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* State Machine - 状态机实现
*
* 设计模式：状态机模式
* 来源：DeerFlow 架构学习
*/
/**
* 编排任务状态枚举
*/
const OrchestrationState = {
PENDING: 'pending',
RUNNING: 'running',
PAUSED: 'paused',
COMPLETED: 'completed',
FAILED: 'failed',
CANCELLED: 'cancelled'
};
/**
* 状态转换规则
*/
const STATE_TRANSITIONS = {
[OrchestrationState.PENDING]: [OrchestrationState.RUNNING, OrchestrationState.CANCELLED],
[OrchestrationState.RUNNING]: [OrchestrationState.COMPLETED, OrchestrationState.FAILED, OrchestrationState.PAUSED],
[OrchestrationState.PAUSED]: [OrchestrationState.RUNNING, OrchestrationState.CANCELLED],
[OrchestrationState.COMPLETED]: [], // 终态
[OrchestrationState.FAILED]: [OrchestrationState.RUNNING], // 允许重试
[OrchestrationState.CANCELLED]: [] // 终态
};
/**
* 状态机类
*/
class StateMachine {
constructor(initialState = OrchestrationState.PENDING, options = {}) {
this.state = initialState;
this.history = [{ state: initialState, timestamp: Date.now() }];
this.metadata = options.metadata || {};
this.listeners = [];
}
/**
* 获取当前状态
*/
getState() {
return this.state;
}
/**
* 检查是否可以转换到目标状态
*/
canTransitionTo(targetState) {
const allowedTransitions = STATE_TRANSITIONS[this.state] || [];
return allowedTransitions.includes(targetState);
}
/**
* 状态转换
*/
async transition(targetState, context = {}) {
if (!this.canTransitionTo(targetState)) {
throw new Error(
`Invalid state transition: ${this.state} → ${targetState}. ` +
`Allowed transitions: ${STATE_TRANSITIONS[this.state]?.join(', ') || 'none'}`
);
}
const previousState = this.state;
this.state = targetState;
const historyEntry = {
state: targetState,
previousState,
timestamp: Date.now(),
context
};
this.history.push(historyEntry);
// 通知监听器
await this._notifyListeners(targetState, previousState, context);
return {
previousState,
newState: targetState,
timestamp: historyEntry.timestamp
};
}
/**
* 注册状态变化监听器
*/
onStateChange(listener) {
this.listeners.push(listener);
}
/**
* 通知监听器
*/
async _notifyListeners(newState, previousState, context) {
for (const listener of this.listeners) {
try {
await listener(newState, previousState, context);
} catch (error) {
console.error('State change listener error:', error.message);
}
}
}
/**
* 获取状态历史
*/
getHistory() {
return this.history;
}
/**
* 获取状态持续时间
*/
getStateDuration(state) {
const entries = this.history.filter(h => h.state === state);
Iif (entries.length === 0) return 0;
const firstEntry = entries[0];
const nextEntry = this.history.find(h =>
h.timestamp > firstEntry.timestamp && h.state !== state
);
Eif (nextEntry) {
return nextEntry.timestamp - firstEntry.timestamp;
}
// 如果是当前状态，计算到现在的时间
if (this.state === state) {
return Date.now() - firstEntry.timestamp;
}
return 0;
}
/**
* 序列化状态机
*/
serialize() {
return {
state: this.state,
history: this.history,
metadata: this.metadata,
serializedAt: Date.now()
};
}
/**
* 从序列化数据恢复
*/
static deserialize(data) {
const machine = new StateMachine(data.state, { metadata: data.metadata });
machine.history = data.history || [];
return machine;
}
/**
* 判断是否为终态
*/
isFinalState() {
return [OrchestrationState.COMPLETED, OrchestrationState.FAILED, OrchestrationState.CANCELLED].includes(this.state);
}
/**
* 判断是否可以重试
*/
canRetry() {
return this.state === OrchestrationState.FAILED;
}
}
/**
* 编排任务类
*/
class OrchestrationTask {
constructor(taskId, definition) {
this.taskId = taskId;
this.definition = definition;
this.stateMachine = new StateMachine(OrchestrationState.PENDING, {
metadata: { taskId, definition }
});
this.createdAt = Date.now();
this.updatedAt = Date.now();
}
async start() {
await this.stateMachine.transition(OrchestrationState.RUNNING, { action: 'start' });
this.updatedAt = Date.now();
}
async complete(result = {}) {
await this.stateMachine.transition(OrchestrationState.COMPLETED, { action: 'complete', result });
this.updatedAt = Date.now();
}
async fail(error) {
await this.stateMachine.transition(OrchestrationState.FAILED, { action: 'fail', error: error.message });
this.updatedAt = Date.now();
}
async pause() {
await this.stateMachine.transition(OrchestrationState.PAUSED, { action: 'pause' });
this.updatedAt = Date.now();
}
async resume() {
await this.stateMachine.transition(OrchestrationState.RUNNING, { action: 'resume' });
this.updatedAt = Date.now();
}
async cancel() {
await this.stateMachine.transition(OrchestrationState.CANCELLED, { action: 'cancel' });
this.updatedAt = Date.now();
}
getStatus() {
return {
taskId: this.taskId,
state: this.stateMachine.getState(),
createdAt: this.createdAt,
updatedAt: this.updatedAt,
history: this.stateMachine.getHistory(),
isFinal: this.stateMachine.isFinalState(),
canRetry: this.stateMachine.canRetry()
};
}
}
module.exports = {
OrchestrationState,
STATE_TRANSITIONS,
StateMachine,
OrchestrationTask
};
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