private static OMMapBufferEntry mapBuffer(
final OFileMMap iFile, final long iBeginOffset, final int iSize) throws IOException {
long timer = OProfiler.getInstance().startChrono();
try {
return new OMMapBufferEntry(iFile, iFile.map(iBeginOffset, iSize), iBeginOffset, iSize);
} finally {
OProfiler.getInstance().stopChrono("OMMapManager.loadPage", timer);
}
}
private static int computeBestEntrySize(
final OFileMMap iFile,
final long iBeginOffset,
final int iSize,
final boolean iForce,
List<OMMapBufferEntry> fileEntries,
int p) {
int bufferSize;
if (p > -1 && p < fileEntries.size()) {
// GET NEXT ENTRY AS SIZE LIMIT
bufferSize = (int) (fileEntries.get(p).beginOffset - iBeginOffset);
if (bufferSize < iSize)
// ROUND TO THE BUFFER SIZE
bufferSize = iSize;
if (bufferSize < blockSize) bufferSize = blockSize;
} else {
// ROUND TO THE BUFFER SIZE
bufferSize = iForce ? iSize : iSize < blockSize ? blockSize : iSize;
if (iBeginOffset + bufferSize > iFile.getFileSize())
// REQUESTED BUFFER IS TOO LARGE: GET AS MAXIMUM AS POSSIBLE
bufferSize = (int) (iFile.getFileSize() - iBeginOffset);
}
if (bufferSize <= 0)
throw new IllegalArgumentException(
"Invalid range requested for file "
+ iFile
+ ". Requested "
+ iSize
+ " bytes from the address "
+ iBeginOffset
+ " while the total file size is "
+ iFile.getFileSize());
return bufferSize;
}