flens.query.AMQPQueryDispatcher.java Source code

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Here is the source code for flens.query.AMQPQueryDispatcher.java

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/**
 *
 *     Copyright 2013 KU Leuven Research and Development - iMinds - Distrinet
 *
 *     Licensed under the Apache License, Version 2.0 (the "License");
 *     you may not use this file except in compliance with the License.
 *     You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 *
 *     Administrative Contact: dnet-project-office@cs.kuleuven.be
 *     Technical Contact: wouter.deborger@cs.kuleuven.be
 */
package flens.query;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import dnet.monitor.control.FactsHandler;
import dnet.monitor.control.PingHandler;
import dnet.monitor.control.amqp.CommandHandler;
import dnet.monitor.control.amqp.CommandServer;
import flens.core.ConfigHandler;
import flens.core.Flengine;
import flens.core.GenericQueryTerm;
import flens.core.Matcher;
import flens.core.Query;
import flens.core.QueryHandler;
import flens.core.Util;
import flens.core.util.AbstractPlugin;

/**
 * @author wouterdb
 * 
 * 
 *         misuse query handler interface for query server, ....
 */
public class AMQPQueryDispatcher extends AbstractPlugin implements QueryHandler {

    private Flengine engine;
    private ConnectionFactory factory;
    private CommandServer cs;
    private String name;
    private Connection conn;

    public AMQPQueryDispatcher(Flengine engine, String name, String host, int port, String vhost, String user,
            String pass) {
        this.engine = engine;
        this.name = name;
        factory = new ConnectionFactory();
        factory.setHost(host);
        factory.setPort(port);
        factory.setUsername(user);
        factory.setPassword(pass);
        if (vhost != null)
            factory.setVirtualHost(vhost);

    }

    @Override
    public boolean canHandle(Query q) {
        return false;
    }

    @Override
    public void handle(Query q) {
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public void start() {
        GenericQueryTerm qt = new GenericQueryTerm(engine);

        ConfigHandler ch = new ConfigHandler(engine);

        List<CommandHandler> chs = new LinkedList<>();
        chs.add(new PingHandler());
        chs.add(new FactsHandler());
        chs.add(ch);
        chs.add(qt);

        try {
            conn = factory.newConnection();
            cs = new CommandServer(Util.hostName(), conn, engine.getTags(), chs);
            cs.enableHelp();
            cs.start();
        } catch (IOException e) {
            err("could not start command server ", e);
        }

    }

    @Override
    public void stop() {
        try {
            conn.close();
        } catch (IOException e) {
            err("could not stop command server ", e);
        }
    }

    @Override
    public void join() {

    }

}