[英]How do I perform a mongodb two phase commit in grails?
I'm working on a system that used mongodb. 我正在使用mongodb的系统上工作。 For a specific case, I'm required to be able to rollback saves.
对于特定情况,我需要能够回滚保存。 How do I go on doing using GORM?
我该如何继续使用GORM?
I just followed the instructions at http://docs.mongodb.org/manual/tutorial/perform-two-phase-commits . 我只是按照http://docs.mongodb.org/manual/tutorial/perform-two-phase-commits上的说明进行操作。 My code looks like:
我的代码如下:
FinancialTransaction financialTransaction = createFinancialTransaction(transactionType, amount, from, to,
process)
financialTransaction = financialTransaction.save(flush: true, failOnError: true)
financialTransaction.transactionStatus = FinancialTransactionStatusEnum.PENDING
financialTransaction = financialTransaction.save(flush: true, failOnError: true)
def transactionLineNumber = 1
financialTransaction.addToTransactionItems( new FinancialTransactionItem(financialAccount: from.financialAccount,
transactionLineNumber: transactionLineNumber++, debitAmount: amount, creditAmount: 0,
description: "Money debited from Unions account for loan." ))
financialTransaction.addToTransactionItems( new FinancialTransactionItem(financialAccount: to.financialAccount,
transactionLineNumber: transactionLineNumber++, creditAmount: amount, debitAmount: 0,
description: "Money credited to Coops account from a loan received from a Union." ))
financialTransaction.save( flush: true, failOnError: true)
financialTransaction.transactionItems.each() { transactionItem ->
financialAccount = transactionItem.financialAccount
if( financialAccount.pendingTransactions.contains(financialTransaction.id )) //transaction has been committed to this account(used during recovery)
return
delta = (transactionItem.debitAmount == 0) ? transactionItem.creditAmount : transactionItem.debitAmount
sign = (transactionItem.debitAmount == 0) ? 1.0 : -1.0
newBalance = financialAccount.totalBalance + delta * sign
financialAccount.totalBalance = newBalance
financialAccount.pendingTransactions << financialTransaction.id
financialAccount.save(flush: true, failOnError: true)
if(log.isDebugEnabled())
log.debug("Saved Financial Account Id: ${transactionItem.financialAccount.id} Balance: ${newBalance}")
new FinancialAccountChange(financialAccount: financialAccount, updatedBalance: newBalance,
delta: delta * sign, financialTransactionItem: transactionItem).save(flush: true, failOnError: true)
}
financialTransaction.transactionStatus = FinancialTransactionStatusEnum.COMMITTED
financialTransaction = financialTransaction.save(flush: true, failOnError: true)
financialTransaction.transactionItems*.financialAccount.each { fA ->
fA.pendingTransactions - financialTransaction.id
fA.save( flush: true, failOnError: true )
}
financialTransaction.transactionStatus = FinancialTransactionStatusEnum.DONE
financialTransaction = financialTransaction.save(flush: true, failOnError: true)
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