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.lenskit.specs.SpecUtils.java

/**
 * Build an object from a specification.  On its own, this method does very little.  It depends on support from
 * objects in order to work./*  w  ww  .j  a  v  a 2 s. co  m*/
 *
 * It operates as follows:
 *
 * 1.  Load the {@link SpecHandler}s using {@link java.util.ServiceLoader}.
 * 2.  Query each spec handler, in turn, to try to find one that can build an object of type `type` from the spec.
 * 3.  If no such handler is found, try to invoke a static `fromSpec(AbstractSpec)` method on `type`.
 * 4.  If no such method is found, or it returns `null`, throw {@link NoSpecHandlerFound}.
 *
 * @param type The type of object to build.
 * @param spec The specification to use.
 * @param cl The class loader to search.
 * @param <T> The built object type.
 * @return The built object.  Will be `null` if and only if `spec` is `null`.
 * @throws NoSpecHandlerFound if no spec handler or `fromSpec` method can be found.
 */
@Nullable
public static <T> T buildObject(@Nonnull Class<T> type, @Nullable AbstractSpec spec, ClassLoader cl) {
    if (spec == null) {
        return null;
    }

    ServiceLoader<SpecHandler> loader;
    if (cl == null) {
        loader = ServiceLoader.load(SpecHandler.class);
    } else {
        loader = ServiceLoader.load(SpecHandler.class, cl);
    }
    for (SpecHandler h : loader) {
        T obj = h.build(type, spec);
        if (obj != null) {
            return obj;
        }
    }

    try {
        T obj = type.cast(MethodUtils.invokeStaticMethod(type, "fromSpec", spec));
        if (obj == null) {
            throw new NoSpecHandlerFound("No spec handler to build " + type + " from " + spec);
        } else {
            return obj;
        }
    } catch (NoSuchMethodException e) {
        throw new NoSpecHandlerFound("No spec handler to build " + type + " from " + spec);
    } catch (IllegalAccessException e) {
        throw new RuntimeException("access error invoking fromSpec on " + type, e);
    } catch (InvocationTargetException e) {
        throw new RuntimeException("Error occurred in fromSpec on " + type, e);
    }
}

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From source file:org.lable.oss.dynamicconfig.core.ConfigurationInitializer.java

static List<HierarchicalConfigurationDeserializer> detectDeserializationServiceProviders() {
    List<HierarchicalConfigurationDeserializer> providers = new ArrayList<>();
    ServiceLoader<HierarchicalConfigurationDeserializer> loader = ServiceLoader
            .load(HierarchicalConfigurationDeserializer.class);
    for (HierarchicalConfigurationDeserializer source : loader) {
        providers.add(source);//  www  . j av a2 s .  c  o  m
    }
    return providers;
}

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From source file:org.apache.hadoop.security.token.DtFileOperations.java

/** Fetch a token from a service and save to file in the local filesystem.
 *  @param tokenFile a local File object to hold the output.
 *  @param fileFormat a string equal to FORMAT_PB or FORMAT_JAVA, for output
 *  @param alias overwrite service field of fetched token with this text.
 *  @param service use a DtFetcher implementation matching this service text.
 *  @param url pass this URL to fetcher after stripping any http/s prefix.
 *  @param renewer pass this renewer to the fetcher.
 *  @param conf Configuration object passed along.
 *  @throws IOException// w  w  w  .  ja  va 2 s.co  m
 */
public static void getTokenFile(File tokenFile, String fileFormat, Text alias, Text service, String url,
        String renewer, Configuration conf) throws Exception {
    Token<?> token = null;
    Credentials creds = tokenFile.exists() ? Credentials.readTokenStorageFile(tokenFile, conf)
            : new Credentials();
    ServiceLoader<DtFetcher> loader = ServiceLoader.load(DtFetcher.class);
    for (DtFetcher fetcher : loader) {
        if (matchService(fetcher, service, url)) {
            if (!fetcher.isTokenRequired()) {
                String message = "DtFetcher for service '" + service
                        + "' does not require a token.  Check your configuration.  "
                        + "Note: security may be disabled or there may be two DtFetcher "
                        + "providers for the same service designation.";
                LOG.error(message);
                throw new IllegalArgumentException(message);
            }
            token = fetcher.addDelegationTokens(conf, creds, renewer, stripPrefix(url));
        }
    }
    if (alias != null) {
        if (token == null) {
            String message = "DtFetcher for service '" + service + "'"
                    + " does not allow aliasing.  Cannot apply alias '" + alias + "'."
                    + "  Drop alias flag to get token for this service.";
            LOG.error(message);
            throw new IOException(message);
        }
        Token<?> aliasedToken = token.copyToken();
        aliasedToken.setService(alias);
        creds.addToken(alias, aliasedToken);
        LOG.info("Add token with service " + alias);
    }
    doFormattedWrite(tokenFile, fileFormat, creds, conf);
}

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From source file:org.acmsl.queryj.tools.QueryJChain.java

/**
 * Fills given chain with external template bundles.
 * @param chain the chain.//from w w  w. j  ava 2 s .c  o  m
 * @throws QueryJBuildException if the handlers cannot be retrieved.
 */
@SuppressWarnings("unchecked")
protected void fillTemplateHandlers(@NotNull final Chain<QueryJCommand, QueryJBuildException, CH> chain)
        throws QueryJBuildException {
    // Don't know how to fix the generics warnings
    @NotNull
    final ServiceLoader<TemplateChainProvider> loader = ServiceLoader.load(TemplateChainProvider.class);

    if (loader.iterator().hasNext()) {
        // Don't know how to fix the generics warnings
        @NotNull
        final TemplateChainProvider provider = loader.iterator().next();

        // Don't know how to fix the generics warnings
        for (@Nullable
        final TemplateHandler<?> handler : (List<TemplateHandler<?>>) provider.getHandlers()) {
            if (handler != null) {
                chain.add((CH) handler);
            }
        }
    } else {
        throw new CannotFindTemplatesException(TemplateChainProvider.class);
    }
}

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From source file:org.projectforge.business.user.UserRightServiceImpl.java

private void initUserRightIds() {

    ServiceLoader<RightRightIdProviderService> serviceLoader = ServiceLoader
            .load(RightRightIdProviderService.class);
    for (RightRightIdProviderService service : serviceLoader) {
        String cname = service.getClass().getName();
        for (IUserRightId uid : service.getUserRightIds()) {
            if (userRightIds.containsKey(uid.getId()) == true) {
                Log.error("Duplicated UserId: " + uid.getId());
            }//  w ww  .jav a 2 s . c o  m
            userRightIds.put(uid.getId(), uid);
        }
    }

}

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From source file:com.amalto.core.storage.datasource.DataSourceFactory.java

private static DataSource getDataSourceConfiguration(Node document, String name, String path)
        throws XPathExpressionException {
    Node dataSource = (Node) evaluate(document, path, XPathConstants.NODE);
    if (dataSource == null) {
        return null;
    }//  ww  w  . ja  v a2 s.  co  m
    String type = (String) evaluate(dataSource, "type", XPathConstants.STRING); //$NON-NLS-1$
    // Invoke extensions for datasource extensions
    ServiceLoader<DataSourceExtension> extensions = ServiceLoader.load(DataSourceExtension.class);
    if (LOGGER.isDebugEnabled()) {
        StringBuilder extensionsAsString = new StringBuilder();
        int i = 0;
        for (DataSourceExtension extension : extensions) {
            extensionsAsString.append(extension.getClass().getName()).append(' ');
            i++;
        }
        if (i == 0) {
            LOGGER.debug("No datasource extension found");
        } else {
            LOGGER.debug("Found datasource extensions (" + i + " found): " + extensionsAsString);
        }
    }
    for (DataSourceExtension extension : extensions) {
        if (extension.accept(type)) {
            return extension.create(dataSource, name);
        } else {
            LOGGER.debug("Extension '" + extension + "' is not eligible for datasource type '" + type + "'.");
        }
    }
    throw new NotImplementedException("No support for type '" + type + "'.");
}

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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 {/*from  w w  w.  j a  v a 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.googlecode.fascinator.api.PluginManager.java

/**
 * Gets an authentication plugin/*from  w  w w  .ja va  2  s  .  c  om*/
 *
 * @param id plugin identifier
 * @return an authentication plugin, or null if not found
 */
public static Authentication getAuthentication(String id) {
    Class<Authentication> clazz = (Class<Authentication>) cache.getIfPresent("authentication" + id);
    if (clazz != null) {
        try {
            return clazz.newInstance();
        } catch (Exception e) {
            // Throwing RuntimeException to keep it unchecked
            // TODO: Remove later
            throw new RuntimeException(e);
        }
    }

    ServiceLoader<Authentication> plugins = ServiceLoader.load(Authentication.class);
    for (Authentication plugin : plugins) {
        if (id.equals(plugin.getId())) {
            return plugin;
        }
    }

    File groovyFile = getPathFile("plugins/authentication/" + id + ".groovy");
    if (groovyFile.exists()) {
        GroovyClassLoader gcl = new GroovyClassLoader();
        try {
            clazz = gcl.parseClass(groovyFile);
            cache.put("authentication" + id, clazz);
            return clazz.newInstance();

        } catch (Exception e) {
            // Throwing RuntimeException to keep it unchecked
            // TODO: Remove later
            throw new RuntimeException(e);
        }

    }
    return 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;
        }//from  ww  w  .jav  a 2  s.  com
    }
    fail("Failed to find UsernameFunctionProcessor via service loader.");
}

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From source file:org.commonjava.freeki.cli.Main.java

public void run() throws IOException, InvalidRemoteException, TransportException, GitAPIException {
    if (!canStart) {
        return;/*from   w w w. j ava 2  s .co m*/
    }

    start();
    final Vertx v = new DefaultVertx();
    setVertx(v);

    final GitManager git = new GitManager(config);
    final FreekiStore store = new FreekiStore(config, git);

    final Map<String, String> rawTemplateConf = new HashMap<>();
    rawTemplateConf.put("group@" + ContentType.TEXT_HTML.value(), "groovy/html/group.groovy");
    rawTemplateConf.put("page@" + ContentType.TEXT_HTML.value(), "groovy/html/page.groovy");
    rawTemplateConf.put("group@" + ContentType.TEXT_PLAIN.value(), "groovy/plain/group.groovy");
    rawTemplateConf.put("page@" + ContentType.TEXT_PLAIN.value(), "groovy/plain/page.groovy");

    final GTemplateConfig templateConfig = new GTemplateConfig(rawTemplateConf, config);

    final Set<ContentRenderer> renderers = new HashSet<>();
    renderers.add(new GTHtmlRenderer(templates, /*proc,*/templateConfig));
    renderers.add(new GTTextRenderer(templates, templateConfig));

    final JsonSerializer serializer = new JsonSerializer(/* new PrettyPrintingAdapter() */);
    renderers.add(new JsonRenderer(serializer));

    final RenderingEngine engine = new RenderingEngine(renderers);
    final Authorizer authorizer = new Authorizer(config);

    final StaticContentHandler staticContent = new StaticContentHandler(config);

    final Set<RouteHandler> handlers = new HashSet<RouteHandler>() {
        private static final long serialVersionUID = 1L;

        {
            add(new GroupContentHandler(store, engine, authorizer));
            add(new PageContentHandler(store, engine, authorizer));
            add(staticContent);
            add(new UpdateHandler(git));
            add(new TemplateContentHandler(new TemplateController(store, config), serializer));
            add(new ExportContentHandler(config, store));
        }
    };

    final ServiceLoader<RouteCollection> collections = ServiceLoader.load(RouteCollection.class);
    final ApplicationRouter router = new ApplicationRouter(handlers, collections);
    router.noMatch(staticContent);

    final String listen = config.getListen();
    vertx.createHttpServer().requestHandler(router).listen(config.getPort(), listen);

    printDiagnostics(git, config);

    System.out.printf("Listening for requests on %s:%s\n\n", config.getListen(), config.getPort());

    synchronized (this) {
        try {
            wait();
        } catch (final InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

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