/** triggered if the last remaining upstream finished or failed */
protected void onFinish() {
assert !paused : "must not receive a finish call if upstream should be paused";
for (Object[] objects : pauseFifo) {
sharedRow.cells(objects);
boolean wantMore = delegate.setNextRow(sharedRow);
if (!wantMore) {
break;
}
}
delegate.finish();
}
@Override
public void prepare(ExecutionState executionState) {
if (prepared.compareAndSet(false, true)) {
delegate.prepare(executionState);
this.executionState = executionState;
}
}
protected boolean synchronizedSetNextRow(Row row) {
if (paused) {
pauseFifo.add(row.materialize());
return true;
} else {
Object[] bufferedCells;
while ((bufferedCells = pauseFifo.poll()) != null) {
sharedRow.cells(bufferedCells);
boolean wantMore = delegate.setNextRow(sharedRow);
if (!wantMore) {
return false;
}
if (paused) {
pauseFifo.add(row.materialize());
return true;
}
}
return delegate.setNextRow(row);
}
}
public MultiUpstreamRowReceiver(RowReceiver delegate) {
delegate.setUpstream(this);
this.delegate = delegate;
}
@Override
public Set<Requirement> requirements() {
return delegate.requirements();
}
/** triggered if the last remaining upstream finished or failed */
protected void onFail(Throwable t) {
delegate.fail(t);
}
