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SWEN 383 Software Design Principles & Patterns The Proxy Pattern - - PowerPoint PPT Presentation
SWEN 383 Software Design Principles & Patterns The Proxy Pattern - - PowerPoint PPT Presentation
SWEN 383 Software Design Principles & Patterns The Proxy Pattern Basic Proxy * Overview Joe and Mary want to sign a contract. Joe is in Canada. Mary is in Argentina. * Overview Joe asks Sandy to be a proxy for Mary. Mary asks Pedro to
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Overview
Joe and Mary want to sign a contract. Joe is in Canada. Mary is in Argentina.
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Overview
Joe asks Sandy to be a proxy for Mary. Mary asks Pedro to be a proxy for Joe.
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Overview
Joe “agrees with” Sandy as Mary’s stand-in. Mary “agrees with” Pedro as Joe’s stand-in.
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Overview
Joe “agrees with” Sandy as Mary’s stand-in. Mary “agrees with” Pedro as Joe’s stand-in.
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Overview
Joe and Mary now have a legal contract.
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Health-care proxy
Joe needs to make health care decisions for his mother Jane’s surgery. The had a previous agreement through a Health-care proxy
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Basic Proxy
What is the primary design issue addressed by the Proxy pattern?
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Proxy vs. Adapter
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Proxy vs. Adapter
How are proxies and adapters similar?
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Proxy vs. Adapter
How are proxies and adapters different?
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Virtual Proxy
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Virtual Proxy
What is the purpose of a virtual proxy?
Lazy Loading..
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Remote Proxy
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Remote Proxy
What is the purpose of a Remote proxy?
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Remote Proxy
How does a Remote proxy work?
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Remote Proxy
How might a remote proxy be used in a browser that manipulates information on a web server?
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Remote Proxy
How might a remote proxy be used in a browser that manipulates information on a web server?
Node A Node B
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A(proxy) A A B
The MAGIC SAUCE!
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Protection Proxy
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Protection Proxy
What is the purpose of a protection proxy?
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