Package org.apache.river.discovery

Provides a set of constraints, low-level utility classes, and provider interfaces for participating in versions 1 and 2 of the multicast request, multicast announcement, and unicast discovery protocols.

See: Description

Interface Summary

Interface	Description
ClientSubjectChecker	Interface for approving or rejecting client subjects during unicast discovery and decoding of multicast requests.
DatagramBufferFactory	Factory that produces byte buffers, each corresponding to a separate datagram packet to be sent.
DelayedMulticastAnnouncementDecoder	Interface implemented by classes which decode multicast announcement data and additionally support delayed constraint checking.
DelayedMulticastRequestDecoder	Interface implemented by classes which decode multicast request data and additionally support delayed constraint checking.
DiscoveryFormatProvider	Interface implemented by all discovery format provider classes, which is used by the Discovery class to identify format providers available via resource, as described in the documentation for the Discovery.getProtocol2(ClassLoader) method.
EncodeIterator	Iterator for performing multicast encode operations on (potentially) multiple discovery format providers.
MulticastAnnouncementDecoder	Interface implemented by classes which decode multicast announcement data according to discovery protocol formats.
MulticastAnnouncementEncoder	Interface implemented by classes which encode multicast announcement data according to discovery protocol formats.
MulticastRequestDecoder	Interface implemented by classes which decode multicast request data according to discovery protocol formats.
MulticastRequestEncoder	Interface implemented by classes which encode multicast request data according to discovery protocol formats.
UnicastDiscoveryClient	Interface implemented by classes which perform the client (discovering) side of unicast discovery.
UnicastDiscoveryServer	Interface implemented by classes which handle the server (lookup service) side of unicast discovery.

Class Summary

Class	Description
ClientPermissionChecker	Implementation of ClientSubjectChecker that approves or rejects client subjects based on whether or not they have been granted a particular permission.
Discovery	Class providing methods for participating in versions 1 and 2 of the discovery protocol.
DiscoveryConstraints	Class for processing constraints which apply to the discovery protocol: DiscoveryProtocolVersion, MulticastMaxPacketSize, MulticastTimeToLive, UnicastSocketTimeout, ConnectionRelativeTime, ConnectionAbsoluteTime.
DiscoveryConstraintTrustVerifier	Trust verifier for instances of the constraint classes defined in the org.apache.river.discovery package.
DiscoveryProtocolVersion	Represents a constraint on the version of the discovery protocol used to contact lookup services.
MulticastAnnouncement	Class representing the values in a multicast announcement.
MulticastMaxPacketSize	Represents a constraint on the size (in bytes) of multicast packets used in the multicast request and multicast announcement discovery protocols.
MulticastRequest	Class representing the values in a multicast request.
MulticastTimeToLive	Represents a constraint on the time to live (TTL) value set on outgoing multicast request and multicast announcement packets.
UnicastResponse	Class representing the values obtained as the result of unicast discovery.
UnicastSocketTimeout	Represents a constraint on the timeout set on sockets used for unicast discovery.

Exception Summary

Exception	Description
DiscoveryProtocolException	Exception indicating a discovery protocol error, such as failure to interpret packet data, or multicast request/announcement data that cannot fit within a given packet length.

Package org.apache.river.discovery Description

Provides a set of constraints, low-level utility classes, and provider interfaces for participating in versions 1 and 2 of the multicast request, multicast announcement, and unicast discovery protocols.

The DiscoveryProtocolVersion, MulticastMaxPacketSize, MulticastTimeToLive and UnicastSocketTimeout classes represent constraints which can be applied to multicast and unicast discovery. The DiscoveryConstraints class offers convenience methods for querying the values expressed by groups of these constraints. The Discovery class provides methods implementing various low-level discovery protocol operations, such as encoding and decoding multicast packet contents and unicast discovery data. These methods accept as arguments instances of the MulticastRequest, MulticastAnnouncement and UnicastResponse classes, which represent the values (independent of protocol details) to be transmitted by multicast requests, multicast announcements, and unicast discovery.

The Discovery class implements both versions 1 and 2 of the discovery protocols. For version 2 of the protocols, it accepts pluggable format providers, specified via resource using the DiscoveryFormatProvider interface, which implement the MulticastRequestEncoder, MulticastRequestDecoder, MulticastAnnouncementEncoder, MulticastAnnouncementDecoder, UnicastDiscoveryClient, and UnicastDiscoveryServer format provider sub-interfaces.

See Also:

"Jini Discovery and Join Specification"