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target/
!.mvn/wrapper/maven-wrapper.jar
!**/src/main/**/target/
!**/src/test/**/target/
### IntelliJ IDEA ###
.idea/
### Eclipse ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
build/
!**/src/main/**/build/
!**/src/test/**/build/
### VS Code ###
.vscode/
### Mac OS ###
.DS_Store

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GNU GENERAL PUBLIC LICENSE
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How to Apply These Terms to Your New Programs
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<one line to give the program's name and a brief idea of what it does.>
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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This is free software, and you are welcome to redistribute it
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The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

1
README.md Normal file
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### StateManagement

39
pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.serliunx</groupId>
<artifactId>state-management</artifactId>
<version>1.0.0-alpha</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.13</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.36</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

28
src/main/java/com/serliunx/statemanagement/exception/StateException.java Normal file
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package com.serliunx.statemanagement.exception;
/**
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public class StateException extends RuntimeException {
public StateException() {
}
public StateException(String message) {
super(message);
}
public StateException(String message, Throwable cause) {
super(message, cause);
}
public StateException(Throwable cause) {
super(cause);
}
public StateException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
}
}

228
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package com.serliunx.statemanagement.machine;
import com.serliunx.statemanagement.machine.handler.StateHandler;
import com.serliunx.statemanagement.machine.handler.StateHandlerProcessParams;
import com.serliunx.statemanagement.machine.handler.StateHandlerWrapper;
import com.serliunx.statemanagement.manager.AbstractStateManager;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;
/**
* 状态机的标准实现
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public class StandardStateMachine<S> extends AbstractStateManager<S> implements StateMachine<S> {
/**
* 进入事件集合
*/
private final Map<S, List<StateHandlerWrapper<S>>> entryHandlers;
/**
* 离开事件集合
*/
private final Map<S, List<StateHandlerWrapper<S>>> leaveHandlers;
/**
* 交换事件集合
*/
private final Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers;
/**
* 异步执行器
*/
private final Executor executor;
/**
* 是否异步执行
* <p>
* 当具体的执行器没有指定是否异步时, 将根据该值决定是否异步执行.
*/
private final Boolean async;
/**
* 默认的构造函数
*
* @param entryHandlers 进入事件处理器集合
* @param leaveHandlers 离开事件处理器集合
* @param exchangeHandlers 交换事件处理器集合
* @param executor 异步执行器
* @param async 是否异步执行
*/
StandardStateMachine(List<S> stateList,
Map<S, List<StateHandlerWrapper<S>>> entryHandlers,
Map<S, List<StateHandlerWrapper<S>>> leaveHandlers,
Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers,
Executor executor,
Boolean async
) {
super(stateList);
this.entryHandlers = entryHandlers;
this.leaveHandlers = leaveHandlers;
this.exchangeHandlers = exchangeHandlers;
this.executor = executor;
this.async = async;
}
@Override
public S switchPrevAndGet() {
try {
writeLock.lock();
S oldState = get();
prev();
S newState = get();
invokeHandlers(oldState, newState);
return newState;
} finally {
writeLock.unlock();
}
}
@Override
public S getAndSwitchPrev() {
try {
writeLock.lock();
S oldState = get();
prev();
S newState = get();
invokeHandlers(oldState, newState);
return oldState;
} finally {
writeLock.unlock();
}
}
@Override
public void switchPrev() {
try {
writeLock.lock();
S oldState = get();
prev();
S newState = get();
invokeHandlers(oldState, newState);
} finally {
writeLock.unlock();
}
}
@Override
public S switchNextAndGet() {
try {
writeLock.lock();
S oldState = get();
next();
S newState = get();
invokeHandlers(oldState, newState);
return newState;
} finally {
writeLock.unlock();
}
}
@Override
public S getAndSwitchNext() {
try {
writeLock.lock();
S oldState = get();
next();
S newState = get();
invokeHandlers(oldState, newState);
return oldState;
} finally {
writeLock.unlock();
}
}
@Override
public void switchNext() {
try {
writeLock.lock();
S oldState = get();
next();
S newState = get();
invokeHandlers(oldState, newState);
} finally {
writeLock.unlock();
}
}
@Override
public boolean switchTo(S state) {
try {
writeLock.lock();
S oldState = get();
boolean result = super.switchTo(state);
if (result) {
S newState = get();
invokeHandlers(oldState, newState);
}
return result;
} finally {
writeLock.unlock();
}
}
@Override
public void reset() {
try {
writeLock.lock();
S oldState = get();
super.reset();
S newState = get();
invokeHandlers(oldState, newState);
} finally {
writeLock.unlock();
}
}
/**
* 触发处理器
*
* @param from 源状态
* @param to 目的状态
*/
private void invokeHandlers(S from, S to) {
// 触发离开处理器
doInvokeHandlers(leaveHandlers.get(from), from, to);
// 触发进入处理器
doInvokeHandlers(entryHandlers.get(to), from, to);
// 触发交换处理器
final String key = from.toString() + "-" + to.toString();
doInvokeHandlers(exchangeHandlers.get(key), from, to);
}
/**
* 触发
*/
private void doInvokeHandlers(List<StateHandlerWrapper<S>> handlerWrappers, S from, S to) {
if (handlerWrappers == null) {
return;
}
// 全局的异步状态
final boolean isGlobalAsync = async != null && async;
handlerWrappers.forEach(hw -> {
final StateHandler<S> stateHandler;
if (hw == null ||
(stateHandler = hw.getStateHandler()) == null) {
return;
}
final Executor executorToRun = hw.getExecutor() == null ? executor : hw.getExecutor();
final boolean runInAsync = hw.getAsync() == null ? isGlobalAsync : hw.getAsync();
final StateHandlerProcessParams<S> params = new StateHandlerProcessParams<>(from, to, null);
if (runInAsync) {
if (executorToRun == null) {
throw new NullPointerException();
}
executorToRun.execute(() -> stateHandler.handle(params));
} else {
stateHandler.handle(params);
}
});
}
}

26
src/main/java/com/serliunx/statemanagement/machine/StateMachine.java Normal file
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package com.serliunx.statemanagement.machine;
import com.serliunx.statemanagement.manager.BidirectionalStateManager;
/**
* 状态机定义
* <p>
* 基于双向的状态管理器扩展 {@link BidirectionalStateManager}, 切换逻辑依赖于内置的状态管理器；
* 同时可以多种监听事件, 包括:
* <li> 切换至指定状态时触发 (进入事件)
* <li> 切出指定状态时触发 (离开事件)
* <li> 从A切换到B状态时触发 (交换事件)
* <p>
* 推荐使用{@link StateMachineBuilder} 来构建状态机.
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
* @see StateMachineBuilder
* @see BidirectionalStateManager
* @see com.serliunx.statemanagement.manager.StateManager
*/
public interface StateMachine<S> extends BidirectionalStateManager<S> {
}

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package com.serliunx.statemanagement.machine;
import com.serliunx.statemanagement.machine.handler.StateHandler;
import com.serliunx.statemanagement.machine.handler.StateHandlerWrapper;
import com.serliunx.statemanagement.manager.BidirectionalStateManager;
import java.util.*;
import java.util.concurrent.Executor;
/**
* 状态机构建
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public final class StateMachineBuilder<S> {
/**
* 状态管理器
*/
private List<S> stateList;
/**
* 执行器
*/
private Executor executor;
/**
* 是否异步执行
*/
private Boolean async;
/**
* 各种事件
*/
private final Map<S, List<StateHandlerWrapper<S>>> entryHandlers = new HashMap<>(64);
private final Map<S, List<StateHandlerWrapper<S>>> leaveHandlers = new HashMap<>(64);
private final Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers = new HashMap<>(64);
// private-ctor
private StateMachineBuilder() {}
/**
* 添加交换事件
* <li> 从A状态切换至B状态时触发
*
* @param from 源状态
* @param to 目的状态
* @param handler 处理器
* @param async 是否异步执行
* @param executor 异步执行器, 异步执行时将使用, 不指定时将使用状态机内置的执行器
*/
public StateMachineBuilder<S> exchange(S from, S to, StateHandler<S> handler, Boolean async, Executor executor) {
final String key = from.toString() + "-" + to.toString();
final List<StateHandlerWrapper<S>> stateHandlerWrappers = exchangeHandlers.computeIfAbsent(key,
k -> new ArrayList<>());
stateHandlerWrappers.add(new StateHandlerWrapper<>(handler, executor, async));
return this;
}
/**
* 添加交换事件
* <li> 从A状态切换至B状态时触发
*
* @param from 源状态
* @param to 目的状态
* @param handler 处理器
* @param async 是否异步执行
*/
public StateMachineBuilder<S> exchange(S from, S to, StateHandler<S> handler, Boolean async) {
return exchange(from, to, handler, async, null);
}
/**
* 添加交换事件
* <li> 从A状态切换至B状态时触发
*
* @param from 源状态
* @param to 目的状态
* @param handler 处理器
*/
public StateMachineBuilder<S> exchange(S from, S to, StateHandler<S> handler) {
return exchange(from, to, handler, null);
}
/**
* 添加离开事件
* <li> 从指定状态切换到别的状态时执行的逻辑
*
* @param state 状态
* @param handler 处理逻辑
* @param async 是否异步执行
* @param executor 异步执行器, 异步执行时将使用, 不指定时将使用状态机内置的执行器
*/
public StateMachineBuilder<S> whenLeave(S state, StateHandler<S> handler, Boolean async, Executor executor) {
final List<StateHandlerWrapper<S>> stateHandlerWrappers = leaveHandlers.computeIfAbsent(state,
k -> new ArrayList<>());
stateHandlerWrappers.add(new StateHandlerWrapper<>(handler, executor, async));
return this;
}
/**
* 添加离开事件
* <li> 从指定状态切换到别的状态时执行的逻辑
*
* @param state 状态
* @param handler 处理逻辑
* @param async 是否异步执行
*/
public StateMachineBuilder<S> whenLeave(S state, StateHandler<S> handler, Boolean async) {
return whenLeave(state, handler, async, null);
}
/**
* 添加离开事件
* <li> 从指定状态切换到别的状态时执行的逻辑
*
* @param state 状态
* @param handler 处理逻辑
*/
public StateMachineBuilder<S> whenLeave(S state, StateHandler<S> handler) {
return whenLeave(state, handler, null);
}
/**
* 添加进入事件
* <li> 切换到了指定状态时执行的逻辑
*
* @param state 状态
* @param handler 处理逻辑
* @param async 是否异步执行
* @param executor 异步执行器, 异步执行时将使用, 不指定时将使用状态机内置的执行器
*/
public StateMachineBuilder<S> whenEntry(S state, StateHandler<S> handler, Boolean async, Executor executor) {
final List<StateHandlerWrapper<S>> stateHandlerWrappers = entryHandlers.computeIfAbsent(state,
k -> new ArrayList<>());
stateHandlerWrappers.add(new StateHandlerWrapper<>(handler, executor, async));
return this;
}
/**
* 添加进入事件
* <li> 切换到了指定状态时执行的逻辑
*
* @param state 状态
* @param handler 处理逻辑
* @param async 是否异步执行
*/
public StateMachineBuilder<S> whenEntry(S state, StateHandler<S> handler, Boolean async) {
return whenEntry(state, handler, async, null);
}
/**
* 添加进入事件
* <li> 切换到了指定状态时执行的逻辑
*
* @param state 状态
* @param handler 处理逻辑
*/
public StateMachineBuilder<S> whenEntry(S state, StateHandler<S> handler) {
return whenEntry(state, handler, null);
}
/**
* 指定状态机的执行器
* <p>
* 优先级低于添加事件时指定的执行器
*
* @param executor 执行器
*/
public StateMachineBuilder<S> executor(Executor executor) {
this.executor = executor;
return this;
}
/**
* 定义状态机是否异步执行
*
* @param async 是否异步执行
*/
public StateMachineBuilder<S> async(Boolean async) {
this.async = async;
return this;
}
/**
* 定义状态机为异步执行
*/
public StateMachineBuilder<S> async() {
return async(true);
}
/**
* 设置状态列表
*/
public StateMachineBuilder<S> states(S[] states) {
return states(Arrays.asList(states));
}
/**
* 设置状态列表
*/
public StateMachineBuilder<S> states(List<S> states) {
stateList = states;
return this;
}
/**
* 构建
*/
@SuppressWarnings("unchecked")
public <M extends StateMachine<S>> M build() {
return (M) new StandardStateMachine<>(stateList, entryHandlers,
leaveHandlers, exchangeHandlers, executor, async);
}
/**
* 状态机构建器
*
* @param stateClass 状态类
* @return 状态机构建器实例
* @param <S> 状态类参数
*/
@SuppressWarnings("all")
public static <S> StateMachineBuilder<S> from(Class<? extends S> stateClass) {
return new StateMachineBuilder<>();
}
}

21
src/main/java/com/serliunx/statemanagement/machine/handler/StateHandler.java Normal file
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package com.serliunx.statemanagement.machine.handler;
/**
* 状态处理器
* <p>
* 定义状态进入、离开及切换时执行的逻辑
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
@FunctionalInterface
public interface StateHandler<S> {
/**
* 处理
*
* @param params 参数
*/
void handle(StateHandlerProcessParams<S> params);
}

53
src/main/java/com/serliunx/statemanagement/machine/handler/StateHandlerProcessParams.java Normal file
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package com.serliunx.statemanagement.machine.handler;
import com.serliunx.statemanagement.manager.BidirectionalStateManager;
/**
* 状态处理器入参
* <p>
* 用于状态机处理事件
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
@SuppressWarnings("all")
public final class StateHandlerProcessParams<S> {
/**
* 源状态
*/
private final S from;
/**
* 目标状态
*/
private final S to;
/**
* 附加参数
*/
private final Object attach;
/**
* @param from 原状态
* @param to 目标状态
* @param attach 附加参数
* @param bidirectionalStateManager 状态机内置的状态管理器
*/
public StateHandlerProcessParams(S from, S to, Object attach) {
this.from = from;
this.to = to;
this.attach = attach;
}
public S getFrom() {
return from;
}
public S getTo() {
return to;
}
public Object getAttach() {
return attach;
}
}

10
src/main/java/com/serliunx/statemanagement/machine/handler/StateHandlerRegistry.java Normal file
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package com.serliunx.statemanagement.machine.handler;
/**
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public class StateHandlerRegistry {
}

53
src/main/java/com/serliunx/statemanagement/machine/handler/StateHandlerWrapper.java Normal file
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package com.serliunx.statemanagement.machine.handler;
import java.util.concurrent.Executor;
/**
* 处理器封装
* <p>
* 用于添加处理器时设置处理器的行为
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
@SuppressWarnings("all")
public final class StateHandlerWrapper<S> {
/**
* 状态处理器
*/
private final StateHandler<S> stateHandler;
/**
* 执行器
* <li> 用于异步执行处理逻辑
*/
private final Executor executor;
/**
* 是否异步执行
*/
private final Boolean async;
/**
* @param stateHandler 状态处理器
* @param executor 执行器
* @param async 是否异步执行
*/
public StateHandlerWrapper(StateHandler<S> stateHandler, Executor executor, Boolean async) {
this.stateHandler = stateHandler;
this.executor = executor;
this.async = async;
}
public StateHandler<S> getStateHandler() {
return stateHandler;
}
public Executor getExecutor() {
return executor;
}
public Boolean getAsync() {
return async;
}
}

184
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package com.serliunx.statemanagement.manager;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* 状态管理器的抽象实现
* <p>
* 提供了最基本功能的实现以及部分供子类使用的参数，如：锁、当前状态的序号等.
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public abstract class AbstractStateManager<S> implements StateManager<S> {
/**
* 状态列表
*/
private final List<S> stateList;
/**
* 当前状态的序号
* <p> 请保证仅在有写锁的情况下去修改
*/
private volatile int index;
/**
* 锁
*/
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
/**
* 读锁
*/
protected final ReentrantReadWriteLock.ReadLock readLock = lock.readLock();
/**
* 写锁
*/
protected final ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
/**
* @param stateList 状态列表
*/
public AbstractStateManager(List<S> stateList) {
this.stateList = stateList;
index = 0;
}
/**
* @param states 状态数组
*/
public AbstractStateManager(S[] states) {
this(Arrays.asList(states));
}
/**
* 保留空构造器
*/
public AbstractStateManager() {
this((List<S>) null);
}
@Override
public S current() {
try {
readLock.lock();
return get();
} finally {
readLock.unlock();
}
}
@Override
public boolean switchTo(S state) {
int i = indexOf(state);
if (i == -1) {
return false;
}
try {
writeLock.lock();
index = i;
} finally {
writeLock.unlock();
}
return true;
}
@Override
public void reset() {
try {
writeLock.lock();
index = getDefault();
} finally {
writeLock.unlock();
}
}
/**
* 将序号移动至下一个
* <li> 自动归零
* <li> 仅在持有写锁的情况下访问
*/
@SuppressWarnings("all")
protected void next() {
if (++index >= stateList.size())
index = 0;
}
/**
* 将序号移动至上一个
* <li> 自动归零
* <li> 仅在持有写锁的情况下访问
*/
@SuppressWarnings("all")
protected void prev() {
if (--index < 0)
index = 0;
}
/**
* 获取当前状态
* <p>
* 类及子类访问当前状态时不允许使用{@link #current()}，因为会造成死锁
*
* <li> 仅在持有锁的情况下访问
*
* @return 当前状态
*/
protected S get() {
return stateList.get(index);
}
/**
* 获取指定状态在状态列表中的序号
*
* @param state 状态
* @return 序号 {@link List#indexOf(Object)}
*/
protected int indexOf(S state) {
return stateList.indexOf(state);
}
/**
* 判断当前状态是否为状态列表中的最后一个
*
* @return 是最后一个时返回真, 否则返回假.
*/
protected boolean isLast() {
return index == stateList.size() - 1;
}
/**
* 判断当前状态是否为状态列表中的第一个
*
* @return 是第一个时返回真, 否则返回假.
*/
protected boolean isFirst() {
return index == getDefault();
}
/**
* 获取当前状态的序号
*
* @return 当前状态序号
*/
protected int currentIndex() {
return index;
}
/**
* 更新当前状态的序号
*/
protected void updateCurrentIndex(int newIndex) {
index = newIndex;
}
/**
* 状态序号默认值(等同于默认状态)
*/
protected int getDefault() {
return 0;
}
}

32
src/main/java/com/serliunx/statemanagement/manager/BidirectionalStateManager.java Normal file
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package com.serliunx.statemanagement.manager;
/**
* 双向流转的状态管理器
* <p>
* 基于单向流转的状态管理器{@link UnidirectionalStateManager} 实现, 在其基础上允许了反方向切换状态
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public interface BidirectionalStateManager<S> extends UnidirectionalStateManager<S> {
/**
* 切换至上一个状态并返回切换后的状态
*
* @return 切换后的状态
*/
S switchPrevAndGet();
/**
* 获取当前状态并切换至上一个状态
*
* @return 切换前的状态
*/
S getAndSwitchPrev();
/**
* 切换至上一个状态
*/
void switchPrev();
}

66
src/main/java/com/serliunx/statemanagement/manager/DefaultBidirectionalStateManager.java Normal file
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package com.serliunx.statemanagement.manager;
import java.util.List;
/**
* 双向流转的状态管理器的默认实现
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public class DefaultBidirectionalStateManager<S> extends DefaultUnidirectionalStateManager<S>
implements BidirectionalStateManager<S> {
/**
* @param stateList 状态列表
*/
public DefaultBidirectionalStateManager(List<S> stateList) {
super(stateList);
}
/**
* @param states 状态数组
*/
public DefaultBidirectionalStateManager(S[] states) {
super(states);
}
@Override
public S switchPrevAndGet() {
try {
writeLock.lock();
prev();
return get();
} finally {
writeLock.unlock();
}
}
@Override
public S getAndSwitchPrev() {
try {
writeLock.lock();
S current = get();
prev();
return current;
} finally {
writeLock.unlock();
}
}
@Override
public void switchPrev() {
try {
writeLock.lock();
prev();
} finally {
writeLock.unlock();
}
}
@Override
public boolean switchTo(S state) {
return defaultSwitchTo(state);
}
}

85
src/main/java/com/serliunx/statemanagement/manager/DefaultUnidirectionalStateManager.java Normal file
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package com.serliunx.statemanagement.manager;
import java.util.List;
/**
* 单向流转的状态管理器的默认实现
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public class DefaultUnidirectionalStateManager<S> extends AbstractStateManager<S>
implements UnidirectionalStateManager<S> {
/**
* @param stateList 状态列表
*/
public DefaultUnidirectionalStateManager(List<S> stateList) {
super(stateList);
}
/**
* @param states 状态数组
*/
public DefaultUnidirectionalStateManager(S[] states) {
super(states);
}
@Override
public S switchNextAndGet() {
try {
writeLock.lock();
next();
return get();
} finally {
writeLock.unlock();
}
}
@Override
public S getAndSwitchNext() {
try {
writeLock.lock();
S current = get();
next();
return current;
} finally {
writeLock.unlock();
}
}
@Override
public void switchNext() {
try {
writeLock.lock();
next();
} finally {
writeLock.unlock();
}
}
@Override
public boolean switchTo(S state) {
try {
writeLock.lock();
final int i;
if ((i = indexOf(state)) == -1 ||
(!isLast() && i < currentIndex()) ||
(isLast() && i != getDefault())) {
return false;
}
updateCurrentIndex(i);
} finally {
writeLock.unlock();
}
return true;
}
/**
* 保留默认的切换方式供子类使用
*/
protected boolean defaultSwitchTo(S state) {
return super.switchTo(state);
}
}

27
src/main/java/com/serliunx/statemanagement/manager/StandardStateManager.java Normal file
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package com.serliunx.statemanagement.manager;
import java.util.List;
/**
* 最简单的状态管理器实现
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public final class StandardStateManager<S> extends AbstractStateManager<S> {
/**
* @param stateList 状态列表
*/
public StandardStateManager(List<S> stateList) {
super(stateList);
}
/**
* @param states 状态数组
*/
public StandardStateManager(S[] states) {
super(states);
}
}

35
src/main/java/com/serliunx/statemanagement/manager/StateManager.java Normal file
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package com.serliunx.statemanagement.manager;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* 状态管理器
* <p>
* 将状态集合按照一定的逻辑流转
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public interface StateManager<S> {
/**
* 获取当前状态
*
* @return 当前最新状态
*/
S current();
/**
* 切换到指定状态
*
* @param state 新的状态
* @return 切换成功返回真, 否则返回假
*/
boolean switchTo(S state);
/**
* 重置回默认状态, 一般为状态集合中的第一个
*/
void reset();
}

40
src/main/java/com/serliunx/statemanagement/manager/UnidirectionalStateManager.java Normal file
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package com.serliunx.statemanagement.manager;
/**
* 单向流转的状态管理器
* <p>
* 其基本逻辑等同于 {@link StateManager}, 但存在以下不同:
* <li> 状态只能单方向流动(最后一个状态允许切换至第一个状态), 如果有A, B, C, D 四种状态则存在以下几种情况:
* <p>
* <p>
* <li> A -> B 允许直接切换, A -> C 允许直接切换, C -> D 允许直接切换 等等..
* <li> B -> A 不允许切换, C -> A 不允许切换, D -> C 不允许切换 等等..
* <li> 特例: D -> A 是允许的, 因为D是最后一个状态, 故可以切换至第一个状态.
* <p>
* 即状态的切换只允许一个方向，不允许向前流动，除非到达最后一个状态!
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public interface UnidirectionalStateManager<S> extends StateManager<S> {
/**
* 切换至下一个状态并返回切换后的状态
*
* @return 切换后的状态
*/
S switchNextAndGet();
/**
* 返回并切换至下一个状态
*
* @return 切换前的状态
*/
S getAndSwitchNext();
/**
* 切换至下一个状态
*/
void switchNext();
}

11
src/main/java/com/serliunx/statemanagement/support/ExecutorUtils.java Normal file
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package com.serliunx.statemanagement.support;
/**
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public final class ExecutorUtils {
private ExecutorUtils() {throw new UnsupportedOperationException();}
}

41
src/test/java/com/serliunx/statemanagement/MachineTest.java Normal file
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package com.serliunx.statemanagement;
import com.serliunx.statemanagement.machine.StateMachine;
import com.serliunx.statemanagement.machine.StateMachineBuilder;
import com.serliunx.statemanagement.support.PrinterState;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import java.util.concurrent.Executors;
/**
* 状态机测试
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
@Slf4j
public class MachineTest {
@Test
public void testStandardStateMachine() {
StateMachine<PrinterState> stateMachine = StateMachineBuilder.from(PrinterState.class)
.async(false)
.whenLeave(PrinterState.PRINTING, h -> {
System.out.println(Thread.currentThread().getName() + ": leave PRINTING");
})
.states(PrinterState.values())
.executor(Executors.newFixedThreadPool(16))
.whenEntry(PrinterState.SCANNING, h -> {
System.out.println(Thread.currentThread().getName() + ": " + h.getFrom() + " >>> " + h.getTo());
}, false)
.whenEntry(PrinterState.PRINTING, h -> {
System.out.println(Thread.currentThread().getName() + ": " + h.getFrom() + " >>> " + h.getTo());
}, false, Executors.newFixedThreadPool(1))
.exchange(PrinterState.STOPPED, PrinterState.IDLE, h -> {
System.out.println(Thread.currentThread().getName() + ": " + h.getFrom() + " >>> " + h.getTo());
})
.build();
}
}

20
src/test/java/com/serliunx/statemanagement/ManagerTest.java Normal file
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package com.serliunx.statemanagement;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
/**
* 状态管理器测试
*
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
@Slf4j
public class ManagerTest {
@Test
public void testUnidirectionalStateManager() {
}
}

14
src/test/java/com/serliunx/statemanagement/support/PrinterState.java Normal file
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package com.serliunx.statemanagement.support;
/**
* @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
* @version 1.0.0
* @since 2024/12/28
*/
public enum PrinterState {
IDLE,
SCANNING,
PRINTING,
STOPPING,
STOPPED
}