Java tutorial
/* * Copyright Andrei Goumilevski * This file licensed under GPLv3 for non commercial projects * GPLv3 text http://www.gnu.org/licenses/gpl-3.0.html * For commercial usage please contact me * gmlvsk2@gmail.com * */ package com.andreig.jetty; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.List; import java.util.logging.Logger; import com.mongodb.Mongo; import com.mongodb.MongoOptions; import com.mongodb.ServerAddress; import com.mongodb.WriteConcern; public class MongoDB { private static final Logger log = Logger.getLogger(MongoDB.class.getName()); // -------------------------------- private static List<ServerAddress> str2addresses(String servers) throws UnknownHostException { List<ServerAddress> list = new ArrayList<ServerAddress>(); servers = servers.trim(); String ar[] = servers.split("[,]"); for (String s : ar) { s = s.trim(); String ar2[] = s.split("[:]"); if (ar2 == null || ar2.length != 2) throw new IllegalArgumentException("mongo server must be <server:port>"); int port = 27017; try { port = Integer.parseInt(ar2[1]); } catch (NumberFormatException e) { log.warning("Can not parse port for " + ar[0]); } ServerAddress adr = new ServerAddress(ar2[0], port); list.add(adr); } return list; } private static Mongo db = null; static WriteConcern write_concern; // -------------------------------- public static Mongo get() { if (db == null) { try { List<ServerAddress> addrs = str2addresses(Config.mongo_servers); MongoOptions opts = new MongoOptions(); opts.autoConnectRetry = true; int thrno = Config.server_threadsno; if (thrno < 100) opts.connectionsPerHost = thrno; else opts.connectionsPerHost = 100; opts.threadsAllowedToBlockForConnectionMultiplier = 10; opts.maxWaitTime = 10000; // millisecs db = new Mongo(addrs, opts); write_concern = Config.mongo_safeoperations ? WriteConcern.FSYNC_SAFE : WriteConcern.NORMAL; log.info("getDB():" + db); } catch (UnknownHostException e) { log.severe("Bad host " + e); db = null; } } return db; } // -------------------------------- public static void close() { if (db != null) db.close(); db = null; } }