From 000e22246fccde741f2a748dc08eed5e21edcba0 Mon Sep 17 00:00:00 2001
From: Mathew Sutcliffe <oktal3700@gmail.com>
Date: Wed, 8 Jun 2016 21:39:12 +0100
Subject: [PATCH] Caches: method to query keys of all unsaved values.

---
 src/blackmisc/valuecache.cpp | 11 +++++++++++
 src/blackmisc/valuecache.h   |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/src/blackmisc/valuecache.cpp b/src/blackmisc/valuecache.cpp
index 53d2ec9d8..39e99b655 100644
--- a/src/blackmisc/valuecache.cpp
+++ b/src/blackmisc/valuecache.cpp
@@ -201,6 +201,17 @@ namespace BlackMisc
         return map;
     }
 
+    QStringList CValueCache::getAllUnsavedKeys(const QString &keyPrefix) const
+    {
+        QMutexLocker lock(&m_mutex);
+        QStringList keys;
+        for (const auto &element : elementsStartingWith(keyPrefix))
+        {
+            if (element->m_value.isValid() && ! element->m_saved) { keys.push_back(element->m_key); }
+        }
+        return keys;
+    }
+
     void CValueCache::insertValues(const CValueCachePacket &values)
     {
         QMutexLocker lock(&m_mutex);
diff --git a/src/blackmisc/valuecache.h b/src/blackmisc/valuecache.h
index 70f7cb6b8..99eaea01d 100644
--- a/src/blackmisc/valuecache.h
+++ b/src/blackmisc/valuecache.h
@@ -171,6 +171,10 @@ namespace BlackMisc
         //! \threadsafe
         BlackMisc::CValueCachePacket getAllValuesWithTimestamps(const QString &keyPrefix = {}) const;
 
+        //! Return keys of all values which have been changed but not saved.
+        //! \threadsafe
+        QStringList getAllUnsavedKeys(const QString &keyPrefix = {}) const;
+
         //! Add some values to the cache.
         //! Values already in the cache will remain in the cache unless they are overwritten.
         //! \threadsafe