Launching PowerScript from a Java application

Question

I am developing a Java application which at some point of its execution is intended to run a file containing PowerBuilder instructions.

First idea was to rewrite the whole file in Java, though may be there is a cleaner way to do so - this is about executing something from the Java app to launch PowerBuilder to execute the file's instructions.

The question comes to be whether there is some class or the like in Java to perform this task - I have gone unsuccessfully through some classes whose names suggested a possible solution, such as Runnable or Callable.

Should I start translating from PowerScript to Java?

Lars Juel Jensen · Accepted Answer · 2013-08-28 08:11:15Z

1

public final class PowerBuilderProcessRunner {

    private PowerBuilderProcessRunner() {}

    private static class StreamHandler implements Callable<Void> {

        private BufferedReader reader;
        private OutputStream outputStream;
        private PrintWriter writer;

        public StreamHandler(InputStream inputStream, OutputStream outputStream) {
            this.reader = new BufferedReader(new InputStreamReader(inputStream));
            this.outputStream = outputStream;
            this.writer = new PrintWriter(this.outputStream);
        }

        @Override
        public Void call() throws Exception {

            String line;
            while ((line = reader.readLine()) != null) {
                writer.println("OUTPUT FROM POWERBUILDER: " + line);
                writer.flush();
                Thread.yield();
            }

            return null;
        }

    }

    // Call this method to start powerbuilder
    public static void spawnProcess(/* arguments go here */) throws Exception {

        ProcessBuilder builder = new ProcessBuilder(
                "powerbuilder.exe", // or similar
                "arg1", // taken from arguments -> must be string
                "arg2", // taken from arguments -> must be string
        );

        Process process = builder.start();

        ExecutorService threadPool = Executors.newFixedThreadPool(2);
        threadPool.submit(new StreamHandler(process.getInputStream(), System.out));
        threadPool.submit(new StreamHandler(process.getErrorStream(), System.err));

        process.waitFor();
    }
}

answered Aug 28, 2013 at 8:11

Lars Juel Jensen

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2 Comments

Lars Juel Jensen Over a year ago

Have a look at the classes ProcessBuilder and Process from the java runtime :)

David Lopez Over a year ago

Thanks a million, Lars. Looks fantastic - and lots of new stuff for me to learn :-)

Bill the Lizard · Accepted Answer · 2014-08-05 14:10:23Z

1

Another alternative is to build the Powerscript code into a web service and invoke it thru a regular web service call.

edited Aug 5, 2014 at 14:10

Bill the Lizard

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answered Aug 28, 2013 at 19:06

NoazDad

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