| // Copyright (C) 2021 The Android Open Source Project |
| // |
| // Licensed 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 com.googlesource.gerrit.plugins.kafka.subscribe; |
| |
| import com.gerritforge.gerrit.eventbroker.EventMessage; |
| |
| /** Generic interface to a Kafka topic subscriber. */ |
| public interface KafkaEventSubscriber { |
| |
| /** |
| * Subscribe to a topic and receive messages asynchronously. |
| * |
| * @param topic Kafka topic name |
| * @param messageProcessor consumer function for processing incoming messages |
| */ |
| void subscribe(String topic, java.util.function.Consumer<EventMessage> messageProcessor); |
| |
| /** Shutdown Kafka consumer. */ |
| void shutdown(); |
| |
| /** |
| * Returns the current consumer function for the subscribed topic. |
| * |
| * @return the default topic consumer function. |
| */ |
| java.util.function.Consumer<EventMessage> getMessageProcessor(); |
| |
| /** |
| * Returns the current subscribed topic name. |
| * |
| * @return Kafka topic name. |
| */ |
| String getTopic(); |
| |
| /** Reset the offset for reading incoming Kafka messages of the topic. */ |
| void resetOffset(); |
| } |