private static synchronized void deleteFile(DataHandler handler, String fileName) {
// synchronize on the database, to avoid concurrent temp file creation /
// deletion / backup
synchronized (handler.getLobSyncObject()) {
FileUtils.delete(fileName);
}
}
private static String[] getFileList(DataHandler h, String dir) {
SmallLRUCache<String, String[]> cache = h.getLobFileListCache();
String[] list;
if (cache == null) {
list = FileUtils.newDirectoryStream(dir).toArray(new String[0]);
} else {
synchronized (cache) {
list = cache.get(dir);
if (list == null) {
list = FileUtils.newDirectoryStream(dir).toArray(new String[0]);
cache.put(dir, list);
}
}
}
return list;
}
/**
* Rename a map.
*
* @param map the map
* @param newName the new name
*/
public synchronized void renameMap(BTreeMap<?, ?> map, String newName) { // TODO
if (map.isInMemory()) return;
checkOpen();
String oldName = map.getName();
if (oldName.equals(newName)) {
return;
}
String fileName = (String) map.config.get("storageName");
if (fileName != null) {
fileName = fileName + File.separator + newName;
if (!FileUtils.exists(fileName)) FileUtils.createDirectories(fileName);
close();
FileUtils.move(btreeStorageName, fileName);
// btreeStorageName = fileName;
}
}
private static String getFileNamePrefix(String path, int objectId) {
String name;
int f = objectId % SysProperties.LOB_FILES_PER_DIRECTORY;
if (f > 0) {
name = SysProperties.FILE_SEPARATOR + objectId;
} else {
name = "";
}
objectId /= SysProperties.LOB_FILES_PER_DIRECTORY;
while (objectId > 0) {
f = objectId % SysProperties.LOB_FILES_PER_DIRECTORY;
name = SysProperties.FILE_SEPARATOR + f + Constants.SUFFIX_LOBS_DIRECTORY + name;
objectId /= SysProperties.LOB_FILES_PER_DIRECTORY;
}
name = FileUtils.toRealPath(path + Constants.SUFFIX_LOBS_DIRECTORY + name);
return name;
}
/**
* Create and open the storage.
*
* @param map the map to use
* @throws IllegalStateException if the file is corrupt, or an exception occurred while opening
* @throws IllegalArgumentException if the directory does not exist
*/
protected BTreeStorage(BTreeMap<Object, Object> map) {
this.map = map;
btreeStorageName = map.getBTreeStorageName();
Map<String, Object> config = map.config;
Object value = config.get("retentionTime");
retentionTime = value == null ? 45000 : (Long) value;
value = config.get("versionsToKeep");
versionsToKeep = value == null ? 5 : (Integer) value;
reuseSpace = config.containsKey("reuseSpace");
value = config.get("pageSplitSize");
pageSplitSize = value != null ? (Integer) value : (map.isInMemory() ? 4 * 1024 : 16 * 1024);
backgroundExceptionHandler =
(UncaughtExceptionHandler) config.get("backgroundExceptionHandler");
if (map.isInMemory()) {
cache = null;
compressionLevel = 0;
autoCompactFillRate = 0;
autoCommitMemory = 0;
createVersion = 0;
creationTime = getTimeAbsolute();
return;
}
value = config.get("cacheSize");
int mb = value == null ? 16 : (Integer) value;
if (mb > 0) {
CacheLongKeyLIRS.Config cc = new CacheLongKeyLIRS.Config();
cc.maxMemory = mb * 1024L * 1024L;
cache = new CacheLongKeyLIRS<BTreePage>(cc);
} else {
cache = null;
}
value = config.get("compress");
compressionLevel = value == null ? 0 : (Integer) value;
value = config.get("autoCompactFillRate");
autoCompactFillRate = value == null ? 50 : (Integer) value;
value = config.get("autoCommitBufferSize");
int kb = value == null ? 1024 : (Integer) value;
// 19 KB memory is about 1 KB storage
autoCommitMemory = kb * 1024 * 19;
lastChunkId = 0;
long createVersion = Long.MAX_VALUE;
if (!FileUtils.exists(btreeStorageName)) FileUtils.createDirectories(btreeStorageName);
String[] files = new File(btreeStorageName).list();
if (files != null && files.length > 0) {
for (String f : files) {
int id = Integer.parseInt(f.substring(0, f.length() - AOStorage.SUFFIX_AO_FILE_LENGTH));
if (id > lastChunkId) lastChunkId = id;
if (id < createVersion) createVersion = id;
}
}
if (createVersion == Long.MAX_VALUE) createVersion = 0;
this.createVersion = createVersion;
try {
if (lastChunkId > 0) readLastChunk();
} catch (IllegalStateException e) {
panic(e);
}
if (lastChunk != null) creationTime = lastChunk.creationTime;
else creationTime = getTimeAbsolute();
lastCommitTime = getTimeSinceCreation();
}
private static synchronized void renameFile(DataHandler handler, String oldName, String newName) {
synchronized (handler.getLobSyncObject()) {
FileUtils.move(oldName, newName);
}
}
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;
}