我有spring xd aws-s3源代码，我已经配置为根据我的文件大小更改为轮询器延迟。现在我的触发器建议afterReceive方法如何在Message<?> result文件中获取fileSize或lineCount 1}}？理想情况下，行数可以很好，因此我可以根据行或文件大小调整延迟
stream create aws-s3|log
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:int-aws="http://www.springframework.org/schema/integration/aws"
xmlns:int-file="http://www.springframework.org/schema/integration/file"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/integration/file
http://www.springframework.org/schema/integration/file/spring-integration-file.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
http://www.springframework.org/schema/integration/aws http://www.springframework.org/schema/integration/aws/spring-integration-aws-1.0.xsd">
<context:property-placeholder location="classpath*:dms-security-${region}.properties" />
<int:poller fixed-delay="${fixedDelay}" default="true" trigger="dynamicTrigger" ">
<int:advice-chain>
<ref bean="pollAdvise" />
<ref bean="smartPollAdvise" />
</int:advice-chain>
</int:poller>
<bean id="dynamicTrigger"
class="org.springframework.integration.util.DynamicPeriodicTrigger">
<constructor-arg name="period" value="5000" />
</bean>
<bean id="pollAdvise" class="org.springframework.integration.scheduling.PollSkipAdvice">
<constructor-arg ref="healthCheckStrategy"/>
</bean>
<bean id="smartPollAdvise" class="com.test.api.dms.main.TriggerAdvise">
<property name="trigger" ref="dynamicTrigger"/>
</bean>
<bean id="healthCheckStrategy" class="com.test.api.dms.main.ServiceHealthCheckPollSkipStrategy">
<property name="url" value="${url}"/>
<property name="doHealthCheck" value="${doHealthCheck}"/>
<property name="restTemplate" ref="restTemplate"/>
</bean>
<bean id="restTemplate"
class="org.springframework.web.client.RestTemplate">
<constructor-arg ref="requestFactory"/>
</bean>
<bean id="requestFactory"
class="com.test.api.dms.main.BatchClientHttpRequestFactory">
<constructor-arg ref="verifier"/>
</bean>
<bean id="verifier"
class="com.test.api.dms.main.NullHostnameVerifier">
</bean>
<bean id="encryptedDatum" class="com.test.api.dms.core.security.EncryptedSecuredDatum"/>
<!-- aws-endpoint="https://s3.amazonaws.com" proxyHost="proxy.kdc.test.com" proxyPort="8099"-->
<bean id="clientConfiguration" class="com.amazonaws.ClientConfiguration">
<property name="proxyHost" value="${proxyHost}"/>
<property name="proxyPort" value="${proxyPort}"/>
<property name="preemptiveBasicProxyAuth" value="false"/>
</bean>
<bean id="s3Operations" class="com.test.api.dms.main.CustomC1AmazonS3Operations">
<constructor-arg index="0" ref="clientConfiguration"/>
<property name="awsEndpoint" value="s3.amazonaws.com"/>
<property name="temporaryDirectory" value="${temporaryDirectory}"/>
<property name="awsSecurityKey" value="#{encryptedDatum.decryptBase64Encoded('${awsSecurityKey}')}"/>
</bean>
<bean id="credentials" class="org.springframework.integration.aws.core.BasicAWSCredentials">
</bean>
<!-- aws-endpoint="https://s3.amazonaws.com" -->
<int-aws:s3-inbound-channel-adapter aws-endpoint="s3.amazonaws.com"
bucket="${bucket}"
s3-operations="s3Operations"
credentials-ref="credentials"
file-name-wildcard="${fileNameWildcard}"
remote-directory="${prefix}"
channel="splitChannel"
local-directory="${localDirectory}"
accept-sub-folders="false"
delete-source-files="true"
archive-bucket="${archiveBucket}"
archive-directory="${archiveDirectory}">
</int-aws:s3-inbound-channel-adapter>
<int-file:splitter input-channel="splitChannel" output-channel="output" markers="false" charset="UTF-8">
<int-file:request-handler-advice-chain>
<bean class="org.springframework.integration.handler.advice.ExpressionEvaluatingRequestHandlerAdvice">
<property name="onSuccessExpression" value="payload.delete()"/>
</bean>
</int-file:request-handler-advice-chain>
</int-file:splitter>
<int:channel-interceptor pattern="*" order="3">
<bean class="org.springframework.integration.channel.interceptor.WireTap">
<constructor-arg ref="loggingChannel" />
</bean>
</int:channel-interceptor>
<int:logging-channel-adapter id="loggingChannel" log-full-message="true" level="INFO"/>
<int:channel id="output"/>
</beans>
public class TriggerAdvice extends AbstractMessageSourceAdvice {
private final DynamicPeriodicTrigger trigger;
private volatile long nextPollPeriod;
public TriggerAdvice(DynamicPeriodicTrigger trigger) {
this.trigger = trigger;
this.nextPollPeriod = trigger.getPeriod();
}
public long getNextPollPeriod() {
return nextPollPeriod;
}
public void setNextPollPeriod(long nextPollPeriod) {
this.nextPollPeriod = nextPollPeriod;
}
@Override
public boolean beforeReceive(MessageSource<?> source) {
return true;
}
@Override
public Message<?> afterReceive(Message<?> result, MessageSource<?> source) {
if (result == null) {
this.trigger.setPeriod(this.nextPollPeriod);
}
return null;
}
}
答案 0 :(得分：1)
aws-s3 source会返回Message<File>，因此您的afterReceive可以转换getPayload()并使用标准Java机制来计算文件中的行数：
LineNumberReader lnr = new LineNumberReader(new FileReader((File) result.getPayload());
lnr.skip(Long.MAX_VALUE);
System.out.println(lnr.getLineNumber() + 1); //Add 1 because line index starts at 0
// Finally, the LineNumberReader object should be closed to prevent resource leak
lnr.close();