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Code Issues Releases Wiki Activity

Remove O(n) deep SQL queries per folderlist by cleaning up the folder "exists" check on Local message stores

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* Replace the extra SQL query before each folder 'open' with an exception if the open fails. (Optimize for the common case, not the exception)
This commit is contained in:
Jesse Vincent 2008-11-01 21:36:23 +00:00
parent cd7a7a67fb
commit 046943b340
1 changed files with 27 additions and 6 deletions
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33
src/com/fsck/k9/mail/store/LocalStore.java
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@ -141,6 +141,8 @@ public class LocalStore extends Store {
public Folder[] getPersonalNamespaces() throws MessagingException {
ArrayList<Folder> folders = new ArrayList<Folder>();
Cursor cursor = null;
try {
cursor = mDb.rawQuery("SELECT name FROM folders", null);
while (cursor.moveToNext()) {
@ -334,7 +336,6 @@ public class LocalStore extends Store {
return;
}
if (!exists()) {
create(FolderType.HOLDS_MESSAGES);
}
Cursor cursor = null;
try {
@ -343,10 +344,18 @@ public class LocalStore extends Store {
new String[] {
mName
});
cursor.moveToFirst();
mFolderId = cursor.getInt(0);
mUnreadMessageCount = cursor.getInt(1);
mVisibleLimit = cursor.getInt(2);
if ( cursor.getCount() == 0 ) {
// Calling exists on open is a little expensive. Instead, just handle it when we don't find it.
create(FolderType.HOLDS_MESSAGES);
open(mode);
}
cursor.moveToFirst();
mFolderId = cursor.getInt(0);
mUnreadMessageCount = cursor.getInt(1);
mVisibleLimit = cursor.getInt(2);
}
finally {
if (cursor != null) {
@ -372,7 +381,19 @@ public class LocalStore extends Store {
@Override
public boolean exists() throws MessagingException {
return Utility.arrayContains(getPersonalNamespaces(), this);
Cursor cursor = null;
int mFolderId = 0 ;
try {
cursor = mDb.rawQuery("SELECT id FROM folders " + "where folders.name = ?", new String[] { this.getName() });
cursor.moveToFirst();
mFolderId = cursor.getInt(0);
}
finally {
if (cursor != null) {
cursor.close();
}
}
return (mFolderId > 0 )? true : false;
}
@Override