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Ilkka Seppälä 2014-08-24 20:13:21 +03:00
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##Proxy
**Intent:** Provide a surrogate or placeholder for another object to control access to it.
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/proxy/etc/proxy.jpg "Proxy")
**Applicability:** Proxy is applicable whenever there is a need for a more versatile or sophisticated reference to an object than a simple pointer. here are several common situations in which the Proxy pattern is applicable
* a remote proxy provides a local representative for an object in a different address space.
* a virtual proxy creates expensive objects on demand.
* a protection proxy controls access to the original object. Protection proxies are useful when objects should have different access rights.
##Chain of responsibility
**Intent:** Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object handles it.