流程引擎复杂的condition
时间: 2024-09-05 14:00:58 浏览: 19
流程引擎中的条件通常非常复杂,因为它们需要处理业务规则和决策逻辑,可能涉及到多种变量、运算符和分支结构。在流程设计中,常见的条件包括:
1. 条件判断:基于用户输入、系统状态或任务数据,设置if-else语句,比如当某个字段达到特定值时触发下一步操作。
2. 邮件通知:条件可以控制何时发送邮件给相关人员,如只有当某个步骤失败时才发送通知。
3. 并发控制:条件可能用于协调并发过程,例如限制同时执行的任务数量,或者等待前一项任务完成后再启动新的任务。
4. 表达式评估:支持更复杂的表达式,如XPath、JSON路径等,从复杂的结构化数据中提取信息来做出决策。
5. 触发器和事件驱动:流程可以根据特定时间点、某些事件的发生或满足特定条件而自动流转。
6. 路径选择:条件分支可能会导致流程走向不同的路径,这在流程图上表现为并行或多分支结构。
设计复杂的条件时,通常会使用流程引擎提供的可视化工具或脚本语言(如BPMN、JavaScript或Python),以确保逻辑清晰,易于维护。
相关问题
使用vue3实现流程引擎图的界面显示
Vue3是一种用于构建用户界面的现代JavaScript框架。流程引擎图则是一种用于表示业务流程的图形化工具。下面是使用Vue3实现流程引擎图的界面显示的步骤:
1. 安装Vue3:首先需要安装Vue3。可以使用npm或yarn进行安装。示例代码如下:
```bash
npm install vue@next
# or
yarn add vue@next
```
2. 安装流程引擎图工具:选择一个流程引擎图工具,比如Flowchart.js。可以使用npm或yarn进行安装。示例代码如下:
```bash
npm install flowchart.js
# or
yarn add flowchart.js
```
3. 创建Vue组件:创建一个Vue组件,用于显示流程引擎图。示例代码如下:
```javascript
<template>
<div>
<div ref="diagram"></div>
</div>
</template>
<script>
import flowchart from 'flowchart.js';
export default {
name: 'FlowchartDiagram',
props: {
chart: {
type: String,
required: true
},
options: {
type: Object,
default: () => ({})
}
},
mounted() {
// 创建流程引擎图
const diagram = flowchart.parse(this.chart);
// 设置选项
Object.assign(diagram, this.options);
// 渲染流程引擎图
diagram.drawSVG(this.$refs.diagram);
}
};
</script>
```
4. 使用Vue组件:将Vue组件添加到Vue应用中,以显示流程引擎图。示例代码如下:
```javascript
<template>
<div>
<FlowchartDiagram :chart="chart" :options="options" />
</div>
</template>
<script>
import FlowchartDiagram from './FlowchartDiagram.vue';
export default {
components: {
FlowchartDiagram
},
data() {
return {
chart: `
st=>start: Start
e=>end: End
op1=>operation: Operation 1
op2=>operation: Operation 2
cond=>condition: Condition
st->op1->cond
cond(yes)->op2->e
cond(no)->e
`,
options: {
'flowstate': {
'active': { 'fill': '#1abc9c', 'font-size': 15 },
'done': { 'fill': '#9b59b6', 'font-size': 15 },
'future': { 'fill': '#34495e', 'font-size': 15 }
},
'end-style': { 'fill': '#e74c3c', 'stroke-width': 0 },
'line-width': 3,
'line-length': 50,
'text-margin': 10,
'font-size': 14,
'font-color': 'black',
'element-color': 'black',
'fill': 'white',
'yes-text': 'yes',
'no-text': 'no',
'arrow-end': 'block',
'scale': 1,
'symbols': {
'start': { 'font-color': 'red', 'element-color': 'green', 'fill': 'yellow' },
'end': { 'class': 'end-element' }
}
}
};
}
};
</script>
```
这样,就可以通过Vue组件显示流程引擎图了。可以根据实际需求调整选项,以满足特定的业务需求。
Windwos 驱动WFP基本流程代码
WFP 驱动程序的基本流程代码如下:
```c
#include <ntddk.h>
#include <wdf.h>
#include <fwpmk.h>
#include <fwpvi.h>
#define WFP_DRIVER_TAG 'wfpd'
DRIVER_INITIALIZE DriverEntry;
EVT_WDF_DRIVER_DEVICE_ADD WfpEvtDeviceAdd;
EVT_WDF_OBJECT_CONTEXT_CLEANUP WfpEvtDriverContextCleanup;
typedef struct _WFP_DRIVER_CONTEXT {
HANDLE engineHandle;
UINT32 calloutId;
} WFP_DRIVER_CONTEXT, *PWFP_DRIVER_CONTEXT;
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(WFP_DRIVER_CONTEXT, WfpGetDriverContext)
NTSTATUS
DriverEntry(
_In_ PDRIVER_OBJECT DriverObject,
_In_ PUNICODE_STRING RegistryPath
)
{
NTSTATUS status;
WDF_DRIVER_CONFIG config;
WDF_DRIVER_CONFIG_INIT(&config, WdfEvtDriverDeviceAdd);
config.DriverPoolTag = WFP_DRIVER_TAG;
status = WdfDriverCreate(DriverObject, RegistryPath, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);
if (!NT_SUCCESS(status)) {
KdPrint(("WdfDriverCreate failed with status 0x%x\n", status));
}
return status;
}
NTSTATUS
WfpEvtDeviceAdd(
_In_ WDFDRIVER Driver,
_Inout_ PWDFDEVICE_INIT DeviceInit
)
{
NTSTATUS status;
WDFDEVICE device;
PWFP_DRIVER_CONTEXT driverContext;
HANDLE engineHandle;
FWP_BYTE_BLOB providerBlob;
FWPM_SESSION session;
FWPM_CALLOUT callout;
FWPM_DISPLAY_DATA displayData;
UINT32 calloutId;
FWPM_FILTER filter;
FWPM_FILTER_CONDITION filterConditions[1];
UNICODE_STRING filterName;
UNREFERENCED_PARAMETER(Driver);
KdPrint(("WfpEvtDeviceAdd called\n"));
status = WdfDeviceCreate(&DeviceInit, WDF_NO_OBJECT_ATTRIBUTES, &device);
if (!NT_SUCCESS(status)) {
KdPrint(("WdfDeviceCreate failed with status 0x%x\n", status));
return status;
}
driverContext = WfpGetDriverContext(WdfObjectGetDriver(device));
status = FwpmEngineOpen0(NULL, RPC_C_AUTHN_WINNT, NULL, NULL, &engineHandle);
if (!NT_SUCCESS(status)) {
KdPrint(("FwpmEngineOpen0 failed with status 0x%x\n", status));
return status;
}
providerBlob.size = sizeof(GUID);
providerBlob.data = (BYTE*)&GUID_WFP_DRIVER;
RtlZeroMemory(&session, sizeof(FWPM_SESSION));
session.flags = FWPM_SESSION_FLAG_DYNAMIC;
RtlZeroMemory(&callout, sizeof(FWPM_CALLOUT));
callout.displayData.name = L"WFP Callout";
callout.displayData.description = L"Callout for WFP driver";
callout.providerKey = providerBlob;
callout.applicableLayer = FWPM_LAYER_ALE_AUTH_CONNECT_V4;
callout.flags = FWPM_CALLOUT_FLAG_ALLOW_MID_STREAM_INSPECTION;
callout.calloutKey = GUID_WFP_CALLOUT;
status = FwpmCalloutAdd0(engineHandle, &callout, &session, &calloutId);
if (!NT_SUCCESS(status)) {
KdPrint(("FwpmCalloutAdd0 failed with status 0x%x\n", status));
FwpmEngineClose0(engineHandle);
return status;
}
RtlZeroMemory(&filter, sizeof(FWPM_FILTER));
RtlInitUnicodeString(&filterName, L"WFP Filter");
filter.displayData.name = filterName;
filter.layerKey = FWPM_LAYER_ALE_AUTH_CONNECT_V4;
filter.action.type = FWP_ACTION_CALLOUT_TERMINATING;
filter.action.calloutKey = GUID_WFP_CALLOUT;
filter.filterCondition = filterConditions;
filter.numFilterConditions = 1;
filterConditions[0].fieldKey = FWPM_CONDITION_IP_REMOTE_ADDRESS;
filterConditions[0].matchType = FWP_MATCH_EQUAL;
filterConditions[0].conditionValue.type = FWP_BYTE_ARRAY16_TYPE;
filterConditions[0].conditionValue.byteArray16[0] = 192;
filterConditions[0].conditionValue.byteArray16[1] = 168;
filterConditions[0].conditionValue.byteArray16[2] = 0;
filterConditions[0].conditionValue.byteArray16[3] = 1;
status = FwpmFilterAdd0(engineHandle, &filter, &session, &filter.filterId);
if (!NT_SUCCESS(status)) {
KdPrint(("FwpmFilterAdd0 failed with status 0x%x\n", status));
FwpmCalloutDeleteByKey0(engineHandle, &GUID_WFP_CALLOUT);
FwpmEngineClose0(engineHandle);
return status;
}
driverContext->engineHandle = engineHandle;
driverContext->calloutId = calloutId;
return status;
}
VOID
WfpEvtDriverContextCleanup(
_In_ WDFOBJECT DriverObject
)
{
PWFP_DRIVER_CONTEXT driverContext;
KdPrint(("WfpEvtDriverContextCleanup called\n"));
driverContext = WfpGetDriverContext(DriverObject);
FwpmFilterDeleteById0(driverContext->engineHandle, driverContext->calloutId);
FwpmCalloutDeleteByKey0(driverContext->engineHandle, &GUID_WFP_CALLOUT);
FwpmEngineClose0(driverContext->engineHandle);
}
```
以上代码是一个简单的 WFP 驱动程序,它实现了一个基于 IP 地址的过滤器,只允许指定的 IP 地址进行连接。在 `DriverEntry` 函数中创建了 WDF 驱动程序对象,并指定了设备添加回调函数 `WfpEvtDeviceAdd`。在 `WfpEvtDeviceAdd` 函数中创建了 WDF 设备对象,并初始化了 WFP 引擎、WFP 回调函数、WFP 过滤器等。在 `WfpEvtDriverContextCleanup` 函数中清理 WFP 引擎和 WFP 对象。需要注意的是,以上代码仅供参考,具体实现需要根据实际需求进行修改。