org.opennms.core.fiber

Interface Fiber

All Known Subinterfaces:

InitializableFiber, MockServiceDaemonMBean, NotifdQueueHandler, PausableFiber, ServiceDaemon, ServiceDaemonMBean

All Known Implementing Classes:

AbstractServiceDaemon, Actiond, Alarmd, AsteriskGateway, Collectd, Correlator, DataSender, DefaultQueueHandler, Discovery, EnhancedLinkd, Eventd, EventTranslator, EventTranslator, JettyServer, LegacyScheduler, MockServiceDaemon, Notifd, PassiveStatusd, PassiveStatusKeeper, Poller, Queued, RTCManager, Scriptd, SnmpPoller, Syslogd, Tl1d, Trapd, Vacuumd

public interface Fiber

The Fiber interface is similar to the core Java language Threadclass. The Fiber class is used to define a working context, which is the basic feature of a Thread. The differences end there since the Thread class is part of the core language and can only be extended since it is a concrete class.

The Fiber concept is used to represent an implementation defined execution context outside of the core Java language. It provides a very loose definition of what and how a Fiber should behave. This gives a great deal of implementation independence to the implementing classes.

For example, the Fiber interface could be used to represent a one-to-one mapping of a Java Thread. It could be used to represent a thread pool where multiple threads are grouped as one Fiber unit. Additionally, it could be used to defined a new execution environment where multiple Runnable elements are multiplexed over a one or more threads, where the Runnables far exceed the core Java threads.

Author:

Brian Weaver

Field Summary

Fields

Modifier and Type	Field and Description
static int	RUNNING This state is used to define the normal runtime condition of a Fiber.
static int	START_PENDING This is the initial Fiber state.
static int	STARTING This state is used to define when a Fiber has begun the Initialization process.
static String[]	STATUS_NAMES The string names that correspond to the states of the fiber.
static int	STOP_PENDING This state is used to denote when the Fiber is terminating processing.
static int	STOPPED This state represents the final resting state of a Fiber.

Method Summary

Modifier and Type	Method and Description
String	getName() This method is used to return the name of the Fiber.
int	getStatus() This method is used to get the current status of the Fiber.
void	start() This method is used to start the initialization process of the Fiber, which should eventually transition to a RUNNING status.
void	stop() This method is used to stop a currently running Fiber.

Field Detail

STATUS_NAMES

static final String[] STATUS_NAMES

The string names that correspond to the states of the fiber.

START_PENDING

static final int START_PENDING

This is the initial Fiber state. When the Fiber begins it startup process it will transition to the STARTING state. A Fiber in a start pending state has not begun any of the initialization process.

See Also:

Constant Field Values

STARTING

static final int STARTING

This state is used to define when a Fiber has begun the Initialization process. Once the initialization process is completed the Fiber will transition to a RUNNING status.

See Also:

Constant Field Values

RUNNING

static final int RUNNING

This state is used to define the normal runtime condition of a Fiber. When a Fiber is in this state then it is processing normally.

See Also:

Constant Field Values

STOP_PENDING

static final int STOP_PENDING

This state is used to denote when the Fiber is terminating processing. This state is always followed by the state ST0PPED.

See Also:

Constant Field Values

STOPPED

static final int STOPPED

This state represents the final resting state of a Fiber. Depending on the implementation it may be possible to resurrect the Fiber from this state.

See Also:

Constant Field Values

Method Detail

start

void start()

This method is used to start the initialization process of the Fiber, which should eventually transition to a RUNNING status.

stop

void stop()

This method is used to stop a currently running Fiber. Once invoked the Fiber should begin it's shutdown process. Depending on the implementation, this method may block until the Fiber terminates.

getName

String getName()

This method is used to return the name of the Fiber. The name of the instance is defined by the implementor, but it should be realitively unique when possible.

Returns:

The name of the Fiber.

getStatus

int getStatus()

This method is used to get the current status of the Fiber. The status of the fiber should be one of the predefined constants of the Fiber interface, or from one of the derived interfaces.

Returns:

The current status of the Fiber.