使用Spring集成的事务性POP3邮箱访问

我们希望使用SpringIntegration2.1.1以事务方式读取POP3邮箱中的邮件。事务性是这样的，我们可以读取电子邮件并将其持久化到Oracle并从邮箱中删除。在事务回滚的情况下，我们希望电子邮件保留在邮箱中（即不被删除）

我们的问题是，尽管在一个事务中（稍后会有更多详细信息），邮箱还是会被打开，邮件会被检索、标记为删除并关闭连接，而不管事务的其余部分如何。这意味着，如果稍后出现故障，则不删除邮件为时已晚（因为连接已关闭，邮箱进入更新状态，从而永久删除电子邮件）

我们一直试图通过创建事务性轮询入站通道适配器来实现这一点：

<!-- This inbound channel adaptor interfaces to the sendmail POP3 queue -->
<int-mail:inbound-channel-adapter id="pop3PollingChannelAdaptor" 
                                  store-uri="pop3://myuser:myuser@100.100.100.100/inbox" 
                                  channel="receiveInboundEmailChannel" 
                                  should-delete-messages="true"              
                                  auto-startup="true" 
                                  java-mail-properties="javaMailProperties">
    <!-- Will poll every 20 seconds -->            
    <int:poller fixed-rate="10000" 
                max-messages-per-poll="1">
        <int:transactional transaction-manager="txManager"
                           isolation="DEFAULT"
                           propagation="REQUIRED"
                           read-only="false"
                           timeout="100000" />
    </int:poller>
</int-mail:inbound-channel-adapter>

将邮件放入入站电子邮件频道：

出站通道适配器（端点）将依次侦听该端口：

端点的实现目前使事情变得非常简单。我们现在不去数据库附近的任何地方，相反，如果我们想触发回滚，我们只会抛出一个异常

@MessageEndpoint
public class InboundEmailMessageEndpoint {
    @Transactional(propagation = Propagation.MANDATORY)
    public void processMessage(Message<MimeMessage> message) {

        MimeMessage mailMessage =  message.getPayload();

        // We throw exceptions here to cause a rollback if we need to during investigation...
    }
}

@MessageEndpoint
公共类InboundEmailMessageEndpoint{
@事务性（传播=传播。强制）
公共无效处理消息（消息消息）{
mimessage mailMessage=message.getPayload（）；
//如果在调查过程中需要，我们在这里抛出异常以导致回滚。。。
}
}

查看所有日志，我们可以在上下文中看到我们的问题（请注意，在端点中的其余工作开始之前，以及最重要的，在周围事务提交/回滚之前，POP3是如何“sayonara”的）：

15:32:25.256 INFO[main][org.springframework.transaction.jta.JtaTransactionManager]使用jta用户事务：com.atomikos.icatch.jta。UserTransactionImp@3228a1
15:32:25.256信息[main][org.springframework.transaction.jta.JtaTransactionManager]使用jta TransactionManager:com.atomikos.icatch.jta。UserTransactionManager@10980e7
15:32:25.422调试[task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager]getCompositeTransaction（）返回NULL！
15:32:25.422调试[task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager]getCompositeTransaction（）返回NULL！
15:32:25.423调试[task-scheduler-1][org.springframework.transaction.jta.JtaTransactionManager]创建名为[org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call]的新事务：需要传播，默认隔离，超时100000
15:32:25.423调试[task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager]getCompositeTransaction（）返回NULL！
15:32:25.423警告[task-scheduler-1][com.atomikos.icatch.imp.TransactionServiceImp]尝试创建超时超过com.atomikos.icatch.max_timeout的事务-截断为：300000
15:32:25.423调试[task-scheduler-1][com.atomikos.icatch.imp.CoordinatorImp]协调器10.9.21.7.tm0000100022进入状态：活动
15:32:25.425调试[task-scheduler-1][com.atomikos.icatch.imp.thread.TaskManager]任务管理器：正在初始化。。。
15:32:25.426信息[task-scheduler-1][com.atomikos.icatch.imp.thread.TaskManager]线程：使用JDK线程池。。。
15:32:25.428调试[task-scheduler-1][com.atomikos.icatch.imp.thread.TaskManager]线程：使用执行器类com.atomikos.icatch.imp.thread.Java15ExecutorFactory$executor
15:32:25.428调试[task-scheduler-1][com.atomikos.icatch.imp.thread.Java15ExecutorFactory]（1.5）执行任务：com.atomikos.timing。PooledAlarmTimer@18c4a7f
15:32:25.429调试[task-scheduler-1][com.atomikos.icatch.imp.thread.ThreadFactory]ThreadFactory:创建新线程：atomikos:0
15:32:25.429调试[task-scheduler-1][com.atomikos.icatch.imp.TransactionServiceImp]创建复合事务：10.9.21.7.tm0000100022
15:32:25.433信息[task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager]CreateCompisiteTransaction（100000000）：创建了id为10.9.21.7.TM000010022的新根事务
调试：JavaMail版本1.4.4
调试：已成功加载资源：/META-INF/javamail.default.providers
调试：加载的提供程序的表
调试：按类名列出的提供程序：{com.sun.mail.smtpsslttransport=javax.mail.Provider[TRANSPORT，smtps，com.sun.mail.smtp.smtpsslttransport，sun Microsystems，Inc]，com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT，smtp，com.sun.mail.smtps，com.SMTPTransport，sun Microsystems，Inc]，com.sun.mail.imapssltore=javax.mail.Provider[STORE，imaps，com.sun.mail.imap.IMAPSSLStore，sun Microsystems，Inc]，com.sun.mail.pop3.pop3ssstore=javax.mail.Provider[STORE，pop3s，com.sun.mail.pop3.pop3ssstore，sun Microsystems，Inc]，com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE，imap，com.sun.mail.mail.imap.IMAPStore，sun Microsystems，Inc]，com.sun[商店，pop3，com.sun.mail.pop3.POP3Store，sun Microsystems，Inc]]
调试：协议列出的提供程序：{imaps=javax.mail.Provider[STORE，imaps，com.sun.mail.imap.imapssltore，sun Microsystems，Inc]，imap=javax.mail.Provider[STORE，imap，com.sun.mail.imap.IMAPStore，sun Microsystems，Inc]，smtps=javax.mail.Provider[TRANSPORT，smtps，com.sun.mail.smtp.smtpsslttransport，sun Microsystems，Inc]，pop3=javax.mail.Provider[STORE，pop3，com.sun.mail.pop3.POP3Store，sun Microsystems，Inc]，pop3s=javax.mail.Provider[STORE，pop3s，com.sun.mail.pop3.pop3ssl，sun Microsystems，Inc]，smtp=javax.mail.Provider[TRANSPORT，smtp，com.sun.mail.SMTPTransport，sun Microsystems，Inc]]
调试：已成功加载资源：/META-INF/javamail.default.address.map
调试：getProvider（）返回javax.mail.Provider[STORE，pop3，com.sun.mail.pop3.POP3Store，sun Microsystems，Inc]
调试POP3:mail.POP3.rsetBeforeRequirement:false
调试POP3:mail.POP3.disabletop:false
调试POP3:mail.POP3.op
@MessageEndpoint
public class InboundEmailMessageEndpoint {
    @Transactional(propagation = Propagation.MANDATORY)
    public void processMessage(Message<MimeMessage> message) {

        MimeMessage mailMessage =  message.getPayload();

        // We throw exceptions here to cause a rollback if we need to during investigation...
    }
}

15:32:25.256 INFO  [main][org.springframework.transaction.jta.JtaTransactionManager]     Using JTA UserTransaction: com.atomikos.icatch.jta.UserTransactionImp@3228a1
15:32:25.256 INFO  [main][org.springframework.transaction.jta.JtaTransactionManager] Using JTA TransactionManager: com.atomikos.icatch.jta.UserTransactionManager@10980e7
15:32:25.422 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction() returning NULL!
15:32:25.422 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction() returning NULL!
15:32:25.423 DEBUG [task-scheduler-1][org.springframework.transaction.jta.JtaTransactionManager] Creating new transaction with name [org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,timeout_100000
15:32:25.423 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction() returning NULL!
15:32:25.423 WARN  [task-scheduler-1][com.atomikos.icatch.imp.TransactionServiceImp] Attempt to create a transaction with a timeout that exceeds com.atomikos.icatch.max_timeout - truncating to: 300000
15:32:25.423 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.CoordinatorImp] Coordinator 10.9.21.7.tm0000100022 entering state: ACTIVE
15:32:25.425 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.thread.TaskManager] TaskManager: initializing...
15:32:25.426 INFO  [task-scheduler-1][com.atomikos.icatch.imp.thread.TaskManager] THREADS: using JDK thread pooling...
15:32:25.428 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.thread.TaskManager] THREADS: using executor class com.atomikos.icatch.imp.thread.Java15ExecutorFactory$Executor
15:32:25.428 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.thread.Java15ExecutorFactory] (1.5) executing task: com.atomikos.timing.PooledAlarmTimer@18c4a7f
15:32:25.429 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.thread.ThreadFactory] ThreadFactory: creating new thread: Atomikos:0
15:32:25.429 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.TransactionServiceImp] Creating composite transaction: 10.9.21.7.tm0000100022
15:32:25.433 INFO  [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] createCompositeTransaction ( 100000000 ): created new ROOT transaction with id 10.9.21.7.tm0000100022
DEBUG: JavaMail version 1.4.4
DEBUG: successfully loaded resource: /META-INF/javamail.default.providers
DEBUG: Tables of loaded providers
DEBUG: Providers Listed By Class Name: {com.sun.mail.smtp.SMTPSSLTransport=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Sun Microsystems, Inc], com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Sun Microsystems, Inc], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Sun Microsystems, Inc], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun Microsystems, Inc]}
DEBUG: Providers Listed By Protocol: {imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc], imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Sun Microsystems, Inc], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Sun Microsystems, Inc], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun Microsystems, Inc], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Sun Microsystems, Inc], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]}
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: getProvider() returning javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun Microsystems, Inc]
DEBUG POP3: mail.pop3.rsetbeforequit: false
DEBUG POP3: mail.pop3.disabletop: false
DEBUG POP3: mail.pop3.forgettopheaders: false
DEBUG POP3: mail.pop3.cachewriteto: false
DEBUG POP3: mail.pop3.filecache.enable: false
DEBUG POP3: mail.pop3.keepmessagecontent: false
DEBUG POP3: mail.pop3.starttls.enable: false
DEBUG POP3: mail.pop3.starttls.required: false
15:32:25.446 DEBUG [task-scheduler-1][org.springframework.integration.mail.Pop3MailReceiver] connecting to store [pop3://devmail9:*****@100.100.100.100/inbox]
DEBUG POP3: mail.pop3.apop.enable: false
DEBUG POP3: mail.pop3.disablecapa: false
DEBUG POP3: connecting to host "100.100.100.100", port 110, isSSL false
S: +OK POP3 xxxxx.xxxx.xxxx.xxx.xxx.uk v4.39 server ready
C: CAPA
S: -ERR Unknown command in AUTHORIZATION state
C: USER myuser
S: +OK User name accepted, password please
C: PASS myuser
S: +OK Mailbox open, 3 messages
15:32:25.564 DEBUG [task-scheduler-1][org.springframework.integration.mail.Pop3MailReceiver] opening folder [pop3://myuser:*****@100.100.100.100/inbox]
C: STAT
S: +OK 3 5956
15:32:25.569 INFO  [task-scheduler-1][org.springframework.integration.mail.Pop3MailReceiver] attempting to receive mail from folder [inbox]
C: NOOP
S: +OK No-op to you too!
15:32:25.591 DEBUG [task-scheduler-1][org.springframework.integration.mail.Pop3MailReceiver] found 1 new messages
C: TOP 1 0
S: +OK Top of message follows
Received: from xxxxx.xxxx.xxxx.xxx.xxx.uk ([100.100.100.100]) by     xxxxx.xxxx.xxxx.xxx.xxx.uk (AIX5.2/8.11.6p2/8.11.0) with ESMTP id q57EUrG1544330 for C:    LIST 1

....

S: +OK 1 1996
15:32:25.604 DEBUG [task-scheduler-1][org.springframework.integration.mail.Pop3MailReceiver] Recieved 1 messages
15:32:26.097 DEBUG [task-scheduler-1][org.springframework.integration.mail.Pop3MailReceiver] USER flags are not supported by this mail server. Flagging message with system flag
DEBUG POP3: streaming msg 1
C: RETR 1
S: +OK 1996 octets
Received: from xxxxx.xxxx.xxxx.xxx.xxx.uk ([100.100.100.100]) by GLA610.crown.copfs.gsi.gov.uk (AIX5.2/8.11.6p2/8.11.0) with ESMTP id q57EUrG1544330 for <myuser@xxxxx.xxxx.xxxx.xxx.xxx.uk>; Thu, 7 Jun 2012 15:30:53 +0100

....

DEBUG POP3: streaming msg 1
C: RETR 1
S: +OK 1996 octets
Received: from xxxxx.xxxx.xxxx.xxx.xxx.uk ([100.100.100.100]) by xxxxx.xxxx.xxxx.xxx.xxx.uk (AIX5.2/8.11.6p2/8.11.0) with ESMTP id q57EUrG1544330 for <myuser@xxxxx.xxxx.xxxx.xxx.xxx.uk>; Thu, 7 Jun 2012 15:30:53 +0100

....

.
C: NOOP
S: +OK No-op to you too!
C: DELE 1
S: +OK Message deleted
C: QUIT
S: +OK Sayonara
15:32:26.672 DEBUG [task-scheduler-1][org.springframework.integration.mail.MailReceivingMessageSource] received mail message [javax.mail.internet.MimeMessage@ef4504]
15:32:26.696 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction()  returning instance with id 10.9.21.7.tm0000100022
15:32:26.697 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction()  returning instance with id 10.9.21.7.tm0000100022
15:32:26.697 DEBUG [task-scheduler-1][org.springframework.transaction.jta.JtaTransactionManager] Participating in existing transaction
15:32:26.716 INFO  [task-scheduler-1][xx.xxx.xxx.xxx.channel.email.InboundEmailMessageEndpoint] In InboundEmailMessageEndpoint.  processing MailMessage (Subject): 7777777777777777777
15:32:26.735 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction()  returning instance with id 10.9.21.7.tm0000100022
15:32:26.735 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction()  returning instance with id 10.9.21.7.tm0000100022
15:32:26.735 DEBUG [task-scheduler-1][org.springframework.transaction.jta.JtaTransactionManager] Initiating transaction commit
15:32:26.735 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction()  returning instance with id 10.9.21.7.tm0000100022
15:32:26.735 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction()  returning instance with id 10.9.21.7.tm0000100022
15:32:26.735 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction()  returning instance with id 10.9.21.7.tm0000100022
15:32:26.735 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.BaseTransactionManager] getCompositeTransaction()  returning instance with id 10.9.21.7.tm0000100022
15:32:26.736 INFO  [task-scheduler-1][com.atomikos.icatch.imp.CompositeTransactionImp] commit() done (by application) of transaction 10.9.21.7.tm0000100022
15:32:26.736 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.CoordinatorImp] Coordinator 10.9.21.7.tm0000100022 entering state: COMMITTING
15:32:26.740 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.CoordinatorImp] Coordinator 10.9.21.7.tm0000100022 entering state: TERMINATED
15:32:26.741 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.CoordinatorImp] Coordinator 10.9.21.7.tm0000100022 : stopping timer...
15:32:26.741 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.CoordinatorImp] Coordinator 10.9.21.7.tm0000100022 : disposing statehandler TERMINATED...
15:32:26.741 DEBUG [task-scheduler-1][com.atomikos.icatch.imp.CoordinatorImp] Coordinator 10.9.21.7.tm0000100022 : disposed.