mirror of https://gitee.com/bigwinds/arangodb
124 lines
4.2 KiB
C++
124 lines
4.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Infrastructure for ExecutionBlocks, the execution engine
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///
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/// @file arangod/Aql/ExecutionBlock.cpp
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///
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/// DISCLAIMER
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///
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/// Copyright 2010-2014 triagens GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Max Neunhoeffer
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/// @author Copyright 2014, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "Aql/ExecutionBlock.h"
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#include "Utils/Exception.h"
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using namespace triagens::arango;
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using namespace triagens::aql;
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// -----------------------------------------------------------------------------
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// --SECTION-- class ExecutionBlock
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief batch size value
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////////////////////////////////////////////////////////////////////////////////
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size_t const ExecutionBlock::DefaultBatchSize = 1000;
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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ExecutionBlock::~ExecutionBlock () {
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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int ExecutionBlock::bind (AqlItemBlock* items, size_t pos) {
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int res;
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for (auto d : _dependencies) {
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res = d->bind(items, pos);
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if (res != TRI_ERROR_NO_ERROR) {
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return res;
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}
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}
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return TRI_ERROR_NO_ERROR;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief functionality to walk an execution block recursively
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////////////////////////////////////////////////////////////////////////////////
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void ExecutionBlock::walk (WalkerWorker* worker) {
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// Only do every node exactly once:
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if (worker->done(this)) {
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return;
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}
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worker->before(this);
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// Now the children in their natural order:
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for (auto c : _dependencies) {
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c->walk(worker);
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}
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// Now handle a subquery:
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if (_exeNode->getType() == ExecutionNode::SUBQUERY) {
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auto p = static_cast<SubqueryBlock*>(this);
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if (worker->enterSubquery(this, p->getSubquery())) { ;
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p->getSubquery()->walk(worker);
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worker->leaveSubquery(this, p->getSubquery());
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}
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}
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worker->after(this);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief static analysis
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////////////////////////////////////////////////////////////////////////////////
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void ExecutionBlock::staticAnalysis (ExecutionBlock* super) {
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// The super is only for the case of subqueries.
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shared_ptr<VarOverview> v;
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if (super == nullptr) {
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v.reset(new VarOverview());
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}
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else {
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v.reset(new VarOverview(*(super->_varOverview), super->_depth));
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}
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v->setSharedPtr(&v);
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walk(v.get());
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// Now handle the subqueries:
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for (auto s : v->subQueryBlocks) {
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auto sq = static_cast<SubqueryBlock*>(s);
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sq->getSubquery()->staticAnalysis(s);
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}
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v->reset();
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}
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
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// End:
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