/**
* Find free space for iRecordSize bytes.
*
* @param iRecordSize
* @return a pair file-id/file-pos
* @throws IOException
*/
public long[] allocateSpace(final int iRecordSize) throws IOException {
// IT'S PREFEREABLE TO FIND SPACE WITHOUT ENLARGE ANY FILES: FIND THE FIRST FILE WITH FREE SPACE
// TO USE
OFile file;
for (int i = 0; i < files.length; ++i) {
file = files[i];
if (file.getFreeSpace() >= iRecordSize)
// FOUND: RETURN THIS OFFSET
return new long[] {i, file.allocateSpace(iRecordSize)};
}
// NOT FOUND: CHECK IF CAN OVERSIZE SOME FILES
for (int i = 0; i < files.length; ++i) {
file = files[i];
if (file.canOversize(iRecordSize)) {
// FOUND SPACE: ENLARGE IT
return new long[] {i, file.allocateSpace(iRecordSize)};
}
}
// TRY TO CREATE A NEW FILE
if (maxSize > 0 && getSize() >= maxSize)
// OUT OF MAX SIZE
throw new OStorageException(
"Unable to allocate the requested space of "
+ iRecordSize
+ " bytes because the segment is full: max-Size="
+ maxSize
+ ", currentSize="
+ getFilledUpTo());
// COPY THE OLD ARRAY TO THE NEW ONE
OFile[] newFiles = new OFile[files.length + 1];
System.arraycopy(files, 0, newFiles, 0, files.length);
files = newFiles;
// CREATE THE NEW FILE AND PUT IT AS LAST OF THE ARRAY
file = createNewFile();
file.allocateSpace(iRecordSize);
config.root.update();
return new long[] {files.length - 1, 0};
}
public long allocateSpaceContinuously(final int iSize) throws IOException {
// IT'S PREFERABLE TO FIND SPACE WITHOUT ENLARGE ANY FILES: FIND THE FIRST FILE WITH FREE SPACE
// TO USE
OFile file;
int remainingSize = iSize;
// IF SOME FILES ALREADY CREATED
int offset = -1;
int fileNumber = -1;
if (files.length > 0) {
// CHECK IF THERE IS FREE SPACE IN LAST FILE IN CHAIN
file = files[files.length - 1];
if (file.getFreeSpace() > 0) {
fileNumber = files.length - 1;
if (remainingSize > file.getFreeSpace()) {
remainingSize -= file.getFreeSpace();
offset = file.allocateSpace(file.getFreeSpace());
} else {
return (long) (files.length - 1) * fileMaxSize + file.allocateSpace(remainingSize);
}
}
// NOT FOUND FREE SPACE: CHECK IF CAN OVERSIZE LAST FILE
final int oversize = fileMaxSize - file.getFileSize();
if (oversize > 0 && remainingSize > 0) {
fileNumber = files.length - 1;
if (remainingSize > oversize) {
remainingSize -= oversize;
int newOffset = file.allocateSpace(oversize);
// SAVE OFFSET IF IT WASN'T SAVED EARLIER
if (offset == -1) offset = newOffset;
} else {
int newOffset = file.allocateSpace(remainingSize);
if (offset == -1) offset = newOffset;
if (fileNumber == -1) {
fileNumber = files.length - 1;
}
return (long) fileNumber * fileMaxSize + offset;
}
}
}
// CREATE NEW FILE BECAUSE THERE IS NO FILES OR WE CANNOT ENLARGE EXISTING ENOUGH
if (remainingSize > 0) {
if (maxSize > 0 && getSize() >= maxSize)
// OUT OF MAX SIZE
throw new OStorageException(
"Unable to allocate the requested space of "
+ iSize
+ " bytes because the segment is full: max-Size="
+ maxSize
+ ", currentSize="
+ getFilledUpTo());
// COPY THE OLD ARRAY TO THE NEW ONE
OFile[] newFiles = new OFile[files.length + 1];
for (int i = 0; i < files.length; ++i) newFiles[i] = files[i];
files = newFiles;
// CREATE THE NEW FILE AND PUT IT AS LAST OF THE ARRAY
file = createNewFile();
file.allocateSpace(iSize);
config.root.update();
if (fileNumber == -1) {
fileNumber = files.length - 1;
}
if (offset == -1) offset = 0;
}
return (long) fileNumber * fileMaxSize + offset;
}
