Example usage for java.util ServiceLoader load

Introduction

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

Prototype

@CallerSensitive
public static <S> ServiceLoader<S> load(Class<S> service) 

Source Link

Document

Creates a new service loader for the given service type, using the current thread's java.lang.Thread#getContextClassLoader context class loader .

Usage

From source file:org.apache.pig.ExecTypeProvider.java

public static ExecType selectExecType(Properties properties) throws PigException {

    ServiceLoader<ExecType> frameworkLoader = ServiceLoader.load(ExecType.class);

    for (ExecType execType : frameworkLoader) {
        log.info("Trying ExecType : " + execType);
        if (execType.accepts(properties)) {
            log.info("Picked " + execType + " as the ExecType");
            return getSingleton(execType);
        } else {/*from  w  ww .j a  v  a2 s . c  o  m*/
            log.debug("Cannot pick " + execType + " as the ExecType");
        }
    }
    throw new PigException("Unknown exec type: " + properties.getProperty("exectype"), 2040);
}

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From source file:org.sventon.service.SVNProvider.java

/**
 * Loads the first available SVN provider on the classpath.
 *
 * @return Loaded SVN provider/*from   www .j  ava  2 s  . c  o m*/
 */
public static SVNProvider loadProvider() {
    final ServiceLoader<SVNProvider> loader = ServiceLoader.load(SVNProvider.class);
    for (SVNProvider svnProvider : loader) {
        LOGGER.info("Found SVNProvider: " + svnProvider.getClass());
        return svnProvider;
    }
    throw new IllegalStateException("Unable to find a SVNProvider");
}

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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   w w  w .  j av  a  2  s. c o  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:de.shadowhunt.subversion.RepositoryFactory.java

/**
 * Create a new {@link RepositoryFactory} instance each time the method is called.
 *
 * @return the new {@link RepositoryFactory} instance
 *
 * @throws SubversionException if no {@link RepositoryFactory} can be created
 *//*from  w  w w .j  a  v a  2 s  .  c  o  m*/
@SuppressWarnings("PMD.AvoidBranchingStatementAsLastInLoop")
public static RepositoryFactory getInstance() throws SubversionException {
    for (final RepositoryFactory factory : ServiceLoader.load(RepositoryFactory.class)) {
        return factory;
    }
    throw new SubversionException("Can not find a RepositoryFactory");
}

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From source file:therian.Therian.java

/**
 * Return an instance configured as {@link Therian#standard()} + {@link TherianModule}s discovered using the
 * {@link ServiceLoader} mechanism.//from   www  .  j  av  a  2s  .  co m
 *
 * @return Therian
 */
public static synchronized Therian usingDiscoveredModules() {
    if (usingDiscoveredModules == null) {
        final List<TherianModule> modules = new ArrayList<>();
        modules.add(DEFAULT_MODULE);
        for (TherianModule module : ServiceLoader.load(TherianModule.class)) {
            modules.add(module);
        }
        usingDiscoveredModules = new Therian(modules.toArray(new TherianModule[modules.size()]));
    }
    return usingDiscoveredModules;
}

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From source file:org.jbake.service.plugin.impl.DefaultJBakePluginService.java

private DefaultJBakePluginService() {
    //load all the classes in the classpath that have implemented the interface
    serviceLoader = ServiceLoader.load(AbstractJBakePlugin.class);
}

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From source file:org.cache2k.benchmark.impl2015.util.Log.java

public static synchronized Log getLog(String s) {
    Log l = loggers.get(s);/*ww  w  . ja  v  a 2  s.  c  om*/
    if (l != null) {
        return l;
    }
    if (logFactory != null) {
        l = logFactory.getLog(s);
        loggers.put(s, l);
        return l;
    }
    ServiceLoader<LogFactory> loader = ServiceLoader.load(LogFactory.class);
    for (LogFactory lf : loader) {
        logFactory = lf;
        getLog(Log.class.getName()).debug("New instance, using: " + logFactory);
        return getLog(s);
    }
    try {
        final org.apache.commons.logging.LogFactory cl = org.apache.commons.logging.LogFactory.getFactory();
        logFactory = new LogFactory() {
            @Override
            public Log getLog(String s) {
                return new CommonsLogger(cl.getInstance(s));
            }
        };
        getLog(Log.class.getName()).debug("New instance, using: " + logFactory);
        return getLog(s);
    } catch (NoClassDefFoundError ignore) {
    }
    logFactory = new LogFactory() {
        @Override
        public Log getLog(String s) {
            return new JdkLogger(Logger.getLogger(s));
        }
    };
    getLog(Log.class.getName()).debug("New instance, using: " + logFactory);
    return getLog(s);
}

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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  w  w w  .j  a  v  a  2  s.co  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:org.apache.hadoop.hbase.CompatibilitySingletonFactory.java

/**
 * Get the singleton instance of Any classes defined by compatibiliy jar's
 *
 * @return the singleton/*from  w  w  w  .  j  a  va  2 s  . co  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: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.// w w w.  j a  va2 s  . c  om
 */
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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