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| Interface Summary | |
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| MementoCollector | The memento collector collects the mementos created before the command gets actually executed. |
| Class Summary | |
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| Memento | A memento is a snapshot of an object before it gets changed. |
| MementoManagerCommand | This transaction manages the mementos and restores them in case of a failure. |
| MementoTransaction | An atomic transaction to be executed on a PrevalentSystem. |
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