question about peeking entry from cache

[voipp]

Hi all! There is method that peek cache entry from a cache
org.apache.ignite.internal.processors.cache.GridCacheAdapter#peekEx(java.lang.Object)

And there is another method:

org.apache.ignite.internal.processors.cache.GridCacheMapEntry#peek(boolean,
boolean, boolean,
org.apache.ignite.internal.processors.cache.IgniteCacheExpiryPolicy)

What is the difference between them?
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*Best Regards,*

*Kuznetsov Aleksey*