在我的项目中，我们尝试使用 Spring-Cloud-Stream（SCS）连接到Solace 。最终，我们计划搬到卡夫卡。因此，使用SCS将帮助我们轻松地迁移到Kafka，而无需进行任何代码更改，并且配置和依赖项的更改也很少。
我们使用JMS已有一段时间了。现在，当我们尝试使用SCS将消息发布到Solace时，我们注意到在消息中，一些关键的JMS标头（JMSMessageID，JMSType，JMSPriority，JMSCorrelationID，JMSExpiration）为空。
我们需要分别配置JMS标头吗？如果是，怎么办？
我试图这样设置标题，但这只会导致重复的标题具有相同的名称。
@Output(SendReport.TO_NMR)
public void sendMessage(String request) {
log.info("****************** Got this Report Request: " + request);
MessageBuilder<String> builder = MessageBuilder.withPayload(request);
builder.setHeader("JMSType","report-request");
builder.setHeader("JMSMessageId","1");
builder.setHeader("JMSCorrelationId","11");
builder.setHeader("JMSMessageID","4");
builder.setHeader("JMSCorrelationID","114");
builder.setHeader("ApplicationMessageId","111");
builder.setHeader("ApplicationMessageID","112");
builder.setCorrelationId("23434");
Message message = builder.build();
sendReport.output().send(message);
}
Solace中消息的JMS标题看起来像这样
JMSMessageID
JMSDestination TOPIC_NAME
JMSTimestamp Wed Dec 31 18:00:00 CST 1969
JMSType
JMSReplyTo
JMSCorrelationID
JMSExpiration 0
JMSPriority 0
JMSType nmr-report-request
JMSMessageId 1
JMSMessageID 4
_isJavaSerializedObject-contentType true
_isJavaSerializedObject-id true
solaceSpringCloudStreamBinderVersion 0.1.0
ApplicationMessageId 111
ApplicationMessageID 112
JMSCorrelationId 11
JMSCorrelationID 114
correlationId 23434
id [-84,-19,0,5,115,114,0,14,106,97,118,97,46,117,116,105,108,46,85,85,73,68,-68,-103,3,-9,-104,109,-123,47,2,0,2,74,0,12,108,101,97,115,116,83,105,103,66,105,116,115,74,0,11,109,111,115,116,83,105,103,66,105,116,115,120,112,13,-26,2,-51,111,-17,73,73,-18,-32,-26,-11,-46,-89,50,-37] (offset=377, length=80)
contentType [-84,-19,0,5,115,114,0,33,111,114,103,46,115,112,114,105,110,103,102,114,97,109,101,119,111,114,107,46,117,116,105,108,46,77,105,109,101,84,121,112,101,56,-76,29,-63,64,96,-36,-81,2,0,3,76,0,10,112,97,114,97,109,101,116,101,114,115,116,0,15,76,106,97,118,97,47,117,116,105,108,47,77,97,112,59,76,0,7,115,117,98,116,121,112,101,116,0,18,76,106,97,118] (offset=473, length=190)
timestamp 1555707627482
Spring Boot主类
@SpringBootApplication
@EnableDiscoveryClient
@Slf4j
@EnableBinding({SendReport.class})
public class ReportServerApplication {
public static void main(final String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-server.xml");
new SpringApplicationBuilder(ReportServerApplication.class).listeners(new EnvironmentPreparedListener()) .run(args);
}
将频道连接到主题的类：
public interface SendReport {
String TO_NMR = "solace-poc-outbound";
@Output(SendReport.TO_NMR)
MessageChannel output();
}
消息处理程序：
@Slf4j
@Component
@EnableBinding({SendReport.class})
public class MessageHandler {
private SendReport sendReport;
public MessageHandler(SendReport sendReport){
this.sendReport = sendReport;
}
@Output(SendReport.TO_NMR)
public void sendMessage(String request) {
log.info("****************** Got this Report Request: " + request);
var message = MessageBuilder.withPayload(request).build();
sendReport.output().send(message);
}
}
用于配置的属性：application.yml
spring:
cloud:
# spring cloud stream binding
stream:
bindings:
solace-poc-outbound:
destination: TOPIC_NAME
contentType: text/plain
solace:
java:
host: tcp://xyz.abc.com
#port: xxx
msgVpn: yyy
clientUsername: aaa
使用的依赖项：
'org.springframework.cloud:spring-cloud-stream',
'com.solace.spring.cloud:spring-cloud-starter-stream-solace:1.1.+'
答案 0 :(得分：2)
请参见JMS Message JavaDocs：
/** Sets the message ID.
*
* <P>This method is for use by JMS providers only to set this field
* when a message is sent. This message cannot be used by clients
* to configure the message ID. This method is public
* to allow a JMS provider to set this field when sending a message
* whose implementation is not its own.
*
* @param id the ID of the message
*
* @exception JMSException if the JMS provider fails to set the message ID
* due to some internal error.
*
* @see javax.jms.Message#getJMSMessageID()
*/
void
setJMSMessageID(String id) throws JMSException;
因此，无法从应用程序级别填充此属性。
在ActiveMQ中，我看到这样的代码：
msg.setMessageId(new MessageId(producer.getProducerInfo().getProducerId(), sequenceNumber));
// Set the message id.
if (msg != message) {
message.setJMSMessageID(msg.getMessageId().toString());
但是仍然：这不是我们可以从应用程序级别控制的。
可以从priority填充deliveryMode，timeToLive和JmsSendingMessageHandler：
if (this.jmsTemplate instanceof DynamicJmsTemplate && this.jmsTemplate.isExplicitQosEnabled()) {
Integer priority = StaticMessageHeaderAccessor.getPriority(message);
if (priority != null) {
DynamicJmsTemplateProperties.setPriority(priority);
}
if (this.deliveryModeExpression != null) {
Integer deliveryMode =
this.deliveryModeExpression.getValue(this.evaluationContext, message, Integer.class);
if (deliveryMode != null) {
DynamicJmsTemplateProperties.setDeliveryMode(deliveryMode);
}
}
if (this.timeToLiveExpression != null) {
Long timeToLive = this.timeToLiveExpression.getValue(this.evaluationContext, message, Long.class);
if (timeToLive != null) {
DynamicJmsTemplateProperties.setTimeToLive(timeToLive);
}
}
}
JmsCorrelationID必须由JmsHeaders.CORRELATION_ID填充。 JmsType中的JmsHeaders.TYPE：
public void fromHeaders(MessageHeaders headers, javax.jms.Message jmsMessage) {
try {
Object jmsCorrelationId = headers.get(JmsHeaders.CORRELATION_ID);
if (jmsCorrelationId instanceof Number) {
jmsCorrelationId = jmsCorrelationId.toString();
}
if (jmsCorrelationId instanceof String) {
try {
jmsMessage.setJMSCorrelationID((String) jmsCorrelationId);
}
catch (Exception e) {
this.logger.info("failed to set JMSCorrelationID, skipping", e);
}
}
Object jmsReplyTo = headers.get(JmsHeaders.REPLY_TO);
if (jmsReplyTo instanceof Destination) {
try {
jmsMessage.setJMSReplyTo((Destination) jmsReplyTo);
}
catch (Exception e) {
this.logger.info("failed to set JMSReplyTo, skipping", e);
}
}
Object jmsType = headers.get(JmsHeaders.TYPE);
if (jmsType instanceof String) {
try {
jmsMessage.setJMSType((String) jmsType);
}
catch (Exception e) {
this.logger.info("failed to set JMSType, skipping", e);
}
}
有关更多信息，请参见DefaultJmsHeaderMapper。