com.couchbase.client.QueryConnection.java Source code

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Here is the source code for com.couchbase.client.QueryConnection.java

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/**
 * Copyright (C) 2013 Couchbase, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING
 * IN THE SOFTWARE.
 */

package com.couchbase.client;

import com.couchbase.client.internal.HttpFuture;
import com.couchbase.client.io.QueryInitializer;
import com.couchbase.client.io.QueryEvent;
import com.couchbase.client.mapping.QueryResult;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import net.spy.memcached.compat.SpyObject;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class QueryConnection extends SpyObject {

    /**
     * Current default io port of the engine.
     */
    public static final int QUERY_PORT = 8093;

    /**
     * Wait N milliseconds for all connect futures to complete.
     */
    public static final int CONNECT_TIMEOUT = 5000;

    /**
     * Contains all currently connected and alive channels.
     */
    List<Channel> connectedChannels = new ArrayList<Channel>();

    private final CouchbaseConnectionFactory connectionFactory;

    EventLoopGroup group = new NioEventLoopGroup();

    public QueryConnection(List<String> nodes, CouchbaseConnectionFactory cf) {
        connectionFactory = cf;

        Class<? extends SocketChannel> channel = NioSocketChannel.class;
        Bootstrap bootstrap = new Bootstrap().group(group).channel(channel).handler(new QueryInitializer());

        List<ChannelFuture> connectFutures = new ArrayList<ChannelFuture>();
        for (String node : nodes) {
            connectFutures.add(bootstrap.connect(node, QUERY_PORT));
        }

        long startTime = System.nanoTime();
        long connectTimeout = TimeUnit.MILLISECONDS.toNanos(CONNECT_TIMEOUT);
        while (connectFutures.size() > 0 && System.nanoTime() - startTime <= connectTimeout) {
            Iterator<ChannelFuture> iterator = connectFutures.iterator();
            while (iterator.hasNext()) {
                ChannelFuture connectFuture = iterator.next();
                if (!connectFuture.isDone()) {
                    continue;
                }

                if (connectFuture.isSuccess()) {
                    connectedChannels.add(connectFuture.channel());
                } else {
                    getLogger().error("Could not connect to Query node, skipping: " + connectFuture.cause());
                }

                iterator.remove();
            }
        }

        if (connectedChannels.size() == 0) {
            throw new BootstrapException("Could not connect to at least one io node, stopping bootstrap.");
        }
    }

    public HttpFuture<QueryResult> execute(String query) {
        Channel chan = connectedChannels.get(0); // always use first channel for now

        CountDownLatch futureLatch = new CountDownLatch(1);
        HttpFuture<QueryResult> future = new HttpFuture<QueryResult>(futureLatch, 10000,
                connectionFactory.getListenerExecutorService());

        ChannelFuture channelFuture = chan.writeAndFlush(new QueryEvent<QueryResult>(query, future, futureLatch));

        final CountDownLatch latch = new CountDownLatch(1);
        channelFuture.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture channelFuture) throws Exception {
                latch.countDown();
            }
        });
        try {
            latch.await();
        } catch (InterruptedException e) {
            getLogger().warn("Got interrupted while writing Query, cancelling operation.");
            future.cancel(true);
        }

        return future;
    }

    public void shutdown() {
        try {
            group.shutdownGracefully().sync();
        } catch (InterruptedException e) {
            throw new IllegalStateException("Interrupted while shutting down.");
        }
    }

}