001/** 002 * Copyright (c) 2011, The University of Southampton and the individual contributors. 003 * All rights reserved. 004 * 005 * Redistribution and use in source and binary forms, with or without modification, 006 * are permitted provided that the following conditions are met: 007 * 008 * * Redistributions of source code must retain the above copyright notice, 009 * this list of conditions and the following disclaimer. 010 * 011 * * Redistributions in binary form must reproduce the above copyright notice, 012 * this list of conditions and the following disclaimer in the documentation 013 * and/or other materials provided with the distribution. 014 * 015 * * Neither the name of the University of Southampton nor the names of its 016 * contributors may be used to endorse or promote products derived from this 017 * software without specific prior written permission. 018 * 019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 029 */ 030package org.openimaj.demos.sandbox.ml.linear.learner.stream; 031 032import java.net.UnknownHostException; 033import java.util.List; 034 035import org.openimaj.util.function.Operation; 036 037import com.mongodb.DB; 038import com.mongodb.DBCollection; 039import com.mongodb.DBObject; 040import com.mongodb.MongoClient; 041import com.mongodb.ServerAddress; 042 043/** 044 * Writes items from a stream of a mongodb instance 045 * @author Sina Samangooei (ss@ecs.soton.ac.uk) 046 * @param <T> 047 * 048 */ 049public abstract class MongoDBOutputOp<T> implements Operation<T> { 050 051 private MongoClient mongoClient; 052 private DB db; 053 private DBCollection collection; 054 055 056 /** 057 * @throws UnknownHostException 058 * 059 */ 060 public MongoDBOutputOp() throws UnknownHostException { 061 setup("localhost"); 062 } 063 064 /** 065 * @param seeds 066 * @throws UnknownHostException 067 * 068 */ 069 public MongoDBOutputOp(List<ServerAddress> seeds) throws UnknownHostException { 070 this.mongoClient = new MongoClient(seeds); 071 this.db = mongoClient.getDB( getDBName() ); 072 this.collection = db.getCollection(getCollectionName()); 073 } 074 075 private void setup(String host) throws UnknownHostException { 076 this.mongoClient = new MongoClient( host); 077 this.db = mongoClient.getDB( getDBName() ); 078 this.collection = db.getCollection(getCollectionName()); 079 } 080 081 /** 082 * @return the database name 083 */ 084 public abstract String getDBName() ; 085 086 /** 087 * @return the name of the collection to add items to 088 */ 089 public abstract String getCollectionName() ; 090 091 @Override 092 public void perform(T object) { 093 DBObject asDBObject = asDBObject(object); 094 this.collection.insert(asDBObject); 095 } 096 097 /** 098 * @param obj 099 * @return The DBObject to save to MongoDB 100 */ 101 public abstract DBObject asDBObject(T obj) ; 102 103}