mirror of https://gitee.com/bigwinds/arangodb
160 lines
4.4 KiB
C++
160 lines
4.4 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 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 ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_TRANSACTION_CONTEXT_H
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#define ARANGOD_TRANSACTION_CONTEXT_H 1
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#include "Basics/Common.h"
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#include "Basics/SmallVector.h"
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#include "VocBase/voc-types.h"
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#include <velocypack/Options.h>
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struct TRI_vocbase_t;
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namespace arangodb {
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namespace basics {
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class StringBuffer;
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}
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namespace velocypack {
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class Builder;
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struct CustomTypeHandler;
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}
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class CollectionNameResolver;
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class LogicalCollection;
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class TransactionState;
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namespace transaction {
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class ContextData;
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class Methods;
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class Context {
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public:
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Context(Context const&) = delete;
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Context& operator=(Context const&) = delete;
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protected:
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/// @brief create the context
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explicit Context(TRI_vocbase_t* vocbase);
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public:
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/// @brief destroy the context
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virtual ~Context();
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/// @brief factory to create a custom type handler, not managed
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static arangodb::velocypack::CustomTypeHandler* createCustomTypeHandler(
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TRI_vocbase_t*,
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arangodb::CollectionNameResolver const*);
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/// @brief return the vocbase
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TRI_vocbase_t* vocbase() const { return _vocbase; }
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/// @brief pin data for the collection
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void pinData(arangodb::LogicalCollection*);
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/// @brief whether or not the data for the collection is pinned
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bool isPinned(TRI_voc_cid_t);
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/// @brief temporarily lease a StringBuffer object
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basics::StringBuffer* leaseStringBuffer(size_t initialSize);
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/// @brief return a temporary StringBuffer object
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void returnStringBuffer(basics::StringBuffer* stringBuffer);
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/// @brief temporarily lease a Builder object
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arangodb::velocypack::Builder* leaseBuilder();
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/// @brief return a temporary Builder object
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void returnBuilder(arangodb::velocypack::Builder*);
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/// @brief get velocypack options with a custom type handler
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arangodb::velocypack::Options* getVPackOptions();
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/// @brief get velocypack options for dumping
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arangodb::velocypack::Options* getVPackOptionsForDump();
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/// @brief unregister the transaction
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/// this will save the transaction's id and status locally
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void storeTransactionResult(TRI_voc_tid_t id, bool hasFailedOperations) noexcept;
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/// @brief get a custom type handler
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virtual std::shared_ptr<arangodb::velocypack::CustomTypeHandler>
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orderCustomTypeHandler() = 0;
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/// @brief return the resolver
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virtual CollectionNameResolver const* getResolver() = 0;
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/// @brief get parent transaction (if any)
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virtual TransactionState* getParentTransaction() const = 0;
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/// @brief whether or not the transaction is embeddable
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virtual bool isEmbeddable() const = 0;
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/// @brief register the transaction in the context
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virtual void registerTransaction(TransactionState*) = 0;
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/// @brief unregister the transaction
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virtual void unregisterTransaction() = 0;
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protected:
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/// @brief create a resolver
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CollectionNameResolver const* createResolver();
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transaction::ContextData* contextData();
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protected:
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TRI_vocbase_t* _vocbase;
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CollectionNameResolver const* _resolver;
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std::shared_ptr<velocypack::CustomTypeHandler> _customTypeHandler;
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SmallVector<arangodb::velocypack::Builder*, 32>::allocator_type::arena_type _arena;
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SmallVector<arangodb::velocypack::Builder*, 32> _builders;
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std::unique_ptr<arangodb::basics::StringBuffer> _stringBuffer;
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arangodb::velocypack::Options _options;
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arangodb::velocypack::Options _dumpOptions;
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std::unique_ptr<transaction::ContextData> _contextData;
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struct {
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TRI_voc_tid_t id;
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bool hasFailedOperations;
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} _transaction;
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bool _ownsResolver;
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};
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}
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}
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#endif
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