@Olaf:

Looking at the API you proposed

 public interface StreamingHandler<K>  {
     void writeToKey(K key, InputStream largeObject);
     OutputStream writeToKey(K key);
     InputStream readFromKey(K key);
     boolean removeKey(K key);
     StreamingHandler<K> withFlags(Flag... flags);
 }

and what I actually need:

* http://code.google.com/p/googleappengine/source/browse/trunk/java/src/main/com/google/appengine/api/files/FileService.java

--> see openRecordWriteChannel and openRecordReadChannel

Where the read has a way of jumping back&forth in the channel,

and write can seal the written bytes with closeFinally.

* http://code.google.com/p/googleappengine/source/browse/trunk/java/src/main/com/google/appengine/api/files/FileReadChannel.java

* http://code.google.com/p/googleappengine/source/browse/trunk/java/src/main/com/google/appengine/api/files/FileWriteChannel.java

Hence I guess we could change it to

Closeable writeToKey(K key, InputStream largeObject); -- returning a handle to seal off (making it immutable from then on)

InputStream readFromKey (K key, long position); -- also taking position into consideration

Wdyt?

(unfortunately I also don't have the time to help with impl,

but I'm definitely willing to test it (since I need it anyway, right :-)))

-Ales