Example usage for java.util ServiceLoader loadInstalled

Introduction

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

Prototype

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

Source Link

Document

Creates a new service loader for the given service type, using the ClassLoader#getPlatformClassLoader() platform class loader .

Usage

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

/**
 * Get the preferences factory supplied by the JRE or
 * provided as a service./*from  www  .  j  av a  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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