「一致性问题」TCC实现代码示例
在分布式事务中,TCC(Try-Confirm-Cancel)模式是一种常见的解决方案之一,用于确保多个操作的原子性。下面是一个简单的Java代码示例,演示了如何使用TCC模式实现张三向李四转账100元的操作:
import java.util.concurrent.atomic.AtomicInteger;
public class BankTransactionTCC {
// 模拟银行账户类
static class Account {
private String name;
private AtomicInteger balance;
public Account(String name, int balance) {
this.name = name;
this.balance = new AtomicInteger(balance);
}
public String getName() {
return name;
}
public int getBalance() {
return balance.get();
}
// 尝试转账,预留资金
public boolean tryTransfer(int amount) {
int currentBalance = balance.get();
if (currentBalance >= amount) {
return balance.compareAndSet(currentBalance, currentBalance - amount);
}
return false;
}
// 确认转账,提交事务
public void confirmTransfer(int amount) {
balance.addAndGet(-amount);
System.out.println(name + "向他人转账" + amount + "元,确认转账成功。");
}
// 取消转账,回滚事务
public void cancelTransfer(int amount) {
balance.addAndGet(amount);
System.out.println(name + "向他人转账" + amount + "元,转账失败,资金已回滚。");
}
}
// TCC事务管理器
static class TCCManager {
// 尝试转账
public static boolean tryTransfer(Account from, Account to, int amount) {
return from.tryTransfer(amount);
}
// 确认转账
public static void confirmTransfer(Account from, Account to, int amount) {
from.confirmTransfer(amount);
}
// 取消转账
public static void cancelTransfer(Account from, Account to, int amount) {
from.cancelTransfer(amount);
}
}
public static void main(String[] args) {
Account zhangSan = new Account("张三", 1000);
Account liSi = new Account("李四", 500);
// TCC模式实现转账
boolean trySuccess = TCCManager.tryTransfer(zhangSan, liSi, 100);
if (trySuccess) {
TCCManager.confirmTransfer(zhangSan, liSi, 100);
} else {
TCCManager.cancelTransfer(zhangSan, liSi, 100);
}
// 打印转账后的余额
System.out.println("张三的账户余额:" + zhangSan.getBalance());
System.out.println("李四的账户余额:" + liSi.getBalance());
}
}
原文地址:https://blog.csdn.net/u010720890/article/details/136475803
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