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); } } } 
```

        });
    }


    @Override
    public void multiply(final Multiply 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 divide(final Divide 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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 * Test code.
 */
public class Actor4 extends JLPCActor {
    protected void processRequest(final Validate1 request, final RP rp)
            throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(final Throwable exception) throws Exception {
                rp.processResponse(false);
            }
        });

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    public void does(final RP rp) throws Exception {
        final String me = getActorName();
        Lock.req.send(this, this, new RP<Object>() {
            @Override
            public void processResponse(final Object response) throws Exception {
                setExceptionHandler(new ExceptionHandler() {
                    @Override
                    public void process(final Throwable exception)
                            throws Exception {
                        Unlock.req.send(Process.this, Process.this,
                                new RP<Object>() {

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     *
     * @param block The block holding the list of transactions.
     * @param rp    The RP used to signal completion.
     */
    private void processBlock(final Block block, final RP rp) throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(Exception exception) throws Exception {
                System.err.println();
                System.err.println("Log file: " + block.getFileName());
                System.err.println("block position: " + block.getCurrentPosition());

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        return (BytesJid) makeJid(key, JidFactories.BYTES_JID_TYPE);
    }


    public void checkpoint(long logPosition, long timestamp, String logFileName, RP rp)
            throws Exception {
        setExceptionHandler(new ExceptionHandler() {
            @Override
            public void process(Exception exception) throws Exception {
                if (!closed)
                    System.out.println("----> Checkpoint Exception: " + exception);
            }

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