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Parameter Callback

(+) (#)

参数回调方式与调用本地callback或listener相同，只需要在Spring的配置文件中声明哪个参数是callback类型即可，Dubbo将基于长连接生成反向代理，这样就可以从服务器端调用客户端逻辑。
2.0.6及其以上版本支持

代码参见：http://code.alibabatech.com/svn/dubbo/trunk/dubbo-test/dubbo-test-examples/src/main/java/com/alibaba/dubbo/examples/callback

(1) 共享服务接口：

服务接口示例：

CallbackService.java
CallbackListener.java

(2) 服务提供者：

服务提供者接口实现示例：

CallbackServiceImpl.java

服务提供者配置示例：

(2) 服务消费者：

服务消费者配置示例：

consumer.xml

服务消费者调用示例：

CallbackServiceTest.java
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4 Comments

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  1. 一月 29, 2012

    Anonymous

    我参照例子写的,但是失败.

    这一步就报错了。提示尝试3次，服务端无返回错误。
    CallbackListener需要继承序列号接口吗？dubbo协议支持这种callback吗？

    1. 二月 06, 2012

      梁 飞

      非常抱歉，此为Callback功能的BUG，已在2.0.12版本修复此问题，参见：http://code.alibabatech.com/jira/browse/DUBBO-200

  2. 十二月 05, 2012

    Anonymous

    每次将调用端停止后就会出现这样的例外，以后再启动客户端此例外一直存在。

    2012-12-05 14:09:55,788 WARN [com.alibaba.dubbo.remoting.exchange.support.header.HeartBeatTask] - < [DUBBO] Exception when heartbeat to remote channel /192.168.19.31:20880, dubbo version: 2.5.3, current host: 192.168.19.31>
    com.alibaba.dubbo.remoting.RemotingException: Failed to send message Request [id=20, version=2.0.0, twoway=true, event=true, broken=false, data=null] to /192.168.19.31:39829, cause: null
    at com.alibaba.dubbo.remoting.transport.netty.NettyChannel.send(NettyChannel.java:108)
    at com.alibaba.dubbo.rpc.protocol.dubbo.ChannelWrappedInvoker$ChannelWrapper.send(ChannelWrappedInvoker.java:153)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeChannel.send(HeaderExchangeChannel.java:87)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeChannel.send(HeaderExchangeChannel.java:77)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeClient.send(HeaderExchangeClient.java:111)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeartBeatTask.run(HeartBeatTask.java:64)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)
    Caused by: java.nio.channels.ClosedChannelException
    at org.jboss.netty.channel.socket.nio.NioWorker.cleanUpWriteBuffer(NioWorker.java:643)
    at org.jboss.netty.channel.socket.nio.NioWorker.writeFromUserCode(NioWorker.java:370)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleAcceptedSocket(NioServerSocketPipelineSink.java:137)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:76)
    at org.jboss.netty.channel.Channels.write(Channels.java:632)
    at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:70)
    at com.alibaba.dubbo.remoting.transport.netty.NettyHandler.writeRequested(NettyHandler.java:99)
    at org.jboss.netty.channel.Channels.write(Channels.java:611)
    at org.jboss.netty.channel.Channels.write(Channels.java:578)
    at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:251)
    at com.alibaba.dubbo.remoting.transport.netty.NettyChannel.send(NettyChannel.java:98)

  3. 八月 15, 2013

    Anonymous

    用的版本是2.5.6 回调返回后一直报这个错误
    警告: [DUBBO] Exception when heartbeat to remote channel /192.168.17.93:20882, dubbo version: 2.5.3, current host: 192.168.17.93
    com.alibaba.dubbo.remoting.RemotingException: Failed to send message Request [id=19, version=2.0.0, twoway=true, event=true, broken=false, data=null] to /192.168.17.93:64005, cause: null
    at com.alibaba.dubbo.remoting.transport.netty.NettyChannel.send(NettyChannel.java:108)
    at com.alibaba.dubbo.rpc.protocol.dubbo.ChannelWrappedInvoker$ChannelWrapper.send(ChannelWrappedInvoker.java:153)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeChannel.send(HeaderExchangeChannel.java:87)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeChannel.send(HeaderExchangeChannel.java:77)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeClient.send(HeaderExchangeClient.java:111)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeartBeatTask.run(HeartBeatTask.java:64)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)
    at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
    Caused by: java.nio.channels.ClosedChannelException
    at org.jboss.netty.channel.socket.nio.NioWorker.cleanUpWriteBuffer(NioWorker.java:643)
    at org.jboss.netty.channel.socket.nio.NioWorker.writeFromUserCode(NioWorker.java:370)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleAcceptedSocket(NioServerSocketPipelineSink.java:137)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:76)
    at org.jboss.netty.channel.Channels.write(Channels.java:632)
    at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:70)
    at com.alibaba.dubbo.remoting.transport.netty.NettyHandler.writeRequested(NettyHandler.java:99)
    at org.jboss.netty.channel.Channels.write(Channels.java:611)
    at org.jboss.netty.channel.Channels.write(Channels.java:578)
    at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:251)
    at com.alibaba.dubbo.remoting.transport.netty.NettyChannel.send(NettyChannel.java:98)
    ... 14 more
    2013-8-15 15:22:24 com.alibaba.dubbo.common.logger.jcl.JclLogger warn
    警告: [DUBBO] Exception when heartbeat to remote channel /192.168.17.93:20882, dubbo version: 2.5.3, current host: 192.168.17.93
    com.alibaba.dubbo.remoting.RemotingException: Failed to send message Request [id=20, version=2.0.0, twoway=true, event=true, broken=false, data=null] to /192.168.17.93:64005, cause: null
    at com.alibaba.dubbo.remoting.transport.netty.NettyChannel.send(NettyChannel.java:108)
    at com.alibaba.dubbo.rpc.protocol.dubbo.ChannelWrappedInvoker$ChannelWrapper.send(ChannelWrappedInvoker.java:153)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeChannel.send(HeaderExchangeChannel.java:87)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeChannel.send(HeaderExchangeChannel.java:77)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeClient.send(HeaderExchangeClient.java:111)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeartBeatTask.run(HeartBeatTask.java:64)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)
    at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
    Caused by: java.nio.channels.ClosedChannelException
    at org.jboss.netty.channel.socket.nio.NioWorker.cleanUpWriteBuffer(NioWorker.java:643)
    at org.jboss.netty.channel.socket.nio.NioWorker.writeFromUserCode(NioWorker.java:370)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleAcceptedSocket(NioServerSocketPipelineSink.java:137)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:76)
    at org.jboss.netty.channel.Channels.write(Channels.java:632)
    at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:70)
    at com.alibaba.dubbo.remoting.transport.netty.NettyHandler.writeRequested(NettyHandler.java:99)
    at org.jboss.netty.channel.Channels.write(Channels.java:611)
    at org.jboss.netty.channel.Channels.write(Channels.java:578)
    at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:251)
    at com.alibaba.dubbo.remoting.transport.netty.NettyChannel.send(NettyChannel.java:98)
    ... 14 more

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