com.necla.simba.server.simbastore.server.SubscriptionManager.java Source code

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Here is the source code for com.necla.simba.server.simbastore.server.SubscriptionManager.java

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/*******************************************************************************
 *   Copyright 2015 Dorian Perkins, Younghwan Go, Nitin Agrawal, Akshat Aranya
 *
 *    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.
 *******************************************************************************/
package com.necla.simba.server.simbastore.server;

import java.nio.channels.SocketChannel;
import java.util.Collection;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.necla.simba.protocol.Server.Notification;
import com.necla.simba.protocol.Server.SimbaMessage;
import com.necla.simba.server.simbastore.server.SimbaStoreServer;
import com.necla.simba.server.simbastore.server.SubscriptionManager;

public class SubscriptionManager {
    private Multimap<String, SocketChannel> subscriptions;
    private static final Logger LOG = LoggerFactory.getLogger(SubscriptionManager.class);
    private SimbaStoreServer server;

    public SubscriptionManager(SimbaStoreServer server) {
        this.server = server;
        subscriptions = Multimaps.synchronizedSetMultimap(HashMultimap.<String, SocketChannel>create());
    }

    public boolean contains(String tableId) {
        return subscriptions.containsKey(tableId);
    }

    public void subscribe(String tableId, SocketChannel gateway) {
        subscriptions.put(tableId, gateway);
        System.out.println("subscribe: " + tableId + " (" + gateway.socket().getInetAddress().getHostName() + ")");
    }

    public void unsubscribe(String tableId, SocketChannel gateway) {
        subscriptions.remove(tableId, gateway);
        LOG.info("unsubscribe: " + tableId + " (" + gateway.socket().getInetAddress().getHostName() + ")");
    }

    public Collection<SocketChannel> getGateways(String tableId) {
        return subscriptions.get(tableId);
    }

    public void sendUpdate(String tableId, Integer version) {
        Collection<SocketChannel> gateways = subscriptions.get(tableId);
        System.out.println("gateways=" + gateways);
        if (gateways != null) {
            LOG.info("sending update: (" + tableId + "," + version + ") to " + gateways.size() + " gateways");

            // Build notification
            Notification n = Notification.newBuilder().setTable(tableId).setVersion(version).build();

            // Build simba message
            SimbaMessage m = SimbaMessage.newBuilder().setType(SimbaMessage.Type.NOTIFY).setNotify(n).build();

            for (SocketChannel channel : gateways) {
                // Enqueue notification
                server.send(channel, m.toByteString().toByteArray());
            }
        }
    }
}