Examples of org.agilewiki.jactor.ExceptionHandler

org.agilewiki.jactor.ExceptionHandler
As responses can be received either synchronously or asynchronously, control flow can be somewhat obscure and the code to catch exceptions can be error prone. Use of an exception handler makes life simpler.

To assign an exception handler, call the setExceptionHandler method in the constructor of an actor.

If an exception occurs when processing a request, and no exception handler has been assigned, the exception is passed to the exception handler of the actor which sent the request, recursively.
```
 public class Doer extends JLPCActor { public Doer(Mailbox mailbox) { super(mailbox); } protected void processRequest(final Object request, final RP rp) throws Exception { setExceptionHandler(new ExceptionHandler() { public void process(Throwable exception) throws Exception { System.out.println("Exception caught by Doer"); rp.process(null); } }); if (request instanceof T1) { throw new Exception("Exception thrown in request processing"); } else { rp.process(request); } } } 
```

public class Driver extends JLPCActor implements GoReceiver {
    public Actor doer;


    @Override
    public void processRequest(final Go1 request, final RP rp) throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(final Throwable exception) throws Exception {
                System.out.println("Exception caught by Driver");
                rp.processResponse(null);
            }

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        send(doer, request, rp);
    }


    @Override
    public void processRequest(final Go2 request, final RP rp) throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(final Throwable exception) throws Exception {
                System.out.println("Exception caught by Driver");
                rp.processResponse(null);
            }

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     */
    @Override
    final public void acceptEvent(final APCRequestSource apcRequestSource,
            final Request request) throws Exception {
        final RequestSource rs = (RequestSource) apcRequestSource;
        final ExceptionHandler sourceExceptionHandler = rs
                .getExceptionHandler();
        final Mailbox sourceMailbox = rs.getMailbox();
        if (sourceMailbox == mailbox) {
            syncSendEvent(rs, request, sourceExceptionHandler);
            return;

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        mailbox.setCurrentRequest(jaRequest);
        try {
            setExceptionHandler(null);
            request.processRequest(this, JANoResponse.nrp);
        } catch (final Throwable ex) {
            final ExceptionHandler eh = getExceptionHandler();
            if (eh != null)
                try {
                    eh.process(ex);
                    return;
                } catch (final Throwable x) {
                    getMailboxFactory().eventException(request, x);
                }
            else {

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            if (!isActive()) {
                return;
            }
            inactive();
            final JARequest oldCurrent = mailbox.getCurrentRequest();
            final ExceptionHandler oldExceptionHandler = mailbox
                    .getExceptionHandler();
            restoreSourceMailbox();
            if (response instanceof Throwable) {
                mailbox.setCurrentRequest(oldCurrent);
                mailbox.setExceptionHandler(oldExceptionHandler);
                if (response instanceof Exception) {
                    throw (Exception) response;
                }
                throw (Error) response;
            }
            try {
                rp.processResponse(response);
            } catch (final Throwable e) {
                throw new TransparentException(e);
            }
            mailbox.setCurrentRequest(oldCurrent);
            mailbox.setExceptionHandler(oldExceptionHandler);
        } else {
            if (response instanceof Throwable) {
                Throwable ex = (Throwable) response;
                final ExceptionHandler exceptionHandler = mailbox
                        .getExceptionHandler();
                if (exceptionHandler != null) {
                    try {
                        exceptionHandler.process(ex);
                        return;
                    } catch (final Throwable x) {
                        ex = x;
                    }
                    mailbox.response(this, ex);

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        calculator.initialize(mailbox, parent);
    }


    @Override
    public void clear(final Clear request, final RP rp) throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(final Throwable exception) throws Exception {
                System.out.println("Clear => " + exception);
                rp.processResponse(null);
            }

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        });
    }


    @Override
    public void get(final Get request, final RP rp) throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(final Throwable exception) throws Exception {
                System.out.println("Get => " + exception);
                rp.processResponse(null);
            }

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        });
    }


    @Override
    public void set(final Set request, final RP rp) throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(final Throwable exception) throws Exception {
                System.out.println("Set " + request.getValue() + " => "
                        + exception);
                rp.processResponse(null);

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        });
    }


    @Override
    public void add(final Add request, final RP rp) throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(final Throwable exception) throws Exception {
                System.out.println("+ " + request.getValue() + " => "
                        + exception);
                rp.processResponse(null);

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        });
    }


    @Override
    public void subtract(final Subtract request, final RP rp) throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(final Throwable exception) throws Exception {
                System.out.println("- " + request.getValue() + " => "
                        + exception);
                rp.processResponse(null);

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