我正在维护一个现有的 Spring Integration 应用程序,该应用程序正在轮询第三方 SFTP 服务器以获取文件。它偶尔会抛出权限或“未找到”错误,我怀疑这是由远程端的暂时性问题引起的。我希望应用程序重试获取这些错误,因为它可能会解决问题。(我还要求“重试任何问题”,这应该涵盖这种情况。)
例如
org.springframework.messaging.MessagingException: Problem occurred while synchronizing remote to local directory; nested exception is org.springframework.messaging.MessagingException: Failure occurred while copying from remote to local directory; nested exception is org.springframework.core.NestedIOException: failed to read file mypath/myfile.csv; nested exception is 3: Permission denied
at [snip]
Caused by: org.springframework.messaging.MessagingException: Failure occurred while copying from remote to local directory; nested exception is org.springframework.core.NestedIOException: failed to read file mypath/myfile.csv; nested exception is 3: Permission denied
at [snip]
Caused by: 3: Permission denied
at com.jcraft.jsch.ChannelSftp.throwStatusError(ChannelSftp.java:2846) [snip]
经过广泛的谷歌搜索和转圈,我仍然无法弄清楚如何使用 Spring Integration 做到这一点。这是现有的配置:
<bean id="myAcceptOnceFilter" class="org.springframework.integration.sftp.filters.SftpPersistentAcceptOnceFileListFilter">
<constructor-arg index="0" ref="myLocalFileStore"/>
<constructor-arg index="1" name="prefix" value="myprefix_"/>
<property name="flushOnUpdate" value="true"/>
</bean>
<bean id="myCompositeFilter" class="org.springframework.integration.file.filters.CompositeFileListFilter">
<constructor-arg>
<list>
<bean class="org.springframework.integration.sftp.filters.SftpSimplePatternFileListFilter">
<constructor-arg value="myprefix" />
</bean>
<ref bean="myAcceptOnceFilter"/>
</list>
</constructor-arg>
</bean>
<int-sftp:inbound-channel-adapter id="myInboundChannel"
session-factory="mySftpSessionFactory"
channel="myDownstreamChannel"
remote-directory="blah"
filter="myCompositeFilter"
local-directory="blah"
auto-create-local-directory="true"
>
<int:poller fixed-rate="10000" max-messages-per-poll="-1">
<int:transactional transaction-manager="transactionManager" synchronization-factory="syncFactory" />
</int:poller>
</int-sftp:inbound-channel-adapter>
编辑:我认为问题在于 myCompositeFilter。抛出异常时,看起来并没有在 myAcceptOnceFilter 内部调用 rollback() 。如果我只使用 myAcceptOnceFilter 而不使用复合,那么代码将按预期工作(即调用 rollback())。现在的问题是:我如何继续使用对所有子级调用回滚的 CompositeFilter?
我已经考虑在轮询器中放置一个重试适配器(编辑:我现在知道这无关紧要):
<bean id="retryAdvice" class="org.springframework.integration.handler.advice.RequestHandlerRetryAdvice"/>
<int:poller fixed-rate="10000" max-messages-per-poll="-1">
<int:advice-chain>
<tx:advice transaction-manager="transactionManager"/>
<int:ref bean="retryAdvice"/>
</int:advice-chain>
</int:poller>
...但这会引发警告
This advice org.springframework.integration.handler.advice.RequestHandlerRetryAdvice can only be used for MessageHandlers
简而言之,我被卡住了。任何有关让它重试这种 sftp 异常的帮助都将非常感激。谢谢!
编辑:添加提到 SftpPersistentAcceptOnceFileListFilter。编辑:添加了对 CompositeFileLIstFilter 的讨论,现在看起来像是问题的位置。