private void openEnvironment(File file) throws DatabaseInitException {
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setCachePercent(30);
envConfig.setAllowCreate(true);
envConfig.setTransactional(true);
envConfig.setTxnTimeout(10, TimeUnit.SECONDS);
envConfig.setLockTimeout(2000, TimeUnit.MILLISECONDS);
try {
environment = new Environment(file, envConfig);
transactionConfig = new TransactionConfig();
transactionConfig.setReadCommitted(true);
cursorConfig = new CursorConfig();
cursorConfig.setReadCommitted(true);
} catch (EnvironmentLockedException e) {
String message =
"Environment locked exception. Another process is using the same database, or the current user has no write access (database location: \""
+ file.getAbsolutePath()
+ "\")";
throw new DatabaseInitException(message);
} catch (DatabaseException e) {
String message = "A database initialisation error has occured (" + e.getMessage() + ")";
throw new DatabaseInitException(message);
}
}
@Override
protected List<ObjectId> lookUpInternal(final byte[] partialId) {
DatabaseEntry key;
{
byte[] keyData = partialId.clone();
key = new DatabaseEntry(keyData);
}
DatabaseEntry data = new DatabaseEntry();
data.setPartial(0, 0, true); // do not retrieve data
List<ObjectId> matches;
CursorConfig cursorConfig = new CursorConfig();
cursorConfig.setReadCommitted(true);
cursorConfig.setReadUncommitted(false);
Cursor cursor = objectDb.openCursor(txn.getTransaction(), cursorConfig);
try {
// position cursor at the first closest key to the one looked up
OperationStatus status = cursor.getSearchKeyRange(key, data, LockMode.DEFAULT);
if (SUCCESS.equals(status)) {
matches = new ArrayList<ObjectId>(2);
final byte[] compKey = new byte[partialId.length];
while (SUCCESS.equals(status)) {
byte[] keyData = key.getData();
System.arraycopy(keyData, 0, compKey, 0, compKey.length);
if (Arrays.equals(partialId, compKey)) {
matches.add(new ObjectId(keyData));
} else {
break;
}
status = cursor.getNext(key, data, LockMode.DEFAULT);
}
} else {
matches = Collections.emptyList();
}
return matches;
} finally {
cursor.close();
}
}
/** Constructor helper. */
private void init(DataView view, boolean writeAllowed, CursorConfig config, KeyRange range)
throws DatabaseException {
if (config == null) {
config = view.cursorConfig;
}
this.view = view;
this.writeAllowed = writeAllowed && view.writeAllowed;
this.range = (range != null) ? range : view.range;
readUncommitted = config.getReadUncommitted() || view.currentTxn.isReadUncommitted();
initThangs();
if (joinCursor == null) {
cursor = new MyRangeCursor(this.range, config, view, this.writeAllowed);
}
}