我是ActiveMQ的新手，但我尝试过并且能够创建一个持久的发布商，但我无法设置客户端ID，因为我找不到任何有客户端ID的属性，甚至无法在Google中找到。如果我得到一些示例代码，将会很有帮助。
注意： 不是NMS协议。我在.NET Core Web API中使用 AMQP.Net Lite 与ActiveMQ一起使用ClientId创建持久的发布者/订阅者。
答案 0 :(得分：4)
为了创建对ActiveMQ或ActiveMQ Artemis的持久订阅，您的客户需要做一些事情。
设置一个唯一的＆＃34; client-id＆＃34;对于使用AMQP＆＃39; ContainerId＆＃39;的客户属性可以在下面的代码中看到。客户端每次连接时都必须使用相同的容器ID，并恢复它的持久订阅。
创建新会话。
为您要订阅的地址（在本例中为Topic）创建一个新的Receiver。持久订阅的源需要将地址设置为主题地址（在ActiveMQ中，这是topic：// name）。 Source还需要将expiray策略设置为NEVER，Source还必须将终端持久性状态设置为UNSETTLED_STATE，并将分发模式设置为COPY。
创建Receiver之后，您可以在启动时设置onMessage处理程序，也可以调用receive来消费消息（假设您已经授予代理向您发送信用的信用）。
using System;
using Amqp;
using Amqp.Framing;
using Amqp.Types;
using Amqp.Sasl;
using System.Threading;
namespace aorg.apache.activemq.examples
{
class Program
{
private static string DEFAULT_BROKER_URI = "amqp://localhost:5672";
private static string DEFAULT_CONTAINER_ID = "client-1";
private static string DEFAULT_SUBSCRIPTION_NAME = "test-subscription";
private static string DEFAULT_TOPIC_NAME = "test-topic";
static void Main(string[] args)
{
Console.WriteLine("Starting AMQP durable consumer example.");
Console.WriteLine("Creating a Durable Subscription");
CreateDurableSubscription();
Console.WriteLine("Attempting to recover a Durable Subscription");
RecoverDurableSubscription();
Console.WriteLine("Unsubscribe a durable subscription");
UnsubscribeDurableSubscription();
Console.WriteLine("Attempting to recover a non-existent durable subscription");
try
{
RecoverDurableSubscription();
throw new Exception("Subscription was not deleted.");
}
catch (AmqpException)
{
Console.WriteLine("Recover failed as expected");
}
Console.WriteLine("Example Complete.");
}
// Creating a durable subscription involves creating a Receiver with a Source that
// has the address set to the Topic name where the client wants to subscribe along
// with an expiry policy of 'never', Terminus Durability set to 'unsettled' and the
// Distribution Mode set to 'Copy'. The link name of the Receiver represents the
// desired name of the Subscription and of course the Connection must carry a container
// ID uniqure to the client that is creating the subscription.
private static void CreateDurableSubscription()
{
Connection connection = new Connection(new Address(DEFAULT_BROKER_URI),
SaslProfile.Anonymous,
new Open() { ContainerId = DEFAULT_CONTAINER_ID }, null);
try
{
Session session = new Session(connection);
Source source = CreateBasicSource();
// Create a Durable Consumer Source.
source.Address = DEFAULT_TOPIC_NAME;
source.ExpiryPolicy = new Symbol("never");
source.Durable = 2;
source.DistributionMode = new Symbol("copy");
ReceiverLink receiver = new ReceiverLink(session, DEFAULT_SUBSCRIPTION_NAME, source, null);
session.Close();
}
finally
{
connection.Close();
}
}
// Recovering an existing subscription allows the client to ask the remote
// peer if a subscription with the given name for the current 'Container ID'
// exists. The process involves the client attaching a receiver with a null
// Source on a link with the desired subscription name as the link name and
// the broker will then return a Source instance if this current container
// has a subscription registered with that subscription (link) name.
private static void RecoverDurableSubscription()
{
Connection connection = new Connection(new Address(DEFAULT_BROKER_URI),
SaslProfile.Anonymous,
new Open() { ContainerId = DEFAULT_CONTAINER_ID }, null);
try
{
Session session = new Session(connection);
Source recoveredSource = null;
ManualResetEvent attached = new ManualResetEvent(false);
OnAttached onAttached = (link, attach) =>
{
recoveredSource = (Source) attach.Source;
attached.Set();
};
ReceiverLink receiver = new ReceiverLink(session, DEFAULT_SUBSCRIPTION_NAME, (Source) null, onAttached);
attached.WaitOne(10000);
if (recoveredSource == null)
{
// The remote had no subscription matching what we asked for.
throw new AmqpException(new Error());
}
else
{
Console.WriteLine(" Receovered subscription for address: " + recoveredSource.Address);
Console.WriteLine(" Recovered Source Expiry Policy = " + recoveredSource.ExpiryPolicy);
Console.WriteLine(" Recovered Source Durability = " + recoveredSource.Durable);
Console.WriteLine(" Recovered Source Distribution Mode = " + recoveredSource.DistributionMode);
}
session.Close();
}
finally
{
connection.Close();
}
}
// Unsubscribing a durable subscription involves recovering an existing
// subscription and then closing the receiver link explicitly or in AMQP
// terms the close value of the Detach frame should be 'true'
private static void UnsubscribeDurableSubscription()
{
Connection connection = new Connection(new Address(DEFAULT_BROKER_URI),
SaslProfile.Anonymous,
new Open() { ContainerId = DEFAULT_CONTAINER_ID }, null);
try
{
Session session = new Session(connection);
Source recoveredSource = null;
ManualResetEvent attached = new ManualResetEvent(false);
OnAttached onAttached = (link, attach) =>
{
recoveredSource = (Source) attach.Source;
attached.Set();
};
ReceiverLink receiver = new ReceiverLink(session, DEFAULT_SUBSCRIPTION_NAME, (Source) null, onAttached);
attached.WaitOne(10000);
if (recoveredSource == null)
{
// The remote had no subscription matching what we asked for.
throw new AmqpException(new Error());
}
else
{
Console.WriteLine(" Receovered subscription for address: " + recoveredSource.Address);
Console.WriteLine(" Recovered Source Expiry Policy = " + recoveredSource.ExpiryPolicy);
Console.WriteLine(" Recovered Source Durability = " + recoveredSource.Durable);
Console.WriteLine(" Recovered Source Distribution Mode = " + recoveredSource.DistributionMode);
}
// Closing the Receiver vs. detaching it will unsubscribe
receiver.Close();
session.Close();
}
finally
{
connection.Close();
}
}
// Creates a basic Source type that contains common attributes needed
// to describe to the remote peer the features and expectations of the
// Source of the Receiver link.
private static Source CreateBasicSource()
{
Source source = new Source();
// These are the outcomes this link will accept.
Symbol[] outcomes = new Symbol[] {new Symbol("amqp:accepted:list"),
new Symbol("amqp:rejected:list"),
new Symbol("amqp:released:list"),
new Symbol("amqp:modified:list") };
// Default Outcome for deliveries not settled on this link
Modified defaultOutcome = new Modified();
defaultOutcome.DeliveryFailed = true;
defaultOutcome.UndeliverableHere = false;
// Configure Source.
source.DefaultOutcome = defaultOutcome;
source.Outcomes = outcomes;
return source;
}
}
}