Host cache agents, Computer Engineering

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Your task is to program software agents able to send and receive messages according to the two Gnutella protocols above.

Your solution should have two types of agents: 

  •  Agents to simulate host caches - host caches supply information about which servent(s) are available. 
  •  Agents to simulate servents - servents come and go; when they go, they must let the host caches know about it. The fist time a servent connects to the network, they interact with the host cache agents as below, then they interact with other servents.

Host Cache Agents

You should program a host cache agent to behave as follows: 

1.  The first time a servent enters the network, it interacts with the host cache to "introduce" itself. The host cache should keep a record of all servents, and their status (online or offline). The host cache should be able to detect when a servent is returning or if it is its first time connecting to the network 

2.  After the registration is finished (if it is the first time the servent joins the network) or after updating the status of the servent (if a returning servent), the host cache supplies the servent with another servent id; these two servents interact as explained below.  The number of host caches is fixed; you are free to choose how many, but it should be more than one. Notice that the host caches are exactly the same, that is, they behave in the same and they only differ in their ids and the servents they have in their records. 

Servent Agents

You should program a servent agent to behave as follows:

1.  The servent initially interacts with the host cache agents to obtain one (1) servent it can "ping". If this is its first time joining the network, the host cache "registers" the new servent. 

2.  In possession of one servent id, the servent agent uses the "ping-pong" protocol to find out at most 4 (four) other servents (this number includes the servent whose if the host cache provided). This step should ensure each servent ends up with 4 neighbours

3.  When a servent agent receives a ping from another agent, it replies with a pong, but also forwards the "ping" message to one of its neighbours, as explained in our lectures. This forwarding of "ping" messages should go on for 3 "hops", guaranteeing that the servent that initiates the protocol ends up with 4 neighbours. 

4.  After the servent agent gets to "know" other servents, then it should search for a number of files. 

5.  The search should have a "TTL" (time-to-live) of n hops, where n is a parameter of the system (that is, it should not be hardcoded). The search should follow the peer-to-peer "flooded request" search algorithm, studied in our lectures.


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