// FEATURE: 300792
public LogRecord getNext(LogRecord lr) throws InvalidLogBufferException, LogException {
if (lr == null || lr.buffer == null) throw new IllegalArgumentException();
LogBuffer buffer = lr.buffer;
// get next record
lr.get(buffer);
if (lr.isEOB()) {
long bsn = buffer.bsn; // so we can test for wraparound
try {
lfmgr.read(buffer, buffer.bsn + 1);
} catch (IOException e) {
LogFile lf = lr.buffer.lf;
String msg = "Error reading " + lf.file + " @ position [" + lf.position + "]";
throw new LogException(msg, e);
}
if (buffer.bsn == -1 || buffer.bsn < bsn) // BUG 304982
{
lr.type = LogRecordType.END_OF_LOG;
return lr;
}
lr.get(buffer);
}
return lr;
}
// FEATURE: 300792
public LogRecord get(LogRecord lr, long mark)
throws InvalidLogKeyException, LogConfigurationException, LogException,
InvalidLogBufferException {
/* this code is similar to LogBufferManager.replay() -- potential for refactor */
int bsn = bmgr.bsnFromMark(mark);
if (mark < 0 || (bsn == 0 && mark != 0))
throw new InvalidLogKeyException(Long.toHexString(mark));
if (lr == null)
lr = new LogRecord((config.getBufferSize() * 1024) / 4); // default to 1/4 buffer size
// allocate a LogBuffer that we can use to read the journal
try {
if (lr.buffer == null) lr.buffer = bmgr.getLogBuffer(-1);
} catch (ClassNotFoundException e) {
throw new LogConfigurationException(e);
}
LogBuffer buffer = lr.buffer;
// read block containing requested mark
try {
bmgr.forceCurrentBuffer();
lfmgr.read(buffer, bsn);
} catch (IOException e) {
LogFile lf = buffer.lf;
String msg = "Error reading " + lf.file + " @ position [" + lf.position + "]";
throw new LogException(msg, e);
}
if (buffer.bsn == -1) {
lr.type = LogRecordType.END_OF_LOG;
return lr;
}
// verify we have the desired block
// if requested mark == 0 then we start with the oldest block available
int markBSN = (mark == 0) ? buffer.bsn : bmgr.bsnFromMark(mark);
if (markBSN != buffer.bsn) {
InvalidLogBufferException lbe =
new InvalidLogBufferException(
"block read [" + buffer.bsn + "] not block requested: " + markBSN);
throw lbe;
}
/*
* position buffer to requested mark.
*
* Although the mark contains a buffer offset, we search forward
* through the buffer to guarantee that we have the start
* of a record. This protects against using marks that were
* not generated by the current Logger.
*/
lr.get(buffer); // get first record in buffer
if (mark > 0 && mark > bmgr.markFromBsn(markBSN, 0)) {
while (lr.key < mark) {
lr.get(buffer);
}
if (lr.key != mark) {
String msg =
"The requested mark [" + Long.toHexString(mark) + "] was not found in the log.";
// BUG 300733 following line changed to throw an exception
throw new InvalidLogKeyException(msg);
}
}
return lr;
}
