org.apache.rocketmq.client.apis.consumer.SimpleConsumerBuilder Maven / Gradle / Ivy
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
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package org.apache.rocketmq.client.apis.consumer;
import java.time.Duration;
import java.util.Map;
import org.apache.rocketmq.client.apis.ClientConfiguration;
import org.apache.rocketmq.client.apis.ClientConfigurationBuilder;
import org.apache.rocketmq.client.apis.ClientException;
/**
* Builder to config and start {@link SimpleConsumer}.
*/
public interface SimpleConsumerBuilder {
/**
* Set the client configuration for the simple consumer.
*
* @param clientConfiguration client's configuration.
* @return the simple consumer builder instance.
*/
SimpleConsumerBuilder setClientConfiguration(ClientConfiguration clientConfiguration);
/**
* Set the load balancing group for the simple consumer.
*
* @param consumerGroup consumer load balancing group.
* @return the consumer builder instance.
*/
SimpleConsumerBuilder setConsumerGroup(String consumerGroup);
/**
* Add subscription expressions for the simple consumer.
*
* @param subscriptionExpressions subscriptions to add which use the map of topics to filter expressions.
* @return the consumer builder instance.
*/
SimpleConsumerBuilder setSubscriptionExpressions(Map subscriptionExpressions);
/**
* Set the max await time when receive messages from the server.
*
* The simple consumer will hold this long-polling receive requests until a message is returned or a timeout
* occurs.
*
*
Especially, the RPC request timeout for long-polling of {@link SimpleConsumer} is increased by
* {@linkplain ClientConfigurationBuilder#setRequestTimeout(Duration) request timeout} based on await duration here.
*
* @param awaitDuration The maximum time to block when no message is available.
* @return the consumer builder instance.
*/
SimpleConsumerBuilder setAwaitDuration(Duration awaitDuration);
/**
* Finalize the build of the {@link SimpleConsumer} instance and start.
*
*
This method will block until the simple consumer starts successfully.
*
*
Especially, if this method is invoked more than once, different simple consumers will be created and started.
*
* @return the simple consumer instance.
*/
SimpleConsumer build() throws ClientException;
}