ephemeral_for_test_record_store.h

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// ephemeral_for_test_record_store.h

#pragma once

#include <boost/shared_array.hpp>
#include <map>

#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/storage/capped_callback.h"
#include "mongo/db/storage/record_store.h"
#include "mongo/stdx/mutex.h"

namespace mongo {

class EphemeralForTestRecordStore : public RecordStore {
public:
    explicit EphemeralForTestRecordStore(StringData ns,
                                         std::shared_ptr<void>* dataInOut,
                                         bool isCapped = false,
                                         int64_t cappedMaxSize = -1,
                                         int64_t cappedMaxDocs = -1,
                                         CappedCallback* cappedCallback = nullptr);

    virtual const char* name() const;

    const std::string& getIdent() const override {
        return ns();
    }

    virtual RecordData dataFor(OperationContext* opCtx, const RecordId& loc) const;

    virtual bool findRecord(OperationContext* opCtx, const RecordId& loc, RecordData* rd) const;

    virtual void deleteRecord(OperationContext* opCtx, const RecordId& dl);

    virtual StatusWith<RecordId> insertRecord(
        OperationContext* opCtx, const char* data, int len, Timestamp, bool enforceQuota);

    virtual Status insertRecordsWithDocWriter(OperationContext* opCtx,
                                              const DocWriter* const* docs,
                                              const Timestamp*,
                                              size_t nDocs,
                                              RecordId* idsOut);

    virtual Status updateRecord(OperationContext* opCtx,
                                const RecordId& oldLocation,
                                const char* data,
                                int len,
                                bool enforceQuota,
                                UpdateNotifier* notifier);

    virtual bool updateWithDamagesSupported() const;

    virtual StatusWith<RecordData> updateWithDamages(OperationContext* opCtx,
                                                     const RecordId& loc,
                                                     const RecordData& oldRec,
                                                     const char* damageSource,
                                                     const mutablebson::DamageVector& damages);

    std::unique_ptr<SeekableRecordCursor> getCursor(OperationContext* opCtx,
                                                    bool forward) const final;

    virtual Status truncate(OperationContext* opCtx);

    virtual void cappedTruncateAfter(OperationContext* opCtx, RecordId end, bool inclusive);

    virtual Status validate(OperationContext* opCtx,
                            ValidateCmdLevel level,
                            ValidateAdaptor* adaptor,
                            ValidateResults* results,
                            BSONObjBuilder* output);

    virtual void appendCustomStats(OperationContext* opCtx,
                                   BSONObjBuilder* result,
                                   double scale) const;

    virtual Status touch(OperationContext* opCtx, BSONObjBuilder* output) const;

    virtual void increaseStorageSize(OperationContext* opCtx, int size, bool enforceQuota);

    virtual int64_t storageSize(OperationContext* opCtx,
                                BSONObjBuilder* extraInfo = NULL,
                                int infoLevel = 0) const;

    virtual long long dataSize(OperationContext* opCtx) const {
        return _data->dataSize;
    }

    virtual long long numRecords(OperationContext* opCtx) const {
        return _data->records.size();
    }

    virtual boost::optional<RecordId> oplogStartHack(OperationContext* opCtx,
                                                     const RecordId& startingPosition) const;

    void waitForAllEarlierOplogWritesToBeVisible(OperationContext* opCtx) const override {}

    virtual void updateStatsAfterRepair(OperationContext* opCtx,
                                        long long numRecords,
                                        long long dataSize) {
        invariant(_data->records.size() == size_t(numRecords));
        _data->dataSize = dataSize;
    }

protected:
    struct EphemeralForTestRecord {
        EphemeralForTestRecord() : size(0) {}
        EphemeralForTestRecord(int size) : size(size), data(new char[size]) {}

        RecordData toRecordData() const {
            return RecordData(data.get(), size);
        }

        int size;
        boost::shared_array<char> data;
    };

    virtual const EphemeralForTestRecord* recordFor(const RecordId& loc) const;
    virtual EphemeralForTestRecord* recordFor(const RecordId& loc);

public:
    //
    // Not in RecordStore interface
    //

    typedef std::map<RecordId, EphemeralForTestRecord> Records;

    bool isCapped() const {
        return _isCapped;
    }
    void setCappedCallback(CappedCallback* cb) {
        _cappedCallback = cb;
    }

private:
    class InsertChange;
    class RemoveChange;
    class TruncateChange;

    class Cursor;
    class ReverseCursor;

    StatusWith<RecordId> extractAndCheckLocForOplog(const char* data, int len) const;

    RecordId allocateLoc();
    bool cappedAndNeedDelete_inlock(OperationContext* opCtx) const;
    void cappedDeleteAsNeeded_inlock(OperationContext* opCtx);
    void deleteRecord_inlock(OperationContext* opCtx, const RecordId& dl);

    // TODO figure out a proper solution to metadata
    const bool _isCapped;
    const int64_t _cappedMaxSize;
    const int64_t _cappedMaxDocs;
    CappedCallback* _cappedCallback;

    // This is the "persistent" data.
    struct Data {
        Data(StringData ns, bool isOplog)
            : dataSize(0), recordsMutex(), nextId(1), isOplog(isOplog) {}

        int64_t dataSize;
        stdx::recursive_mutex recordsMutex;
        Records records;
        int64_t nextId;
        const bool isOplog;
    };

    Data* const _data;
};

}  // namespace mongo