Something like:
```c++
main() {
...
transactionManager.begin();
try {
for (auto& key : batch) {
auto value = getValueFromExternalSystem(key);
cache.put(key, value);
}
transactionManager.commit();
} catch ( ... ) {
transactionManager.rollback();
}
}
int32_t getValuFromExternalSystem(int32_t key) {
if (random(10) == 0) {
throw "failed to get from external system";
}
return random(key);
}
```
[ Full content available at: https://github.com/apache/geode-native/pull/430 ]
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