Hi Rajendra,
Your code looks good.
DotCMIS doesn't buffer the content. It reads 4k blocks from the stream
and sends them. HTTP chunking is turned on by default. That is, also the
HTTP client shouldn't (!) buffer the content.
Does SPFile.OpenBinaryStream buffer the content under some
circumstances?
- Florian
Hi there,
I am working on SharePoint 2010 (CMIS client) to FileNet P8 5.1 (CMIS
Server 1.0) content transfer using CMIS and here we are implementing
DotCMIS library in SharePoint to initiate file transfer requests
targeted for FileNet. We have large files transfer scenarios and while
doing some performance tests, memory consumption on SharePoint (the
client) is too high. I would like your help to suggest how could I
improve these transfers.
The implementation is using AtomPub binding and streaming the file
content from a document available in SharePoint library. During the
SetContentStream operation, Modified Physical Memory equivalent to the
size of the file being transferred becomes Not Available (for example,
for 2 gb file, about 2 gb memory becomes Not Available) and hence the
Free Memory on the server is reduced by that file size. Once the
transfer operation is completed, this physical memory becomes
available once again.
We are trying to achieve a high performance solution and may consider
multiple threads to transfer a few files simultaneously. If each
process is blocking a large chunk of memory, we will be limited to 1
or max 2 threads at a time. Is there any code tuning or correction
required in the connection/session object to achieve better results?
Please consider the code provided below.
This is the code from CMIS client (SharePoint ) ---
Dictionary<string, string> parameters = new Dictionary<string,
string>();
// RESTful
parameters[DotCMIS.SessionParameter.BindingType] = BindingType.AtomPub;
parameters[DotCMIS.SessionParameter.AtomPubUrl] = "<AtomPubUrl>";
parameters[DotCMIS.SessionParameter.RepositoryId] = "<RepositoryID>";
parameters[DotCMIS.SessionParameter.User] = "<username>";
parameters[DotCMIS.SessionParameter.Password] = "<password>";
parameters[DotCMIS.SessionParameter.Compression] = "true"; // turn on
HTTP response compression
parameters[DotCMIS.SessionParameter.ConnectTimeout] = "600000"; // 10
minutes // HTTP connect timeout in milliseconds; -1 for infinite
parameters[DotCMIS.SessionParameter.ReadTimeout] = "600000"; // 10
minutes // -1 for infinite
SessionFactory factory = SessionFactory.NewInstance();
session = factory.CreateSession(parameters);
IFolder cmisFolder = (IFolder)session.GetObjectByPath("/cmis test");
SPFile file =
SPContext.Current.Web.GetFile("http://<server>/sites/TS/Shared%20Documents/bigfile.txt");
Dictionary<string, object> properties = new Dictionary<string,
object>()
{
{"cmis:name", file.Title },
{"cmis:objectTypeId", "cmis:document"},
};
Stream stream =
file.OpenBinaryStream(SPOpenBinaryOptions.SkipVirusScan);
IDocument doc = cmisFolder.CreateDocument(properties, null,
VersioningState.CheckedOut);
IObjectFactory objectFactory = session.ObjectFactory;
ContentStream contentStream =
(ContentStream)objectFactory.CreateContentStream(file.Title,
file.Length, "text/plain", stream);
doc.SetContentStream(contentStream, true, false);
doc.CheckIn(true, null, null, "optional check in comment");
Thanks
Rajendra Sethi
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