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Section: DU Jini Discovery Utilities Specification
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The utilities presented in this section of the specification are useful when implementing higher level utilities or other entities or components that will be involved in the Jini discovery process These utilities encapsulate functionality that allow one to exercise more control when interacting with the Jini discovery protocols Anyone wishing to provide their own implementation of the Jini lookup service or their own implementation of the discovery utilities presented previously in this specification, may find the utilities presented in this section useful when creating those alternate implementations DU61 The Constants Class
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The Constants class provides easy access to defined constants that may be useful when participating in the discovery process
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The types defined in the specification of the Constants class are in the netjinidiscovery package The following additional types may also be referenced in this specification Whenever referenced, these object types will be referenced in unqualified form:
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The public constants defined by the Constants class are as follows:
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package netjinidiscovery; public class Constants { public static final short discoveryPort = 4160; public static final InetAddress getRequestAddress() throws UnknownHostException {} public static final InetAddress getAnnouncementAddress() throws UnknownHostException {} }
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The Constants class cannot be instantiated This class has one public variable and two public accessor methods; each is static and final The constant value associated with the variable, as well as the values returned by the methods, may be useful in the discovery process The value of the discoveryPort constant serves two purposes: The UDP port number over which the multicast request and announcement protocols operate The TCP port number over which the unicast discovery protocol operates by default
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition The getRequestAddress method returns an instance of InetAddress that contains the address of the multicast group over which the multicast request protocol takes place The getAnnouncementAddress method returns an instance of InetAddress that contains the address of the multicast group over which the multicast announcement protocol takes place Note that either getRequestAddress or getAnnouncementAddress may throw an UnknownHostException if called in a circumstance under which multicast address resolution is not permitted DU62 The OutgoingMulticastRequest Utility
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The OutgoingMulticastRequest class provides facilities for marshalling multicast discovery requests into a form suitable for transmission over a network for the purposes of announcing one's interest in discovering a lookup service This class is useful when building components that participate in the multicast request protocol as part of a group discovery mechanism This utility should be viewed from the perspective of an entity that wishes to transmit multicast requests in order to discover a lookup service belonging to a set of groups in which the entity is interested
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The types defined in the specification of the OutgoingMulticastRequest utility class are in the netjinidiscovery package The following additional types may also be referenced in this specification Whenever referenced, these object types will be referenced in unqualified form:
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The public methods provided by the OutgoingMulticastRequest class are as follows:
package netjinidiscovery; public class OutgoingMulticastRequest { public static DatagramPacket[] marshal(int port, String[] groups, ServiceID[] heard) throws IOException {} }
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The OutgoingMulticastRequest class cannot be instantiated This class has only one public method, which is static The marshal method takes as input the following arguments, none of which may be null: The port to which respondents should connect in order to start unicast discovery A String array, none of whose elements may be null, in which each element is the name of a group the requesting entity is interested in discovering An array of ServiceID objects, none of whose elements may be null, in which each element corresponds to a lookup service the requesting entity has already heard from DU6 Low Level Discovery Protocol Utilities 189
O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition Since implementations are not required to check for duplicated elements, the arguments represented as arrays must not contain such elements The marshal method returns an array whose elements are instances of DatagramPacket The array returned will always contain at least one element, and will contain more if the request is not small enough to fit in a single packet The array returned by this method is fully initialized; it contains a multicast request as payload and is ready to send over the network In the event of error, the marshal method may throw an IOException if marshalling fails In some instances the exception thrown may be a more specific sub class of that exception DU63 The IncomingMulticastRequest Utility