How to use

mayContainDataBefore

method

in

org.apache.cassandra.db.Memtable

/**
 * Flush if there is unflushed data that was written to the CommitLog before @param flushIfDirtyBefore
 * (inclusive).
 *
 * @return a Future yielding the commit log position that can be guaranteed to have been successfully written
 *         to sstables for this table once the future completes
 */
public ListenableFuture<?> forceFlush(CommitLogPosition flushIfDirtyBefore)
{
  // we don't loop through the remaining memtables since here we only care about commit log dirtiness
  // and this does not vary between a table and its table-backed indexes
  Memtable current = data.getView().getCurrentMemtable();
  if (current.mayContainDataBefore(flushIfDirtyBefore))
    return switchMemtableIfCurrent(current);
  return waitForFlushes();
}

/**
 * Flush if there is unflushed data that was written to the CommitLog before @param flushIfDirtyBefore
 * (inclusive).
 *
 * @return a Future yielding the commit log position that can be guaranteed to have been successfully written
 *         to sstables for this table once the future completes
 */
public ListenableFuture<?> forceFlush(CommitLogPosition flushIfDirtyBefore)
{
  // we don't loop through the remaining memtables since here we only care about commit log dirtiness
  // and this does not vary between a table and its table-backed indexes
  Memtable current = data.getView().getCurrentMemtable();
  if (current.mayContainDataBefore(flushIfDirtyBefore))
    return switchMemtableIfCurrent(current);
  return waitForFlushes();
}

/**
 * Flush if there is unflushed data that was written to the CommitLog before @param flushIfDirtyBefore
 * (inclusive).
 *
 * @return a Future yielding the commit log position that can be guaranteed to have been successfully written
 *         to sstables for this table once the future completes
 */
public ListenableFuture<?> forceFlush(CommitLogPosition flushIfDirtyBefore)
{
  // we don't loop through the remaining memtables since here we only care about commit log dirtiness
  // and this does not vary between a table and its table-backed indexes
  Memtable current = data.getView().getCurrentMemtable();
  if (current.mayContainDataBefore(flushIfDirtyBefore))
    return switchMemtableIfCurrent(current);
  return waitForFlushes();
}