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
SocketFactory	Factory to create various types of sockets.
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	Timer-like interface which allows for execution of tasks.
TimeScheduler.Task	The interface that dynamic tasks (TimeScheduler.scheduleWithDynamicInterval(org.jgroups.util.TimeScheduler.Task)) must implement

Class Summary

AckCollector	Collects acks from a number of nodes, waits for all acks.
AdditionalDataUUID	Subclass of UUID which adds a string as payload.
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.
ConcurrentLinkedBlockingQueue<T>	Attempt at writing a fast transfer queue, which is bounded.
CreditMap	Maintains credits for senders, when credits fall below 0, a sender blocks until new credits have been received.
DefaultSocketFactory	Default implementation, ignores service names
DefaultThreadFactory	Thread factory mainly responsible for naming of threads.
DefaultTimeScheduler	Implementation of TimeScheduler by extending ScheduledThreadPoolExecutor to keep tasks sorted.
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
HashedTimingWheel	Implementation of TimeScheduler.
HashedTimingWheel.MyTask	Simple task wrapper, always executed by at most 1 thread.
Headers	Open addressing based implementation of a hashmap (not supporting the Map interface though) for message headers.
ImmutableReference<T>	Simple class that holds an immutable reference to another object (or to null).
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
Metronome
MutableDigest	A mutable version of Digest (which is immutable
MyReceiver	Simple receiver which buffers all messages
NullFuture<T>
PayloadUUID	Subclass of UUID which adds a string as payload.
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 tables with Protocol's properties.
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.
RetransmitTable	A store for messages to be retransmitted or delivered.
RingBuffer<T>
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).
SingletonAddress	Address with a cluster name.
ThreadManagerThreadPoolExecutor	ThreadPoolExecutor subclass that implements @{link ThreadManager}.
TimeScheduler2	Implementation of TimeScheduler.
TimeScheduler2.MyTask	Simple task wrapper, always executed by at most 1 thread.
TopologyUUID	Subclass of UUID which adds 3 strings (siteId, rackId and machineId)as payload.
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
Util.AddressScope

Exception Summary

QueueClosedException

Package org.jgroups.util Description

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