FiniteStateMachine (Net4j Utilities Documentation)

java.lang.Object
- org.eclipse.net4j.util.event.Notifier
- - org.eclipse.net4j.util.lifecycle.Lifecycle
  - - org.eclipse.net4j.util.fsm.FiniteStateMachine<STATE,EVENT,SUBJECT>

All Implemented Interfaces:

INotifier, ILifecycle, ILifecycle.DeferrableActivation

Direct Known Subclasses:

Negotiator
```
public abstract class FiniteStateMachine<STATE extends Enum<?>,EVENT extends Enum<?>,SUBJECT>
extends Lifecycle
```
A finite state machine that is based on a matrix of transitions.
A finite state machine can fire the following events:
- FiniteStateMachine.StateChangedEvent after state changes of a subject.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`class`	`FiniteStateMachine.ChangeStateTransition` A `transition` that changes the `state` of a subject.
`static class`	`FiniteStateMachine.FailTransition` Deprecated. Use `FAIL`
`static class`	`FiniteStateMachine.IgnoreTransition` Deprecated. Use `IGNORE`
`class`	`FiniteStateMachine.StateChangedEvent`

Nested classes/interfaces inherited from interface org.eclipse.net4j.util.lifecycle.ILifecycle
ILifecycle.DeferrableActivation

Field Summary

Fields
Modifier and Type Field and Description

static ITransition FAIL

static ITransition IGNORE
- Fields inherited from class org.eclipse.net4j.util.lifecycle.Lifecycle
  USE_LABEL

Fields
Modifier and Type	Field and Description
`static ITransition`	`FAIL`
`static ITransition`	`IGNORE`

Constructor Summary

Constructors
Constructor and Description
`FiniteStateMachine(Class<STATE> stateEnum, Class<EVENT> eventEnum)`
`FiniteStateMachine(Class<STATE> stateEnum, Class<EVENT> eventEnum, ITransition<STATE,EVENT,SUBJECT,?> defaultTransition)`

Method Summary

Methods
Modifier and Type	Method and Description
`protected STATE`	`changeState(SUBJECT subject, STATE state)`
`protected ITransition<STATE,EVENT,SUBJECT,?>`	`createFailTransition(STATE state, EVENT event)`
`protected ITransition<STATE,EVENT,SUBJECT,?>`	`createIgnoreTransition(STATE state, EVENT event)`
`protected String`	`formatFailMessage(SUBJECT subject, STATE state, EVENT event, Object data)`
`protected String`	`formatIgnoreMessage(SUBJECT subject, STATE state, EVENT event, Object data)`
`protected String`	`formatProcessMessage(SUBJECT subject, STATE state, EVENT event, Object data)`
`EVENT[]`	`getEvents()`
`protected abstract STATE`	`getState(SUBJECT subject)`
`STATE[]`	`getStates()`
`ITransition<STATE,EVENT,SUBJECT,?>`	`getTransition(STATE state, EVENT event)`
`void`	`init(STATE state, EVENT event, ITransition<STATE,EVENT,SUBJECT,?> transition)`
`void`	`init(STATE state, EVENT event, STATE targetState)`
`void`	`initAll(ITransition<STATE,EVENT,SUBJECT,?> transition)`
`void`	`initAll(STATE targetState)`
`void`	`initEvents(STATE state, ITransition<STATE,EVENT,SUBJECT,?> transition)`
`void`	`initEvents(STATE state, STATE targetState)`
`void`	`initStates(EVENT event, ITransition<STATE,EVENT,SUBJECT,?> transition)`
`void`	`initStates(EVENT event, STATE targetState)`
`<DATA> void`	`process(SUBJECT subject, EVENT event, DATA data)`
`protected abstract void`	`setState(SUBJECT subject, STATE state)`

Methods inherited from class org.eclipse.net4j.util.lifecycle.Lifecycle
activate, checkActive, checkArg, checkArg, checkInactive, checkNull, checkState, checkState, deactivate, deferredActivate, doActivate, doAfterActivate, doBeforeActivate, doBeforeDeactivate, doDeactivate, dump, getLifecycleState, isActive, isDeferredActivation, toString

Methods inherited from class org.eclipse.net4j.util.event.Notifier
addListener, fireEvent, fireEvent, fireEvent, fireThrowable, firstListenerAdded, getListeners, getNotificationService, hasListeners, lastListenerRemoved, removeListener

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.eclipse.net4j.util.event.INotifier
addListener, getListeners, hasListeners, removeListener

Field Detail

IGNORE
```
public static final ITransition IGNORE
```

FAIL
```
public static final ITransition FAIL
```

Constructor Detail

FiniteStateMachine

public FiniteStateMachine(Class<STATE> stateEnum,
                  Class<EVENT> eventEnum,
                  ITransition<STATE,EVENT,SUBJECT,?> defaultTransition)

FiniteStateMachine

public FiniteStateMachine(Class<STATE> stateEnum,
                  Class<EVENT> eventEnum)

Method Detail

getStates
```
public final STATE[] getStates()
```

getEvents
```
public final EVENT[] getEvents()
```

getTransition

public final ITransition<STATE,EVENT,SUBJECT,?> getTransition(STATE state,
                                               EVENT event)

init

public final void init(STATE state,
        EVENT event,
        STATE targetState)

init

public final void init(STATE state,
        EVENT event,
        ITransition<STATE,EVENT,SUBJECT,?> transition)

initEvents

public final void initEvents(STATE state,
              STATE targetState)

initEvents

public final void initEvents(STATE state,
              ITransition<STATE,EVENT,SUBJECT,?> transition)

initStates

public final void initStates(EVENT event,
              STATE targetState)

initStates

public final void initStates(EVENT event,
              ITransition<STATE,EVENT,SUBJECT,?> transition)

initAll

public final void initAll(STATE targetState)

initAll

public final void initAll(ITransition<STATE,EVENT,SUBJECT,?> transition)

process

public final <DATA> void process(SUBJECT subject,
                  EVENT event,
                  DATA data)

createIgnoreTransition

protected ITransition<STATE,EVENT,SUBJECT,?> createIgnoreTransition(STATE state,
                                                        EVENT event)

createFailTransition

protected ITransition<STATE,EVENT,SUBJECT,?> createFailTransition(STATE state,
                                                      EVENT event)

formatProcessMessage

protected String formatProcessMessage(SUBJECT subject,
                          STATE state,
                          EVENT event,
                          Object data)

formatIgnoreMessage

protected String formatIgnoreMessage(SUBJECT subject,
                         STATE state,
                         EVENT event,
                         Object data)

formatFailMessage

protected String formatFailMessage(SUBJECT subject,
                       STATE state,
                       EVENT event,
                       Object data)

getState

protected abstract STATE getState(SUBJECT subject)

setState

protected abstract void setState(SUBJECT subject,
            STATE state)

changeState

protected STATE changeState(SUBJECT subject,
                STATE state)

Since:: 3.0

Class FiniteStateMachine<STATE extends Enum<?>,EVENT extends Enum<?>,SUBJECT>

Nested Class Summary

Nested classes/interfaces inherited from interface org.eclipse.net4j.util.lifecycle.ILifecycle

Field Summary

Fields inherited from class org.eclipse.net4j.util.lifecycle.Lifecycle

Constructor Summary

Method Summary

Methods inherited from class org.eclipse.net4j.util.lifecycle.Lifecycle

Methods inherited from class org.eclipse.net4j.util.event.Notifier

Methods inherited from class java.lang.Object

Methods inherited from interface org.eclipse.net4j.util.event.INotifier

Field Detail

IGNORE

FAIL

Constructor Detail

FiniteStateMachine

FiniteStateMachine

Method Detail

getStates

getEvents

getTransition

init

init

initEvents

initEvents

initStates

initStates

initAll

initAll

process

createIgnoreTransition

createFailTransition

formatProcessMessage

formatIgnoreMessage

formatFailMessage

getState

setState

changeState