava.maven.cartographer.ftest.LocalTestDriver.java

@Override
public Cartographer start(TemporaryFolder temp) throws Exception {
    sourceManager = new SourceManagerImpl();

    temp.create();//w  ww  .ja  v a  2 s.  c  o m

    File homeDir = temp.newFolder("carto-home");
    File configDir = new File(homeDir, "etc");
    configDir.mkdirs();

    configurator.accept(configDir);

    final ServiceLoader<BootOptions> loader = ServiceLoader.load(BootOptions.class);
    final BootOptions opts = loader.iterator().next();

    options = (Options) opts;
    options.setPort(-1);
    options.setHomeDir(homeDir.getAbsolutePath());

    // Should not need this; the configurator should be smart enough to try ${carto.home}/etc/main.conf on its own.
    //        options.setConfig( new File( configDir, MAIN_CONF ).getAbsolutePath() );

    booter = new Booter();
    bootStatus = booter.start(options);

    if (bootStatus == null) {
        fail("No boot status");
    }

    Throwable t = bootStatus.getError();
    if (t != null) {
        throw new RuntimeException("Failed to start Cartographer test server.", t);
    }

    assertThat(bootStatus.isSuccess(), equalTo(true));

    WeldContainer container = booter.getContainer();
    sourceManager = container.instance().select(SourceManagerImpl.class).get();

    passwordManager = new MemoryPasswordManager();
    siteConfig = new SiteConfigBuilder("local-test", formatUrl().toString()).withRequestTimeoutSeconds(30)
            .build();
    httpFactory = new HttpFactory(passwordManager);

    carto = new ClientCartographer(siteConfig, httpFactory);
    return carto;
}

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From source file:org.commonjava.test.compile.CompilerFixxxtureTest.java

@Test
public void compileDependingOnlyOnJDK_UseServiceLoader() throws Exception {
    final CompilerResult result = compiler.compileSourceDirWithThisClass("jdk-only-service", "org.test.Hello");

    FileUtils.write(Paths.get(result.getClasses().getAbsolutePath(), "META-INF", "services", "org.test.IHello")
            .toFile(), "org.test.Hello");

    final URLClassLoader ucl = result.getClassLoader();
    final Class<?> cls = ucl.loadClass("org.test.IHello");
    final ServiceLoader<?> loader = ServiceLoader.load(cls, ucl);
    final Object object = loader.iterator().next();

    final Method method = cls.getMethod("hello", new Class[] { String[].class });

    System.out.println(method);/*from   ww w.ja  v a2s .  c  o m*/
    method.invoke(object, new Object[] { new String[] { "Tester" } });
}

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From source file:org.deegree.services.csw.CSWController.java

private GetRecordByIdHandler getGetRecordByIdHandler() {
    ServiceLoader<GetRecordByIdHandler> serviceLoader = ServiceLoader.load(GetRecordByIdHandler.class);
    Iterator<GetRecordByIdHandler> iterator = serviceLoader.iterator();
    if (iterator.hasNext())
        return iterator.next();
    return new DefaultGetRecordByIdHandler();
}

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