mirror of https://gitee.com/bigwinds/arangodb
148 lines
4.7 KiB
C++
148 lines
4.7 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2019 ArangoDB 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 ArangoDB GmbH, Cologne, Germany
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///
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/// @author Tobias Gödderz
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_REMOTE_EXECUTOR_H
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#define ARANGOD_AQL_REMOTE_EXECUTOR_H
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#include "Aql/ClusterNodes.h"
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#include "Aql/ExecutorInfos.h"
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#include "Aql/ExecutionBlockImpl.h"
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#include <mutex>
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#include <fuerte/message.h>
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#include <fuerte/types.h>
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namespace arangodb {
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namespace aql {
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// The RemoteBlock is actually implemented by specializing ExecutionBlockImpl,
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// so this class only exists to identify the specialization.
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class RemoteExecutor final {};
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/**
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* @brief See ExecutionBlockImpl.h for documentation.
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*/
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template <>
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class ExecutionBlockImpl<RemoteExecutor> : public ExecutionBlock {
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public:
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// TODO Even if it's not strictly necessary here, for consistency's sake the
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// non-standard arguments (server, ownName and queryId) should probably be
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// moved into some RemoteExecutorInfos class.
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ExecutionBlockImpl(ExecutionEngine* engine, RemoteNode const* node,
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ExecutorInfos&& infos, std::string const& server,
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std::string const& ownName, std::string const& queryId);
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~ExecutionBlockImpl() override = default;
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std::pair<ExecutionState, SharedAqlItemBlockPtr> getSome(size_t atMost) override;
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std::pair<ExecutionState, size_t> skipSome(size_t atMost) override;
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std::pair<ExecutionState, Result> initializeCursor(InputAqlItemRow const& input) override;
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std::pair<ExecutionState, Result> shutdown(int errorCode) override;
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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// only for asserts:
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public:
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std::string const& server() const { return _server; }
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std::string const& ownName() const { return _ownName; }
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std::string const& queryId() const { return _queryId; }
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#endif
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private:
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std::pair<ExecutionState, SharedAqlItemBlockPtr> getSomeWithoutTrace(size_t atMost);
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std::pair<ExecutionState, size_t> skipSomeWithoutTrace(size_t atMost);
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ExecutorInfos const& infos() const { return _infos; }
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Query const& getQuery() const { return _query; }
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/// @brief internal method to send a request. Will register a callback to be
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/// reactivated
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arangodb::Result sendAsyncRequest(fuerte::RestVerb type, std::string const& urlPart,
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velocypack::Buffer<uint8_t>&& body);
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// _communicationMutex *must* be locked for this!
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unsigned generateRequestTicket();
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private:
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enum class ReqState {
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None,
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SendingGetSome,
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GotSendSome,
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SendingSkipSome,
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GotSkipSome,
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SendingShutdown,
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GotShutdown
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};
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ExecutorInfos _infos;
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Query const& _query;
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/// @brief our server, can be like "shard:S1000" or like "server:Claus"
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std::string const _server;
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/// @brief our own identity, in case of the coordinator this is empty,
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/// in case of the DBservers, this is the shard ID as a string
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std::string const _ownName;
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/// @brief the ID of the query on the server as a string
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std::string const _queryId;
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/// @brief whether or not this block will forward initialize,
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/// initializeCursor or shutDown requests
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bool const _isResponsibleForInitializeCursor;
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std::mutex _communicationMutex;
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/// @brief the last unprocessed result. Make sure to reset it
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/// after it is processed.
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std::unique_ptr<fuerte::Response> _lastResponse;
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/// @brief the last remote response Result object, may contain an error.
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arangodb::Result _lastError;
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unsigned _lastTicket; /// used to check for canceled requests
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bool _requestInFlight;
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bool _hasTriggeredShutdown;
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// bool _didReceiveShutdownRequest;
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void traceGetSomeRequest(velocypack::Slice slice, size_t atMost);
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void traceSkipSomeRequest(velocypack::Slice slice, size_t atMost);
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void traceInitializeCursorRequest(velocypack::Slice slice);
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void traceShutdownRequest(velocypack::Slice slice, int errorCode);
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void traceRequest(const char* rpc, velocypack::Slice slice, std::string const& args);
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};
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} // namespace aql
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} // namespace arangodb
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#endif // ARANGOD_AQL_REMOTE_EXECUTOR_H
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