5, transaction management
(1) transaction
l global affairs
Ø Use JTA management by the application server
Ø Ability to work with multi-transaction resources
l local affairs
Ø Resource Specification: If the transaction associated with JDBC
Ø Unable to cross the work between multi-transaction resources
Ø Cannot run in the global JTA transaction
l Different programming models
(2) Spring solution
l Use the same programming model for global and local affairs
Ø Different environments use different transaction management strategies
l Transaction management:
Ø Programming method
Ø Declaration mode (such as EJB CMT)
(3) Transaction extraction
l Transactions Extract through the PlatformTransactionManager interface
Ø GetTransaction (TransactionsDefinition)
Ø Commit (TransactionsTatus)
Ø Rollback (TransactionsTatus)
l TransactionDefinition: Isolation, propagation, timeout, and read-only state
l TransactionsTatus
Ø isnewtransaction ()
Ø setRollbackOnly ()
Ø IsrollbackOnly ()
(4) Transaction management
l Built-in platform transaction management:
Ø JTATRRANSCRIONMANAGER
Ø DataSourceTransacrionManager
Ø HibernateTransacrionManager
Ø JDOTRANSCRIONMANAGER
(5) example
l Define a JTATRANSACRIONMANAGER
Class = "... Transaction.jta.jtatransactionManager" /> Data sources must be configured as transaction resources in the application server l Define a DataSourceTransacrionManager Class = "Org.apache.commons.dbcp.basicdataasource"> ... Class = "... jdbc.datasource.datasourcetransactionManager"> L Defines a HibernateTransacrionManager Class = "... ORM.HIBERNATE.LOCALESSIONFAAANEBEAN"> ... Class = "... Orm.Hibernate.HibernateTransactionManager"> Use JTA to apply Hibernate without HibernateTransacrionManager, just configure JTATRRANSCRIONMANAGER, give the sessionFactory data source obtained from JNDI (6) TransactionTemplate l Programming method transaction management l Create a TransactionTemplate PlatformTransactionManager TransactionManager = (PlatformTransactionManager) CTX.getBean ("MyTransactionManager); TransactionTemplate Transaction = New TransactionTemplate (TransactionManager); l Execute in a transaction Transaction.execute (New TransactionCallbackwithoutResult () { Public void DointransactionwithoutResult (TransactionsTatus s) { UpdateOperation1 (); UpdateOperation2 (); } }); l TransactionTemplate other methods Ø setPropagationBehavior (int) Ø setisolationledLel (int) Ø setReadonly (Boolean) Ø settimeout (int) (7) Benefits l Conversion between different transaction management Ø just some configuration Ø Do not change the code l The same components can be run: Ø Application server using JTA transaction Ø Independent application or Web container: use JDBC or open source JTA (such as JOTM) (8) Declaration of affairs l Don't need TransactionTemplate l Implement using Spring AOP l Similar to EJB CMT: Specifies a transaction behavior to an independent method L and EJB CMT: Ø Apply to any Pojo Ø No need to bind to JTA (you can work with JDBC, JDO, and Hibernate) Ø has a declarative ROLLBACK rule Ø Custom transaction behavior Ø No need to support transaction context via remote call (9) TransactionAttributeSourceLeL defines how transaction attributes apply l TransactionAttributeEditor reads the definition of the following form: Ø Propagation_name, isolation_name, readonly, exception1, -exception2 Ø The front of the abnormal name means submit (commit) even if it is abnormal; the exception name - indicates that the rollback is required (ROLLBACK) l example: Ø Propagation_mandatory, isolation_default, -createexception, -duplicateKeyException (10) Statement affairs l Defining a transaction interceptor Class = "... matchalwaystransactionattributesource"> Class = "... transaction.interceptor.transactioninterceptor"> MatchalwayStransactionAttributeSource apps the same properties to all methods l-variable transactiontnessattributesource Class = "... interceptor.namematchtransactionattributesource"> Get * = propagation_required, readonly Find * = propagation_required, readonly Load * = propagation_required, readonly Store * = Propagation_Required NameMatchTransactionAttributeSource Apply specific attributes to matching methods l Auto Agent Business Beans Class = "... framework.autoproxy.beannameautoproxycreator"> l Use metadata properties Class = "... aop.framework.autoproxy.defaultadvisorautoproxycreator"> Class = "... transaction.interceptource.transactionattributesourceadvisor" Autowire = "constructor"> Class = "... transaction.interceptor.transactioninterceptor" AutoWire = "ByType"> Class = "... transaction.interceptor.attributestransactionattributesource" Autowire = "constructor"> Class = "... Metadata.commons.commonsattributes">
