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/**
* 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);
}
void onTransactionCommit(OperationContext* opCtx) override {
for (auto& o : _observers)
o->onTransactionCommit(opCtx);
}
void onTransactionAbort(OperationContext* opCtx) override {
for (auto& o : _observers)
o->onTransactionAbort(opCtx);
}
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
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