AsyncContext (Apache Dubbo 2.7.13 API)

所有已知实现类:

AsyncContextImpl
```
public interface AsyncContext
```
AsyncContext works like {@see javax.servlet.AsyncContext} in the Servlet 3.0. An AsyncContext is stated by a call to RpcContext.startAsync().
The demo is {@see com.alibaba.dubbo.examples.async.AsyncConsumer} and {@see com.alibaba.dubbo.examples.async.AsyncProvider}

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`boolean`	`isAsyncStarted()`
`void`	`signalContextSwitch()`	Signal RpcContext switch.
`void`	`start()`	change the context state to start
`boolean`	`stop()`	change the context state to stop
`void`	`write(Object value)`	write value and complete the async context.

- 方法详细资料
  - write
```
void write(Object value)
```
    write value and complete the async context.
    
    参数:
    
    value - invoke result
  - isAsyncStarted
```
boolean isAsyncStarted()
```
    返回:
    
    true if the async context is started
  - stop
```
boolean stop()
```
    change the context state to stop
  - start
```
void start()
```
    change the context state to start
  - signalContextSwitch
```
void signalContextSwitch()
```
    Signal RpcContext switch. Use this method to switch RpcContext from a Dubbo thread to a new thread created by the user. Note that you should use it in a new thread like this: public class AsyncServiceImpl implements AsyncService { public String sayHello(String name) { final AsyncContext asyncContext = RpcContext.startAsync(); new Thread(() -> { // right place to use this method asyncContext.signalContextSwitch(); try { Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } asyncContext.write("Hello " + name + ", response from provider."); }).start(); return null; } }