demos/frauddetect/src/main/java/com/datatorrent/demos/frauddetect/operator/MongoDBOutputOperator.java

/*
 * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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.datatorrent.demos.frauddetect.operator;

import com.datatorrent.api.BaseOperator;
import com.datatorrent.api.Context;

import javax.validation.constraints.NotNull;

import com.datatorrent.api.DefaultInputPort;
import com.mongodb.*;
import com.mongodb.util.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;

/**
 * Operator to write data into MongoDB
 *
 * @since 0.9.0
 */
public class MongoDBOutputOperator extends BaseOperator {

    @NotNull
    protected String hostName;
    @NotNull
    protected String dataBase;
    @NotNull
    protected String collection;

    protected WriteConcern writeConcern = WriteConcern.ACKNOWLEDGED;

    protected String userName;
    protected String passWord;

    protected transient MongoClient mongoClient;
    protected transient DB db;
    protected transient DBCollection dbCollection;

    protected List<DBObject> dataList = new ArrayList<DBObject>();

    public MongoDBOutputOperator() {
    }

    /**
     * Take the JSON formatted string and convert it to DBObject
     */
    public transient final DefaultInputPort<String> inputPort = new DefaultInputPort<String>() {
        @Override
        public void process(String tuple) {
            dataList.add((DBObject)JSON.parse(tuple));
        }
    };

    @Override
    public void setup(Context.OperatorContext context) {
        super.setup(context);
        try {
            mongoClient = new MongoClient(hostName);
            db = mongoClient.getDB(dataBase);
            if (userName != null && passWord != null) {
                if (!db.authenticate(userName, passWord.toCharArray())) {
                    throw new IllegalArgumentException("MongoDB authentication failed. Illegal username and password for MongoDB!!");
                }
            }
            dbCollection = db.getCollection(collection);
        }
        catch (UnknownHostException ex) {
            logger.debug(ex.toString());
        }
    }

    @Override
    public void beginWindow(long windowId) {
        // nothing
    }

    @Override
    public void endWindow() {
        logger.debug("mongo datalist size: " + dataList.size());
        if (dataList.size() > 0) {
            WriteResult result = dbCollection.insert(dataList, writeConcern);
            logger.debug("Result for MongoDB insert: " + result);
            dataList.clear();
        }
    }

    @Override
    public void teardown() {
        if (mongoClient != null) {
            mongoClient.close();
        }
    }

    public String getHostName() {
        return hostName;
    }

    public void setHostName(String hostName) {
        this.hostName = hostName;
    }

    public String getDataBase() {
        return dataBase;
    }

    public void setDataBase(String dataBase) {
        this.dataBase = dataBase;
    }

    public String getCollection() {
        return collection;
    }

    public void setCollection(String collection) {
        this.collection = collection;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public WriteConcern getWriteConcern() {
        return writeConcern;
    }

    public void setWriteConcern(WriteConcern writeConcern) {
        this.writeConcern = writeConcern;
    }

    private static final Logger logger = LoggerFactory.getLogger(MongoDBOutputOperator.class);
}