private static String getFileName(DataHandler handler, int tableId, int objectId) {
if (SysProperties.CHECK && tableId == 0 && objectId == 0) {
DbException.throwInternalError("0 LOB");
}
String table = tableId < 0 ? ".temp" : ".t" + tableId;
return getFileNamePrefix(handler.getDatabasePath(), objectId)
+ table
+ Constants.SUFFIX_LOB_FILE;
}
private FileStoreOutputStream initLarge(DataHandler h) {
this.handler = h;
this.tableId = 0;
this.linked = false;
this.precision = 0;
this.small = null;
this.hash = 0;
String compressionAlgorithm = h.getLobCompressionAlgorithm(type);
this.compressed = compressionAlgorithm != null;
synchronized (h) {
String path = h.getDatabasePath();
if ((path != null) && (path.length() == 0)) {
path =
new File(Utils.getProperty("java.io.tmpdir", "."), SysProperties.PREFIX_TEMP_FILE)
.getAbsolutePath();
}
objectId = getNewObjectId(h);
fileName = getFileNamePrefix(path, objectId) + Constants.SUFFIX_TEMP_FILE;
tempFile = h.openFile(fileName, "rw", false);
tempFile.autoDelete();
}
FileStoreOutputStream out = new FileStoreOutputStream(tempFile, h, compressionAlgorithm);
return out;
}
private static int getNewObjectId(DataHandler h) {
String path = h.getDatabasePath();
if ((path != null) && (path.length() == 0)) {
path =
new File(Utils.getProperty("java.io.tmpdir", "."), SysProperties.PREFIX_TEMP_FILE)
.getAbsolutePath();
}
int newId = 0;
int lobsPerDir = SysProperties.LOB_FILES_PER_DIRECTORY;
while (true) {
String dir = getFileNamePrefix(path, newId);
String[] list = getFileList(h, dir);
int fileCount = 0;
boolean[] used = new boolean[lobsPerDir];
for (String name : list) {
if (name.endsWith(Constants.SUFFIX_DB_FILE)) {
name = FileUtils.getName(name);
String n = name.substring(0, name.indexOf('.'));
int id;
try {
id = Integer.parseInt(n);
} catch (NumberFormatException e) {
id = -1;
}
if (id > 0) {
fileCount++;
used[id % lobsPerDir] = true;
}
}
}
int fileId = -1;
if (fileCount < lobsPerDir) {
for (int i = 1; i < lobsPerDir; i++) {
if (!used[i]) {
fileId = i;
break;
}
}
}
if (fileId > 0) {
newId += fileId;
invalidateFileList(h, dir);
break;
}
if (newId > Integer.MAX_VALUE / lobsPerDir) {
// this directory path is full: start from zero
newId = 0;
dirCounter = MathUtils.randomInt(lobsPerDir - 1) * lobsPerDir;
} else {
// calculate the directory.
// start with 1 (otherwise we don't know the number of
// directories).
// it doesn't really matter what directory is used, it might as
// well be random (but that would generate more directories):
// int dirId = RandomUtils.nextInt(lobsPerDir - 1) + 1;
int dirId = (dirCounter++ / (lobsPerDir - 1)) + 1;
newId = newId * lobsPerDir;
newId += dirId * lobsPerDir;
}
}
return newId;
}
