oplog upload/download (#214)

- Feature: Zen server endpoint `prj/{project}/oplog/{log}/chunks` to post multiple attachments in one request.
- Feature: Zen server endpoint `prj/{project}/oplog/{log}/save` to save an oplog container. Accepts `CbObject` containing a compressed oplog and attachment references organized in blocks. 
- Feature: Zen server endpoint `prj/{project}/oplog/{log}/load` to request an oplog container. Responds with an `CbObject` containing a compressed oplog and attachment references organized in blocks.
- Feature: Zen server endpoint `{project}/oplog/{log}/rpc` to initiate an import to or export from an external location and other operations. Use either JSon or CbPackage as payload.
  - CbObject/JSon RPC format for `import` and `export` methods:
  - CbObject RPC format for `getchunks` method, returns CbPackage with the found chunks, if all chunks are found the number of attachments matches number of chunks requested.
- Feature: Zen server `{project}/oplog/{log}/{hash}` now accepts `HttpVerb::kPost` as well as `HttpVerb::kGet`.
- Feature: Zen command line tool `oplog-export` to export an oplog to an external target using the zenserver oplog export endpoint.
- Feature: Zen command line tool `oplog-import` to import an oplog from an external source using the zenserver oplog import endpoint.

1 files changed, 9 insertions, 0 deletions

diff --git a/zencore/include/zencore/thread.h b/zencore/include/zencore/thread.h
index 2aad22061..a9c96d422 100644
--- a/zencore/include/zencore/thread.h
+++ b/zencore/include/zencore/thread.h
@@ -163,6 +163,15 @@ public:
 
 	std::ptrdiff_t Remaining() const { return Counter.load(); }
 
+	// If you want to add dynamic count, make sure to set the initial counter to 1
+	// and then do a CountDown() just before wait to not trigger the event causing
+	// false positive completion results.
+	void AddCount(std::ptrdiff_t Count)
+	{
+		std::atomic_ptrdiff_t Old = Counter.fetch_add(Count);
+		ZEN_ASSERT_SLOW(Old > 0);
+	}
+
 	bool Wait(int TimeoutMs = -1)
 	{
 		std::ptrdiff_t Old = Counter.load();