提供基于两阶段提交（Try/Confirm/Cancel）的分布式事务实现方案

• JDK6+
• All RPC
• Springframework 3.2+

• 事务预提交
• 事务确认提交
• 事务回滚

• galaxy-demo-purchase：商城系统
• galaxy-demo-repository：库存系统
• galaxy-demo-order：订单系统

• 正常下单：localhost:8080/purchase/rest/{quantity}
• 模拟减库存失败：localhost:8080/purchase/rest/case/1
• 模拟下单失败：localhost:8080/purchase/rest/case/2
• 模拟减库存超时：localhost:8080/purchase/rest/case/3
• 模拟下单超时：localhost:8080/purchase/rest/case/4