Mega Code Archive
Demonstration of speed of reflexive versus programmatic invocation
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/*
* file: ReflexiveInvocation.java
* package: oreilly.hcj.reflection
*
* This software is granted under the terms of the Common Public License,
* CPL, which may be found at the following URL:
* http://www-124.ibm.com/developerworks/oss/CPLv1.0.htm
*
* Copyright(c) 2003-2005 by the authors indicated in the @author tags.
* All Rights are Reserved by the various authors.
*
########## DO NOT EDIT ABOVE THIS LINE ########## */
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Demonstration of speed of reflexive versus programatic invocation.
*
* @author <a href=mailto:kraythe@arcor.de>Robert Simmons jr. (kraythe)</a>
* @version $Revision: 1.3 $
*/
public class ReflexiveInvocation {
/** Holds value of property value. */
private String value = "some value";
/**
* Creates a new instance of ReflexiveInvocation
*/
public ReflexiveInvocation() {
}
/**
* Main demo method.
*
* @param args
* the command line arguments
*
* @throws RuntimeException
* __UNDOCUMENTED__
*/
public static void main(final String[] args) {
try {
final int CALL_AMOUNT = 1000000;
final ReflexiveInvocation ri = new ReflexiveInvocation();
int idx = 0;
// Call the method without using reflection.
long millis = System.currentTimeMillis();
for (idx = 0; idx < CALL_AMOUNT; idx++) {
ri.getValue();
}
System.out.println("Calling method " + CALL_AMOUNT + " times programatically took "
+ (System.currentTimeMillis() - millis) + " millis");
// Call while looking up the method in each iteration.
Method md = null;
millis = System.currentTimeMillis();
for (idx = 0; idx < CALL_AMOUNT; idx++) {
md = ri.getClass().getMethod("getValue", null);
md.invoke(ri, null);
}
System.out.println("Calling method " + CALL_AMOUNT + " times reflexively with lookup took "
+ (System.currentTimeMillis() - millis) + " millis");
// Call using a cache of the method.
md = ri.getClass().getMethod("getValue", null);
millis = System.currentTimeMillis();
for (idx = 0; idx < CALL_AMOUNT; idx++) {
md.invoke(ri, null);
}
System.out.println("Calling method " + CALL_AMOUNT + " times reflexively with cache took "
+ (System.currentTimeMillis() - millis) + " millis");
} catch (final NoSuchMethodException ex) {
throw new RuntimeException(ex);
} catch (final InvocationTargetException ex) {
throw new RuntimeException(ex);
} catch (final IllegalAccessException ex) {
throw new RuntimeException(ex);
}
}
/**
* Getter for property value.
*
* @return Value of property value.
*/
public String getValue() {
return this.value;
}
}
/* ########## End of File ########## */
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