private void invokeCallbacks(Callback<Void>[] callbacks, Throwable e) {
for (Callback<Void> callback : callbacks) {
try {
callback.onDone(null, e);
} catch (Throwable e2) {
Log.error("Transaction callback error", e2);
}
}
}
private void persist() {
while (!Thread.interrupted()) {
try {
persistData();
} catch (Exception e1) {
Log.error("Failed to persist data!", e1);
}
if (data.active.get()) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
} else {
try {
persistData();
} catch (Exception e1) {
Log.error("Failed to persist data!", e1);
}
return;
}
}
}
/**
* ACID transactional semantics:<br>
* - Atomicity with automatic rollback in case of exception,<br>
* - Consistency - only with constraints enforced programmatically inside transaction,<br>
* - Isolation is serializable (with global lock),<br>
* - Durability through on-commit callbacks.<br>
*/
public void transaction(Runnable transaction, boolean readOnly, Callback<Void> txCallback) {
globalLock();
data.txIdCounter.set(data.ids.get());
data.txChanges.clear();
data.txInsertions.clear();
data.txReadonly.set(readOnly);
data.insideTx.set(true);
boolean success = false;
try {
transaction.run();
success = true;
} catch (Throwable e) {
if (SuccessException.isSuccess(e)) {
success = true;
throw U.rte(e);
} else {
Log.error("Error in transaction, rolling back", e);
txRollback();
if (txCallback != null) {
txCallback.onDone(null, e);
txCallback = null;
}
}
} finally {
data.txChanges.clear();
data.txInsertions.clear();
data.insideTx.set(false);
if (persistor != null) {
if (success && txCallback != null) {
data.txCallbacks.add(txCallback);
}
} else {
if (success && txCallback != null) {
txCallback.onDone(null, null);
}
}
globalUnlock();
}
}
public void loadFrom(InputStream in) {
globalLock();
try {
data.data.clear();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
String line = reader.readLine();
byte[] bytes = line.getBytes();
U.must(line != null, "Missing meta-data at the first line in the database file!");
Map<String, Object> meta = U.map();
data.serializer.deserialize(bytes, meta);
Log.info(
"Database meta-data",
META_TIMESTAMP,
meta.get(META_TIMESTAMP),
META_UPTIME,
meta.get(META_UPTIME));
while ((line = reader.readLine()) != null) {
bytes = line.getBytes();
Map<String, Object> map = U.map();
data.serializer.deserialize(bytes, map);
Object idObj = map.get(ID);
U.must(idObj != null, "Found DB record without ID: %s", line);
long id = Cls.convert(idObj, Long.class);
String className = ((String) map.get("_class"));
String[] nameParts = className.split("\\.");
String simpleName = nameParts[nameParts.length - 1];
List<Class<?>> classes = Scan.byName(simpleName, null, null);
if (classes.size() == 1) {
Class<?> type = classes.get(0);
data.data.put(id, new Rec(type, bytes));
if (id > data.ids.get()) {
data.ids.set(id);
}
} else {
if (classes.isEmpty()) {
Log.error("Cannot find the class of a DB record!", "id", id, "class", className);
} else {
Log.error("Found more than 1 class of a DB record!", "id", id, "class", className);
}
}
}
data.prevData = new ConcurrentSkipListMap<Long, Rec>(data.data);
reader.close();
} catch (IOException e) {
throw new RuntimeException("Cannot load database!", e);
} finally {
globalUnlock();
}
}
