XML-RPC

XML-RPC Service uses the standard XML-RPC protocol to access remote calculations. The XML for the request is automatically generated from the provided attributes and arguments, and the response is parsed to unwrap the result of the service call.

In this example, the number of specified atoms (for example, C or O) in a SMILES string is calculated. The example service will call the following PHP code.

<?php
class TestService {
public function countAtoms($smiles, $atom) {
$count = 0;
$lastIndex = strpos($smiles, $atom);
while($lastIndex !== false) {
$count++;
if($lastIndex + 2 < strlen($smiles)) {
$next = substr($smiles, $lastIndex + 1, 1);
if(ctype_alpha($next) && $next === strtolower($next)) {
$count--; //not counting
}
}
$lastIndex = strpos($smiles, $atom, $lastIndex + 1);
}
return $count;
}
}
?>

The figure below shows the window setting.

Two running examples of calculating the number of C and O atoms in a SMILES string:

Calling XML-RPC Services from API

Here is an API example of calling XML-RPC services.

    XMLRPCServiceDescriptor descriptor = new XMLRPCServiceDescriptor();
    descriptor.setURL("http://sample.server.net/xmlrpc");
    descriptor.setMethodName("SampleService.countAtoms");

    descriptor.addArgument(ServiceArgument.createArgument(""));
    descriptor.addArgument(ServiceArgument.createArgument(""));

    Object result = null;
    try {
        result = descriptor.getServiceHandler().callService(descriptor, "C1CCNCCC1", "C");
    } catch (ServiceException e) {
        System.err.println("Service call failed.");
    }
    System.out.println("Synchronized call returned: " + String.valueOf(result));

    descriptor.getServiceHandler().callService(descriptor, new AsyncCallback<Integer>() {

        @Override
        public void onSuccess(Integer result) {
            System.out.println("Asynchronous call returned: " + result);
        }

        @Override
        public void onFailure(ServiceException caught) {
            System.err.println("Asynchronous call failed.");
        }

    }, "C1CCNCCC1", "C");