murblanc commented on a change in pull request #1962:
URL: https://github.com/apache/lucene-solr/pull/1962#discussion_r517207532
##########
File path:
solr/core/src/java/org/apache/solr/cluster/events/impl/ClusterEventProducerFactory.java
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@@ -0,0 +1,173 @@
+package org.apache.solr.cluster.events.impl;
+
+import org.apache.solr.api.ContainerPluginsRegistry;
+import org.apache.solr.cluster.events.ClusterEvent;
+import org.apache.solr.cluster.events.ClusterEventListener;
+import org.apache.solr.cluster.events.ClusterEventProducer;
+import org.apache.solr.cluster.events.ClusterEventProducerBase;
+import org.apache.solr.cluster.events.NoOpProducer;
+import org.apache.solr.core.CoreContainer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.invoke.MethodHandles;
+import java.util.Set;
+
+/**
+ * This class helps in handling the initial registration of plugin-based
listeners,
+ * when both the final {@link ClusterEventProducer} implementation and
listeners
+ * are configured using plugins.
+ */
+public class ClusterEventProducerFactory extends ClusterEventProducerBase {
+ private static final Logger log =
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+ private ContainerPluginsRegistry.PluginRegistryListener
initialPluginListener;
+ private boolean created = false;
+
+ public ClusterEventProducerFactory(CoreContainer cc) {
+ super(cc);
+ initialPluginListener = new
ContainerPluginsRegistry.PluginRegistryListener() {
Review comment:
Wouldn't code be easier to read/maintain if named classes were defined
rather than anonymous ones? They would have names that help understand their
function, class javadoc etc... I feel the anonymous classes in this PR have
enough content to justify a non anonymous implementation. That's likely just a
personal preference of mine so feel free to ignore.
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