refs #494 Get the filename used for serializing a specific cached value, or list of all files used by whole cache.

src/blackmisc/valuecache.cpp

@@ -278,6 +278,19 @@ namespace BlackMisc
         return {};
     }
 
+    QString CValueCache::filenameForKey(const QString &key)
+    {
+        return key.section('/', 0, 0) + ".json";
+    }
+
+    QStringList CValueCache::enumerateFiles(const QString &dir) const
+    {
+        auto values = getAllValues();
+        QSet<QString> files;
+        for (auto it = values.begin(); it != values.end(); ++it) { files.insert(dir + "/" + filenameForKey(it.key())); }
+        return files.toList();
+    }
+
     void CValueCache::clearAllValues(const QString &keyPrefix)
     {
         QMutexLocker lock(&m_mutex);
@@ -393,6 +406,11 @@ namespace BlackMisc
         return error;
     }
 
+    const QString &CValuePage::getKey(const Element &element) const
+    {
+        return element.m_key;
+    }
+
     qint64 CValuePage::getTimestamp(const Element &element) const
     {
         return element.m_timestamp;

src/blackmisc/valuecache.h

@@ -121,6 +121,16 @@ namespace BlackMisc
         //! \threadsafe
         CStatusMessage loadFromFiles(const QString &directory);
 
+        //! Return the (relative) filename that may is (or would be) used to save the value with the given key.
+        //! The file may or may not exist (because it might not have been saved yet).
+        //! \threadsafe
+        static QString filenameForKey(const QString &key);
+
+        //! List the Json files which are (or would be) used to save the current values.
+        //! The files may or may not exist (because they might not have been saved yet).
+        //! \threadsafe
+        QStringList enumerateFiles(const QString &directory) const;
+
         //! Clear all values from the cache.
         //! \threadsafe
         void clearAllValues(const QString &keyPrefix = {});
@@ -219,6 +229,9 @@ namespace BlackMisc
         //! Write a new value. Must be called from the thread in which the owner lives.
         CStatusMessage set(const T &value) { return m_page.setValue(m_element, CVariant::from(value)); }
 
+        //! Get the key string of this value.
+        const QString &getKey() const { return m_page.getKey(m_element); }
+
         //! Return the time when this value was updated.
         QDateTime getTimestamp() const { return m_page.getTimestamp(m_element); }
 

src/blackmisc/valuecache_private.h

@@ -64,6 +64,9 @@ namespace BlackMisc
             //! Write the value corresponding to the element's key and begin synchronizing it to any other pages.
             CStatusMessage setValue(Element &element, const CVariant &value);
 
+            //! Get the key string corresponding to the element.
+            const QString &getKey(const Element &element) const;
+
             //! Get the timestamp corresponding to the element.
             qint64 getTimestamp(const Element &element) const;