Bulkhead

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Summary:
Field |
Required |
Optional

Detail:
Field |
Element

```
@Documented
 @Retention(value=RUNTIME)
 @Target(value={METHOD,TYPE})
 @Inherited
public @interface Bulkhead
```
Define bulkhead policy to limit the number of the concurrent calls to an instance.
If this is used together with Asynchronous, it means thread isolation. Otherwise, it means semaphore isolation.
- Thread isolation - execution happens on a separate thread and the concurrent requests are confined in a fixed number of a thread pool.
- Semaphore isolation - execution happens on the calling thread and the concurrent requests are constrained by the semaphore count.

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element and Description
`int`	`value` Specify the maximum number of concurrent calls to an instance.
`int`	`waitingTaskQueue` Specify the waiting task queue.

- Element Detail
  - value
```
public abstract int value
```
    Specify the maximum number of concurrent calls to an instance. The value must be greater than 0. Otherwise, FaultToleranceDefinitionException occurs.
    
    Returns:
    
    the limit of the concurrent calls
    
    Default:
    
    10
- - waitingTaskQueue
```
public abstract int waitingTaskQueue
```
    Specify the waiting task queue. This setting only takes effect on asynchronous invocation, achieved by using Asynchronous. The value must be greater than 0. Otherwise, FaultToleranceDefinitionException occurs.
    
    Returns:
    
    the waiting queue size
    
    Default:
    
    10

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