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Code Issues Projects Releases Wiki Activity

Avoid race conditions when updating the UI from events.

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This commit is contained in:
akwizgran
2016-10-17 10:54:00 +01:00
parent 50a70f7649
commit 2140a290e4
14 changed files with 239 additions and 93 deletions
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16
briar-android/src/org/briarproject/android/blogs/FeedFragment.java
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@@ -27,6 +27,7 @@ import org.briarproject.api.blogs.BlogPostHeader;
import org.briarproject.api.db.DbException;
import java.util.Collection;
import java.util.logging.Logger;
import javax.inject.Inject;
@@ -41,6 +42,7 @@ public class FeedFragment extends BaseFragment implements
OnBlogPostClickListener, OnBlogPostAddedListener {
public final static String TAG = FeedFragment.class.getName();
private static final Logger LOG = Logger.getLogger(TAG);
@Inject
FeedController feedController;
@@ -129,14 +131,21 @@ public class FeedFragment extends BaseFragment implements
}
private void loadBlogPosts(final boolean clear) {
final int revision = adapter.getRevision();
feedController.loadBlogPosts(
new UiResultExceptionHandler<Collection<BlogPostItem>, DbException>(
listener) {
@Override
public void onResultUi(Collection<BlogPostItem> posts) {
if (clear) adapter.setItems(posts);
else adapter.addAll(posts);
if (posts.isEmpty()) list.showData();
if (revision == adapter.getRevision()) {
adapter.incrementRevision();
if (clear) adapter.setItems(posts);
else adapter.addAll(posts);
if (posts.isEmpty()) list.showData();
} else {
LOG.info("Concurrent update, reloading");
loadBlogPosts(clear);
}
}
@Override
@@ -193,6 +202,7 @@ public class FeedFragment extends BaseFragment implements
listener) {
@Override
public void onResultUi(BlogPostItem post) {
adapter.incrementRevision();
adapter.add(post);
if (local) {
showSnackBar(R.string.blogs_blog_post_created);