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package com.example.spring.bank.tx;
import java.math.BigDecimal;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallback;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;
import com.example.spring.bank.Account;
import com.example.spring.bank.AccountManager;
/**
* This class decorates a given AccountManager by adding transaction boundaries.
*
* @author kamal
*
*/
public class TxAccountManager implements AccountManager {
private AccountManager accountManager;
public void setAccountManager(AccountManager accountManager) {
this.accountManager = accountManager;
}
private TransactionTemplate txTemplate;
public void setTxManager(DataSourceTransactionManager txManager) {
txTemplate = new TransactionTemplate(txManager);
}
@Override
public Account create() {
return txTemplate.execute(new TransactionCallback<Account>() {
@Override
public Account doInTransaction(TransactionStatus arg0) {
return accountManager.create();
}
});
}
@Override
public Account find(int accountNumber) {
return accountManager.find(accountNumber);
}
@Override
public Account deposit(int accountNumber, BigDecimal amount) {
return txTemplate.execute(new TransactionCallback<Account>() {
@Override
public Account doInTransaction(TransactionStatus arg0) {
return accountManager.deposit(accountNumber, amount);
}
});
}
@Override
public Account withdraw(int accountNumber, BigDecimal amount) {
return txTemplate.execute(new TransactionCallback<Account>() {
@Override
public Account doInTransaction(TransactionStatus arg0) {
return accountManager.withdraw(accountNumber, amount);
}
});
}
@Override
public void delete(int accountNumber) {
txTemplate.execute(new TransactionCallbackWithoutResult() {
@Override
protected void doInTransactionWithoutResult(TransactionStatus arg0) {
accountManager.delete(accountNumber);
}
});
}
@Override
public void chargeForLowBalance(BigDecimal minimumBalance, BigDecimal amount) {
txTemplate.execute(new TransactionCallbackWithoutResult() {
@Override
protected void doInTransactionWithoutResult(TransactionStatus arg0) {
accountManager.chargeForLowBalance(minimumBalance, amount);
}
});
}
@Override
public Account transfer(int accountNumber1, int accountNumber2, BigDecimal amount) {
return txTemplate.execute(new TransactionCallback<Account>() {
@Override
public Account doInTransaction(TransactionStatus status) {
try {
return accountManager.transfer(accountNumber1, accountNumber2, amount);
} catch (Exception e) {
// Some exception occurred.
status.setRollbackOnly();
throw e;
}
}
});
}
}
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