org.dawnsci.commandserver.jython.JythonConsumer.java Source code

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Here is the source code for org.dawnsci.commandserver.jython.JythonConsumer.java

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/*
 * Copyright (c) 2012 Diamond Light Source Ltd.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.dawnsci.commandserver.jython;

import java.io.FileNotFoundException;
import java.net.URI;
import java.net.URL;

import org.dawnsci.commandserver.core.beans.StatusBean;
import org.dawnsci.commandserver.core.process.ProgressableProcess;
import org.dawnsci.commandserver.core.producer.ProcessConsumer;
import org.python.util.PythonInterpreter;

import uk.ac.diamond.scisoft.python.JythonInterpreterUtils;

public class JythonConsumer extends ProcessConsumer {

    protected PythonInterpreter interpreter;

    @Override
    protected Class<? extends StatusBean> getBeanClass() {
        return JythonBean.class;
    }

    @Override
    public void start() throws Exception {
        //This starts the interpreter for script submission (Borrowed from org.dawb.passerelle.actors.scripts.PythonScript)

        //All set? Let's go!
        interpreter = JythonInterpreterUtils.getFullInterpreter(null, "com.fasterxml.jackson.core",
                "org.dawnsci.persistence");

        //Get shared python functions and pass in as a stream.
        URL pySOURL = this.getClass().getResource("python_funcs.py");
        if (pySOURL == null) {
            throw new FileNotFoundException("python_funcs.py (resource not found)");
        }
        interpreter.execfile(pySOURL.openStream());

        System.out.println("Jython interpreter started.");

        //This after other setup as this just sits and sits and...
        super.start();
    }

    @Override
    public void stop() throws Exception {
        //Need to kill the interpreter when stopping the Consumer
        interpreter.eval("exit()");
        System.out.println("Jython interpreter stopped.");

        super.stop();
    }

    @Override
    protected ProgressableProcess createProcess(URI uri, String statusTName, String statusQName, StatusBean bean)
            throws Exception {
        return new JythonProcess(uri, statusTName, statusQName, config, (JythonBean) bean, interpreter);
    }

    private static final long TWO_DAYS = 48 * 60 * 60 * 1000; // ms

    @Override
    protected long getMaximumRunningAge() {
        if (System.getProperty("org.dawnsci.commandserver.core.maximumJythonRunningAge") != null) {
            return Long.parseLong(System.getProperty("org.dawnsci.commandserver.core.maximumJythonRunningAge"));
        }
        return TWO_DAYS;
    }

    private static final long A_WEEK = 7 * 24 * 60 * 60 * 1000; // ms

    @Override
    protected long getMaximumCompleteAge() {
        if (System.getProperty("org.dawnsci.commandserver.core.maximumJythonCompleteAge") != null) {
            return Long.parseLong(System.getProperty("org.dawnsci.commandserver.core.maximumJythonCompleteAge"));
        }
        return A_WEEK;
    }

    @Override
    public String getName() {
        return "Jython VM";
    }

}