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Bound the number of headers we might try to fetch 

b/13545303
Prior to this change, there is no bound on the number of message
headers we might try to fetch at the same time. Now, we fetch
headers in chunks of limited size.

Change-Id: I06db96eefa8732f970c31fc3617480de40723f2d
This commit is contained in:
Martin Hibdon 2014-04-03 12:40:09 -07:00
parent 0db900d622
commit 7ea823327f
1 changed files with 20 additions and 1 deletions
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21
src/com/android/email/service/ImapService.java
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@ -68,6 +68,7 @@ import java.util.Arrays;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
public class ImapService extends Service {
// TODO get these from configurations or settings.
@ -75,6 +76,8 @@ public class ImapService extends Service {
private static final long FULL_SYNC_WINDOW_MILLIS = 7 * DateUtils.DAY_IN_MILLIS;
private static final long FULL_SYNC_INTERVAL_MILLIS = 4 * DateUtils.HOUR_IN_MILLIS;
// The maximum number of messages to fetch in a single command.
private static final int MAX_MESSAGES_TO_FETCH = 500;
private static final int MINIMUM_MESSAGES_TO_SYNC = 10;
private static final int LOAD_MORE_MIN_INCREMENT = 10;
private static final int LOAD_MORE_MAX_INCREMENT = 20;
@ -615,9 +618,25 @@ public class ImapService extends Service {
// 11. Refresh the flags for any messages in the local store that we didn't just download.
// TODO This is a bit wasteful because we're also updating any messages we already did get
// the flags and envelope for previously.
// TODO: the fetch() function, and others, should take List<>s of messages, not
// arrays of messages.
FetchProfile fp = new FetchProfile();
fp.add(FetchProfile.Item.FLAGS);
remoteFolder.fetch(remoteMessages, fp, null);
if (remoteMessages.length > MAX_MESSAGES_TO_FETCH) {
List<Message> remoteMessageList = Arrays.asList(remoteMessages);
for (int start = 0; start < remoteMessageList.size(); start += MAX_MESSAGES_TO_FETCH) {
int end = start + MAX_MESSAGES_TO_FETCH;
if (end >= remoteMessageList.size()) {
end = remoteMessageList.size() - 1;
}
List<Message> chunk = remoteMessageList.subList(start, end);
final Message[] partialArray = chunk.toArray(new Message[chunk.size()]);
// Fetch this one chunk of messages
remoteFolder.fetch(partialArray, fp, null);
}
} else {
remoteFolder.fetch(remoteMessages, fp, null);
}
boolean remoteSupportsSeen = false;
boolean remoteSupportsFlagged = false;
boolean remoteSupportsAnswered = false;