我遵循了Quarkus官方消息传递指南，并创建了一个简单的示例来使用AMQP（Apache Artemis）来体验Reactive消息传递功能。
完整的代码是here。
该示例正在运行，但是存在一个小问题，我必须先启动curl来使用消息，然后再使用另一个curl发送消息。
// start consumer side.
curl http://localhost:8080/messages -H "Accept:text/event-stream"
// start sending.
curl http://localhost:8080/messages -d "Hello, Quarkus" -H "Content-Type:text/plain"
// then the consumer exit.
// and sending a message will cause an exception.
如果取消使用者，然后发送消息，则会引发异常。
2020-10-12 20:18:54,137 WARN [io.net.cha.AbstractChannelHandlerContext] (vert.x-eventloop-thread-6) Failed to mark a promise as failure because it has failed already: DefaultChannelPromise@4bda4836(failure: java.nio.channels.ClosedChannelException), unnotified cause: java.nio.channels.ClosedChannelException
at io.netty.channel.AbstractChannel$AbstractUnsafe.newClosedChannelException(AbstractChannel.java:957)
at io.netty.channel.AbstractChannel$AbstractUnsafe.write(AbstractChannel.java:865)
at io.netty.channel.DefaultChannelPipeline$HeadContext.write(DefaultChannelPipeline.java:1367)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:767)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:767)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:767)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at io.vertx.core.net.impl.ConnectionBase.write(ConnectionBase.java:124)
at io.vertx.core.net.impl.ConnectionBase.lambda$queueForWrite$2(ConnectionBase.java:215)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:832)
: io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1
at io.netty.util.internal.ReferenceCountUpdater.toLiveRealRefCnt(ReferenceCountUpdater.java:74)
at io.netty.util.internal.ReferenceCountUpdater.release(ReferenceCountUpdater.java:138)
at io.netty.buffer.AbstractReferenceCountedByteBuf.release(AbstractReferenceCountedByteBuf.java:100)
at io.netty.handler.codec.http.DefaultHttpContent.release(DefaultHttpContent.java:92)
at io.netty.util.ReferenceCountUtil.release(ReferenceCountUtil.java:88)
at io.netty.channel.AbstractChannel$AbstractUnsafe.write(AbstractChannel.java:867)
at io.netty.channel.DefaultChannelPipeline$HeadContext.write(DefaultChannelPipeline.java:1367)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:767)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:767)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:767)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at io.vertx.core.net.impl.ConnectionBase.write(ConnectionBase.java:124)
at io.vertx.core.net.impl.ConnectionBase.lambda$queueForWrite$2(ConnectionBase.java:215)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:832)
即使没有连接使用者也可以在Apache Artemis中缓存消息。
答案 0 :(得分：0)
Apache ActiveMQ Artemis具有强大而灵活的addressing model。如果您的方案是点对点消息传递，则可以定义地址以定制代理配置，即：
<address name="messages">
<anycast>
<queue name="messages" />
</anycast>
</address>
代理将在启动时创建配置中定义的所有地址和队列，因此，发件人发送消息时，它将被路由到现有队列。