ephemeral_for_test_engine.h

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// ephemeral_for_test_engine.h

#pragma once

#include <memory>

#include "mongo/db/storage/journal_listener.h"
#include "mongo/db/storage/kv/kv_engine.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/string_map.h"

namespace mongo {

class JournalListener;

class EphemeralForTestEngine : public KVEngine {
public:
    virtual RecoveryUnit* newRecoveryUnit();

    virtual Status createRecordStore(OperationContext* opCtx,
                                     StringData ns,
                                     StringData ident,
                                     const CollectionOptions& options);

    virtual std::unique_ptr<RecordStore> getRecordStore(OperationContext* opCtx,
                                                        StringData ns,
                                                        StringData ident,
                                                        const CollectionOptions& options);

    virtual Status createSortedDataInterface(OperationContext* opCtx,
                                             StringData ident,
                                             const IndexDescriptor* desc);

    virtual SortedDataInterface* getSortedDataInterface(OperationContext* opCtx,
                                                        StringData ident,
                                                        const IndexDescriptor* desc);

    virtual Status beginBackup(OperationContext* opCtx) {
        return Status::OK();
    }

    virtual void endBackup(OperationContext* opCtx) {}

    virtual Status dropIdent(OperationContext* opCtx, StringData ident);

    virtual bool supportsDocLocking() const {
        return false;
    }

    virtual bool supportsDirectoryPerDB() const {
        return false;
    }

    virtual bool isDurable() const {
        return false;
    }

    virtual bool isEphemeral() const {
        return true;
    }

    virtual int64_t getIdentSize(OperationContext* opCtx, StringData ident);

    virtual Status repairIdent(OperationContext* opCtx, StringData ident) {
        return Status::OK();
    }

    virtual void cleanShutdown(){};

    virtual bool hasIdent(OperationContext* opCtx, StringData ident) const {
        return _dataMap.find(ident) != _dataMap.end();
        ;
    }

    std::vector<std::string> getAllIdents(OperationContext* opCtx) const;

    void setJournalListener(JournalListener* jl) final {
        stdx::unique_lock<stdx::mutex> lk(_mutex);
        _journalListener = jl;
    }

    virtual Timestamp getAllCommittedTimestamp() const override {
        MONGO_UNREACHABLE;
    }

private:
    typedef StringMap<std::shared_ptr<void>> DataMap;

    mutable stdx::mutex _mutex;
    DataMap _dataMap;  // All actual data is owned in here

    // Notified when we write as everything is considered "journalled" since repl depends on it.
    JournalListener* _journalListener = &NoOpJournalListener::instance;
};
}