创建
public class TransactionalCache implements Cache {
private Cache delegate;
private boolean clearOnCommit;
private Map<Object, AddEntry> entriesToAddOnCommit;
private Map<Object, RemoveEntry> entriesToRemoveOnCommit;
public TransactionalCache(Cache delegate) {
this.delegate = delegate;
this.clearOnCommit = false;
this.entriesToAddOnCommit = new HashMap<Object, AddEntry>();
this.entriesToRemoveOnCommit = new HashMap<Object, RemoveEntry>();
}
public void clear() {
reset();
clearOnCommit = true; //在提交时清楚内存中的缓存
}
public void commit() {
cache.removeObject(key);
}
private void reset() {
clearOnCommit = false;
entriesToRemoveOnCommit.clear();
entriesToAddOnCommit.clear();
}
总结：
底层就是map
清除缓存 调用clear方法