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.pentaho.hadoop.shim.HadoopConfigurationLocator.java

/**
 * Locates an implementation of {@code service} using the {@link ServiceLoader}.
 *
 * @param cl Class loader to look for implementations in
 * @return The first implementation found.
 *///from   w ww . j a  v  a2 s.  c  o  m
protected <T> T locateServiceImpl(ClassLoader cl, Class<T> service) {
    ServiceLoader<T> loader = ServiceLoader.load(service, cl);
    Iterator<T> iter = loader.iterator();
    if (iter.hasNext()) {
        return iter.next();
    }
    return null;
}

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From source file:org.pentaho.pms.mql.dialect.SQLDialectFactory.java

/**
 * Load and register dialects defined as service providers implementing {@link SQLDialectInterface} (via Java's
 * ServiceLoader mechanism).// w  w  w.j  a  v  a 2s.c  om
 */
private void loadDialectPlugins() {
    ServiceLoader<SQLDialectInterface> dialects = ServiceLoader.load(SQLDialectInterface.class);
    Iterator<SQLDialectInterface> dialectIter = dialects.iterator();
    while (dialectIter.hasNext()) {
        SQLDialectInterface dialect = null;
        try {
            dialect = dialectIter.next(); // Try to instantiate the next dialect
        } catch (ServiceConfigurationError err) {
            // Log an error if dialect instantiation/registration fails for any other reason. We don't know the dialect
            // we attempted to load here so log it as a generic error with stack trace.
            logger.warn(Messages.getErrorString("SQLDialectFactory.WARN_0001_DIALECT_COULD_NOT_BE_LOADED", //$NON-NLS-1$
                    err.getMessage()));
            if (logger.isDebugEnabled()) {
                logger.debug(Messages.getErrorString("SQLDialectFactory.WARN_0001_DIALECT_COULD_NOT_BE_LOADED", //$NON-NLS-1$
                        err.getMessage()), err);
            }
        }
        if (dialect != null) {
            addDialect(dialect);
        }
    }
}

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From source file:org.seedstack.seed.security.internal.SeedSecurityCorePlugin.java

/**
 * Plugin constructor/*from   ww w .j  a  va 2 s  .com*/
 */
public SeedSecurityCorePlugin() {
    ServiceLoader<SeedSecurityPlugin> loader = ServiceLoader.load(SeedSecurityPlugin.class,
            SeedReflectionUtils.findMostCompleteClassLoader(SeedSecurityCorePlugin.class));
    Iterator<SeedSecurityPlugin> it = loader.iterator();
    if (!it.hasNext()) {
        securityPlugins.add(new DefaultSecurityPlugin());
    } else {
        while (it.hasNext()) {
            securityPlugins.add(it.next());
        }
    }
}

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From source file:org.sikuli.scriptrunner.ScriptRunner.java

public static void initScriptingSupport() {
    if (isReady) {
        return;//from  ww  w .ja va  2 s .c  o  m
    }
    log(lvl, "initScriptingSupport: enter");
    if (scriptRunner.isEmpty()) {
        EndingTypes.put("py", CPYTHON);
        EndingTypes.put("rb", CRUBY);
        EndingTypes.put("txt", CPLAIN);
        for (String k : EndingTypes.keySet()) {
            typeEndings.put(EndingTypes.get(k), k);
        }
        ServiceLoader<IScriptRunner> rloader = ServiceLoader.load(IScriptRunner.class);
        Iterator<IScriptRunner> rIterator = rloader.iterator();
        while (rIterator.hasNext()) {
            IScriptRunner current = null;
            try {
                current = rIterator.next();
            } catch (ServiceConfigurationError e) {
                log(lvl, "initScriptingSupport: warning: %s", e.getMessage());
                continue;
            }
            String name = current.getName();
            if (name != null && !name.startsWith("Not")) {
                scriptRunner.put(name, current);
                current.init(null);
                log(lvl, "initScriptingSupport: added: %s", name);
            }
        }
    }
    if (scriptRunner.isEmpty()) {
        Debug.error("Settings: No scripting support available. Rerun Setup!");
        String em = "Terminating: No scripting support available. Rerun Setup!";
        log(-1, em);
        if (Settings.isRunningIDE) {
            Sikulix.popError(em, "IDE has problems ...");
        }
        System.exit(1);
    } else {
        RDEFAULT = (String) scriptRunner.keySet().toArray()[0];
        EDEFAULT = scriptRunner.get(RDEFAULT).getFileEndings()[0];
        for (IScriptRunner r : scriptRunner.values()) {
            for (String e : r.getFileEndings()) {
                if (!supportedRunner.containsKey(EndingTypes.get(e))) {
                    supportedRunner.put(EndingTypes.get(e), r);
                }
            }
        }
    }
    log(lvl, "initScriptingSupport: exit with defaultrunner: %s (%s)", RDEFAULT, EDEFAULT);
    isReady = true;
}

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From source file:org.wildfly.security.tool.Command.java

protected Supplier<Provider[]> getProvidersSupplier(final String providersList) {
    return () -> {
        if (providersList != null && !providersList.isEmpty()) {
            final String[] providerNames = providersList.split(",");
            List<Provider> providers = new ArrayList<>(providerNames.length);
            for (String p : providerNames) {
                Provider provider = Security.getProvider(p.trim());
                if (provider != null) {
                    providers.add(provider);
                }/* w ww .j a  v  a  2s.  c  o m*/
            }
            ServiceLoader<Provider> providerLoader = ServiceLoader.load(Provider.class);
            for (Provider provider : providerLoader) {
                for (String p : providerNames) {
                    if (provider.getName().equals(p)) {
                        providers.add(provider);
                        break;
                    }
                }
            }
            if (providers.isEmpty()) {
                throw ElytronToolMessages.msg.unknownProvider(providersList);
            }
            return providers.toArray(new Provider[providers.size()]);
        } else {
            // when no provider list is specified, load all Providers from service loader except WildFlyElytron Provider
            ServiceLoader<Provider> providerLoader = ServiceLoader.load(Provider.class);
            Iterator<Provider> providerIterator = providerLoader.iterator();
            List<Provider> providers = new ArrayList<>();
            while (providerIterator.hasNext()) {
                Provider provider = providerIterator.next();
                if (provider.getName().equals("WildFlyElytron"))
                    continue;
                providers.add(provider);
            }
            return providers.toArray(new Provider[providers.size()]);
        }
    };
}

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From source file:org.wso2.carbon.apimgt.tracing.TracingServiceImpl.java

private TracingServiceImpl() {
    try {//from   w ww  .j a  v a 2 s  .  co  m
        String openTracerName = configuration.getFirstProperty(TracingConstants.OPEN_TRACER_NAME) != null
                ? configuration.getFirstProperty(TracingConstants.OPEN_TRACER_NAME)
                : TracingConstants.DEFAULT_OPEN_TRACER_NAME;

        Boolean remoteTracerEnabled = Boolean
                .valueOf(configuration.getFirstProperty(TracingConstants.OPEN_TRACER_ENABLED) != null
                        ? configuration.getFirstProperty(TracingConstants.OPEN_TRACER_ENABLED)
                        : TracingConstants.DEFAULT_OPEN_TRACER_ENABLED);

        String tracerName = (openTracerName != null && remoteTracerEnabled) ? openTracerName
                : TracingConstants.LOG;

        ServiceLoader<OpenTracer> openTracers = ServiceLoader.load(OpenTracer.class,
                OpenTracer.class.getClassLoader());
        Iterator iterator = openTracers.iterator();
        while (iterator.hasNext()) {
            OpenTracer openTracer = (OpenTracer) iterator.next();
            if (tracerName.equalsIgnoreCase(openTracer.getName())) {
                this.tracer = openTracer;
            }
        }
    } catch (Exception e) {
        log.error("Error in reading openTracerName", e);
    }
}

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