mirror of https://gitee.com/bigwinds/arangodb
123 lines
3.1 KiB
C++
123 lines
3.1 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.h
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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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#ifndef ARANGODB_AQL_EXECUTION_BLOCK_H
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#define ARANGODB_AQL_EXECUTION_BLOCK_H 1
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#include <Basics/JsonHelper.h>
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#include "Aql/Types.h"
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#include "Aql/ExecutionPlan.h"
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struct TRI_json_s;
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namespace triagens {
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namespace aql {
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class ExecutionBlock {
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public:
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ExecutionBlock (ExecutionPlan const* ep)
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: _exePlan(ep) { }
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virtual ~ExecutionBlock () {
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std::cout << "EXECUTIONBLOCK DTOR\n";
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for (auto i = _dependencies.begin(); i != _dependencies.end(); ++i) {
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delete *i;
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}
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}
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// Methods for execution:
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int initialise () {
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return TRI_ERROR_NO_ERROR;
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}
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int bind (std::map<std::string, struct TRI_json_s*>* params);
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std::map<std::string, struct TRI_json_s*>* getParameters ();
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int execute () {
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return TRI_ERROR_NO_ERROR;
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}
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int shutdown () {
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return TRI_ERROR_NO_ERROR;
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}
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virtual AqlValue* getOne () = 0;
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std::vector<AqlValue*> getSome (int atLeast, int atMost);
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bool skip (int number);
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int64_t count ();
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int64_t remaining ();
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protected:
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ExecutionPlan const* _exePlan;
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std::vector<ExecutionBlock*> _dependencies;
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std::deque<AqlValue*> _buffer;
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};
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class EnumerateCollectionBlock : public ExecutionBlock {
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public:
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EnumerateCollectionBlock (EnumerateCollectionPlan const* ep)
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: ExecutionBlock(ep) {
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}
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~EnumerateCollectionBlock () {
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std::cout << "ENUMERATECOLLECTIONBLOCK DTOR\n";
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}
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AqlValue* getOne () {
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if (_buffer.empty()) {
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}
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auto value = _buffer.front();
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_buffer.pop_front();
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return value;
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}
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};
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} // namespace triagens::aql
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} // namespace triagens
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#endif
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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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