Listeners: What are conflict listeners and how to work with them?

To allow users to handle document replication conflicts automatically, we introduced a Document Conflict listener. To create your own listener of this type, just implement IDocumentConflictListener interface.

public interface IDocumentConflictListener
{
bool TryResolveConflict(string key, JsonDocument[] conflictedDocs, 
						out JsonDocument resolvedDocument);
}

Example

This example shows how to create an automatic conflict resolver by using IDocumentConflictListener, which will pick the newest item from the list of conflicted documents:

public class ResolveInFavourOfNewest : IDocumentConflictListener
{
public bool TryResolveConflict(
	string key,
	JsonDocument[] conflictedDocs,
	out JsonDocument resolvedDocument)
{
	DateTime? maxDate = conflictedDocs.Max(x => x.LastModified);
	resolvedDocument = conflictedDocs
						.FirstOrDefault(x => x.LastModified == maxDate);

	if (resolvedDocument == null)
		return false;

	resolvedDocument.Metadata.Remove("@id");
	resolvedDocument.Metadata.Remove("@etag");
	return true;
}
}