org.eclipse.kapua.kura.simulator.app.AbstractDefaultApplication Maven / Gradle / Ivy

/*******************************************************************************
 * Copyright (c) 2017 Red Hat Inc and others
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Red Hat Inc - initial API and implementation
 *******************************************************************************/
package org.eclipse.kapua.kura.simulator.app;

import org.eclipse.kapua.kura.simulator.payload.Message;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class AbstractDefaultApplication implements Application {

    private static final Logger logger = LoggerFactory.getLogger(AbstractDefaultApplication.class);

    private final Descriptor descriptor;

    protected abstract void processRequest(final Request request) throws Exception;

    public AbstractDefaultApplication(final String applicationId) {
        this.descriptor = new Descriptor(applicationId);
    }

    @Override
    public Descriptor getDescriptor() {
        return this.descriptor;
    }

    @Override
    public Handler createHandler(final ApplicationContext context) {
        return new Handler() {

            @Override
            public void processMessage(final Message message) {
                AbstractDefaultApplication.this.process(context, message);
            }

            @Override
            public void close() throws Exception {
                AbstractDefaultApplication.this.close();
            }
        };
    }

    protected void process(final ApplicationContext context, final Message message) {
        logger.debug("Received message: {}", message);

        final Request request;
        try {
            request = Request.parse(context, message);
        } catch (final Exception e) {
            logger.warn("Failed to parse request message", e);
            return;
        }

        logger.debug("Processing request: {}", request);

        try {
            processRequest(request);
        } catch (final Exception e) {
            logger.info("Failed to process request", e);
            request.replyError(e);
        }
    }

    protected void close() throws Exception {
    }

}