# HG changeset patch
# User Chris Cannam
# Date 1591189070 -3600
# Node ID 7b6e18380e8fd6a83a7f17aa2aa099a5bc5444a7
# Parent  166d7a4c2cd657f91542e5eb95903bacfbf6eb0f
Make it possible to check whether the transforms have been populated yet

diff -r 166d7a4c2cd6 -r 7b6e18380e8f transform/TransformFactory.cpp
--- a/transform/TransformFactory.cpp	Wed Jun 03 13:57:37 2020 +0100
+++ b/transform/TransformFactory.cpp	Wed Jun 03 13:57:50 2020 +0100
@@ -102,7 +102,9 @@
 TransformFactory::UninstalledTransformsPopulateThread::run()
 {
     m_factory->m_populatingSlowly = true;
-    sleep(1);
+    while (!m_factory->havePopulated()) {
+        sleep(1);
+    }
     m_factory->populateUninstalledTransforms();
 }
 
@@ -324,6 +326,13 @@
     return tr("Other");
 }
 
+bool
+TransformFactory::havePopulated()
+{
+    MutexLocker locker(&m_transformsMutex, "TransformFactory::havePopulated");
+    return m_transformsPopulated;
+}
+
 void
 TransformFactory::populateTransforms()
 {
@@ -395,6 +404,12 @@
     }            
 
     m_transformsPopulated = true;
+
+#ifdef DEBUG_TRANSFORM_FACTORY
+    SVCERR << "populateTransforms exiting" << endl;
+#endif
+
+    emit transformsPopulated();
 }
 
 void
@@ -743,6 +758,8 @@
 #ifdef DEBUG_TRANSFORM_FACTORY
     SVCERR << "populateUninstalledTransforms exiting" << endl;
 #endif
+
+    emit uninstalledTransformsPopulated();
 }
 
 Transform
diff -r 166d7a4c2cd6 -r 7b6e18380e8f transform/TransformFactory.h
--- a/transform/TransformFactory.h	Wed Jun 03 13:57:37 2020 +0100
+++ b/transform/TransformFactory.h	Wed Jun 03 13:57:50 2020 +0100
@@ -78,6 +78,13 @@
     typedef std::map<TransformId, TextMatcher::Match> SearchResults;
     SearchResults search(QString keyword);
     SearchResults search(QStringList keywords);
+
+    /**
+     * Return true if the transforms have been populated, i.e. a call
+     * to something like haveTransform() will return without having to
+     * do the work of scanning plugins
+     */
+    bool havePopulated();
     
     /**
      * Return true if the given transform is known.
@@ -191,6 +198,10 @@
     QString getStartupFailureReport() const {
         return m_errorString;
     }
+
+signals:
+    void transformsPopulated();
+    void uninstalledTransformsPopulated();
     
 protected:
     typedef std::map<TransformId, TransformDescription> TransformDescriptionMap;