/** low-level test for critical performance issue described in bug [3078236] */
public void testExceptionChaining() throws SQLException {
for (boolean warn : new boolean[] {false, true}) {
long base = 0;
for (int size : new int[] {10, 25, 50, 100, 500}) {
SQLDiagnostic diag = new SQLDiagnostic(0);
System.gc();
long start = System.nanoTime();
for (int c = 0; c < size * 1000; c++) {
if (warn) {
diag.addWarning(new SQLWarning());
} else {
diag.addException(new SQLException());
}
}
long avg = (System.nanoTime() - start) / size; // nanoseconds per 1000 exceptions
// ensure time grows linear (allows factor 2 deviation, but not exponential effects)
assertTrue(
"chaining "
+ size * 1000
+ (warn ? " warnings" : " exceptions")
+ " slowed down too much ("
+ base / 1000000
+ " ms -> "
+ avg / 1000000
+ " ms per 1000)",
base == 0 || avg < base * 2);
base = base == 0 ? avg : base;
}
}
}
public SQLWarning getWarnings() throws SQLException {
checkOpen();
return messages.getWarnings();
}
public void clearWarnings() throws SQLException {
checkOpen();
messages.clearWarnings();
}
/**
* Add an SQLWarning object to the statment warnings list.
*
* @param w The SQLWarning to add.
*/
void addWarning(SQLWarning w) {
messages.addWarning(w);
}
