Terokai faedah dan kes penggunaan aliran kerja Java

public class LeaveProcess {
    public static void main(String[] args) {
        // 创建工作流引擎
        WorkflowEngine engine = new WorkflowEngine();

        // 注册流程节点
        engine.registerNode("Manager", new ManagerNode());
        engine.registerNode("HR", new HRNode());
        engine.registerNode("CEO", new CEONode());

        // 创建请假流程
        Workflow workflow = new Workflow();
        workflow.addNode("Manager");
        workflow.addNode("HR");
        workflow.addNode("CEO");

        // 开始流程
        engine.startWorkflow(workflow);
    }
}

public class ManagerNode implements Node {
    public void execute(Context context) {
        System.out.println("部门经理审批通过");
        // 更新上下文状态
        context.set("managerApproved", true);
    }
}

public class HRNode implements Node {
    public void execute(Context context) {
        // 获取上下文状态
        boolean managerApproved = context.get("managerApproved");
        if (managerApproved) {
            System.out.println("人事部审批通过");
            // 更新上下文状态
            context.set("hrApproved", true);
        } else {
            System.out.println("人事部审批不通过");
            // 更新上下文状态
            context.set("hrApproved", false);
        }
    }
}

public class CEONode implements Node {
    public void execute(Context context) {
        // 获取上下文状态
        boolean hrApproved = context.get("hrApproved");
        if (hrApproved) {
            System.out.println("CEO审批通过");
        } else {
            System.out.println("CEO审批不通过");
        }
    }
}

public class OrderProcess {
    public static void main(String[] args) {
        // 创建工作流引擎
        WorkflowEngine engine = new WorkflowEngine();

        // 注册流程节点
        engine.registerNode("CreateOrder", new CreateOrderNode());
        engine.registerNode("PayOrder", new PayOrderNode());
        engine.registerNode("DeliverOrder", new DeliverOrderNode());

        // 创建订单处理流程
        Workflow workflow = new Workflow();
        workflow.addNode("CreateOrder");
        workflow.addNode("PayOrder");
        workflow.addNode("DeliverOrder");

        // 开始流程
        engine.startWorkflow(workflow);
    }
}

public class CreateOrderNode implements Node {
    public void execute(Context context) {
        System.out.println("订单创建成功");
        // 更新上下文状态
        context.set("orderCreated", true);
    }
}

public class PayOrderNode implements Node {
    public void execute(Context context) {
        // 获取上下文状态
        boolean orderCreated = context.get("orderCreated");
        if (orderCreated) {
            System.out.println("订单支付成功");
            // 更新上下文状态
            context.set("orderPaid", true);
        } else {
            System.out.println("订单支付失败");
            // 更新上下文状态
            context.set("orderPaid", false);
        }
    }
}

public class DeliverOrderNode implements Node {
    public void execute(Context context) {
        // 获取上下文状态
        boolean orderPaid = context.get("orderPaid");
        if (orderPaid) {
            System.out.println("订单发货成功");
        } else {
            System.out.println("订单发货失败");
        }
    }
}