I made this post because I don't understand how transaction works using GreenDao and I would love to get some explanation/recent tutorial.
Despite of reading the Greendao github, I don't understand how the main activity works. For example:
...
Note note = new Note(null, noteText, comment, new Date(), NoteType.TEXT);
noteDao.insert(note)
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Action1<Note>() {
@Override
public void call(Note note) {
Log.d("DaoExample", "Inserted new note, ID: " + note.getId());
updateNotes();
}
});
...
Do the observeOn method sends every insertion/update to one limited buffer? so, it will manage automatically the insertion to the real database when every operation was finished whithout problems?
Reading its API, we could see that they use rxTx and rxTxPlain for transactions (other way?), and finding out where are performed, I have to say I misunderstood everything. For example:
...
public void testConcurrentInsertDuringTx() throws InterruptedException {
...
Runnable runnable2 = new Runnable() {
@Override
public void run() {
dao.insertInTx(createEntity(null));
}
};
Runnable runnable3 = new Runnable() {
@Override
public void run() {
daoSession.runInTx(new Runnable() {
@Override
public void run() {
dao.insert(createEntity(null));
}
});
}
};
...
// Builds the statement so it is ready immediately in the thread
dao.insert(createEntity(null));
doTx(new Runnable() {
@Override
public void run() {
dao.insert(createEntity(null));
}
});
latchThreadsDone.await();
assertEquals(7, dao.count());
}
...
I know this is an example, but I don't know the diferences of using the rx methods and the observeOn/subscribe ones
protected void doTx(final Runnable runnableInsideTx) {
daoSession.runInTx(new Runnable() {
@Override
public void run() {
latchInsideTx.countDown();
// Give the concurrent thread time so it will try to acquire locks
try {
Thread.sleep(TIME_TO_WAIT_FOR_THREAD);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
runnableInsideTx.run();
}
});
}
I read some topics about transactions, but they are obsoletes or maybe, I didn't understand them correctly:
SQLite transaction behaviour using greendao
Android - Green Dao Multiple Transaction
greenDAO 40 seconds to insert 600 records
https://groups.google.com/forum/#!topic/greendao/PXRwCRTbP6c
Someone could help me giving me some explanation/recent tutorial? Greendao have these methods as experimentals. Thanks in advance
