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==Proxy Design Pattern==
When a request is made to a Proxy, the real object is then instantiated and from then on any further requests are made to the real object. There are many four common situations in which where a proxy Proxy pattern is required:<br />
<ul>
first referenced, and checking that the object is locked before access so that no other
object may change it.</li>
</ul>
<br />
There are several other proxy pattern situations less common in design:
<br />
<ul>
<li><b>Copy-on-Write Proxy</b></li>
<li><b>Cache Proxy</b></li>
<li><b>Firewall Proxy</b></li>
<li><b>Synchronization Proxy</b></li>
</ul>
