package org.drools.grid.internal.responsehandlers;
import java.lang.reflect.Constructor;
import org.drools.grid.internal.MessageResponseHandler;
/**
* Abstract base class for client ResponseHandlers. Provides synchonized access to <field>done</field> which represents
* if the response is completed. Also has an <field>error</field> which will be set when there is a problem with
* a response. Users of this class should check to see if the response completed successfully, via
* the <method>isDone</method> and the <method>hasError</method>.
* <p/>
* Please note that the <field>error</field> is actually the Exception that occured on the server while
* processing the request.
*
* @author <a href="mailto:stampy88@yahoo.com">dave sinclair</a>
*/
public abstract class AbstractBaseResponseHandler
implements
MessageResponseHandler {
private volatile boolean done;
private RuntimeException error;
public synchronized boolean hasError() {
return this.error != null;
}
public synchronized RuntimeException getError() {
return this.error;
}
public synchronized void setError(RuntimeException error) {
this.error = error;
notifyAll();
}
public synchronized boolean isDone() {
return this.done;
}
protected synchronized void setDone(boolean done) {
this.done = done;
notifyAll();
}
/**
* This method will take the specified serverSideException, and create a new one for the client based
* on the serverSideException. This is done so a proper stack trace can be made for the client, as opposed
* to seeing the server side stack.
*
* @param serverSideException exception used to create client side exception
* @return client side exception
*/
protected static RuntimeException createSideException(RuntimeException serverSideException) {
RuntimeException clientSideException;
try {
Constructor< ? extends RuntimeException> constructor = serverSideException.getClass().getConstructor( String.class );
clientSideException = constructor.newInstance( "Server-side Exception: " + serverSideException.getMessage() );
} catch ( Exception e ) {
// this should never happen - if it does, it is a programming error
throw new RuntimeException( "Could not create client side exception",
e );
}
return clientSideException;
}
}