Barrier (SeaTunnel : Engine : Server 2.3.7 API)

所有已知实现类:

CheckpointBarrier
```
public interface Barrier
```
barrier flowing in data flow

字段概要

字段
修饰符和类型字段说明

static Long PREPARE_CLOSE_BARRIER_ID

方法概要

所有方法实例方法抽象方法默认方法
修饰符和类型	方法	说明
`Set<TaskLocation>`	`closedTasks()`	Indicates a list of tasks that have been closed.
`long`	`getId()`	The ID of the barrier.
`boolean`	`prepareClose()`	Barrier indicating that the task should prepare to close.
`default boolean`	`prepareClose(TaskLocation task)`	Barrier indicating that the task should prepare to close.
`boolean`	`snapshot()`	Whether the task needs to perform a status snapshot after the barrier is aligned.

- 字段详细资料
  - PREPARE_CLOSE_BARRIER_ID
```
static final Long PREPARE_CLOSE_BARRIER_ID
```
- 方法详细资料
  - getId
```
long getId()
```
    The ID of the barrier.
  - snapshot
```
boolean snapshot()
```
    Whether the task needs to perform a status snapshot after the barrier is aligned. For example, DDL barrier does not require a snapshot.
  - prepareClose
```
boolean prepareClose()
```
    Barrier indicating that the task should prepare to close.
  - prepareClose
```
default boolean prepareClose(TaskLocation task)
```
    Barrier indicating that the task should prepare to close.
    
    参数:
    
    task - task location
    
    返回:
    
    If the task is included, the return true
  - closedTasks
```
Set<TaskLocation> closedTasks()
```
    Indicates a list of tasks that have been closed.
    
    返回: