com.sun.jna.Library Java Examples

private static InvocationHandler syncWrapIfNecessary(final FbClientLibrary clientLibrary,
        final Library.Handler originalHandler) {
    if (JaybirdSystemProperties.isSyncWrapNativeLibrary()) {
        // Mimics com.sun.jna.Native.synchronizedLibrary(..) with creating a proxy
        return new InvocationHandler() {
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                synchronized (originalHandler.getNativeLibrary()) {
                    return originalHandler.invoke(clientLibrary, method, args);
                }
            }
        };
    }
    return originalHandler;
}
 

protected boolean connect() {
    try {
        if (sysLibrary == null) {
            logger.debug("Loading native code library...");
            sysLibrary = (LibK8055) Native
                    .synchronizedLibrary((Library) Native.loadLibrary("k8055", LibK8055.class));
            logger.debug("Done loading native code library");
        }

        if (!connected) {
            if (sysLibrary.OpenDevice(boardNo) == boardNo) {
                connected = true;

                // We don't really know the existing state - so this results
                // in the state of all inputs being republished
                lastDigitalInputs = -1;
                logger.info("K8055: Connect to board: " + boardNo + " succeeeded.");
            } else {
                logger.error("K8055: Connect to board: " + boardNo + " failed.");
            }
        }
        ;
    } catch (Exception e) {
        logger.error(
                "Failed to load K8055 native library.  Please check the libk8055 and jna native libraries are in the Java library path. ",
                e);
    }

    return connected;
}
 

public static < L extends Library > L loadNativeLibrary( final Class< L > library )
{
	final ArrayList< String > names = new ArrayList< String >();
	return loadNativeLibrary( names, library );
}
 

public static < L extends Library > L loadNativeLibrary( final String potentialName, final Class< L > library )
{
	final ArrayList< String > names = new ArrayList< String >();
	names.add( potentialName );
	return loadNativeLibrary( names, library );
}
 

/**
 * Creates a {@code FbClientLibrary} proxy implementing {@link FbClientFeatureAccess}.
 *
 * @param library
 *         The original {@code FbClientLibrary} proxy object
 * @return New proxy for {@code library} that implements {@link FbClientFeatureAccess}
 * @throws IllegalArgumentException
 *         if {@code library} is not a proxy with {@link Library.Handler} as its invocation handler
 */
static FbClientLibrary decorateWithFeatureAccess(FbClientLibrary library) {
    Class<?> libraryClass = library.getClass();
    if (!Proxy.isProxyClass(libraryClass)) {
        throw new IllegalArgumentException(
                "Could not decorate client library with FbClientFeatureAccess: not a proxy");
    }
    InvocationHandler ih = Proxy.getInvocationHandler(library);
    if (!(ih instanceof Library.Handler)) {
        throw new IllegalArgumentException("Could not decorate client library with FbClientFeatureAccess: "
                + "unexpected invocation handler type " + ih.getClass());
    }

    Library.Handler originalHandler = (Library.Handler) ih;
    NativeLibrary nativeLibrary = originalHandler.getNativeLibrary();
    Set<FbClientFeature> clientFeatures = determineClientFeatures(nativeLibrary);

    InvocationHandler delegatedHandler = syncWrapIfNecessary(library, originalHandler);

    FbClientFeatureAccessHandler fbClientFeatureAccessHandler =
            new FbClientFeatureAccessHandler(library, nativeLibrary, clientFeatures, delegatedHandler);

    Class<?> interfaceClass = originalHandler.getInterfaceClass();
    ClassLoader loader = interfaceClass.getClassLoader();
    Object proxy = Proxy.newProxyInstance(loader, new Class[] { interfaceClass, FbClientFeatureAccess.class },
            fbClientFeatureAccessHandler);
    return (FbClientLibrary) proxy;
}