org.apache.dubbo.rpc

接口 AsyncContext

所有已知实现类:

AsyncContextImpl

public interface AsyncContext

AsyncContext works like javax.servlet.AsyncContext in the Servlet 3.0. An AsyncContext is stated by a call to RpcContext.startAsync().

The demo is com.alibaba.dubbo.examples.async.AsyncConsumer and com.alibaba.dubbo.examples.async.AsyncProvider

方法概要

限定符和类型	方法和说明
boolean	isAsyncStarted()
void	resetContext() Reset Context is not necessary.
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; } }

resetContext

void resetContext()

Reset Context is not necessary. Only reset context after result was write back if it is necessary. public class AsyncServiceImpl implements AsyncService { public String sayHello(String name) { final AsyncContext asyncContext = RpcContext.startAsync(); new Thread(() -> {

// the right place to use this method asyncContext.signalContextSwitch();

try { Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } asyncContext.write("Hello " + name + ", response from provider."); // only reset after asyncContext.write() asyncContext.resetContext(); }).start(); return null; } } public class AsyncServiceImpl implements AsyncService { public CompletableFuture sayHello(String name) { CompletableFuture future = new CompletableFuture(); final AsyncContext asyncContext = RpcContext.startAsync(); new Thread(() -> { // the right place to use this method asyncContext.signalContextSwitch(); // some operations... future.complete(); // only reset after future.complete() asyncContext.resetContext(); }).start(); return future; } }