| /* |
| * 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; |
| |
| import com.datatorrent.api.BaseOperator; |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.lib.util.KeyValPair; |
| import com.datatorrent.demos.frauddetect.util.JsonUtils; |
| import org.apache.commons.lang.mutable.MutableDouble; |
| import org.codehaus.jackson.JsonFactory; |
| import org.codehaus.jackson.map.ObjectMapper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.validation.constraints.NotNull; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Generate an alert if the current transaction amount received on tx input port for the given key is greater by n % |
| * than the SMA of the last application window as received on the SMA input port. |
| * |
| * @since 0.9.0 |
| */ |
| public class AverageAlertingOperator extends BaseOperator |
| { |
| private static final Logger Log = LoggerFactory.getLogger(AverageAlertingOperator.class); |
| private transient final JsonFactory jsonFactory = new JsonFactory(); |
| private transient final ObjectMapper mapper = new ObjectMapper(jsonFactory); |
| private Map<MerchantKey, MutableDouble> lastSMAMap = new HashMap<MerchantKey, MutableDouble>(); |
| private Map<MerchantKey, MutableDouble> currentSMAMap = new HashMap<MerchantKey, MutableDouble>(); |
| private List<AverageAlertData> alerts = new ArrayList<AverageAlertData>(); |
| @NotNull |
| private int threshold; |
| private static final String brickMortarAlertMsg = "Transaction amount %d exceeded by %f (last SMA %f) for Merchant %s at Terminal %d!"; |
| private static final String internetAlertMsg = "Transaction amount %d exceeded by %f (last SMA %f) for Merchant %s!"; |
| public final transient DefaultOutputPort<String> avgAlertOutputPort = new DefaultOutputPort<String>(); |
| public final transient DefaultOutputPort<Map<String, Object>> avgAlertNotificationPort = new DefaultOutputPort<Map<String, Object>>(); |
| public final transient DefaultInputPort<KeyValPair<MerchantKey, Double>> smaInputPort = |
| new DefaultInputPort<KeyValPair<MerchantKey, Double>>() |
| { |
| @Override |
| public void process(KeyValPair<MerchantKey, Double> tuple) |
| { |
| MutableDouble currentSma = currentSMAMap.get(tuple.getKey()); |
| if (currentSma == null) { // first sma for the given key |
| double sma = tuple.getValue(); |
| currentSMAMap.put(tuple.getKey(), new MutableDouble(sma)); |
| //lastSMAMap.put(tuple.getKey(), new MutableDouble(sma)); |
| } |
| else { // move the current SMA value to the last SMA Map |
| //lastSMAMap.get(tuple.getKey()).setValue(currentSma.getValue()); |
| currentSma.setValue(tuple.getValue()); // update the current SMA value |
| } |
| } |
| |
| }; |
| public final transient DefaultInputPort<KeyValPair<MerchantKey, Long>> txInputPort = |
| new DefaultInputPort<KeyValPair<MerchantKey, Long>>() |
| { |
| @Override |
| public void process(KeyValPair<MerchantKey, Long> tuple) |
| { |
| processTuple(tuple); |
| } |
| |
| }; |
| |
| private void processTuple(KeyValPair<MerchantKey, Long> tuple) |
| { |
| MerchantKey merchantKey = tuple.getKey(); |
| MutableDouble lastSma = lastSMAMap.get(tuple.getKey()); |
| long txValue = tuple.getValue(); |
| if (lastSma != null && txValue > lastSma.doubleValue()) { |
| double lastSmaValue = lastSma.doubleValue(); |
| double change = txValue - lastSmaValue; |
| if (change > threshold) { // generate an alert |
| AverageAlertData data = getOutputData(merchantKey, txValue, change, lastSmaValue); |
| alerts.add(data); |
| //if (userGenerated) { // if its user generated only the pass it to WebSocket |
| if (merchantKey.merchantType == MerchantTransaction.MerchantType.BRICK_AND_MORTAR) { |
| avgAlertNotificationPort.emit(getOutputData(data, String.format(brickMortarAlertMsg, txValue, change, lastSmaValue, merchantKey.merchantId, merchantKey.terminalId))); |
| } |
| else { // its internet based |
| avgAlertNotificationPort.emit(getOutputData(data, String.format(internetAlertMsg, txValue, change, lastSmaValue, merchantKey.merchantId))); |
| |
| } |
| //} |
| } |
| } |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| for (AverageAlertData data : alerts) { |
| try { |
| avgAlertOutputPort.emit(JsonUtils.toJson(data)); |
| } |
| catch (IOException e) { |
| logger.warn("Exception while converting object to JSON", e); |
| } |
| } |
| |
| alerts.clear(); |
| |
| for (Map.Entry<MerchantKey, MutableDouble> entry : currentSMAMap.entrySet()) { |
| MerchantKey key = entry.getKey(); |
| MutableDouble currentSma = entry.getValue(); |
| MutableDouble lastSma = lastSMAMap.get(key); |
| if (lastSma == null) { |
| lastSma = new MutableDouble(currentSma.doubleValue()); |
| lastSMAMap.put(key, lastSma); |
| } |
| else { |
| lastSma.setValue(currentSma.getValue()); |
| } |
| } |
| } |
| |
| private AverageAlertData getOutputData(MerchantKey key, long amount, double change, double lastSmaValue) |
| { |
| AverageAlertData data = new AverageAlertData(); |
| |
| data.merchantId = key.merchantId; |
| data.terminalId = key.terminalId == null ? 0 : key.terminalId; |
| data.zipCode = key.zipCode; |
| data.merchantType = key.merchantType; |
| data.amount = amount; |
| data.lastSmaValue = lastSmaValue; |
| data.change = change; |
| //data.userGenerated = userGenerated; |
| data.userGenerated = key.userGenerated; |
| data.time = System.currentTimeMillis(); |
| |
| return data; |
| } |
| |
| private Map<String, Object> getOutputData(AverageAlertData data, String msg) |
| { |
| Map<String, Object> output = new HashMap<String, Object>(); |
| output.put("message", msg); |
| output.put("alertType", "aboveAvg"); |
| output.put("userGenerated", "" + data.userGenerated); |
| output.put("alertData", data); |
| |
| try { |
| String str = mapper.writeValueAsString(output); |
| logger.debug("user generated tx alert: " + str); |
| } |
| catch (Exception exc) { |
| //ignore |
| } |
| return output; |
| } |
| |
| public int getThreshold() |
| { |
| return threshold; |
| } |
| |
| public void setThreshold(int threshold) |
| { |
| this.threshold = threshold; |
| } |
| |
| private static final Logger logger = LoggerFactory.getLogger(AverageAlertingOperator.class); |
| } |