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Diffstat (limited to 'src/mongo/db/op_observer_registry.h')
| -rw-r--r-- | src/mongo/db/op_observer_registry.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/mongo/db/op_observer_registry.h b/src/mongo/db/op_observer_registry.h new file mode 100644 index 00000000000..f9d5c9bb860 --- /dev/null +++ b/src/mongo/db/op_observer_registry.h @@ -0,0 +1,190 @@ +/** + * Copyright 2016 MongoDB Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License, version 3, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * As a special exception, the copyright holders give permission to link the + * code of portions of this program with the OpenSSL library under certain + * conditions as described in each individual source file and distribute + * linked combinations including the program with the OpenSSL library. You + * must comply with the GNU Affero General Public License in all respects for + * all of the code used other than as permitted herein. If you modify file(s) + * with this exception, you may extend this exception to your version of the + * file(s), but you are not obligated to do so. If you do not wish to do so, + * delete this exception statement from your version. If you delete this + * exception statement from all source files in the program, then also delete + * it in the license file. + */ + +#pragma once + +#include <algorithm> +#include <memory> +#include <vector> + +#include "mongo/db/op_observer.h" + +namespace mongo { + +/** + * Implementation of the OpObserver interface that allows multiple observers to be registered. + * All observers will be called in order of registration. Once an observer throws an exception, + * no further observers will receive notifications: typically the enclosing transaction will be + * aborted. If an observer needs to undo changes in such a case, it should register an onRollback + * handler with the recovery unit. + */ +class OpObserverRegistry final : public OpObserver { + MONGO_DISALLOW_COPYING(OpObserverRegistry); + +public: + OpObserverRegistry() = default; + virtual ~OpObserverRegistry() = default; + + // Add 'observer' to the list of observers to call. Observers are called in registration order. + // Registration must be done while no calls to observers are made. + void addObserver(std::unique_ptr<OpObserver> observer) { + _observers.emplace_back(std::move(observer)); + } + + void onCreateIndex(OperationContext* opCtx, + const NamespaceString& nss, + OptionalCollectionUUID uuid, + BSONObj indexDoc, + bool fromMigrate) override { + for (auto& o : _observers) + o->onCreateIndex(opCtx, nss, uuid, indexDoc, fromMigrate); + } + + void onInserts(OperationContext* opCtx, + const NamespaceString& nss, + OptionalCollectionUUID uuid, + std::vector<InsertStatement>::const_iterator begin, + std::vector<InsertStatement>::const_iterator end, + bool fromMigrate) override { + for (auto& o : _observers) + o->onInserts(opCtx, nss, uuid, begin, end, fromMigrate); + } + + void onUpdate(OperationContext* opCtx, const OplogUpdateEntryArgs& args) override { + for (auto& o : _observers) + o->onUpdate(opCtx, args); + } + + void aboutToDelete(OperationContext* opCtx, + const NamespaceString& nss, + const BSONObj& doc) override { + for (auto& o : _observers) + o->aboutToDelete(opCtx, nss, doc); + } + + void onDelete(OperationContext* opCtx, + const NamespaceString& nss, + OptionalCollectionUUID uuid, + StmtId stmtId, + bool fromMigrate, + const boost::optional<BSONObj>& deletedDoc) override { + for (auto& o : _observers) + o->onDelete(opCtx, nss, uuid, stmtId, fromMigrate, deletedDoc); + } + + void onInternalOpMessage(OperationContext* opCtx, + const NamespaceString& nss, + const boost::optional<UUID> uuid, + const BSONObj& msgObj, + const boost::optional<BSONObj> o2MsgObj) override { + for (auto& o : _observers) + o->onInternalOpMessage(opCtx, nss, uuid, msgObj, o2MsgObj); + } + + void onCreateCollection(OperationContext* opCtx, + Collection* coll, + const NamespaceString& collectionName, + const CollectionOptions& options, + const BSONObj& idIndex) override { + for (auto& o : _observers) + o->onCreateCollection(opCtx, coll, collectionName, options, idIndex); + } + + void onCollMod(OperationContext* opCtx, + const NamespaceString& nss, + OptionalCollectionUUID uuid, + const BSONObj& collModCmd, + const CollectionOptions& oldCollOptions, + boost::optional<TTLCollModInfo> ttlInfo) override { + for (auto& o : _observers) + o->onCollMod(opCtx, nss, uuid, collModCmd, oldCollOptions, ttlInfo); + } + + void onDropDatabase(OperationContext* opCtx, const std::string& dbName) override { + for (auto& o : _observers) + o->onDropDatabase(opCtx, dbName); + } + repl::OpTime onDropCollection(OperationContext* opCtx, + const NamespaceString& collectionName, + OptionalCollectionUUID uuid) override { + return _forEachObserver([&](auto& observer) -> repl::OpTime { + return observer.onDropCollection(opCtx, collectionName, uuid); + }); + } + + void onDropIndex(OperationContext* opCtx, + const NamespaceString& nss, + OptionalCollectionUUID uuid, + const std::string& indexName, + const BSONObj& idxDescriptor) override { + for (auto& o : _observers) + o->onDropIndex(opCtx, nss, uuid, indexName, idxDescriptor); + } + + repl::OpTime onRenameCollection(OperationContext* opCtx, + const NamespaceString& fromCollection, + const NamespaceString& toCollection, + OptionalCollectionUUID uuid, + bool dropTarget, + OptionalCollectionUUID dropTargetUUID, + bool stayTemp) override { + return _forEachObserver([&](auto& observer) -> repl::OpTime { + return observer.onRenameCollection( + opCtx, fromCollection, toCollection, uuid, dropTarget, dropTargetUUID, stayTemp); + }); + } + + void onApplyOps(OperationContext* opCtx, + const std::string& dbName, + const BSONObj& applyOpCmd) override { + for (auto& o : _observers) + o->onApplyOps(opCtx, dbName, applyOpCmd); + } + + void onEmptyCapped(OperationContext* opCtx, + const NamespaceString& collectionName, + OptionalCollectionUUID uuid) { + for (auto& o : _observers) + o->onEmptyCapped(opCtx, collectionName, uuid); + } + +private: + repl::OpTime _forEachObserver(stdx::function<repl::OpTime(OpObserver&)> f) { + repl::OpTime opTime; + for (auto& observer : _observers) { + repl::OpTime newTime = f(*observer); + if (!newTime.isNull() && newTime != opTime) { + invariant(opTime.isNull()); + opTime = newTime; + } + } + return opTime; + } + std::vector<std::unique_ptr<OpObserver>> _observers; +}; +} // namespace mongo |