package cn.lihu.jh.framework.tenant.core.mq.kafka;
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import cn.hutool.core.util.ReflectUtil;
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import cn.lihu.jh.framework.tenant.core.context.TenantContextHolder;
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import org.apache.kafka.clients.producer.ProducerInterceptor;
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import org.apache.kafka.clients.producer.ProducerRecord;
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import org.apache.kafka.clients.producer.RecordMetadata;
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import org.apache.kafka.common.header.Headers;
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import org.springframework.messaging.handler.invocation.InvocableHandlerMethod;
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import java.util.Map;
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import static cn.lihu.jh.framework.web.core.util.WebFrameworkUtils.HEADER_TENANT_ID;
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/**
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* Kafka 消息队列的多租户 {@link ProducerInterceptor} 实现类
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*
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* 1. Producer 发送消息时，将 {@link TenantContextHolder} 租户编号，添加到消息的 Header 中
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* 2. Consumer 消费消息时，将消息的 Header 的租户编号，添加到 {@link TenantContextHolder} 中，通过 {@link InvocableHandlerMethod} 实现
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*
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* @author 芋道源码
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*/
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public class TenantKafkaProducerInterceptor implements ProducerInterceptor<Object, Object> {
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@Override
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public ProducerRecord<Object, Object> onSend(ProducerRecord<Object, Object> record) {
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Long tenantId = TenantContextHolder.getTenantId();
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if (tenantId != null) {
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Headers headers = (Headers) ReflectUtil.getFieldValue(record, "headers"); // private 属性，没有 get 方法，智能反射
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headers.add(HEADER_TENANT_ID, tenantId.toString().getBytes());
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}
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return record;
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}
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@Override
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public void onAcknowledgement(RecordMetadata metadata, Exception exception) {
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}
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@Override
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public void close() {
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}
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@Override
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public void configure(Map<String, ?> configs) {
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}
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}
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