org.apache.streams.riak.http.RiakHttpPersistReader.java Source code

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Here is the source code for org.apache.streams.riak.http.RiakHttpPersistReader.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 *
 *   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 org.apache.streams.riak.http;

import org.apache.streams.core.StreamsDatum;
import org.apache.streams.core.StreamsPersistReader;
import org.apache.streams.core.StreamsResultSet;
import org.apache.streams.jackson.StreamsJacksonMapper;
import org.apache.streams.riak.pojo.RiakConfiguration;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.google.common.collect.Queues;
import org.apache.commons.lang.NotImplementedException;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.util.EntityUtils;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.math.BigInteger;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Iterator;
import java.util.Queue;
import java.util.concurrent.LinkedBlockingQueue;

/**
 * RiakHttpPersistReader reads documents from riak via http.
 */
public class RiakHttpPersistReader implements StreamsPersistReader {

    private RiakConfiguration configuration;
    private RiakHttpClient client;

    private static final Logger LOGGER = LoggerFactory.getLogger(RiakHttpPersistReader.class);

    private static final ObjectMapper MAPPER = StreamsJacksonMapper.getInstance();

    public RiakHttpPersistReader(RiakConfiguration configuration) {
        this.configuration = configuration;
    }

    @Override
    public String getId() {
        return "RiakHttpPersistReader";
    }

    @Override
    public void prepare(Object configurationObject) {
        client = RiakHttpClient.getInstance(this.configuration);
    }

    @Override
    public void cleanUp() {
        client = null;
    }

    @Override
    public StreamsResultSet readAll() {

        Queue<StreamsDatum> readAllQueue = constructQueue();

        URIBuilder lk = null;

        try {

            lk = new URIBuilder(client.baseURI.toString());
            lk.setPath(client.baseURI.getPath().concat("/buckets/" + configuration.getDefaultBucket() + "/keys"));
            lk.setParameter("keys", "true");

        } catch (URISyntaxException e) {
            LOGGER.warn("URISyntaxException", e);
        }

        HttpResponse lkResponse = null;
        try {
            HttpGet lkGet = new HttpGet(lk.build());
            lkResponse = client.client().execute(lkGet);
        } catch (IOException e) {
            LOGGER.warn("IOException", e);
            return null;
        } catch (URISyntaxException e) {
            LOGGER.warn("URISyntaxException", e);
            return null;
        }

        String lkEntityString = null;
        try {
            lkEntityString = EntityUtils.toString(lkResponse.getEntity());
        } catch (IOException e) {
            LOGGER.warn("IOException", e);
            return null;
        }

        JsonNode lkEntityNode = null;
        try {
            lkEntityNode = MAPPER.readValue(lkEntityString, JsonNode.class);
        } catch (IOException e) {
            LOGGER.warn("IOException", e);
            return null;
        }

        ArrayNode keysArray = null;
        keysArray = (ArrayNode) lkEntityNode.get("keys");
        Iterator<JsonNode> keysIterator = keysArray.iterator();

        while (keysIterator.hasNext()) {
            JsonNode keyNode = keysIterator.next();
            String key = keyNode.asText();

            URIBuilder gk = null;

            try {

                gk = new URIBuilder(client.baseURI.toString());
                gk.setPath(client.baseURI.getPath()
                        .concat("/buckets/" + configuration.getDefaultBucket() + "/keys/" + key));

            } catch (URISyntaxException e) {
                LOGGER.warn("URISyntaxException", e);
                continue;
            }

            HttpResponse gkResponse = null;
            try {
                HttpGet gkGet = new HttpGet(gk.build());
                gkResponse = client.client().execute(gkGet);
            } catch (IOException e) {
                LOGGER.warn("IOException", e);
                continue;
            } catch (URISyntaxException e) {
                LOGGER.warn("URISyntaxException", e);
                continue;
            }

            String gkEntityString = null;
            try {
                gkEntityString = EntityUtils.toString(gkResponse.getEntity());
            } catch (IOException e) {
                LOGGER.warn("IOException", e);
                continue;
            }

            readAllQueue.add(new StreamsDatum(gkEntityString, key));
        }

        return new StreamsResultSet(readAllQueue);
    }

    @Override
    public void startStream() {
        throw new NotImplementedException();
    }

    @Override
    public StreamsResultSet readCurrent() {
        throw new NotImplementedException();
    }

    @Override
    public StreamsResultSet readNew(BigInteger sequence) {
        throw new NotImplementedException();
    }

    @Override
    public StreamsResultSet readRange(DateTime start, DateTime end) {
        throw new NotImplementedException();
    }

    @Override
    public boolean isRunning() {
        return false;
    }

    private Queue<StreamsDatum> constructQueue() {
        return Queues.synchronizedQueue(new LinkedBlockingQueue<StreamsDatum>(10000));
    }
}