org.apache.streams.riak.binary.RiakBinaryPersistReader.java Source code

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Here is the source code for org.apache.streams.riak.binary.RiakBinaryPersistReader.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.binary;

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

import com.basho.riak.client.api.commands.kv.FetchValue;
import com.basho.riak.client.api.commands.kv.ListKeys;
import com.basho.riak.client.api.commands.kv.MultiFetch;
import com.basho.riak.client.core.RiakFuture;
import com.basho.riak.client.core.query.Location;
import com.basho.riak.client.core.query.Namespace;
import com.google.common.collect.Queues;
import org.apache.commons.lang.NotImplementedException;
import org.joda.time.DateTime;

import java.math.BigInteger;
import java.util.Objects;
import java.util.Queue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.LinkedBlockingQueue;

/**
 * RiakBinaryPersistReader reads documents from riak via binary protocol.
 */
public class RiakBinaryPersistReader implements StreamsPersistReader {

    private RiakConfiguration configuration;
    public RiakBinaryClient client;

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

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

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

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

    @Override
    public synchronized StreamsResultSet readAll() {

        Queue<StreamsDatum> readAllQueue = constructQueue();

        Namespace ns = new Namespace(configuration.getDefaultBucketType(), configuration.getDefaultBucket());

        ListKeys lk = new ListKeys.Builder(ns).build();

        ListKeys.Response listKeysResponse = null;
        try {
            listKeysResponse = client.client().execute(lk);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

        MultiFetch multiFetch = new MultiFetch.Builder().addLocations(listKeysResponse).build();
        MultiFetch.Response multiFetchResponse = null;
        try {
            multiFetchResponse = client.client().execute(multiFetch);
        } catch (ExecutionException e) {
            e.printStackTrace();
            return null;
        } catch (InterruptedException e) {
            e.printStackTrace();
            return null;
        }

        for (RiakFuture<FetchValue.Response, Location> f : multiFetchResponse) {
            try {
                FetchValue.Response response = f.get();
                readAllQueue
                        .add(new StreamsDatum(response.getValue(String.class), f.getQueryInfo().getKeyAsString()));
            } catch (ExecutionException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        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 Objects.nonNull(client);
    }

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