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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

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/*
 * Copyright (c) Corporation for National Research Initiatives
 * Copyright (c) Jython Developers
 */
package org.python.modules;

import org.python.core.__builtin__;
import org.python.core.PyDictionary;
import org.python.core.PyObject;
import org.python.core.PyMethod;
import org.python.core.Py;
import org.python.core.Traverseproc;
import org.python.core.Visitproc;


public class synchronize {

    public static Object _getSync(PyObject obj) {
        return Py.tojava(obj, Object.class);
    }

    public static PyObject apply_synchronized(PyObject syncObject, PyObject callable,
                                              PyObject args) {
        synchronized (_getSync(syncObject)) {

            return __builtin__.apply(callable, args);
        }
    }
    public static PyObject apply_synchronized(PyObject syncObject, PyObject callable,
                                              PyObject args, PyDictionary kws) {
        synchronized (_getSync(syncObject)) {
            return __builtin__.apply(callable, args, kws);
        }
    }

    public static PyObject make_synchronized(PyObject callable) {
        return new SynchronizedCallable(callable);
    }

    public static class SynchronizedCallable extends PyObject implements Traverseproc {

        PyObject callable;

        public SynchronizedCallable(PyObject callable) {
            this.callable = callable;
        }

        @Override
        public PyObject __get__(PyObject obj, PyObject type) {
            return new PyMethod(this, obj, type);
        }

        @Override
        public PyObject __call__() {
            throw Py.TypeError("synchronized callable called with 0 args");
        }

        @Override
        public PyObject __call__(PyObject arg) {
            synchronized (synchronize._getSync(arg)) {
                return callable.__call__(arg);
            }
        }

        @Override
        public PyObject __call__(PyObject arg1, PyObject arg2) {
            synchronized (synchronize._getSync(arg1)) {
                return callable.__call__(arg1, arg2);
            }
        }

        @Override
        public PyObject __call__(PyObject arg1, PyObject arg2, PyObject arg3) {
            synchronized (synchronize._getSync(arg1)) {
                return callable.__call__(arg1, arg2, arg3);
            }
        }

        @Override
        public PyObject __call__(PyObject[] args, String[] keywords) {
            if (args.length == 0) {
                throw Py.TypeError("synchronized callable called with 0 args");
            }
            synchronized (synchronize._getSync(args[0])) {
                return callable.__call__(args, keywords);
            }
        }

        @Override
        public PyObject __call__(PyObject arg1, PyObject[] args, String[] keywords) {
            synchronized (synchronize._getSync(arg1)) {
                return callable.__call__(arg1, args, keywords);
            }
        }

        @Override
        public boolean isCallable() {
            return true;
        }


        /* Traverseproc implementation */
        @Override
        public int traverse(Visitproc visit, Object arg) {
            return callable != null ? visit.visit(callable, arg) : 0;
        }

        @Override
        public boolean refersDirectlyTo(PyObject ob) {
            return ob != null && ob == callable;
        }
    }
}