/**
* Initialize all services define in the {@link #CONF_SERVICE_CLASSES} configuration property.
*
* @throws ServiceException thrown if any of the services could not initialize.
*/
@SuppressWarnings("unchecked")
public void init() throws ServiceException {
XLog log = new XLog(LogFactory.getLog(getClass()));
log.trace("Initializing");
SERVICES = this;
try {
Class<? extends Service>[] serviceClasses =
(Class<? extends Service>[]) conf.getClasses(CONF_SERVICE_CLASSES);
if (serviceClasses != null) {
for (Class<? extends Service> serviceClass : serviceClasses) {
setService(serviceClass);
}
}
} catch (RuntimeException ex) {
XLog.getLog(getClass()).fatal(ex.getMessage(), ex);
throw ex;
} catch (ServiceException ex) {
SERVICES = null;
throw ex;
}
InstrumentationService instrService = get(InstrumentationService.class);
if (instrService != null) {
for (Service service : services.values()) {
if (service instanceof Instrumentable) {
((Instrumentable) service).instrument(instrService.get());
}
}
}
log.info("Initialized");
log.info("Oozie System ID [{0}] started!", getSystemId());
}
/**
* Get classes from a property that all implement a given interface.
*
* @param conf Configuration
* @param name String name of property to fetch.
* @param xface interface classes must implement.
* @param defaultValue If not found, return this
* @param <T> Generic type of interface class
* @return array of Classes implementing interface specified.
*/
public static <T> Class<? extends T>[] getClassesOfType(
Configuration conf, String name, Class<T> xface, Class<? extends T>... defaultValue) {
Class<?>[] klasses = conf.getClasses(name, defaultValue);
for (Class<?> klass : klasses) {
if (!xface.isAssignableFrom(klass)) {
throw new RuntimeException(klass + " is not assignable from " + xface.getName());
}
}
return (Class<? extends T>[]) klasses;
}
public static Class<?>[] getClasses(Configuration conf, String name) {
return conf.getClasses(name);
}
