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Java Tip 13: Speed <em>and</em> portability
How to use native methods without restricting class usability
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public void convolve() {
if (_native)
nativeConvolve();
else
fallbackConvolve();
}
private native void nativeConvolve();
private void fallbackConvolve() {
...
}
In this example, a convolution operation can be performed either by native method nativeConvolve or by fallback method fallbackConvolve. The distinction between these two methods is irrelevant to the class user, who simply invokes convolve to perform the operation. If the dynamic library has been installed, the user gets the benefits of faster execution; if the
dynamic library is unavailable, the operation can still be carried out, albeit more slowly.
That's all there is to it! Once you've written and compiled your class, you add the native method support in the normal way. (See the current version of Sun's Java Tutorial for an explanation of how to do this.)
About the author
Nick Efford is a lecturer at the School of Computer Studies at the University of Leeds, U.K. Nick's research has been concerned mainly with the knowledge-based segmentation of medical images and the identification of objects of interest, using 2-D and 3-D models of object shape. Nick currently teaches image processing at the School of Computer Studies.- Feedback
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