| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.apex.examples.yahoofinance; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.List; |
| |
| import javax.validation.constraints.NotNull; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.apex.malhar.lib.util.KeyValPair; |
| import org.apache.commons.httpclient.HttpClient; |
| import org.apache.commons.httpclient.HttpStatus; |
| import org.apache.commons.httpclient.cookie.CookiePolicy; |
| import org.apache.commons.httpclient.methods.GetMethod; |
| import org.apache.commons.httpclient.params.DefaultHttpParams; |
| import org.apache.hadoop.util.StringUtils; |
| |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.InputOperator; |
| import com.datatorrent.api.annotation.OutputPortFieldAnnotation; |
| |
| import au.com.bytecode.opencsv.CSVReader; |
| |
| /** |
| * This operator sends price, volume and time into separate ports and calculates incremental volume. |
| * |
| * @since 0.3.2 |
| */ |
| public class StockTickInput implements InputOperator |
| { |
| private static final Logger logger = LoggerFactory.getLogger(StockTickInput.class); |
| /** |
| * Timeout interval for reading from server. 0 or negative indicates no timeout. |
| */ |
| public int readIntervalMillis = 500; |
| /** |
| * The URL of the web service resource for the POST request. |
| */ |
| private String url; |
| private String[] symbols; |
| @NotNull |
| private String tickers; |
| private transient HttpClient client; |
| private transient GetMethod method; |
| private HashMap<String, Long> lastVolume = new HashMap<String, Long>(); |
| private boolean outputEvenIfZeroVolume = false; |
| /** |
| * The output port to emit price. |
| */ |
| @OutputPortFieldAnnotation(optional = true) |
| public final transient DefaultOutputPort<KeyValPair<String, Double>> price = new DefaultOutputPort<KeyValPair<String, Double>>(); |
| /** |
| * The output port to emit incremental volume. |
| */ |
| @OutputPortFieldAnnotation(optional = true) |
| public final transient DefaultOutputPort<KeyValPair<String, Long>> volume = new DefaultOutputPort<KeyValPair<String, Long>>(); |
| /** |
| * The output port to emit last traded time. |
| */ |
| @OutputPortFieldAnnotation(optional = true) |
| public final transient DefaultOutputPort<KeyValPair<String, String>> time = new DefaultOutputPort<KeyValPair<String, String>>(); |
| |
| /** |
| * Prepare URL from symbols and parameters. URL will be something like: http://download.finance.yahoo.com/d/quotes.csv?s=IBM,GOOG,AAPL,AABA&f=sl1vt1 |
| * |
| * @return the URL |
| */ |
| private String prepareURL() |
| { |
| String str = "http://download.finance.yahoo.com/d/quotes.csv?s="; |
| for (int i = 0; i < symbols.length; i++) { |
| if (i != 0) { |
| str += ","; |
| } |
| str += symbols[i]; |
| } |
| str += "&f=sl1vt1&e=.csv"; |
| return str; |
| } |
| |
| @Override |
| public void setup(OperatorContext context) |
| { |
| url = prepareURL(); |
| client = new HttpClient(); |
| method = new GetMethod(url); |
| DefaultHttpParams.getDefaultParams().setParameter("http.protocol.cookie-policy", CookiePolicy.BROWSER_COMPATIBILITY); |
| } |
| |
| @Override |
| public void teardown() |
| { |
| } |
| |
| @Override |
| public void emitTuples() |
| { |
| |
| try { |
| int statusCode = client.executeMethod(method); |
| if (statusCode != HttpStatus.SC_OK) { |
| logger.error("Method failed: " + method.getStatusLine()); |
| } else { |
| InputStream istream = method.getResponseBodyAsStream(); |
| // Process response |
| InputStreamReader isr = new InputStreamReader(istream); |
| CSVReader reader = new CSVReader(isr); |
| List<String[]> myEntries = reader.readAll(); |
| for (String[] stringArr: myEntries) { |
| ArrayList<String> tuple = new ArrayList<String>(Arrays.asList(stringArr)); |
| if (tuple.size() != 4) { |
| return; |
| } |
| // input csv is <Symbol>,<Price>,<Volume>,<Time> |
| String symbol = tuple.get(0); |
| double currentPrice = Double.valueOf(tuple.get(1)); |
| long currentVolume = Long.valueOf(tuple.get(2)); |
| String timeStamp = tuple.get(3); |
| long vol = currentVolume; |
| // Sends total volume in first tick, and incremental volume afterwards. |
| if (lastVolume.containsKey(symbol)) { |
| vol -= lastVolume.get(symbol); |
| } |
| |
| if (vol > 0 || outputEvenIfZeroVolume) { |
| price.emit(new KeyValPair<String, Double>(symbol, currentPrice)); |
| volume.emit(new KeyValPair<String, Long>(symbol, vol)); |
| time.emit(new KeyValPair<String, String>(symbol, timeStamp)); |
| lastVolume.put(symbol, currentVolume); |
| } |
| } |
| } |
| Thread.sleep(readIntervalMillis); |
| } catch (InterruptedException ex) { |
| logger.debug(ex.toString()); |
| } catch (IOException ex) { |
| logger.debug(ex.toString()); |
| } |
| } |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| } |
| |
| public void setOutputEvenIfZeroVolume(boolean outputEvenIfZeroVolume) |
| { |
| this.outputEvenIfZeroVolume = outputEvenIfZeroVolume; |
| } |
| |
| public void setTickers(String tickers) |
| { |
| this.tickers = tickers; |
| symbols = StringUtils.split(tickers, ','); |
| } |
| |
| public String getTickers() |
| { |
| return tickers; |
| } |
| |
| } |