Package org.jgroups.util

Provides useful functionality which cannot be assigned to any particular other package.

See:
Description

Interface Summary

AgeOutCache.Handler<K>
Command	The Command patttern (see Gamma et al.).
FutureListener<T>	A listener that is called back when a future is done.
NotifyingFuture<T>	A sub-interface of a Future, that allows for listeners to be attached so that observers can be notified when the future completes.
ResourceManager.IpAddressRep
Streamable	Implementations of Streamable can add their state directly to the output stream, enabling them to bypass costly serialization
ThreadDecorator	An object that can alter the state of a thread when it receives a callback from a ThreadManager notifying it that the thread has been created or released from use.
ThreadFactory
ThreadManager	An object that manages threads and provides callbacks to a ThreadDecorator to allow it to alter their state.
TimeScheduler.Task	The interface that submitted tasks must implement

Class Summary

AckCollector	Collects acks from a number of nodes, waits for all acks.
AgeOutCache<K>	Cache which removes its elements after a certain time
BoundedList<T>	A bounded subclass of LinkedList, oldest elements are removed once max capacity is exceeded.
Buffer	Buffer with an offset and length.
DefaultThreadFactory	Thread factory mainly responsible for naming of threads.
Digest	A message digest, which is used by the PBCAST layer for gossiping (also used by NAKACK for keeping track of current seqnos for all members).
Digest.Entry	Class keeping track of the lowest and highest sequence numbers delivered, and the highest sequence numbers received, per member.
DirectExecutor
ExposedByteArrayInputStream
ExposedByteArrayOutputStream	Extends ByteArrayOutputStream, but exposes the internal buffer.
ExposedDataOutputStream
FIFOMessageQueue<K,V>	Deprecated. Will be removed together with the Multiplexer in 3.0
FixedSizeBitSet	Class copied from BitSet.
GetNetworkInterfaces	Lists all network interfaces on a system
Headers	Open addressing based implementation of a hashmap (not supporting the Map interface though) for message headers.
JUnitXMLReporter	Listener generating XML output suitable to be processed by JUnitReport.
LazyThreadFactory	Lazily names threads: whenever the address or cluster name is changed, all threads are renamed
MarshallerPool	Deprecated.
MergeId	ID to uniquely identify a merge
MessageTransferQueue	Concurrent queue containing messages.
Metronome
MutableDigest	A mutable version of Digest (which is immutable
MyConcurrentLinkedQueue<T>
MyReceiver	Simple receiver which buffers all messages
NullFuture<T>
Promise<T>	Allows a thread to submit an asynchronous request and to wait for the result.
PropertiesToXML	Iterates over all concrete Protocol classes and creates an XML file per Protocol class.
Proxy	Redirects incoming TCP connections to other hosts/ports.
Queue	Elements are added at the tail and removed from the head.
Range
ResourceManager	Manages resources such as multicast addresses and multicast ports, and TCP ports.
ResponseCollector<T>	Similar to AckCollector, but collects responses, not just acks.
Rsp<T>	class that represents a response from a communication
RspList	Contains responses from all members.
Seqno	Keeps track of a single message to retransmit
SeqnoComparator
SeqnoRange	Keeps track of a range of messages to be retransmitted.
SeqnoTable	Maintains the highest received and highest delivered seqno per member
ShutdownRejectedExecutionHandler	ShutdownRejectedExecutionHandler is a decorator RejectedExecutionHandler used in all JGroups ThreadPoolExecutor(s).
ThreadManagerThreadPoolExecutor	ThreadPoolExecutor subclass that implements @{link ThreadManager}.
TimeScheduler	Fixed-delay & fixed-rate single thread scheduler The scheduler supports varying scheduling intervals by asking the task every time for its next preferred scheduling interval.
Triple<V1,V2,V3>	Holds 3 values, useful when we have a map with a key, but more than 1 value and we don't want to create a separate holder object for the values, and don't want to pass the values as a list or array.
Tuple<V1,V2>	Holds 2 values, useful when we have a map with a key, but more than 1 value and we don't want to create a separate holder object for the values, and don't want to pass the values as a list or array.
UnmodifiableVector	Vector which cannot be modified
Util	Collection of various utility routines that can not be assigned to other classes.
UUID	Logical address which is unique over space and time.
XMLSchemaGenerator	Iterates over all concrete Protocol classes and creates XML schema used for validation of configuration files.

Enum Summary

StackType

Exception Summary

QueueClosedException

Package org.jgroups.util Description

Provides useful functionality which cannot be assigned to any particular other package.