Package org.jgroups.util

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

See: Description

Interface Summary

Interface	Description
AgeOutCache.Handler<K>
Command	The Command patttern (see Gamma et al.).
SchedulerListener	Provides callback for use with a Scheduler.
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

Class	Description
AckCollector
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.
ContextObjectInputStream	ObjectInputStream which sets a contact classloader for reading bytes into objects.
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
ExposedBufferedInputStream
ExposedBufferedOutputStream
ExposedByteArrayInputStream
ExposedByteArrayOutputStream	Extends ByteArrayOutputStream, but exposes the internal buffer.
ExposedDataOutputStream
FIFOMessageQueue<K,V>	Blocking queue which can only process 1 message per service concurrently, establishing FIFO order per sender.
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.
LazyThreadFactory	Lazily names threads: whenever the address or cluster name is changed, all threads are renamed
MagicObjectInputStream	Uses magic numbers for class descriptors
MagicObjectOutputStream	Uses magic numbers for class descriptors
Marshaller	Title: JGroups Communications Description: Contact me at mail@filip.net Copyright: Copyright (c) 2002 Company: www.filip.net
MutableDigest	A mutable version of Digest (which is immutable
OutgoingBufferPool	Maintains a pool of ExposedDataOutputStreams.
PortsManager	Maintains a list of ports used on this host, associated with time stamps.
Promise<T>	Allows a thread to submit an asynchronous request and to wait for the result.
Proxy	Redirects incoming TCP connections to other hosts/ports.
Queue	Elements are added at the tail and removed from the head.
Range
ResponseCollector<T>	Similar to AckCollector, but collects responses, not just acks.
ReusableThread	Reusable thread class.
Rsp	class that represents a response from a communication
RspList	Contains responses from all members.
Scheduler	Implementation of a priority scheduler.
Scheduler.Task
SeqnoTable	Maintains the highest received and highest delivered seqno per member
ShutdownRejectedExecutionHandler	ShutdownRejectedExecutionHandler is a decorator RejectedExecutionHandler used in all JGroups ThreadPoolExecutor(s).
SizeBoundedQueue	Queue as described in http://jira.jboss.com/jira/browse/JGRP-376.
ThreadManagerThreadPoolExecutor	ThreadPoolExecutor subclass that implements @{link ThreadManager}.
ThreadPool	Maintains a set of ReusableThreads.
TimedWriter	Waits until the buffer has been written to the output stream, or until timeout msecs have elapsed, whichever comes first.
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.

Exception Summary

Exception	Description
QueueClosedException

Package org.jgroups.util Description

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