Please Help Me..

hi,everyone:
i have some problems to handle blobmessage.
My environments are:
Tomcat 6.0
Apache FTPServer 1.0.6
ActiveMQ 5.8.0

ActiveMQ message trans type is: publish/subcribe

now, i have a producer of publisher with topic and blobmessage,session mode
persistent,auto acknowledge.

the file size about 30MB,upload to ftp server
withpolicy:tcp://localhost:61616?jms.blobTransferPolicy.defaultUploadUrl=ftp://localhost:21/.

then, client with subcriber to recive the blobmessage.

my problem is:
1. how to get the message status that downloaded file,recive success.
2. how and when delete the file from the blobmessage in ftp server.

newbie,thanks a lot