public virtual void TestRandomSeeks()
{
int limit = GetContract().GetLimit(TestRandomSeekCount, DefaultRandomSeekCount);
Describe("Testing " + limit + " random seeks");
int filesize = 10 * 1024;
byte[] buf = ContractTestUtils.Dataset(filesize, 0, 255);
Path randomSeekFile = Path("testrandomseeks.bin");
ContractTestUtils.CreateFile(GetFileSystem(), randomSeekFile, false, buf);
Random r = new Random();
FSDataInputStream stm = GetFileSystem().Open(randomSeekFile);
// Record the sequence of seeks and reads which trigger a failure.
int[] seeks = new int[10];
int[] reads = new int[10];
try
{
for (int i = 0; i < limit; i++)
{
int seekOff = r.Next(buf.Length);
int toRead = r.Next(Math.Min(buf.Length - seekOff, 32000));
seeks[i % seeks.Length] = seekOff;
reads[i % reads.Length] = toRead;
ContractTestUtils.VerifyRead(stm, buf, seekOff, toRead);
}
}
catch (Exception afe)
{
StringBuilder sb = new StringBuilder();
sb.Append("Sequence of actions:\n");
for (int j = 0; j < seeks.Length; j++)
{
sb.Append("seek @ ").Append(seeks[j]).Append(" ").Append("read ").Append(reads[j
]).Append("\n");
}
Log.Error(sb.ToString());
throw;
}
finally
{
stm.Close();
}
}