Question

我尝试按照1上的给定教程进行操作。我创建了一个主题，主题有2个订阅，分别使用sqlFilter（user_age＆lt; 50）和（user_age＆gt; = 50）。我有一个自定义属性user_age定义消息。但是当我发送关于该主题的消息时，两个订阅都收到相同的消息，这是无稽之谈！任何的想法？

我的代码完全受到tuto中给出的启发，除了我使用此代码接收来自给定订阅的消息：

resultQM = service.receiveSubscriptionMessage("MyTopic", subName, opts);

Answer 1

该教程中的代码无法正常运行。这是我用来创建两个订阅（LowMessages和HighMessages）的Java代码，它实际上过滤了用户定义的自定义属性“MessageNumber”的值。我发现这个有效。请注意，您需要明确地为ruleInfo指定一个名称（“RULENAME”），并且还需要显式删除订阅的默认“AllMatch”规则（或者您不进行过滤。）

  SubscriptionInfo subInfo = new SubscriptionInfo("LowMessages");
  CreateSubscriptionResult result = service.createSubscription("TestTopic", subInfo);
  RuleInfo ruleInfo = new RuleInfo("RULENAME");
  ruleInfo = ruleInfo.withSqlExpressionFilter("MessageNumber <= 3");
  CreateRuleResult ruleResult = service.createRule("TestTopic", "LowMessages", ruleInfo);
  service.deleteRule("TestTopic", "LowMessages", "$Default");

  SubscriptionInfo subInfo2 = new SubscriptionInfo("HighMessages");
  CreateSubscriptionResult result2 = service.createSubscription("TestTopic", subInfo2);
  RuleInfo ruleInfo2 = new RuleInfo("RULENAME2");
  ruleInfo2 = ruleInfo2.withSqlExpressionFilter("MessageNumber > 3");
  CreateRuleResult ruleResult2 = service.createRule("TestTopic", "HighMessages", ruleInfo2);
  service.deleteRule("TestTopic", "HighMessages", "$Default");

关于主题的服务总线订阅不适用过滤器

1 个答案: