JGroups

JGroups is a toolkit for reliable group communication.

See:
Description

Packages

org.jgroups	Provides top-level public JGroups classes such as Channel, Message, etc.
org.jgroups.annotations
org.jgroups.auth
org.jgroups.blocks	Provides building blocks that are layered on top of channels.
org.jgroups.blocks.executor
org.jgroups.blocks.locking
org.jgroups.blocks.mux
org.jgroups.client
org.jgroups.conf	Provides ways to configure a protocol stack.
org.jgroups.debug	Provides debug support, including testing, profiling, and a graphical view of a protocol stack.
org.jgroups.demos	Provides demonstrations of JGroups functionality.
org.jgroups.demos.applets	Provides an applet that demonstrates JGroups functionality.
org.jgroups.demos.wb	A distributed whiteboard applet implemented using JGroups.
org.jgroups.jmx
org.jgroups.logging
org.jgroups.mux
org.jgroups.persistence	Provides features for storing information to a database or file.
org.jgroups.protocols	Provides implementations of transport protocols which are responsible for sending and receiving messages to/from the network.
org.jgroups.protocols.pbcast	Supports probabilistic broadcasts.
org.jgroups.stack	Support for managing protocol stacks.
org.jgroups.util	Provides useful functionality which cannot be assigned to any particular other package.

JGroups is a toolkit for reliable group communication. Processes can join a group, send messages to all members or single members, and receive messages from members in the group. The system keeps track of the members in every group, and notifies group members when a new member joins, or an existing member leaves or crashes. A group is identified by its name. Groups do not have to be created explicitly; when a process joins a non-existing group, that group will be created automatically. Member processes of a group can be located on the same host, within the same LAN, or across a WAN. A member can be part of multiple groups.