143 lines
4.2 KiB
C++
143 lines
4.2 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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*/
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#include "BlockingProgressEstimator.h"
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#include "QueryProcessor.h"
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using namespace nr2a;
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/*
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Constructors of "BlockingProgressEstimator"[2]. The first can be used if there
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is no preceeding operator. In this case the "baseInfo"[2] has to be set, before
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the estimator can yield results.
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*/
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nr2a::BlockingProgressEstimator::BlockingProgressEstimator
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(const bool waitForFirstOnly /*= false*/)
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: //m_predecessor(NULL),
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m_waitForFirstOnly(waitForFirstOnly)
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{
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//intentionally left blank
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}
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nr2a::BlockingProgressEstimator::BlockingProgressEstimator
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(Word predecessor, const bool waitForFirstOnly /*= false*/)
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: //m_predecessor(predecessor.addr),
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m_waitForFirstOnly(waitForFirstOnly)
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{
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//intentionally left blank
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}
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nr2a::BlockingProgressEstimator::~BlockingProgressEstimator()
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{
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//intentionally left blank
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}
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/*
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The estimator uses the info of the preceeding operator, if possible. Otherwise
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the "baseInfo"[2] will be used. In case of an object being its operators
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parameter, the estimator can distinguish between operators consuming only
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the first tuple. This is used with the "extract"[2] operator for example.
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*/
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/*virtual*/ int nr2a::BlockingProgressEstimator::requestProgress
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(Word* args, ProgressInfo* result, void* localInfo,
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const bool argsAvailable)
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{
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Nr2aLocalInfo<BlockingProgressEstimator>* info =
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(Nr2aLocalInfo<BlockingProgressEstimator>*)localInfo;
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int resultMessage = CANCEL;
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ProgressInfo predecessorsProgress;
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Supplier son = qp->GetSupplierSon(CostEstimation::supplier, 0);
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if (qp->IsObjectNode(son))
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{
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// If the operator's son is an object, it is assumed that this operator
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// is waiting for the object's creation and therefore totally blocked
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if (info != NULL)
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{
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result->Copy(info->base);
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if (m_waitForFirstOnly)
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{
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result->BTime = info->base.BTime;
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if (info->base.Card > 0)
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{
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result->BTime += (info->base.Time / info->base.Card);
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result->BProgress =
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(info->base.BProgress * info->base.BTime
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+ info->base.Progress * info->base.Time)
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/ (info->base.BTime + info->base.Time);
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result->Time = 0;
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result->Progress = 0;
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resultMessage = YIELD;
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}
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else
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{
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// There is no way to tell, what progress to assume if the
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// cardinality is missing.
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resultMessage = CANCEL;
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}
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}
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else
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{
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result->BTime = info->base.BTime + info->base.Time;
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result->BProgress =
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(info->base.BProgress * info->base.BTime
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+ info->base.Progress * info->base.Time)
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/ (info->base.BTime + info->base.Time);
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result->Time = 0;
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result->Progress = 0;
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resultMessage = YIELD;
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}
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}
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}
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else
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{
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// If the operator's son is not an object, this operator itself is assumed
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// to take a negligible amount of time, so the son's estimation is adopted
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ProgressInfo progressInfo;
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if (qp->RequestProgress(son, &progressInfo) )
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{
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result->Copy(progressInfo);
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resultMessage = YIELD;
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}
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}
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return resultMessage;
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}
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/*
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Functions, that can be used when defining operators.
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*/
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/*static*/ CostEstimation *
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nr2a::BlockingProgressEstimator::Build()
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{
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return new BlockingProgressEstimator();
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}
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/*static*/ CostEstimation *
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nr2a::BlockingProgressEstimator::BuildWaitForFirstOnly()
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{
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return new BlockingProgressEstimator(true);
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}
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