| org.apache.helix.store.PropertyChangeListener<T> |
Callback interface on property changes
| Public Methods | |||||||||||
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Callback function when there is a change in any property that starts with key
It's upto the implementation to handle the following different cases 1) key
is a simple key and does not have any children.
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Callback function when there is a change in any property that starts with key It's upto the implementation to handle the following different cases 1) key is a simple key and does not have any children. PropertyStore.getProperty(key) must be used to retrieve the value; 2) key is a prefix and has children. PropertyStore.getPropertyNames(key) must be used to retrieve all the children keys. Its important to know that PropertyStore will not be able to provide the delta[old value,new value] or which child was added/deleted. The implementation must take care of the fact that there might be callback for every child thats added/deleted. General way applications handle this is keep a local cache of keys and compare against the latest keys.