alpha/alpha-fsm/src/main/java/org/apache/servicecomb/pack/alpha/fsm/channel/rabbit/RabbitMessagePublisher.java

package org.apache.servicecomb.pack.alpha.fsm.channel.rabbit;

import org.apache.servicecomb.pack.alpha.core.fsm.channel.MessagePublisher;
import org.apache.servicecomb.pack.alpha.core.fsm.event.base.BaseEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.integration.support.MessageBuilder;

import java.lang.invoke.MethodHandles;

public class RabbitMessagePublisher implements MessagePublisher<BaseEvent> {

    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());


    private RabbitMessageChannel producerMessage;
    private int partitionCount;

    public RabbitMessagePublisher(int partitionCount, RabbitMessageChannel producerMessage) {

        this.partitionCount = partitionCount;
        this.producerMessage = producerMessage;

    }

    @Override
    public void publish(BaseEvent data) {

        String globalTxId = data.getGlobalTxId();
        int partitionIndex = (Math.abs(globalTxId.hashCode()))% partitionCount;
        if (LOG.isDebugEnabled()) {
            LOG.debug("send message [{}] to [{}]", data, partitionIndex);
        }
        //partitionKey 分区的名称必须与配置中的key保持一致
        producerMessage.messageChannel().send(MessageBuilder.withPayload(data).setHeader("partitionKey", partitionIndex).build());

    }
}