Added the ability to track who is throwing exceptions and how often in the core library. Uncomment to enable it.

git-svn-id: https://zxing.googlecode.com/svn/trunk@1155 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
dswitkin 2009-12-13 17:10:02 +00:00
parent fbff1b9718
commit 8ba08bb916
2 changed files with 48 additions and 0 deletions

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@ -36,14 +36,58 @@ public final class ReaderException extends Exception {
private static final ReaderException instance = new ReaderException();
// EXCEPTION TRACKING SUPPORT
// Identifies who is throwing exceptions and how often. To use:
//
// 1. Uncomment these lines and the code below which uses them.
// 2. Uncomment the two corresponding lines in j2se/CommandLineRunner.decode()
// 3. Change core to build as Java 1.5 temporarily
// private static int exceptionCount = 0;
// private static Map<String,Integer> throwers = new HashMap<String,Integer>(32);
private ReaderException() {
// do nothing
}
public static ReaderException getInstance() {
// Exception e = new Exception();
// // Take the stack frame before this one.
// StackTraceElement stack = e.getStackTrace()[1];
// String key = stack.getClassName() + "." + stack.getMethodName() + "(), line " +
// stack.getLineNumber();
// if (throwers.containsKey(key)) {
// Integer value = throwers.get(key);
// value++;
// throwers.put(key, value);
// } else {
// throwers.put(key, 1);
// }
// exceptionCount++;
return instance;
}
// public static int getExceptionCountAndReset() {
// int temp = exceptionCount;
// exceptionCount = 0;
// return temp;
// }
//
// public static String getThrowersAndReset() {
// StringBuilder builder = new StringBuilder(1024);
// Object[] keys = throwers.keySet().toArray();
// for (int x = 0; x < keys.length; x++) {
// String key = (String) keys[x];
// Integer value = throwers.get(key);
// builder.append(key);
// builder.append(": ");
// builder.append(value);
// builder.append("\n");
// }
// throwers.clear();
// return builder.toString();
// }
// Prevent stack traces from being taken
// srowen says: huh, my IDE is saying this is not an override. native methods can't be overridden?
// This, at least, does not hurt. Because we use a singleton pattern here, it doesn't matter anyhow.

View file

@ -200,6 +200,10 @@ public final class CommandLineRunner {
} catch (ReaderException e) {
System.out.println(uri.toString() + ": No barcode found");
return null;
} finally {
// Uncomment these lines when turning on exception tracking in ReaderException.
//System.out.println("Threw " + ReaderException.getExceptionCountAndReset() + " exceptions");
//System.out.println("Throwers:\n" + ReaderException.getThrowersAndReset());
}
}