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Code Issues Projects Releases Wiki Activity

Cache ratings to avoid hitting the DB.

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This commit is contained in:
akwizgran
2013-03-15 00:02:08 +00:00
parent 23ab23a931
commit 5151fc3824
1 changed files with 53 additions and 5 deletions
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58
briar-android/src/net/sf/briar/android/groups/GroupActivity.java
View File

@@ -8,7 +8,9 @@ import static net.sf.briar.api.Rating.UNRATED;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executor;
import java.util.logging.Logger;
@@ -29,8 +31,10 @@ import net.sf.briar.api.db.event.DatabaseEvent;
import net.sf.briar.api.db.event.DatabaseListener;
import net.sf.briar.api.db.event.GroupMessageAddedEvent;
import net.sf.briar.api.db.event.MessageExpiredEvent;
import net.sf.briar.api.db.event.RatingChangedEvent;
import net.sf.briar.api.db.event.SubscriptionRemovedEvent;
import net.sf.briar.api.messaging.Author;
import net.sf.briar.api.messaging.AuthorId;
import net.sf.briar.api.messaging.GroupId;
import net.sf.briar.api.messaging.Message;
import net.sf.briar.api.messaging.MessageId;
@@ -54,6 +58,8 @@ OnClickListener, OnItemClickListener {
private final BriarServiceConnection serviceConnection =
new BriarServiceConnection();
private final Map<AuthorId, Rating> ratingCache =
new ConcurrentHashMap<AuthorId, Rating>();
// The following fields must only be accessed from the UI thread
private final Set<MessageId> messageIds = new HashSet<MessageId>();
@@ -145,9 +151,12 @@ OnClickListener, OnItemClickListener {
private void displayHeaders(final Collection<GroupMessageHeader> headers) {
runOnUiThread(new Runnable() {
public void run() {
ratingCache.clear();
messageIds.clear();
adapter.clear();
for(GroupMessageHeader h : headers) {
Author a = h.getAuthor();
if(a != null) ratingCache.put(a.getId(), h.getRating());
messageIds.add(h.getId());
adapter.add(h);
}
@@ -198,6 +207,11 @@ OnClickListener, OnItemClickListener {
} else if(e instanceof MessageExpiredEvent) {
if(LOG.isLoggable(INFO)) LOG.info("Message removed, reloading");
loadHeaders(); // FIXME: Don't reload unnecessarily
} else if(e instanceof RatingChangedEvent) {
RatingChangedEvent r = (RatingChangedEvent) e;
AuthorId a = r.getAuthorId();
ratingCache.remove(a);
updateRating(a, r.getRating());
} else if(e instanceof SubscriptionRemovedEvent) {
if(((SubscriptionRemovedEvent) e).getGroupId().equals(groupId)) {
if(LOG.isLoggable(INFO)) LOG.info("Subscription removed");
@@ -207,9 +221,14 @@ OnClickListener, OnItemClickListener {
}
private void loadRatingOrAddToGroup(Message m, boolean incoming) {
// FIXME: Cache ratings to avoid hitting the DB
if(m.getAuthor() == null) addToGroup(m, UNRATED, incoming);
else loadRating(m, incoming);
Author a = m.getAuthor();
if(a == null) {
addToGroup(m, UNRATED, incoming);
} else {
Rating r = ratingCache.get(a.getId());
if(r == null) loadRating(m, incoming);
else addToGroup(m, r, incoming);
}
}
private void addToGroup(final Message m, final Rating r,
@@ -217,7 +236,10 @@ OnClickListener, OnItemClickListener {
runOnUiThread(new Runnable() {
public void run() {
if(messageIds.add(m.getId())) {
adapter.add(new GroupMessageHeader(m, !incoming, false, r));
adapter.add(new GroupMessageHeader(m.getId(), m.getParent(),
m.getContentType(), m.getSubject(),
m.getTimestamp(),!incoming, false,
m.getGroup().getId(), m.getAuthor(), r));
adapter.sort(AscendingHeaderComparator.INSTANCE);
selectFirstUnread();
}
@@ -232,7 +254,10 @@ OnClickListener, OnItemClickListener {
// Wait for the service to be bound and started
serviceConnection.waitForStartup();
// Load the rating from the database
Rating r = db.getRating(m.getAuthor().getId());
AuthorId a = m.getAuthor().getId();
Rating r = db.getRating(a);
// Cache the rating
ratingCache.put(a, r);
// Display the message
addToGroup(m, r, incoming);
} catch(DbException e) {
@@ -247,6 +272,29 @@ OnClickListener, OnItemClickListener {
});
}
private void updateRating(final AuthorId a, final Rating r) {
runOnUiThread(new Runnable() {
public void run() {
boolean affected = false;
int count = adapter.getCount();
for(int i = 0; i < count; i++) {
GroupMessageHeader h = adapter.getItem(i);
Author author = h.getAuthor();
if(author != null && author.getId().equals(a)) {
adapter.remove(h);
adapter.insert(new GroupMessageHeader(h.getId(),
h.getParent(), h.getContentType(),
h.getSubject(), h.getTimestamp(), h.isRead(),
h.isStarred(), h.getGroupId(), h.getAuthor(),
r), i);
affected = true;
}
}
if(affected) list.invalidate();
}
});
}
public void onClick(View view) {
Intent i = new Intent(this, WriteGroupMessageActivity.class);
i.putExtra("net.sf.briar.GROUP_ID", groupId.getBytes());