Example usage for org.apache.commons.discovery ResourceClassIterator nextResourceClass

Introduction

In this page you can find the example usage for org.apache.commons.discovery ResourceClassIterator nextResourceClass.

Prototype

public abstract ResourceClass nextResourceClass();

Source Link

Usage

From source file:org.apache.axis.AxisProperties.java

public static Object newInstance(final Class spiClass, final Class constructorParamTypes[],
        final Object constructorParams[]) {
    return AccessController.doPrivileged(new PrivilegedAction() {
        public Object run() {
            ResourceClassIterator services = getResourceClassIterator(spiClass);

            Object obj = null;/*from w w w.jav  a2 s.c  o  m*/
            while (obj == null && services.hasNext()) {
                Class service = services.nextResourceClass().loadClass();

                /* service == null
                 * if class resource wasn't loadable
                 */
                if (service != null) {
                    /* OK, class loaded.. attempt to instantiate it.
                     */
                    try {
                        ClassUtils.verifyAncestory(spiClass, service);
                        obj = ClassUtils.newInstance(service, constructorParamTypes, constructorParams);
                    } catch (InvocationTargetException e) {
                        if (e.getTargetException() instanceof java.lang.NoClassDefFoundError) {
                            log.debug(Messages.getMessage("exception00"), e);
                        } else {
                            log.warn(Messages.getMessage("exception00"), e);
                        }
                    } catch (Exception e) {
                        log.warn(Messages.getMessage("exception00"), e);
                    }
                }
            }

            return obj;
        }
    });
}

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From source file:org.apache.axis.configuration.EngineConfigurationFactoryFinder.java

/**
 * Create the default engine configuration and detect whether the user
 * has overridden this with their own./*from   ww  w.  j  a v  a 2s . co  m*/
 *
 * The discovery mechanism will use the following logic:
 *
 * - discover all available EngineConfigurationFactories
 *   - find all META-INF/services/org.apache.axis.EngineConfigurationFactory
 *     files available through class loaders.
 *   - read files (see Discovery) to obtain implementation(s) of that
 *     interface
 * - For each impl, call 'newFactory(Object param)'
 * - Each impl should examine the 'param' and return a new factory ONLY
 *   - if it knows what to do with it
 *     (i.e. it knows what to do with the 'real' type)
 *   - it can find it's configuration information
 * - Return first non-null factory found.
 * - Try EngineConfigurationFactoryServlet.newFactory(obj)
 * - Try EngineConfigurationFactoryDefault.newFactory(obj)
 * - If zero found (all return null), throw exception
 *
 * ***
 * This needs more work: System.properties, etc.
 * Discovery will have more tools to help with that
 * (in the manner of use below) in the near future.
 * ***
 *
 */
public static EngineConfigurationFactory newFactory(final Object obj) {
    /**
     * recreate on each call is critical to gaining
     * the right class loaders.  Do not cache.
     */
    final Object[] params = new Object[] { obj };

    /**
     * Find and examine each service
     */
    return (EngineConfigurationFactory) AccessController.doPrivileged(new PrivilegedAction() {
        public Object run() {
            ResourceClassIterator services = AxisProperties.getResourceClassIterator(mySpi);

            EngineConfigurationFactory factory = null;

            while (factory == null && services.hasNext()) {
                try {
                    Class service = services.nextResourceClass().loadClass();

                    /* service == null
                     * if class resource wasn't loadable
                     */
                    if (service != null) {
                        factory = newFactory(service, newFactoryParamTypes, params);
                    }
                } catch (Exception e) {
                    // there was an exception creating the factory
                    // the most likely cause was the JDK 1.4 problem
                    // in the discovery code that requires servlet.jar
                    // to be in the client classpath.  For now, fall
                    // through to the next factory
                }
            }

            if (factory != null) {
                if (log.isDebugEnabled()) {
                    log.debug(Messages.getMessage("engineFactory", factory.getClass().getName()));
                }
            } else {
                log.error(Messages.getMessage("engineConfigFactoryMissing"));
                // we should be throwing an exception here,
                //
                // but again, requires more refactoring than we want to swallow
                // at this point in time.  Ifthis DOES occur, it's a coding error:
                // factory should NEVER be null.
                // Testing will find this, as NullPointerExceptions will be generated
                // elsewhere.
            }

            return factory;
        }
    });
}

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From source file:picocash.services.ServiceDiscover.java

public static List<Object> getAll(Class<?> clazz) {
    DiscoverClasses clss = new DiscoverClasses();

    ResourceClassIterator iter = clss.findResourceClasses(clazz.getName());
    while (iter.hasNext()) {

        Object object = iter.nextResourceClass().loadClass();
        log.debug(object);/*from w  ww  . j  a v a  2s.co m*/

    }
    return null;
}

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