/** Tests whether the getIterator method works as our expectation. */
@Test
public void testIterator() throws Exception {
Log log = getLog();
// Appends 100 transactions.
appendTxns(log, new Zxid(0, 0), 100);
Random rand = new Random();
Zxid begZxid = new Zxid(0, rand.nextInt(100));
Log.LogIterator iter = log.getIterator(begZxid);
// Make sure it starts from the correct zxid.
Assert.assertEquals(begZxid, iter.next().getZxid());
// Starts from negative zxid.
iter = log.getIterator(new Zxid(0, -1));
Assert.assertEquals(new Zxid(0, 0), iter.next().getZxid());
}
/** Gets transaction id of all the transactions after zxid in log. */
List<Zxid> getZxids(Log log, Zxid startZxid) throws IOException {
List<Zxid> zxids = new ArrayList<Zxid>();
try (Log.LogIterator iter = log.getIterator(startZxid)) {
while (iter.hasNext()) {
Zxid zxid = iter.next().getZxid();
zxids.add(zxid);
}
}
return zxids;
}
@Test(expected = RuntimeException.class)
public void testCorruptTxn() throws Exception {
if (logClass == (Class<?>) SimpleLog.class) {
Log log = getLog();
appendTxns(log, new Zxid(0, 0), 1);
// Corrupts Transaction.
corruptFile(20);
// Iterating the log will trigger the checksum error.
log.getIterator(log.getLatestZxid());
log.close();
} else {
throw new RuntimeException("Simulated exception for RollingLog.");
}
}