Document ChangeListener

Mobile Sync Gateway
1

Hi Guys, i am just tested something and it does not seem to work accordingly to plan.

Now i have 2 android phones, Phone A and Phone B, both are connected to the couchbase server through sync gateway.

Phone A Created Document ID 1 Rev 2-33
Phone A Push to Couchbase Sever
Phone B pulls from couchbase Sever
Phone B updates Document ID 1 Rev 3-22
Phone B Push to Couchbase Sever.

How can i notify Phone A that there is a change in document ? Or is it because i SetContinous to true it will forever listen to any document change in the sever and automatically sycn down.

I tried to use the Doc.addChangeListener example but it only triggers when i update a document on that particulate phone and not the other phone

2

As long as you are subscribed to the proper channels and have access to the document from both phones, you should receive a change when a new revision is created. Set continuous replication means that the device will “listen” forever for changes. Do you see any errors in the sync gateway or couchbase lite logs?

1 Like
4

Hey bro, i found the error already. Could you help understand the error?

This is my couchbase lite log:

08-23 03:48:43.323 5867-5989/com.couchbase.toshiba.testcouch D/couchbaseevents: New revision added: {Drinks #31-6e157d8dd87918e5b2140a1d0ac56a87 @35}. Conflict: false
08-23 03:48:43.324 5867-5989/com.couchbase.toshiba.testcouch E/Database: Unknown Exception: com.couchbase.lite.Database[/data/user/0/com.couchbase.toshiba.testcouch/files/testdata.cblite2] got exception posting change notifications
java.lang.RuntimeException: Can’t create handler inside thread that has not called Looper.prepare()
at android.os.Handler.(Handler.java:200)
at android.os.Handler.(Handler.java:114)
at android.widget.Toast$TN.(Toast.java:345)
at android.widget.Toast.(Toast.java:101)
at android.widget.Toast.makeText(Toast.java:259)
at com.couchbase.toshiba.testcouch.MainActivity$5$1.changed(MainActivity.java:125)
at com.couchbase.lite.Document.revisionAdded(Document.java:501)
at com.couchbase.lite.Database.postChangeNotifications(Database.java:2222)
at com.couchbase.lite.Database.storageExitedTransaction(Database.java:696)
at com.couchbase.lite.store.SQLiteStore.endTransaction(SQLiteStore.java:2171)
at com.couchbase.lite.store.SQLiteStore.runInTransaction(SQLiteStore.java:690)
at com.couchbase.lite.replicator.PullerInternal.insertDownloads(PullerInternal.java:548)
at com.couchbase.lite.replicator.PullerInternal$2.process(PullerInternal.java:117)
at com.couchbase.lite.support.Batcher.processNow(Batcher.java:383)
at com.couchbase.lite.support.Batcher.access$300(Batcher.java:16)
at com.couchbase.lite.support.Batcher$2.run(Batcher.java:317)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:269)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
08-23 03:48:48.353 5867-13910/com.couchbase.toshiba.testcouch E/RemoteRequest: Got error status: 409 for http://192.168.1.130:4984/testdata/_local/ff3fed2c75f2ef09832217300ae8867dda7d6627. Reason: Conflict

5

And this is my code in android studio

Document doc = database.getDocument(“Drinks”);
final CountDownLatch documentChanged = new CountDownLatch(1);
doc.addChangeListener(new Document.ChangeListener() {
@Override
public void changed(Document.ChangeEvent event) {
DocumentChange docChange = event.getChange();
String msg = “New revision added: %s. Conflict: %s”;
msg = String.format(msg, docChange.getAddedRevision(), docChange.isConflict());
Log.d(TAG, msg);
Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();

                    documentChanged.countDown();
                }
            });
            try {
                doc.createRevision().save();
            } catch (CouchbaseLiteException e) {
                e.printStackTrace();
            }
        }
6

Looks like you’re not posting the toast on the UI thread. Check out this Stack Overflow post: http://stackoverflow.com/questions/3875184/cant-create-handler-inside-thread-that-has-not-called-looper-prepare

1 Like
7

bro, thanks for your answer! It worked! thank you so much!

8

Thanks so much for your help :slight_smile: