Exclude self from static cluster connectors

The static-connectors of a cluster should not contain this brokers'
own connector as it will happily connect to itself and thus not
properly participate in the cluster.

Also added an option to configure allow-direct-connections-only and
set it to false. This would allow a cluster to become dynamic using
an initial static list.

REFERENCE.md

@@ -407,6 +407,7 @@ The following parameters are available in the `activemq::instance` defined type:
 * [`address_settings`](#-activemq--instance--address_settings)
 * [`addresses`](#-activemq--instance--addresses)
 * [`allow_failback`](#-activemq--instance--allow_failback)
+* [`allow_direct_connections_only`](#-activemq--instance--allow_direct_connections_only)
 * [`bind`](#-activemq--instance--bind)
 * [`broadcast_groups`](#-activemq--instance--broadcast_groups)
 * [`broker_plugins`](#-activemq--instance--broker_plugins)
@@ -478,6 +479,16 @@ Data type: `Boolean`
 
 Should stop backup on live restart.
 
+##### <a name="-activemq--instance--allow_direct_connections_only"></a>`allow_direct_connections_only`
+
+Data type: `Optional[Boolean]`
+
+When using `static` for [`server_discovery`](#-activemq--server_discovery)
+only make connections to the defined connectors and not any other
+broker in the cluser.
+
+Default value: `true`
+
 ##### <a name="-activemq--instance--bind"></a>`bind`
 
 Data type: `String`

manifests/instance.pp

@@ -20,6 +20,10 @@
 # @param allow_failback
 #   Should stop backup on live restart.
 #
+# @param allow_direct_connections_only
+#   When using static server discovery only make connections to the
+#   defined connectors and not any other broker in the cluser.
+#
 # @param bind
 #   Configure which IP address to listen on. Should be either a FQDN
 #   or an IP address.
@@ -167,6 +171,7 @@
   String $java_xms = $activemq::java_xms,
   String $java_xmx = $activemq::java_xmx,
   # Optional parameters
+  Optional[Boolean] $allow_direct_connections_only = true,
   Optional[Integer] $global_max_size_mb = undef,
   Optional[String] $group = undef,
   Optional[Boolean] $service_enable = undef,
@@ -379,6 +384,7 @@
           'address_settings'                 => $address_settings,
           'addresses'                        => $addresses,
           'allow_failback'                   => $allow_failback,
+          'allow_direct_connections_only'    => $allow_direct_connections_only,
           'bind'                             => $bind,
           'broadcast_groups'                 => $broadcast_groups,
           'broker_plugins'                   => $_broker_plugins,

templates/broker.xml.epp

@@ -148,9 +148,12 @@ under the License.
             <message-load-balancing><%= $message_load_balancing %></message-load-balancing>
             <max-hops><%= $max_hops %></max-hops>
 <%   if $activemq::server_discovery == 'static' { -%>
-            <static-connectors allow-direct-connections-only="true">
+            <static-connectors allow-direct-connections-only="<%= $allow_direct_connections_only %>">
 <%   $connectors.each |$key, $value| { -%>
+<%#    # Do not add the connector that matches the name of this instance. -%>
+<%     if ($key != "artemis-${name}") { -%>
                <connector-ref><%= $key %></connector-ref>
+<%     } -%>
 <%   } -%>
             </static-connectors>
 <%   } -%>