com.basho.riak.client.query.BucketKeyMapReduce Maven / Gradle / Ivy

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HttpClient-based client for Riak
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/*
 * This file is provided to you 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.basho.riak.client.query;

import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;


import com.basho.riak.client.IRiakClient;
import com.basho.riak.client.raw.RawClient;
import com.basho.riak.client.util.UnmodifiableIterator;
import com.fasterxml.jackson.core.JsonGenerator;

/**
 * Map/Reduce over a set of bucket/key/keydata inputs.
 * @author russell
 * @see IRiakClient#mapReduce()
 */

public class BucketKeyMapReduce extends MapReduce implements Iterable {

    private final Object inputsLock = new Object();
    private final Collection inputs = new LinkedList();

    /**
     * The {@link RawClient} to execute the Map/Reduce query
     * Use {@link IRiakClient#mapReduce()} as a factory to create your map/reduce operation.
     * @param client
     */
    public BucketKeyMapReduce(RawClient client) {
        super(client);
    }

    /**
     * Add a bucket, key, keydata to the list of inputs for the m/r query
     * 
     * @param bucket
     * @param key
     * @param keyData
     * @return this
     */
    public BucketKeyMapReduce addInput(String bucket, String key, String keyData) {
        synchronized (inputsLock) {
            inputs.add(new String[] {bucket, key, keyData});
        }

        return this;
    }

    /**
     * Add a bucket, key input to the query
     * 
     * @param bucket
     * @param key
     * @return
     */
    public BucketKeyMapReduce addInput(String bucket, String key) {
        synchronized (inputsLock) {
            inputs.add(new String[] {bucket, key});
        }

        return this;
    }

   /**
    * An {@link UnmodifiableIterator} view of the inputs for this Map/Reduce job.
    */
    public Iterator iterator() {
        final Collection inputsCopy = new LinkedList();

        synchronized (inputsLock) {
            inputsCopy.addAll(inputs);
        }

        return  new UnmodifiableIterator(inputsCopy.iterator());
    }

    /* (non-Javadoc)
     * @see com.basho.riak.newapi.query.MapReduce#writeInput(org.codehaus.jackson.JsonGenerator)
     */
    @Override protected void writeInput(final JsonGenerator jsonGenerator) throws IOException {
        jsonGenerator.writeObject(this);
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.basho.riak.client.query.MapReduce#validate()
     */
    @Override protected void validate() {
        super.validate();
        if (inputs.isEmpty()) {
            throw new NoInputsException();
        }
    }

}