文章目录

  • TransactionManager Diagram
    • 接口定义
      • getTransaction
      • TransactionDefinition
        • getPropagationBehavior
        • getIsolationLevel
        • isReadOnly
      • commit
      • rollback
    • Abstract帮助类
      • 属性
      • getTransaction
      • commit & rollback
    • 实现类R2dbcTransactionManager

TransactionManager Diagram

接口定义

这是一个空接口,既没有定义方法,也没有提供常量.这只是为了统一传统方式(PlatformTransactionManager)和reactive方式(ReactiveTransactionManager),这两个子接口类似,都是定义了三个,方法名和入参一致,只是返回值reactive的是Mono的类型


下面详细说下接口中对着三个方法的规定

getTransaction

这个接口用于获取一个transaction,可能是已有的,也可能是新增的.根据入参配置来.入参配置是一个接口,包含了配置项以及这个配置项范围,具体代码如下

TransactionDefinition

public interface TransactionDefinition {int PROPAGATION_REQUIRED = 0;int PROPAGATION_SUPPORTS = 1;int PROPAGATION_MANDATORY = 2;int PROPAGATION_REQUIRES_NEW = 3;int PROPAGATION_NOT_SUPPORTED = 4;int PROPAGATION_NEVER = 5;int PROPAGATION_NESTED = 6;int ISOLATION_DEFAULT = -1;int ISOLATION_READ_UNCOMMITTED = 1;  int ISOLATION_READ_COMMITTED = 2;  int ISOLATION_REPEATABLE_READ = 4;  int ISOLATION_SERIALIZABLE = 8;  int TIMEOUT_DEFAULT = -1;default int getPropagationBehavior() {return PROPAGATION_REQUIRED;}default int getIsolationLevel() {return ISOLATION_DEFAULT;}default int getTimeout() {return TIMEOUT_DEFAULT;}default boolean isReadOnly() {return false;}@Nullabledefault String getName() {return null;}static TransactionDefinition withDefaults() {return StaticTransactionDefinition.INSTANCE;}
}final class StaticTransactionDefinition implements TransactionDefinition {static final StaticTransactionDefinition INSTANCE = new StaticTransactionDefinition();private StaticTransactionDefinition() {}
}

getPropagationBehavior

这个是获取事务的传播方式,根据当前有无事务来采取不同的措施

当前有事务 当前无事务
PROPAGATION_REQUIRED 沿用 创建
PROPAGATION_SUPPORTS 沿用 不创建
PROPAGATION_MANDATORY 沿用 异常
PROPAGATION_REQUIRES_NEW 挂起后创建 创建
PROPAGATION_NOT_SUPPORTED
PROPAGATION_NEVER 异常 不创建
PROPAGATION_NESTED 创建内嵌 创建

对PropagationBehavior更进一步的研究可以参见SpringBoot中的Transaction研究（二）PropagationBehavior

getIsolationLevel

至于隔离级别是老生常谈,有兴趣的可以参见On Transaction系列
需要注意的是如果沿用了当前的事务,那么隔离级别这个配置是不会生效的

isReadOnly

这个是用于优化时的配置项,与其他配置项不同,如果不支持可以直接忽略,而对于其他配置项如果不支持则要抛异常.

commit

提交当前的事务,然后针对上面隔离级别采用不同的措施,例如恢复刚挂起的事务
需要注意的是commit也有可能失败,这个时候需要由TransactionManager自动rollback(或者无需rollback)

rollback

一般用于捕获异常后回滚,不包括commit的异常

Abstract帮助类

AbstractPlatformTransactionManager是一个帮助类,是PlatformTransactionManager的实现类,按照文档说明,建议自己实现PlatformTransactionManager的也继承这个抽象类，因为它已经解决了一个状态不对的问题，所以集成类只需要专心做doXXX即可。
另外还有一个AbstractReactiveTransactionManager是ReactiveTransactionManager的实现类，其中代码差不多，只是使用了reactive的语法。

属性

AbstractPlatformTransactionManager里面有以下属性并且提供了getter和setter

 private int transactionSynchronization = SYNCHRONIZATION_ALWAYS;private int defaultTimeout = TransactionDefinition.TIMEOUT_DEFAULT;private boolean nestedTransactionAllowed = false;private boolean validateExistingTransaction = false;private boolean globalRollbackOnParticipationFailure = true;private boolean failEarlyOnGlobalRollbackOnly = false;private boolean rollbackOnCommitFailure = false;

getTransaction

抛开里面的默认值,整个对于不同类型的PropagationBehavior的调用不同的方法

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Y
N
NEVER
NOT_SUPPORTED
REQUIRES_NEW
NESTED
Y
N
Y
N
MANDATORY
REQUIRED,REQUIRES_NEW,NESTED
Other
Other
Y
N
begin
isExistingTransaction
getPropagationBehavior
getPropagationBehavior
throw Exception
prepareTransactionStatus
startTransaction
isNestedTransactionAllowed
useSavepointForNestedTransaction
isValidateExistingTransaction...

综上所述,最终结果出了抛出异常外就是startTransaction和prepareTransactionStatus。这两个方法也很类似，第一步都是创建一个DefaultTransactionStatus对象作为返回值，最后一步都是通过调用*prepareSynchronization(DefaultTransactionStatus status, TransactionDefinition definition)*把相关参数设置到TransactionSynchronizationManager里面的ThreadLocal里。只是startTransaction还有额外的一步也就是它的第二步，调用了doBegin这个抽象方法。

commit & rollback

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path{stroke-width:0}#mermaid-svg-MzLd90ibu8lTxerC .today{fill:none;stroke:red;stroke-width:2px}#mermaid-svg-MzLd90ibu8lTxerC .task{stroke-width:2}#mermaid-svg-MzLd90ibu8lTxerC .taskText{text-anchor:middle;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-MzLd90ibu8lTxerC .taskText:not([font-size]){font-size:11px}#mermaid-svg-MzLd90ibu8lTxerC .taskTextOutsideRight{fill:#000;text-anchor:start;font-size:11px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-MzLd90ibu8lTxerC .taskTextOutsideLeft{fill:#000;text-anchor:end;font-size:11px}#mermaid-svg-MzLd90ibu8lTxerC .task.clickable{cursor:pointer}#mermaid-svg-MzLd90ibu8lTxerC .taskText.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-MzLd90ibu8lTxerC .taskTextOutsideLeft.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-MzLd90ibu8lTxerC 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text{fill:#9370db;stroke:none;font-size:10px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-MzLd90ibu8lTxerC g.stateGroup text{fill:#9370db;fill:#333;stroke:none;font-size:10px}#mermaid-svg-MzLd90ibu8lTxerC g.statediagram-cluster .cluster-label text{fill:#333}#mermaid-svg-MzLd90ibu8lTxerC g.stateGroup .state-title{font-weight:bolder;fill:#000}#mermaid-svg-MzLd90ibu8lTxerC g.stateGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-MzLd90ibu8lTxerC g.stateGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-MzLd90ibu8lTxerC .transition{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-MzLd90ibu8lTxerC .stateGroup .composit{fill:white;border-bottom:1px}#mermaid-svg-MzLd90ibu8lTxerC .stateGroup .alt-composit{fill:#e0e0e0;border-bottom:1px}#mermaid-svg-MzLd90ibu8lTxerC .state-note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-MzLd90ibu8lTxerC .state-note text{fill:black;stroke:none;font-size:10px}#mermaid-svg-MzLd90ibu8lTxerC .stateLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-MzLd90ibu8lTxerC .edgeLabel text{fill:#333}#mermaid-svg-MzLd90ibu8lTxerC .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-MzLd90ibu8lTxerC .node circle.state-start{fill:black;stroke:black}#mermaid-svg-MzLd90ibu8lTxerC .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-MzLd90ibu8lTxerC #statediagram-barbEnd{fill:#9370db}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-state .divider{stroke:#9370db}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-MzLd90ibu8lTxerC .note-edge{stroke-dasharray:5}#mermaid-svg-MzLd90ibu8lTxerC .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-MzLd90ibu8lTxerC .error-icon{fill:#522}#mermaid-svg-MzLd90ibu8lTxerC .error-text{fill:#522;stroke:#522}#mermaid-svg-MzLd90ibu8lTxerC .edge-thickness-normal{stroke-width:2px}#mermaid-svg-MzLd90ibu8lTxerC .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-MzLd90ibu8lTxerC .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-MzLd90ibu8lTxerC .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-MzLd90ibu8lTxerC .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-MzLd90ibu8lTxerC .marker{fill:#333}#mermaid-svg-MzLd90ibu8lTxerC .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-MzLd90ibu8lTxerC {color: rgba(0, 0, 0, 0.75);font: ;}

Y
N
isLocalRollbackOnly
commit
status.isCompleted
throw Exception
config
processRollback
!shouldCommitOnGlobalRollbackOnly&defStatus.isGlobalRollbackOnly
processRollback
else
processCommit
rollback

通过上面的图可以看出来最终也是走向了processCommit和processRollback这两个方法。我们清除里面的记录日志的代码后结果如下

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.edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-NT5lES69ob8jnBC2 .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-NT5lES69ob8jnBC2 .marker{fill:#333}#mermaid-svg-NT5lES69ob8jnBC2 .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-NT5lES69ob8jnBC2 {color: rgba(0, 0, 0, 0.75);font: ;}processCommitAbstractPlatformTransactionManagerTransactionSynchronizationUtilsTransactionSynchronizationimplprepareForCommitvoidtriggerBeforeCommittriggerBeforeCommitbeforeCommitvoidloop[every synchronization]voidopt[status isNewSynchronization]voidtriggerBeforeCompletiontriggerBeforeCompletionbeforeCompletionvoidloop[every synchronization]voidopt[status isNewSynchronization]voiddoCommitvoidopt[status isNewTransaction]triggerAfterCompletioninvokeAfterCompletionafterCompletionvoidloop[every synchronization]voidinvokeAfterCompletionafterCompletionvoidloop[every synchronization]voidalt[!status.hasTransaction ||status.isNewTransaction][!synchronizations.isEmpty]alt[status isNewSynchronization]voidtriggerAfterCompletionvoidtriggerBeforeCompletionvoidopt[!beforeCompletionInvoked]doRollbackOnCommitExceptiondoRollbackvoiddoSetRollbackOnlyvoidalt[status.isNewTransaction][status.hasTransaction]triggerAfterCompletionvoidalt[UNEXPECTED_ROLLBACK][TRANSACTION_EXCEPTION][RUNTIME_OR_ERROR]triggerAfterCommitvoidcleanupAfterCompletionvoidtriggerAfterCompletionvoidprocessCommitAbstractPlatformTransactionManagerTransactionSynchronizationUtilsTransactionSynchronizationimpl

实现类R2dbcTransactionManager

这个实现类里实现了各种doXXX，其中doCommit和doRollback都是通过得到Connection然后调用相应方法来实现，而doSetRollbackOnly是通过status得到ConnectionFactoryTransactionObject然后调用其setRollbackOnly来实现

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