question on getChannel() synchronization in RAFContainer4.java

[Mike Matrigali]

getChannel() has comments that say callers should synchronize when 
calling.

1) why not just put the synchronization in this routine?
2) There are 3 calls in this file that are not synchronized, is that a 
problem?  (writeAtOffset and getEmbryonicPage and 
getChannel(StorageRandomAccessFile file)

I have no idea if this is a problem at all, just trying to guess at a 
cause for  	 DERBY-3607