private void runTest(TransactionWithQuery<Root, Entity> createEntityTransaction)
throws Exception {
// Create or load existing prevalence layer from journal and/or snapshot.
String dataPath = "target/PrevalenceBase_" + System.currentTimeMillis();
Prevayler<Root> prevayler = PrevaylerFactory.createPrevayler(new Root(), dataPath);
try {
final Entity entity = prevayler.execute(createEntityTransaction);
final long timestampWhenInitiallyCreated = entity.getCreated();
// close and reopen prevalence so the journal is replayed
prevayler.close();
prevayler = PrevaylerFactory.createPrevayler(new Root(), dataPath);
long timestampAfterRestart =
prevayler.execute(
new Query<Root, Long>() {
public Long query(Root prevalentSystem, Date executionTime) throws Exception {
return prevalentSystem.getEntities().get(entity.getIdentity()).getCreated();
}
});
assertEquals(
"timestamp should not have changed",
timestampWhenInitiallyCreated,
timestampAfterRestart);
} finally {
prevayler.close();
}
}
public void open() throws Exception {
prevayler = PrevaylerFactory.createPrevayler(new Root(), "PrevalenceBase");
if (prevayler.prevalentSystem().getCreated() == null) {
prevayler.execute(new InitializeServiceTransaction());
prevayler.takeSnapshot();
}
}
@Override
public void run() {
while (!terminated) {
try {
sleep(MINUTES * snapshotPeriodMinutes);
} catch (InterruptedException e) {
}
try {
if (journalFilesExist()) {
prevayler.takeSnapshot();
cleanupJournalFiles();
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
public void close() throws Exception {
prevayler.close();
}
public void snapshot() throws IOException {
prevayler.takeSnapshot();
cleanupJournalFiles();
}