org.deeplearning4j.spark.time.TimeSourceProvider Maven / Gradle / Ivy
package org.deeplearning4j.spark.time;
import java.lang.reflect.Method;
/**
* TimeSourceProvider: used to get a TimeSource via a static method.
* Defaults to the Network Time Protocol implementation {@link NTPTimeSource}, but can be switched to other implementations
* via the {@link TimeSourceProvider#TIMESOURCE_CLASSNAME_PROPERTY} system property.
*
* @author Alex Black
*/
public class TimeSourceProvider {
/**
* Default class to use when getting a TimeSource instance
*/
public static final String DEFAULT_TIMESOURCE_CLASS_NAME = NTPTimeSource.class.getName();
/**
* Name of the system property to set if the TimeSource type/class is to be customized
*/
public static final String TIMESOURCE_CLASSNAME_PROPERTY = "org.deeplearning4j.spark.time.TimeSource";
private TimeSourceProvider() {
}
/**
* Get a TimeSource
* the default TimeSource instance (default: {@link NTPTimeSource}
*
* @return TimeSource
*/
public static TimeSource getInstance() {
String className = System.getProperty(TIMESOURCE_CLASSNAME_PROPERTY, DEFAULT_TIMESOURCE_CLASS_NAME);
return getInstance(className);
}
/**
* Get a specific TimeSource by class name
*
* @param className Class name of the TimeSource to return the instance for
* @return TimeSource instance
*/
public static TimeSource getInstance(String className) {
try {
Class c = Class.forName(className);
Method m = c.getMethod("getInstance");
return (TimeSource) m.invoke(null);
} catch (Exception e) {
throw new RuntimeException("Error getting TimeSource instance for class \"" + className + "\"", e);
}
}
}