Searching for shared Searching for Shared Resources Resources Important to P2P applications a Two distinct categories: Two distinct categories Client-side searching Server-side searching A server acts as the reservoir of all c地m The greatest advantage is that the user need Client-side searching is limited to the users Connection may be made of only to peers that Faster than server-side searching May send an avalanche of requests and may low down server's services Searching Technique in P2P Chapter 7: P2P Application Models development Searching for content in pure P2P-based model Searching for content in P2P with simple discovery P2P application design Searching for content in P2P with discovery and Both server-side and client-side searching can be adopted Searching for content in P2P with discovery, lookup and content server-based model nly server-side searching can be adopted Case P2P Application Structure of the P2P Application File sharing takes place between two connected peers regardless of file extensIo Three components Listener: Handles requests of incoming peer connections Server: Maintains the database required for the application Browser: Shows results to the peer through a user-friendly interface and acts as an interactive layer for the clien7 哈工大计算机学院 李全龙 Network Application Development P2P Application Development 37 Searching for Shared Resources „ Important to P2P applications „ Two distinct categories: „ Server-side searching „ A server acts as the reservoir of all information „ The greatest advantage is that the user need not worry about the location of a file „ Connection may be made of only to peers that possess required content „ May send an avalanche of requests and may slow down server’s services 哈工大计算机学院 李全龙 Network Application Development P2P Application Development 38 Searching for Shared Resources „ Two distinct categories: „ Client-side searching „ Comes into play when peers are connected with each other and are communicating without the involvement of any other machine or server „ Client-side searching is limited to the user’s machine „ Faster than server-side searching 哈工大计算机学院 李全龙 Network Application Development P2P Application Development 39 Searching Technique in P2P Models „ Searching for content in pure P2P-based model „ Client-side searching „ Searching for content in P2P with simple discovery server-based model „ Client-side searching also „ Searching for content in P2P with discovery and lookup server-based model „ Both server-side and client-side searching can be adopted „ Searching for content in P2P with discovery, lookup, and content server-based model „ Only server-side searching can be adopted 哈工大计算机学院 李全龙 Network Application Development P2P Application Development 40 Chapter 7: P2P Application development Chapter goal: „ P2P application model „ P2P application design „ P2P example 哈工大计算机学院 李全龙 Network Application Development P2P Application Development 41 Case P2P Application „ File sharing takes place between two connected peers regardless of file extensions „ Three components: „ Listener: Handles requests of incoming peer connections „ Server: Maintains the database required for the application „ Browser: Shows results to the peer through a user-friendly interface and acts as an interactive layer for the client 哈工大计算机学院 李全龙 Network Application Development P2P Application Development 42 Structure of the P2P Application