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The details of the multicast announcement protocol are simple The entity that runs the lookup service takes the following steps: 1 It constructs a datagram socket object, set up to send to the well known multicast endpoint on which the multicast announcement service operates 2 It establishes the server side of the unicast discovery service 3 It multicasts announcement packets at intervals The length of the interval is not mandated, but 120 seconds is recommended An entity that wishes to listen for multicast announcements performs the following set of steps: 1 It establishes a set of service IDs of lookup services from which it has already heard, using the set discovered by using the multicast request protocol as the initial contents of this set 2 It binds a datagram socket to the well known multicast endpoint on which the multicast announcement service operates and listens for incoming multicast announcements 3 For each announcement received, it determines whether the service ID in that announcement is in the set from which it has already heard If so, or if the announcement is for a group that is not of interest, it ignores the announcement Otherwise, it performs unicast discovery using the host and port in the announcement to obtain a reference to the announced lookup service, and then adds this service ID to the set from which it has already heard
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition DJ25 Unicast Discovery While workgroup level devices need to be able only to discover local djinns, a user might need to be able to access services in djinns that may be dispersed more widely (for example in offices in other cities or on other continents) To this end, the software at the user's fingertips must be able to obtain a reference to the lookup service of a remote djinn This is done using the unicast discovery protocol The unicast Jini discovery protocol uses the underlying reliable unicast transport protocol provided by the network instead of the unreliable multicast transport In the case of IP based networks this means that the unicast discovery protocol uses unicast TCP instead of multicast UDP
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The unicast discovery protocol is a simple request response protocol If an entity wishes to obtain a reference to a given djinn, the entity has a lookup locator object for that djinn and makes a TCP connection to the host and port specified by that lookup locator It sends a unicast discovery request (see below), to which the remote host responds If a lookup service is responding to a multicast request, the request to which it is responding contains the address and port to respond to, and it makes a TCP connection to that address and port The respondee sends a unicast discovery request, and the lookup service responds with a proxy The protocol diagram in Figure DJ22 illustrates the flow when unicast discovery is initiated by a discovering entity
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Figure DJ22 Unicast Discovery Initiated by a Discovering Entity
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The protocol diagram in Figure DJ23 indicates the flow when a lookup service initiates unicast discovery in response to a multicast request
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Figure DJ23 Unicast Discovery Initiated by a Lookup Service
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A discovery request consists of a stream of data as would be obtained by writing code similar to the following:
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int protoVersion; // protocol version javaioByteArrayOutputStream byteStr = new javaioByteArrayOutputStream(); javaioDataOutputStream objStr = new javaioDataOutputStream(byteStr); objStrwriteInt(protoVersion); byte[] requestBody = byteStrtoByteArray(); // final result
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The protoVersion variable above must have a value of 1 for the current version of the unicast discovery protocol The requestBody variable contains the discovery request as would be sent to the unicast discovery request service
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The response to the above request consists of a stream of data as would be obtained by writing code similar to the following:
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netjinicorelookupServiceRegistrar reg; String[] groups; // groups registrar will respond with javarmiMarshalledObject obj = new javarmiMarshalledObject(reg); javaioByteArrayOutputStream byteStr = new javaioByteArrayOutputStream(); javaioObjectOutputStream objStr = new javaioObjectOutputStream(byteStr); objStrwriteObject(obj); objStrwriteInt(groupslength); for (int i = 0; i < groupslength; i++) { objStrwriteUTF(groups[i]); } byte[] responseBody = byteStrtoByteArray(); // final result
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When the discovering entity receives this data stream, it can deserialize the MarshalledObject it has been sent and use the get method of that object to obtain a lookup service registrar for that djinn
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