/**
* Get a CacheToken for a row as specified by its id (_id column)
*
* @param id the id of the record
* @return a CacheToken needed in order to write data for the record back to the cache
*/
public synchronized CacheToken getCacheToken(String id) {
// If another thread is already writing the data, return an invalid token
CacheToken token = mTokenList.add(id);
if (mLockMap.contains(id)) {
token.invalidate();
}
return token;
}
/*package*/ void invalidate() {
if (MailActivityEmail.DEBUG && DEBUG_TOKENS) {
LogUtils.d(mLogTag, "============ List invalidated");
}
for (CacheToken token : this) {
token.invalidate();
}
clear();
}
public synchronized Cursor putCursorImpl(
Cursor c, String id, String[] projection, CacheToken token) {
try {
if (!token.isValid()) {
if (MailActivityEmail.DEBUG && DEBUG_CACHE) {
LogUtils.d(mLogTag, "============ Stale token for " + id);
}
mStats.mStaleCount++;
return c;
}
if (c != null && Arrays.equals(projection, mBaseProjection) && !sLockCache) {
if (MailActivityEmail.DEBUG && DEBUG_CACHE) {
LogUtils.d(mLogTag, "============ Caching cursor for: " + id);
}
// If we've already cached this cursor, invalidate the older one
Cursor existingCursor = get(id);
if (existingCursor != null) {
unlockImpl(id, null, false);
}
mLruCache.put(id, c);
return new CachedCursor(c, this, id);
}
return c;
} finally {
mTokenList.remove(token);
}
}
/*package*/ int invalidateTokens(String id) {
if (MailActivityEmail.DEBUG && DEBUG_TOKENS) {
LogUtils.d(mLogTag, "============ Invalidate tokens for: " + id);
}
ArrayList<CacheToken> removeList = new ArrayList<CacheToken>();
int count = 0;
for (CacheToken token : this) {
if (token.getId().equals(id)) {
token.invalidate();
removeList.add(token);
count++;
}
}
for (CacheToken token : removeList) {
remove(token);
}
return count;
}
