journal_listener.h

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#pragma once

#include "mongo/db/repl/optime.h"

namespace mongo {

class JournalListener {
public:
    using Token = repl::OpTime;
    virtual ~JournalListener() = default;
    virtual Token getToken() = 0;
    virtual void onDurable(const Token& token) = 0;
};

class NoOpJournalListener : public JournalListener {
public:
    virtual ~NoOpJournalListener() = default;
    virtual JournalListener::Token getToken() {
        return JournalListener::Token();
    }
    virtual void onDurable(const Token& token) {}
    // As this has no state, it is de facto const and can be safely shared freely.
    static NoOpJournalListener instance;
};
}