mirror of https://gitee.com/bigwinds/arangodb
243 lines
10 KiB
C++
243 lines
10 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_STORAGE_ENGINE_ROCKSDB_ENGINE_H
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#define ARANGOD_STORAGE_ENGINE_ROCKSDB_ENGINE_H 1
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#include "Basics/Common.h"
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#include "Basics/Mutex.h"
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#include "StorageEngine/StorageEngine.h"
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#include <velocypack/Builder.h>
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namespace arangodb {
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class RocksDBEngine final : public StorageEngine {
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public:
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// create the storage engine
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explicit RocksDBEngine(application_features::ApplicationServer*);
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~RocksDBEngine();
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// inherited from ApplicationFeature
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// ---------------------------------
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// add the storage engine's specifc options to the global list of options
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void collectOptions(std::shared_ptr<options::ProgramOptions>) override;
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// validate the storage engine's specific options
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void validateOptions(std::shared_ptr<options::ProgramOptions>) override;
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// preparation phase for storage engine. can be used for internal setup.
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// the storage engine must not start any threads here or write any files
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void prepare() override;
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// initialize engine
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void start() override;
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void stop() override;
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// called when recovery is finished
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void recoveryDone(TRI_vocbase_t* vocbase) override;
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TransactionState* createTransactionState(TRI_vocbase_t* vocbase) override;
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TransactionCollection* createTransactionCollection(TransactionState* state, TRI_voc_cid_t cid, AccessMode::Type accessType, int nestingLevel) override;
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// create storage-engine specific collection
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PhysicalCollection* createPhysicalCollection(LogicalCollection*) override;
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// inventory functionality
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// -----------------------
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// fill the Builder object with an array of databases that were detected
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// by the storage engine. this method must sort out databases that were not
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// fully created (see "createDatabase" below). called at server start only
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void getDatabases(arangodb::velocypack::Builder& result) override;
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// fills the provided builder with information about the collection
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void getCollectionInfo(TRI_vocbase_t* vocbase, TRI_voc_cid_t cid,
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arangodb::velocypack::Builder& result,
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bool includeIndexes, TRI_voc_tick_t maxTick) override;
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// fill the Builder object with an array of collections (and their corresponding
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// indexes) that were detected by the storage engine. called at server start separately
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// for each database
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int getCollectionsAndIndexes(TRI_vocbase_t* vocbase, arangodb::velocypack::Builder& result,
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bool wasCleanShutdown, bool isUpgrade) override;
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// return the path for a database
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std::string databasePath(TRI_vocbase_t const* vocbase) const override {
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return "";
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}
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// return the path for a collection
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std::string collectionPath(TRI_vocbase_t const* vocbase, TRI_voc_cid_t id) const override {
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return "";
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}
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TRI_vocbase_t* openDatabase(arangodb::velocypack::Slice const& parameters, bool isUpgrade, int&) override;
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// database, collection and index management
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// -----------------------------------------
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TRI_vocbase_t* createDatabase(TRI_voc_tick_t id, arangodb::velocypack::Slice const& data, int&) override;
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virtual void prepareDropDatabase(TRI_vocbase_t* vocbase, bool useWallMaker, int&) override;
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virtual void dropDatabase(TRI_vocbase_t* vocbase, int&) override;
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virtual void waitUntilDeletion(TRI_voc_tick_t id, bool force, int&) override;
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std::string createCollection(TRI_vocbase_t* vocbase, TRI_voc_cid_t id,
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arangodb::LogicalCollection const* parameters) override;
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// asks the storage engine to drop the specified collection and persist the
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// deletion info. Note that physical deletion of the collection data must not
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// be carried out by this call, as there may
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// still be readers of the collection's data. It is recommended that this operation
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// only sets a deletion flag for the collection but let's an async task perform
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// the actual deletion.
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// the WAL entry for collection deletion will be written *after* the call
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// to "dropCollection" returns
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void prepareDropCollection(TRI_vocbase_t* vocbase, arangodb::LogicalCollection* collection) override;
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// perform a physical deletion of the collection
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void dropCollection(TRI_vocbase_t* vocbase, arangodb::LogicalCollection* collection) override;
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// asks the storage engine to change properties of the collection as specified in
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// the VPack Slice object and persist them. If this operation fails
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// somewhere in the middle, the storage engine is required to fully revert the
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// property changes and throw only then, so that subsequent operations will not fail.
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// the WAL entry for the propery change will be written *after* the call
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// to "changeCollection" returns
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void changeCollection(TRI_vocbase_t* vocbase, TRI_voc_cid_t id,
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arangodb::LogicalCollection const* parameters,
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bool doSync) override;
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// asks the storage engine to create an index as specified in the VPack
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// Slice object and persist the creation info. The database id, collection id
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// and index data are passed in the Slice object. Note that this function
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// is not responsible for inserting the individual documents into the index.
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// If this operation fails somewhere in the middle, the storage engine is required
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// to fully clean up the creation and throw only then, so that subsequent index
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// creation requests will not fail.
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// the WAL entry for the index creation will be written *after* the call
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// to "createIndex" returns
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void createIndex(TRI_vocbase_t* vocbase, TRI_voc_cid_t collectionId,
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TRI_idx_iid_t id, arangodb::velocypack::Slice const& data) override;
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// asks the storage engine to drop the specified index and persist the deletion
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// info. Note that physical deletion of the index must not be carried out by this call,
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// as there may still be users of the index. It is recommended that this operation
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// only sets a deletion flag for the index but let's an async task perform
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// the actual deletion.
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// the WAL entry for index deletion will be written *after* the call
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// to "dropIndex" returns
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void dropIndex(TRI_vocbase_t* vocbase, TRI_voc_cid_t collectionId,
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TRI_idx_iid_t id) override;
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void unloadCollection(TRI_vocbase_t* vocbase, TRI_voc_cid_t collectionId) override;
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void signalCleanup(TRI_vocbase_t* vocbase) override;
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// document operations
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// -------------------
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// iterate all documents of the underlying collection
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// this is called when a collection is openend, and all its documents need to be added to
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// indexes etc.
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void iterateDocuments(TRI_voc_tick_t databaseId, TRI_voc_cid_t collectionId,
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std::function<void(arangodb::velocypack::Slice const&)> const& cb) override;
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// adds a document to the storage engine
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// this will be called by the WAL collector when surviving documents are being moved
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// into the storage engine's realm
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void addDocumentRevision(TRI_voc_tick_t databaseId, TRI_voc_cid_t collectionId,
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arangodb::velocypack::Slice const& document) override;
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// removes a document from the storage engine
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// this will be called by the WAL collector when non-surviving documents are being removed
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// from the storage engine's realm
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void removeDocumentRevision(TRI_voc_tick_t databaseId, TRI_voc_cid_t collectionId,
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arangodb::velocypack::Slice const& document) override;
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/// @brief remove data of expired compaction blockers
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bool cleanupCompactionBlockers(TRI_vocbase_t* vocbase) override;
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/// @brief insert a compaction blocker
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int insertCompactionBlocker(TRI_vocbase_t* vocbase, double ttl, TRI_voc_tick_t& id) override;
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/// @brief touch an existing compaction blocker
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int extendCompactionBlocker(TRI_vocbase_t* vocbase, TRI_voc_tick_t id, double ttl) override;
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/// @brief remove an existing compaction blocker
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int removeCompactionBlocker(TRI_vocbase_t* vocbase, TRI_voc_tick_t id) override;
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/// @brief a callback function that is run while it is guaranteed that there is no compaction ongoing
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void preventCompaction(TRI_vocbase_t* vocbase,
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std::function<void(TRI_vocbase_t*)> const& callback) override;
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/// @brief a callback function that is run there is no compaction ongoing
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bool tryPreventCompaction(TRI_vocbase_t* vocbase,
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std::function<void(TRI_vocbase_t*)> const& callback,
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bool checkForActiveBlockers) override;
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int shutdownDatabase(TRI_vocbase_t* vocbase) override;
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int openCollection(TRI_vocbase_t* vocbase, LogicalCollection* collection, bool ignoreErrors) override;
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/// @brief transfer markers into a collection
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int transferMarkers(LogicalCollection* collection, MMFilesCollectorCache*,
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MMFilesOperationsType const&) override;
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/// @brief Add engine specific AQL functions.
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void addAqlFunctions() const override;
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private:
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void verifyDirectories();
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public:
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static std::string const EngineName;
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static std::string const FeatureName;
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private:
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std::string _basePath;
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std::string _databasePath;
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struct CompactionBlocker {
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CompactionBlocker(TRI_voc_tick_t id, double expires) : _id(id), _expires(expires) {}
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CompactionBlocker() = delete;
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TRI_voc_tick_t _id;
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double _expires;
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};
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// lock for compaction blockers
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arangodb::basics::ReadWriteLock _compactionBlockersLock;
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// cross-database map of compaction blockers, protected by _compactionBlockersLock
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std::unordered_map<TRI_vocbase_t*, std::vector<CompactionBlocker>> _compactionBlockers;
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};
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}
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#endif
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