org.apache.flink.streaming.examples.statemachine.dfa

枚举 State

java.lang.Object

java.lang.Enum<State>

org.apache.flink.streaming.examples.statemachine.dfa.State

所有已实现的接口:

Serializable, Comparable<State>

public enum State
extends Enum<State>

The State captures the main functionality of the state machine. It represents a specific state in the state machine, and holds all transitions possible from a specific state.

The state transition diagram is as follows:

           +--[a]--> W --[b]--> Y --[e]---+
           |                    ^         |
   Initial-+                    |         |
           |                    |         +--> (Z)-----[g]---> Terminal
           +--[c]--> X --[b]----+         |
                     |                    |
                     +--------[d]---------+
 

枚举常量概要

枚举常量

枚举常量和说明
Initial The initial state from which all state sequences start.
InvalidTransition Special state returned by the State.transition(...) function when attempting an illegal state transition.
Terminal The terminal state in the state machine.
W State 'W'.
X State 'X'.
Y State 'Y'.
Z State 'Z'.

方法概要

限定符和类型	方法和说明
boolean	isTerminal() Checks if this state is a terminal state.
EventType	randomInvalidTransition(Random rnd) Returns an event type that, if applied as a transition on this state, will result in an illegal state transition.
EventTypeAndState	randomTransition(Random rnd) Picks a random transition, based on the probabilities of the outgoing transitions of this state.
State	transition(EventType evt) Gets the state after transitioning from this state based on the given event.
static State	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static State[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

Terminal

public static final State Terminal

The terminal state in the state machine.

InvalidTransition

public static final State InvalidTransition

Special state returned by the State.transition(...) function when attempting an illegal state transition.

Z

public static final State Z

State 'Z'.

Y

public static final State Y

State 'Y'.

X

public static final State X

State 'X'.

W

public static final State W

State 'W'.

Initial

public static final State Initial

The initial state from which all state sequences start.

方法详细资料

values

public static State[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (State c : State.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static State valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值

isTerminal

public boolean isTerminal()

Checks if this state is a terminal state. A terminal state has no outgoing transitions.

transition

public State transition(EventType evt)

Gets the state after transitioning from this state based on the given event. If the transition is valid, this returns the new state, and if this transition is illegal, it returns [[InvalidTransition]].

参数:

evt - The event that defined the transition.

返回:

The new state, or [[InvalidTransition]].

randomTransition

public EventTypeAndState randomTransition(Random rnd)

Picks a random transition, based on the probabilities of the outgoing transitions of this state.

参数:

rnd - The random number generator to use.

返回:

A pair of (transition event , new state).

randomInvalidTransition

public EventType randomInvalidTransition(Random rnd)

Returns an event type that, if applied as a transition on this state, will result in an illegal state transition.

参数:

rnd - The random number generator to use.

返回:

And event type for an illegal state transition.