org.rutil.collection.trie
Interface DataSourceCallback<VALUE_TYPE>

All Known Implementing Classes:

FileDataSourceCallback

public interface DataSourceCallback<VALUE_TYPE>

Author:

mohan

Method Summary

boolean	exists(long key) Check if the key exists
VALUE_TYPE	fetch(long key) Fetch the value associated with the given key.
long	save(VALUE_TYPE value) Saves the given value to the backing datastore and returns a unique key to reference this value.

Method Detail

save

long save(VALUE_TYPE value)

Saves the given value to the backing datastore and returns a unique key to reference this value.

Parameters:

value -

Returns:

unique key that maps to the value

fetch

VALUE_TYPE fetch(long key)
                 throws KeyNotFoundException

Fetch the value associated with the given key.

Parameters:

key -

Returns:

value if a mapping exists for the given key or null

Throws:

KeyNotFoundException - if key does not exist.

exists

boolean exists(long key)

Check if the key exists

Parameters:

key -

Returns:

true if the key exists, false otherwise.