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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition To elaborate on the roles of the variables above: The protoVersion variable contains an integer that indicates the version of the discovery protocol This will permit interoperability between different protocol versions For the current version of the discovery protocol, protoVersion must have the value 1 The port variable contains the TCP port respondents must connect to in order to continue the discovery process The groups variable contains a set of strings (organized as an array) naming the groups the entity wishes to discover This set may be empty, which indicates that all lookup services are being looked for The heard variable contains a set of netjinicorelookupServiceID objects (organized as an array) that identify lookup services from which this entity has already heard and that do not need to respond to this request The packetBody variable contains the marshalled discovery request in a form that is suitable for putting into a datagram packet or writing to an output stream The table below illustrates the contents of a multicast request packet body If the size of the packet body should exceed 512 bytes, the set of lookups from which an entity has heard must be left incomplete in the packet body, such that the size of the packet body will come to 512 bytes or less How this is done is not specified It is not permissible for implementations to simply truncate packets at 512 bytes Similarly, if the number of groups requested causes the size of a packet body to exceed 512 bytes, implementations must perform several separate multicasts, each with a disjoint subset of the full set of groups to be requested, until the entire set has been requested Each request must contain the largest set of responses heard that will keep the size of the request below 512 bytes
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DJ224 The Multicast Response Service
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Unlike the multicast request service, the multicast response service is a normal TCP based service In this service the multicast response client contacts the multicast response server specified in a multicast request, after which unicast discovery is performed The multicast response server to contact can be determined by using the source address of the request that has been received, along with the port number encapsulated in that request The only difference between the unicast discovery performed in this instance and the normal case is that the entity being connected to initiates unicast discovery, not the connecting entity An alternative way of looking at this is that in both cases, once the connection has been established, the party that is looking for a lookup service proxy initiates unicast discovery DJ23 Discovery Using the Multicast Request Protocol Now we describe the discovery sequence for local area network (LAN) based environments that use the multicast request protocol to discover one or more djinns
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DJ231 Steps Taken by the Discovering Entity
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The entity that wishes to discover a djinn takes the following steps: 1 It establishes a multicast request client, which will send packets to the well known multicast network endpoint on which the multicast request service operates 2 It establishes a TCP server socket that listens for incoming connections, over which the unicast discovery protocol is used This server socket is the multicast response server socket 3 It creates a set of netjinicorelookupServiceID objects This set contains service IDs for lookup services from which it has already heard, and is initially empty
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition 4 It sends multicast requests at periodic intervals Each request contains connection information for its multicast response server, along with the most recent set of service IDs for lookup services it has heard from 5 For each response it receives via the multicast response service, it adds the service ID for that lookup service to the set it maintains 6 The entity continues multicasting requests for some period of time Once this point has been reached, it unexports its multicast response server and stops making multicast requests 7 If the entity has received sufficient references to lookup services at this point, it is now finished Otherwise, it must start using the multicast announcement protocol The interval at which requests are performed is not specified, though an interval of five seconds is recommended for most purposes Similarly, the number of requests to perform is not mandated, but we recommend seven Since requests may be broken down into a number of separate multicasts, these recommendations do not pertain to the number of packets to be sent
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