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#pragma once
#include "sink_export.h"
#include <QObject>
#include <QByteArrayList>
#include <string>
#include <functional>
#include <QString>
#include <KAsync/Async>
#include "storage.h"
/**
* A persistent FIFO message queue.
*/
class SINK_EXPORT MessageQueue : public QObject
{
Q_OBJECT
public:
enum ErrorCodes
{
NoMessageFound
};
class Error
{
public:
Error(const QByteArray &s, int c, const QByteArray &m) : store(s), message(m), code(c)
{
}
QByteArray store;
QByteArray message;
int code;
};
MessageQueue(const QString &storageRoot, const QString &name);
~MessageQueue();
void startTransaction();
void enqueue(void const *msg, size_t size);
void enqueue(const QByteArray &value);
// Dequeue a message. This will return a new message everytime called.
// Call the result handler with a success response to remove the message from the store.
// TODO track processing progress to avoid processing the same message with the same preprocessor twice?
void dequeue(const std::function<void(void *ptr, int size, std::function<void(bool success)>)> &resultHandler, const std::function<void(const Error &error)> &errorHandler);
KAsync::Job<void> dequeueBatch(int maxBatchSize, const std::function<KAsync::Job<void>(const QByteArray &)> &resultHandler);
bool isEmpty();
public slots:
void commit();
signals:
void messageReady();
void drained();
private slots:
void processRemovals();
private:
Q_DISABLE_COPY(MessageQueue);
Sink::Storage::DataStore mStorage;
Sink::Storage::DataStore::Transaction mWriteTransaction;
QByteArrayList mPendingRemoval;
};
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