/*
 * Copyright IBM Corporation, 2013.  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
 */
package org.opendaylight.controller.samples.loadbalancer.internal;

import java.util.Dictionary;
import java.util.Hashtable;

import org.apache.felix.dm.Component;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.opendaylight.controller.forwardingrulesmanager.IForwardingRulesManager;
import org.opendaylight.controller.hosttracker.IfIptoHost;
import org.opendaylight.controller.sal.core.ComponentActivatorAbstractBase;
import org.opendaylight.controller.sal.packet.IDataPacketService;
import org.opendaylight.controller.sal.packet.IListenDataPacket;
import org.opendaylight.controller.sal.routing.IRouting;
import org.opendaylight.controller.samples.loadbalancer.IConfigManager;

/**
 * Main application activator class for registering the dependencies and
 * initialising the load balancer application.
 *
 */

public class Activator extends ComponentActivatorAbstractBase {

    /*
     * Logger instance
     */
    protected static final Logger logger = LoggerFactory.getLogger(Activator.class);


    /**
     * Function that is used to communicate to dependency manager the
     * list of known implementations for services inside a container
     *
     *
     * @return An array containing all the CLASS objects that will be
     * instantiated in order to get an fully working implementation
     * Object
     */
    public Object[] getImplementations() {
        Object[] res = { LoadBalancerService.class };
        return res;
    }

    /**
     * Function that is called when configuration of the dependencies
     * is required.
     *
     * @param c dependency manager Component object, used for
     * configuring the dependencies exported and imported
     * @param imp Implementation class that is being configured,
     * needed as long as the same routine can configure multiple
     * implementations
     * @param containerName The containerName being configured, this allow
     * also optional per-container different behavior if needed, usually
     * should not be the case though.
     */
    public void configureInstance(Component c, Object imp, String containerName) {
        if (imp.equals(LoadBalancerService.class)) {
            // export the service
            Dictionary<String, String> props = new Hashtable<String, String>();
            props.put("salListenerName", "loadbalancer");

            c.setInterface(new String[] { IListenDataPacket.class.getName(),
                        IConfigManager.class.getName()}, props);

            c.add(createContainerServiceDependency(containerName).setService(
                    IDataPacketService.class).setCallbacks(
                    "setDataPacketService", "unsetDataPacketService")
                    .setRequired(true));

            c.add(createContainerServiceDependency(containerName).setService(
                    IRouting.class).setCallbacks("setRouting", "unsetRouting")
                    .setRequired(false));

            c.add(createContainerServiceDependency(containerName).setService(
                    IfIptoHost.class).setCallbacks("setHostTracker",
                    "unsetHostTracker").setRequired(true));

            c.add(createContainerServiceDependency(containerName).setService(
                    IForwardingRulesManager.class).setCallbacks(
                    "setForwardingRulesManager", "unsetForwardingRulesManager")
                    .setRequired(true));
        }
    }

    /**
     * Method which tells how many Global implementations are
     * supported by the bundle. This way we can tune the number of
     * components created. This components will be created ONLY at the
     * time of bundle startup and will be destroyed only at time of
     * bundle destruction, this is the major difference with the
     * implementation retrieved via getImplementations where all of
     * them are assumed to be in a container !
     *
     *
     * @return The list of implementations the bundle will support,
     * in Global version
     */
    protected Object[] getGlobalImplementations() {
        return null;
    }

    /**
     * Configure the dependency for a given instance Global
     *
     * @param c Component assigned for this instance, this will be
     * what will be used for configuration
     * @param imp implementation to be configured
     * @param containerName container on which the configuration happens
     */
    protected void configureGlobalInstance(Component c, Object imp) {
    }
}