io.druid.client.RoutingDruidClient.java Source code

Introduction

Here is the source code for io.druid.client.RoutingDruidClient.java

Source

/*
 * Druid - a distributed column store.
 * Copyright (C) 2012, 2013  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package io.druid.client;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.smile.SmileFactory;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.metamx.common.logger.Logger;
import com.metamx.http.client.HttpClient;
import com.metamx.http.client.response.HttpResponseHandler;
import io.druid.guice.annotations.Client;
import io.druid.query.Query;
import io.druid.server.QueryResource;
import io.druid.server.router.Router;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.handler.codec.http.HttpHeaders;

import javax.inject.Inject;
import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.util.concurrent.atomic.AtomicInteger;

/**
 */
public class RoutingDruidClient<IntermediateType, FinalType> {
    private static final Logger log = new Logger(RoutingDruidClient.class);

    private final ObjectMapper objectMapper;
    private final HttpClient httpClient;

    private final AtomicInteger openConnections;
    private final boolean isSmile;

    @Inject
    public RoutingDruidClient(ObjectMapper objectMapper, @Router HttpClient httpClient) {
        this.objectMapper = objectMapper;
        this.httpClient = httpClient;

        this.isSmile = this.objectMapper.getFactory() instanceof SmileFactory;
        this.openConnections = new AtomicInteger();
    }

    public int getNumOpenConnections() {
        return openConnections.get();
    }

    public ListenableFuture<FinalType> postQuery(URI uri, Query query,
            HttpResponseHandler<IntermediateType, FinalType> responseHandler) {
        final ListenableFuture<FinalType> future;

        try {
            log.debug("Querying url[%s]", uri);
            future = httpClient.post(uri.toURL()).setContent(objectMapper.writeValueAsBytes(query))
                    .setHeader(HttpHeaders.Names.CONTENT_TYPE,
                            isSmile ? QueryResource.APPLICATION_SMILE : QueryResource.APPLICATION_JSON)
                    .go(responseHandler);

            openConnections.getAndIncrement();

            Futures.addCallback(future, new FutureCallback<FinalType>() {
                @Override
                public void onSuccess(FinalType result) {
                    openConnections.getAndDecrement();
                }

                @Override
                public void onFailure(Throwable t) {
                    openConnections.getAndDecrement();
                }
            });
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }

        return future;
    }

    public ListenableFuture<FinalType> get(URI uri,
            HttpResponseHandler<IntermediateType, FinalType> responseHandler) {
        try {
            return httpClient.get(uri.toURL()).go(responseHandler);
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }
    }

    public ListenableFuture<FinalType> delete(URI uri,
            HttpResponseHandler<IntermediateType, FinalType> responseHandler) {
        try {
            return httpClient.delete(uri.toURL()).go(responseHandler);
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }
    }
}