MATLAB BUILDER JA 2 Podręcznik Użytkownika Pobierz pdf (Strona 73)

Managing Native Resources

The MWArray class prov ides two disposal methods: dispose and

disposeArray.ThedisposeArray method is more general in that it disposes

of either a single

MWArray or an array of arrays of type MWArray.

Code Fragment: Use try-finally to Ensure Resources A re Freed

Typically, the b est way to call the dispose method is from a finally clause

in a

try-finally block. This technique ensures that all native resources

are freed before exiting the method, even if an exception is thrown at some

point before the cleanup code.

Code Fragment: Using dispo se in a finally C la u se .

This example shows the use of dispose in a finally clause:

/* Allocate a huge array */

try

{

int[] dims = {1000, 1000};

MWNumericArray a = MWNumericArray.newInstance(dims,

MWClassID.DOUBLE, MWComplexity.REAL);

. (use the array)

}

/* Dispose of native resources */

finally

{

a.dispose();

/* Make it eligible for garbage collection */

a = null;

}

Overriding the Object.Finalize Method

You can also override the Object.Finalize method to help clean up native

resources just before garbage collection of the managed object. Refer to your

Java language reference documentation for detailed information on how to

override this method.

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MATLAB BUILDER JA 2 Podręcznik Użytkownika Strona 73