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TextRecruit Ustack Core
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package com.textrecruit.ustack.data;

import java.util.ArrayList;
import java.util.List;

import com.mongodb.*;
import com.textrecruit.ustack.main.UAppCfg;
import org.apache.log4j.Logger;

import com.textrecruit.ustack.main.UOpts;

/**
 * Singleton for access to MongoDB
 * 
 * @author jdanner
 *
 */
public class MongoDB {

	private static Logger logger = Logger.getLogger(MongoDB.class);

	private static Mongo m;

	/**
	 * Direct access to the Mongo singleton
	 * 
	 * @return
	 */
	public static Mongo getMongo() { 
	
		if (m == null)
		{
			logger.info("Setup MongoDB Singleton...");
			try { 

				long start = System.currentTimeMillis();

				if (UOpts.getString(UAppCfg.MONGO_DB_CONN_STRING) != null) {

					MongoClientURI uri = new MongoClientURI(UOpts.getString(UAppCfg.MONGO_DB_CONN_STRING));
					m = new MongoClient(uri);

					logger.info("MongoDB Singleton Setup Complete - " + (System.currentTimeMillis() - start) + " ms ==> Connection String");
				} else {
					List addrs = new ArrayList();

					String connStr = UOpts.getString(UAppCfg.MONGO_DB_HOST);
					String[] split = connStr.split(",");
					for (String conn : split) {
						int idx = conn.indexOf(':');
						if (idx == -1)
							addrs.add(new ServerAddress(conn, 27017));
						else {
							String name = conn.substring(0, idx);
							String port = conn.substring(idx + 1);
							addrs.add(new ServerAddress(name, Integer.valueOf(port)));
						}
					}

					MongoClientOptions.Builder clientOpts = MongoClientOptions.builder();
					if (UOpts.getBool(UAppCfg.MONGO_DB_KEEPALIVE))
						clientOpts.socketKeepAlive(true);
					if (UOpts.getInt(UAppCfg.MONGO_DB_CONNECTIONS_PER_HOST) > 0) {
						clientOpts.connectionsPerHost(UOpts.getInt(UAppCfg.MONGO_DB_CONNECTIONS_PER_HOST));
						logger.info(String.format("MongoDB Connections Per Host: %d", UOpts.getInt(UAppCfg.MONGO_DB_CONNECTIONS_PER_HOST)));
					}

					List credentials = new ArrayList();
					if (UOpts.getString(UAppCfg.MONGO_DB_AUTH_DATABASE) != null) {
						credentials.add(MongoCredential.createCredential(UOpts.getString(UAppCfg.MONGO_DB_AUTH_USERNAME), UOpts.getString(UAppCfg.MONGO_DB_AUTH_DATABASE), UOpts.getString(UAppCfg.MONGO_DB_AUTH_PASSWORD).toCharArray()));
					}

					m = new MongoClient(addrs, credentials, clientOpts.build());
					logger.info("MongoDB Singleton Setup Complete - " + (System.currentTimeMillis() - start) + " ms ==> " + addrs);
				}


			} catch (Exception e) {
				logger.error("Failed to load mongodb : " + e.getMessage(), e);
			}
		}

		return m;
		
	}
	
	/**
	 * Returns a collection from the provided database
	 * 
	 * @param database
	 * @param collection
	 * @return
	 */
	public static DBCollection getCollection(String database, String collection)
	{
		if (database == null || collection == null)
			return null;
		
		Mongo m = getMongo();
		if (m == null)
			return null;
		DB db = m.getDB( database );
		return db.getCollection(collection);
	}

	public static void setMongo(Mongo m) {
		MongoDB.m = m;
	}
}