The implementation principle and core function introduction of the API in the Java Class Library

The implementation principle and core function introduction of the API in the Java Class Library A series of operations refer to a series of operations as a overall execution process, or all success or all fails.The API in the Java class library is mainly to simplify and manage the process of transaction, and ensure the integrity and consistency of the data under concurrent execution. The API in the Java class library is based on the characteristics of the Java transaction architecture (JTA) and the Java database connection (JDBC).It allows developers to use consistent ways to handle different transaction resources (such as databases, message queues, etc.).The implementation principles and core functions of the API will be introduced below. 1. Affairs manager The transaction manager is mainly responsible for the life cycle of managing affairs, including the creation, submission, rollback and completion of affairs.It provides functions such as isolation, timeout settings and concurrent control of transaction.The transaction manager in the Java class library is defined using the TransactionManager interface. 2. Affairs definition and statement The definition and statement of transaction are used to specify the attributes and behaviors of transactions.The definition and statement in the Java class library uses annotations or programming methods.For example, the use of annotations can be marked with a method to use a method to use a method to use transactions. Example code: @Transactional public void myTransactionalMethod() { // Logic logic } 3. Affairs communication mechanism The transaction communication mechanism is used to determine how subdains interact with existing transactions when nested transactions call.The transaction communication mechanism in the Java class library is defined using the Propagation enumeration type.Common communication levels include Required, Requires_new, Nested, etc. Example code: @Transactional(propagation = Propagation.REQUIRES_NEW) public void myTransactionalMethod() { // Logic logic } 4. Affairs isolation level The transaction isolation level is used to control visibility and concurrency access between different transaction operations.The transaction isolation level in the Java library is defined using the ISOLATION enumeration type.Common isolation levels include Read_committed, Read_unCommitted, Serializable, etc. Example code: @Transactional(isolation = Isolation.READ_COMMITTED) public void myTransactionalMethod() { // Logic logic } 5. Affairs rollback and abnormal treatment Rolling transaction refers to the rollback operation when an abnormal or failure of transaction processing during the transaction processing process to ensure the consistency of the data.The Java library uses the Rollbackfor attribute to define which abnormal trigger transactions are rolled back. Example code: @Transactional(rollbackFor = {SQLException.class}) public void myTransactionalMethod() { // Logic logic } 6. Distributed transaction support Distributed transactions refer to transaction operations across multiple databases or message queues.The API in the Java Class Library also provides support for distributed transactions, using distributed transaction managers (such as Atomikos, Bitronix) to manage distributed transactions. Example code: @Transactional public void myDistributedTransactionalMethod() { // distributed transaction processing logic } Summarize: In the Java class library, APIs in the transaction API in the JAVA library, through the functions of transaction manager, transaction definition and statement, transaction communication mechanism, transaction isolation level, transaction rollback and abnormal processing, and distributed transaction support to achieve transaction management and control.Developers can use these APIs to simplify transaction operations and improve the readability and maintenance of code. Please note that the above code examples are for reference only. In actual use, it is necessary to achieve according to the specific framework and library.