Examples of ptolemy.kernel.util.Workspace

ptolemy.kernel.util.Workspace
code that reads } finally { _workspace.doneReading(); } We assume that the _workspace variable references the workspace, as for example in the NamedObj class. The getReadAccess() method suspends the current thread if another thread is currently modifying the workspace, and otherwise returns immediately. Note that multiple readers can simultaneously have read access. The finally clause is executed even if an exception occurs. This is essential because without the call to doneReading(), the workspace will never again allow any thread to modify it.
To make safe changes to the objects in a workspace, a thread must write-synchronize using the following code:
```
 try { _workspace.getWriteAccess(); // ... code that writes } finally { _workspace.doneWriting(); } 
```
Again, the call to doneWriting() is essential, or the workspace will remain permanently locked to either reading or writing.
Note that it is not necessary to obtain a write lock just to add an item to the workspace directory. The methods for accessing the directory are all synchronized, so there is no risk of any thread reading an inconsistent state. @author Edward A. Lee, Mudit Goel, Lukito Muliadi, Xiaojun Liu @version $Id: Workspace.java,v 1.108 2006/09/21 15:45:37 cxh Exp $ @since Ptolemy II 0.2 @Pt.ProposedRating Green (liuxj) @Pt.AcceptedRating Green (liuxj)

    /**
     */
    public static void main(String[] args) throws IllegalActionException,
            IllegalStateException, NameDuplicationException {
        // Set up Manager, Director and top level CompositeActor
        Workspace workSpc = new Workspace();
        TypedCompositeActor topLevelActor = new TypedCompositeActor(workSpc);
        topLevelActor.setName("universe");


        Manager manager = new Manager(workSpc, "manager");
        DDEDirector director = new DDEDirector(topLevelActor, "director");

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    public boolean loadMoML(String moml) throws java.rmi.RemoteException {
        if (VERBOSE) {
            System.out.println("Loading: " + moml);
        }


        momlParser = new MoMLParser(new Workspace());
        compositeActor = null;


        String processedMoML = processMoML(moml);


        try {

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                            + "class definition");
        }


        // Use the workspace of the container, if there is one,
        // or the workspace of this object, if there isn't.
        Workspace workspace = workspace();


        if (container != null) {
            workspace = container.workspace();
        }

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     *  @return Return true if the get() method of this receiver will
     *   return a token without throwing a NoTokenException.  Return
     *   false if the current thread is not a DDEThread.
     */
    public boolean hasToken() {
        Workspace workspace = getContainer().workspace();
        Thread thread = Thread.currentThread();


        if (!(thread instanceof DDEThread)) {
            return false;
        }


        TimeKeeper timeKeeper = ((DDEThread) thread).getTimeKeeper();


        boolean sendNullTokens = false;


        synchronized (_director) {
            //////////////////////
            // Update the ReceiverList
            //////////////////////
            timeKeeper.updateReceiverList(this);


            /////////////////////////////////////////
            // Determine if this Receiver is in Front
            /////////////////////////////////////////
            if (this != timeKeeper.getFirstReceiver()) {
                return false;
            }


            //////////////////////////////////////////
            // Determine if the TimeKeeper is inactive
            //////////////////////////////////////////
            if (timeKeeper.getNextTime().getDoubleValue() == INACTIVE) {
                requestFinish();
            }


            ///////////////////
            // Check Receiver Times
            ///////////////////
            if ((getReceiverTime().getDoubleValue() == IGNORE) && !_terminate) {
                timeKeeper.removeAllIgnoreTokens();


                sendNullTokens = true;
            }


            ///////////////////////////
            // Check Token Availability
            ///////////////////////////
            if (super.hasToken() && !_terminate && !sendNullTokens) {
                if (!_hasNullToken()) {
                    _hasTokenCache = true;
                    return true;
                } else {
                    // Treat Null Tokens Normally For Feedback
                    if (!_hideNullTokens) {
                        _hasTokenCache = true;
                        return true;
                    }


                    // Deal With Null Tokens Separately
                    super.get();
                    sendNullTokens = true;
                }
            }


            ////////////////////////
            // Perform Blocking Read
            ////////////////////////
            if (!super.hasToken() && !_terminate && !sendNullTokens) {
                _readPending = thread;
                _director.threadBlocked(thread, this, DDEDirector.READ_BLOCKED);


                while ((_readPending != null) && !_terminate) {
                    try {
                        workspace.wait(_director);
                    } catch (InterruptedException e) {
                        _terminate = true;
                        break;
                    }
                }

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     *  @param time The specified time stamp.
     *  @exception TerminateProcessException If activity is scheduled
     *   to cease.
     */
    public void put(Token token, Time time) {
        Workspace workspace = getContainer().workspace();


        synchronized (_director) {
            if ((time.compareTo(_getCompletionTime()) > 0)
                    && (_getCompletionTime().getDoubleValue() != ETERNITY)
                    && !_terminate) {
                try {
                    time = new Time(_director, INACTIVE);
                } catch (IllegalActionException e) {
                    // If the time resolution of the director is invalid,
                    // it should have been caught before this.
                    throw new InternalErrorException(e);
                }
            }


            if (super.hasRoom() && !_terminate) {
                super.put(token, time);


                // If any thread is blocked on a get(), then it will become
                // unblocked. Notify the director now so that there isn't a
                // spurious deadlock detection.
                if (_readPending != null) {
                    _director.threadUnblocked(_readPending, this,
                            DDEDirector.READ_BLOCKED);
                    _readPending = null;
                }


                return;
            }


            if (!super.hasRoom() && !_terminate) {
                _writePending = Thread.currentThread();
                _director.threadBlocked(_writePending, this,
                        DDEDirector.WRITE_BLOCKED);


                while ((_writePending != null) && !_terminate) {
                    try {
                        workspace.wait(_director);
                    } catch (InterruptedException e) {
                        _terminate = true;
                        break;
                    }
                }

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 */
public class Iterations {
    private Recorder _recorder;


    public Iterations() throws KernelException {
        Workspace w = new Workspace("w");
        TypedCompositeActor toplevel = new TypedCompositeActor(w);
        toplevel.setName("toplevel");


        DEDirector director = new DEDirector(toplevel, "director");

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 @Pt.AcceptedRating Red (cxh)
 */
public class Time {
    public static void main(String[] arg) throws IllegalActionException,
            NameDuplicationException {
        Workspace w = new Workspace("w");
        TypedCompositeActor toplevel = new TypedCompositeActor(w);
        toplevel.setName("toplevel");


        DEDirector director = new DEDirector(toplevel, "director");

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     */
    public String checkCopy(String momlToBeChecked, NamedObj container)
            throws IllegalActionException {


        _variableBuffer = new StringWriter();
        Workspace workspace = new Workspace("copyWorkspace");
        MoMLParser parser = new MoMLParser(workspace);
        TypedCompositeActor parsedContainer = null;


        // Attempt to parse the moml.  If we fail, check the exception
        // for a missing variable.  If a missing variable is found

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        TestWorkspace6 tw = new TestWorkspace6();
        tw.runTest();
    }


    public void initializeTest() {
        Workspace workspace = new Workspace();
        List actions = new LinkedList();
        AccessAction action = new AccessAction(workspace, 0, 'R', 0, null,
                _record, "A0");
        actions.add(action);
        action = new AccessAction(workspace, 0, 'R', 0, null, _record, "A1");

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 @Pt.AcceptedRating Red (cxh)


 */
public class TestWorkspace3 extends TestWorkspaceBase {
    public void initializeTest() {
        Workspace workspace = new Workspace();
        List actions = new LinkedList();
        AccessAction action = new AccessAction(workspace, 0, 'R', 1000, null,
                _record, "A1");
        actions.add(action);
        action = new AccessAction(workspace, 0, 'W', 1000, null, _record, "A2");

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