SOLR-10738: Trigger has an init method which is called before schedule. Actions are init'ed in this method. Fixed NodeLostTriggerTest failures.

solr/core/src/java/org/apache/solr/cloud/autoscaling/AutoScaling.java

@@ -115,6 +115,12 @@ public class AutoScaling {
     public boolean isClosed();
 
     public void restoreState(Trigger<E> old);
+
+    /**
+     * Called before a trigger is scheduled. Any heavy object creation or initialisation should
+     * be done in this method instead of the Trigger's constructor.
+     */
+    public void init();
   }
 
   public static class TriggerFactory implements Closeable {

solr/core/src/java/org/apache/solr/cloud/autoscaling/NodeAddedTrigger.java

@@ -81,6 +81,17 @@ public class NodeAddedTrigger implements AutoScaling.Trigger<NodeAddedTrigger.No
     log.debug("NodeAddedTrigger {} instantiated with properties: {}", name, properties);
   }
 
+  @Override
+  public void init() {
+    List<Map<String, String>> o = (List<Map<String, String>>) properties.get("actions");
+    if (o != null && !o.isEmpty()) {
+      for (int i = 0; i < o.size(); i++) {
+        Map<String, String> map = o.get(i);
+        actions.get(i).init(map);
+      }
+    }
+  }
+
   @Override
   public void setListener(AutoScaling.TriggerListener<NodeAddedEvent> listener) {
     listenerRef.set(listener);

solr/core/src/java/org/apache/solr/cloud/autoscaling/NodeLostTrigger.java

@@ -82,6 +82,17 @@ public class NodeLostTrigger implements AutoScaling.Trigger<NodeLostTrigger.Node
     this.eventType = AutoScaling.EventType.valueOf(properties.get("event").toString().toUpperCase(Locale.ROOT));
   }
 
+  @Override
+  public void init() {
+    List<Map<String, String>> o = (List<Map<String, String>>) properties.get("actions");
+    if (o != null && !o.isEmpty()) {
+      for (int i = 0; i < o.size(); i++) {
+        Map<String, String> map = o.get(i);
+        actions.get(i).init(map);
+      }
+    }
+  }
+
   @Override
   public void setListener(AutoScaling.TriggerListener<NodeLostEvent> listener) {
     listenerRef.set(listener);

solr/core/src/java/org/apache/solr/cloud/autoscaling/ScheduledTriggers.java

@@ -143,10 +143,7 @@ public class ScheduledTriggers implements Closeable {
         return false;
       }
     });
-    List<TriggerAction> actions = newTrigger.getActions();
-    for (TriggerAction action : actions) {
-      action.init(newTrigger.getProperties());
-    }
+    newTrigger.init(); // mark as ready for scheduling
     scheduledTrigger.scheduledFuture = scheduledThreadPoolExecutor.scheduleWithFixedDelay(scheduledTrigger, 0, DEFAULT_SCHEDULED_TRIGGER_DELAY_SECONDS, TimeUnit.SECONDS);
   }
 

solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeLostTriggerTest.java

@@ -196,7 +196,17 @@ public class NodeLostTriggerTest extends SolrCloudTestCase {
     NodeLostTrigger trigger = new NodeLostTrigger("node_lost_trigger", props, container);
     trigger.setListener(noFirstRunListener);
     trigger.run();
-    newNode.stop();
+
+    // stop the newly created node
+    List<JettySolrRunner> jettySolrRunners = cluster.getJettySolrRunners();
+    for (int i = 0; i < jettySolrRunners.size(); i++) {
+      JettySolrRunner jettySolrRunner = jettySolrRunners.get(i);
+      if (newNode == jettySolrRunner) {
+        cluster.stopJettySolrRunner(i);
+        break;
+      }
+    }
+
     trigger.run(); // this run should detect the lost node
     trigger.close(); // close the old trigger