Github user hmcl commented on a diff in the pull request:
https://github.com/apache/storm/pull/2480#discussion_r159119938
--- Diff:
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/metrics/KafkaOffsetMetric.java
---
@@ -0,0 +1,118 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.storm.kafka.spout.metrics;
+
+import com.google.common.base.Supplier;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.storm.kafka.spout.internal.OffsetManager;
+import org.apache.storm.metric.api.IMetric;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+public class KafkaOffsetMetric implements IMetric {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(KafkaOffsetMetric.class);
+ private final Supplier<Map<TopicPartition, OffsetManager>>
offsetManagerSupplier;
+ private final Supplier<KafkaConsumer> consumerSupplier;
+
+ public KafkaOffsetMetric(Supplier offsetManagerSupplier, Supplier
consumerSupplier) {
--- End diff --
What's the reasoning behind passing Supplier rather than the actual object?
---
