public void setSelectorHeaderName(String selectorHeaderName) {
    Assert.notNull(selectorHeaderName, "'selectorHeaderName' must not be null");
    this.selectorHeaderName = selectorHeaderName;
  }
Configure the name of a selector header that a subscription message can
have in order to filter messages based on their headers. The value of the
header can use Spring EL expressions against message headers.
<p>For example the following expression expects a header called "foo" to
have the value "bar":
<pre>
headers.foo == 'bar'
</pre>
<p>By default this is set to "selector".
@since 4.2
ambari-server/src/main/java/org/apache/ambari/server/agent/stomp/AmbariSubscriptionRegistry.java