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To illustrate the problems caused by concurrent transactions, let s add two new operations to your book shop for increasing and checking the book stock. package com.apress.springenterpriserecipes.bookshop.spring; public interface BookShop { ... public void increaseStock(String isbn, int stock); public int checkStock(String isbn); } Then you implement these operations as follows. Note that these two operations should also be declared as transactional. package com.apress.springenterpriserecipes.bookshop.spring; ... import org.springframework.transaction.annotation.Transactional; public class JdbcBookShop extends JdbcDaoSupport implements BookShop { ... @Transactional public void increaseStock(String isbn, int stock) { String threadName = Thread.currentThread().getName(); System.out.println(threadName + "- Prepare to increase book stock"); getJdbcTemplate().update( "UPDATE BOOK_STOCK SET STOCK = STOCK + "+ "WHERE ISBN = ", new Object[] { stock, isbn }); System.out.println(threadName + "- Book stock increased by "+ stock); sleep(threadName); System.out.println(threadName + "- Book stock rolled back"); throw new RuntimeException("Increased by mistake"); } @Transactional public int checkStock(String isbn) { String threadName = Thread.currentThread().getName(); System.out.println(threadName + "- Prepare to check book stock"); int stock = getJdbcTemplate().queryForInt( "SELECT STOCK FROM BOOK_STOCK WHERE ISBN = ", new Object[] { isbn });

lib/bsh directory of the Spring installation) and cglib-nodep-2.1_3.jar (located in lib/cglib) in your

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System.out.println(threadName + "- Book stock is "+ stock); sleep(threadName); return stock; } private void sleep(String threadName) { System.out.println(threadName + "- Sleeping"); try { Thread.sleep(10000); } catch (InterruptedException e) {} System.out.println(threadName + "- Wake up"); } } To simulate concurrency, your operations need to be executed by multiple threads. You can track the current status of the operations through the println statements. For each operation, you print a couple of messages to the console around the SQL statement s execution. The messages should include the thread name for you to know which thread is currently executing the operation. After each operation executes the SQL statement, you ask the thread to sleep for 10 seconds. As you know, the transaction will be committed or rolled back immediately once the operation completes. Inserting a sleep statement can help to postpone the commit or rollback. For the increase() operation, you eventually throw a RuntimeException to cause the transaction to roll back. Before you start with the isolation level examples, enter the data from Tables 4-11 and 4-12 into your bookshop database. (Note that the ACCOUNT table isn t needed in this example.) Table 4-11. Sample Data in the BOOK Table for Testing Isolation Levels

<lang:bsh id="interestCalculator" script-source="classpath:com/apress/springrecipes/interest/ SimpleInterestCalculator.bsh" script-interfaces="com.apress.springrecipes.interest.InterestCalculator"> <lang:property name="rate" value="0.05" /> </lang:bsh> You also have to specify one or more interfaces in the script-interfaces attribute for a bean implemented with BeanShell. It s up to Spring to create a dynamic proxy for this bean and convert the Java method calls into BeanShell calls.

Sometimes your scripts may need the help of certain Java objects to complete their tasks. In Spring, you have to allow your scripts to access beans declared in the IoC container.

READ_UNCOMMITTED is the lowest isolation level that allows a transaction to read uncommitted changes made by other transactions. You can set this isolation level in the @Transaction annotation of your checkStock() method.

so it s virtually certain that the project will introduce new tools, components, and features that the developers haven t used before. But until you ve learned enough about them, how can you determine how long it will be before you can use them effectively

You can inject beans declared in the Spring IoC container into scripts in the same way as properties of simple data types.

package com.apress.springenterpriserecipes.bookshop.spring; ... import org.springframework.transaction.annotation.Isolation; import org.springframework.transaction.annotation.Transactional; public class JdbcBookShop extends JdbcDaoSupport implements BookShop { ... @Transactional(isolation = Isolation.READ_UNCOMMITTED) public int checkStock(String isbn) { ... } } You can create some threads to experiment on this transaction isolation level. In the following Main class, there are two threads you are going to create. Thread 1 increases the book stock, while thread 2 checks the book stock. Thread 1 starts 5 seconds before thread 2. package com.apress.springenterpriserecipes.bookshop.spring; ... public class Main { public static void main(String[] args) { ... final BookShop bookShop = (BookShop) context.getBean("bookShop"); Thread thread1 = new Thread(new Runnable() { public void run() { try { bookShop.increaseStock("0001", 5); } catch (RuntimeException e) {} } }, "Thread 1"); Thread thread2 = new Thread(new Runnable() { public void run() { bookShop.checkStock("0001"); } }, "Thread 2"); thread1.start(); try { Thread.sleep(5000); } catch (InterruptedException e) {} thread2.start(); } }

Suppose you would like the interest rate to be calculated dynamically. First, you define the following interface to allow implementations to return the annual, monthly, and daily interest rates: package com.apress.springrecipes.interest; public interface RateCalculator { public double getAnnualRate(); public double getMonthlyRate(); public double getDailyRate(); } For this example, you simply implement this interface by calculating these rates from a fixed annual interest rate, which can be injected through a setter method. package com.apress.springrecipes.interest; public class FixedRateCalculator implements RateCalculator { private double rate; public void setRate(double rate) { this.rate = rate; } public double getAnnualRate() { return rate; } public double getMonthlyRate() { return rate / 12; }

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