Made pipeline preprocessing synchronous.

Instead of having the asynchronous preprocessor concept with different
pipelines for new/modify/delete we have a single pipeline with
synchronous preprocessors that act upon new/modify/delete.
This keeps the code simpler due to lack of asynchronity and keeps the
new/modify/delete operations together (which at least for the indexing
makes a lot of sense).
Not supporting asynchronity is ok because the tasks done in
preprocessing are not cpu intensive (if they were we had a problem
since they are directly involved in the round-trip time), and the main
cost comes from i/o, meaning we don't gain much by doing multithreading.
Costly tasks (such as full-text indexing) should rather be implemented
as post-processing, since that doesn't increase the round-trip time directly,
and eventually consistent is typically good enough for that.

1 files changed, 1 insertions, 0 deletions

diff --git a/common/genericresource.h b/common/genericresource.h
index cfc6653..33de0e7 100644
--- a/common/genericresource.h
+++ b/common/genericresource.h
@@ -48,6 +48,7 @@ public:
 
     int error() const;
 
+    static void removeFromDisk(const QByteArray &instanceIdentifier);
 private Q_SLOTS:
     void updateLowerBoundRevision();