FYI SIGBUS java.io.BufferedWriter.flushBuffer()V

[Michael Hall]

On Oct 17, 2011, at 5:41 AM, Michael McMahon wrote:

> What was the nature of the bug you fixed? Was there native
> code involved?

No native. I think I was just throwing prior exceptions before reaching the flush/close.

Earlier version of  the following code. I was taking similar crashes on the use of Calendar  in here that I did bug report although it seemed to duplicate another issue. Mike Swingler indicated that might be a 32 bit build compiler edge case issue? Fix that might fix this. Mostly I work/test now with JDK 6 on this code for that reason.

	public static void main(String[] args) {
		String symbol = args[0];
		String dataFormat="&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
		String yqlURL = "http://query.yahooapis.com/v1/public/yql?q=";
		String outputFileName;
		BufferedWriter writer;
		if (args.length > 1) outputFileName = args[1];
		else if (args[0].equals("%5EDJI")) outputFileName = "dow.csv";
		else outputFileName = "sp.csv";
		try {
			writer =  new BufferedWriter(new FileWriter(outputFileName,true));
		}
		catch (IOException ioex) {
			ioex.printStackTrace();
			return;
		}
		/*Get the start and end date into strings to build the query*/
		Calendar now = Calendar.getInstance();
		Calendar start = Calendar.getInstance();
		start.set(now.get(Calendar.YEAR),0,1);
		String startDate = new String(new SimpleDateFormat("yyyy-MM-dd").format(start.getTime()));
		String endDate = new String(new SimpleDateFormat("MM-dd-yyyy").format(now.getTime()));
		String trailing = "%22&format=json&env=http://datatables.org/alltables.env";
		StringBuilder sb = new StringBuilder(yqlURL);
		sb.append("select%20*%20from%20yahoo.finance.historicaldata%20where%20symbol%20in%20(%22");
		sb.append(symbol);
		sb.append("%22)%20and%20startDate=%22");
		int prefixLength = sb.length();
		char[] writeBuffer = null;
		StringBuilder csv = new StringBuilder("Date,Open,High,Low,Close,Volume,Adj Close").append(LS);
		try {
			writer.write(csv.toString());
			csv.setLength(0);
		}
		catch (IOException ioex) { ioex.printStackTrace(); }
		sb.append(startDate);
		sb.append("%22%20and%20endDate=%22");
		sb.append(endDate);
		sb.append(trailing);
		JSONObject json = RestClient.connect(sb.toString());
		if (json != null) {
			try {
				json = json.getJSONObject("query");		
				json = json.getJSONObject("results");
				JSONArray quote = json.getJSONArray("quote");
				for (int i=0;i<quote.length();i++) {
					JSONObject row = (JSONObject)quote.get(i);
					DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
					Date date = (Date)formatter.parse(row.getString("Date"));
					Calendar cal = Calendar.getInstance();
					cal.setTime(date);
					int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
					if (dayOfWeek != FRIDAY) continue;
					addCSVRow(csv,row);
				}
				if (writeBuffer == null || writeBuffer.length < csv.length())
					writeBuffer = new char[csv.length()];
				csv.getChars(0,csv.length(),writeBuffer,0);
				writer.write(writeBuffer,0,csv.length());
			}
			catch (JSONException jex) { jex.printStackTrace(); }
			catch (IOException ioex) { ioex.printStackTrace(); }
			catch (java.text.ParseException pex) { pex.printStackTrace(); }
		}
		try {
			writer.flush();
			writer.close();
		}
		catch (IOException ioex) { ioex.printStackTrace(); }
	}