@Override
public Cursor query(
final Uri uri,
final String[] projection,
final String selection,
final String[] selectionArgs,
final String sortOrder) {
if (K9.app == null) {
return null;
}
if (K9.DEBUG) {
Log.v(K9.LOG_TAG, "MessageProvider/query: " + uri);
}
final Cursor cursor;
final int code = mUriMatcher.match(uri);
if (code == -1) {
throw new IllegalStateException("Unrecognized URI: " + uri);
}
try {
// since we used the list index as the UriMatcher code, using it
// back to retrieve the handler from the list
final QueryHandler handler = mQueryHandlers.get(code);
cursor = handler.query(uri, projection, selection, selectionArgs, sortOrder);
} catch (Exception e) {
Log.e(K9.LOG_TAG, "Unable to execute query for URI: " + uri, e);
return null;
}
return cursor;
}
@Override
public Cursor query(
Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
throws Exception {
mSemaphore.acquire();
final Cursor cursor;
cursor = mDelegate.query(uri, projection, selection, selectionArgs, sortOrder);
/* Android content resolvers can only process CrossProcessCursor instances */
if (!(cursor instanceof CrossProcessCursor)) {
Log.w(K9.LOG_TAG, "Unsupported cursor, returning null: " + cursor);
return null;
}
final MonitoredCursor wrapped = new MonitoredCursor((CrossProcessCursor) cursor, mSemaphore);
/* use a weak reference not to actively prevent garbage collection */
final WeakReference<MonitoredCursor> weakReference =
new WeakReference<MonitoredCursor>(wrapped);
/* make sure the cursor is closed after 30 seconds */
mScheduledPool.schedule(
new Runnable() {
@Override
public void run() {
final MonitoredCursor monitored = weakReference.get();
if (monitored != null && !monitored.isClosed()) {
Log.w(K9.LOG_TAG, "Forcibly closing remotely exposed cursor");
try {
monitored.close();
} catch (Exception e) {
Log.w(K9.LOG_TAG, "Exception while forcibly closing cursor", e);
}
}
}
},
30,
TimeUnit.SECONDS);
return wrapped;
}