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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | 2x 2x 5x 1x 4x 4x 4x 1x 3x 3x 1x 2x 2x | import { IAgingCacheDeleteStrategy } from './IAgingCacheWriteStrategy';
import { IAgingCacheWrite } from './IAgingCache';
import { AgingCacheWriteStrategy } from './AgingCacheWriteStrategy';
/**
* Strategy to overwrite only if our value is newer than the high level
*/
export class OverwriteAgedDeleteStrategy<TKey, TValue>
extends AgingCacheWriteStrategy<TKey, TValue>
implements IAgingCacheDeleteStrategy<TKey, TValue>
{
delete(key: TKey, force: boolean): Promise<IAgingCacheWrite<TValue>> {
if (force) {
return this.executeDelete(key);
}
return this.deleteConditionally(key);
}
evict(key: TKey, evictAtLevel?: number, force?: boolean): Promise<IAgingCacheWrite<TValue>> {
Iif (force) {
return this.executeDelete(key, evictAtLevel);
}
return this.deleteConditionally(key, evictAtLevel);
}
private deleteConditionally(key: TKey, evictAtLevel?: number): Promise<IAgingCacheWrite<TValue>> {
return this.hierarchy.getValueAtTopLevel(key).then(highestAgedValue => {
if (!highestAgedValue) {
return this.executeDelete(key, evictAtLevel);
}
return this.hierarchy.getValueAtBottomLevel(key).then(lowestAgedValue => {
if (
lowestAgedValue &&
this.evictQueue.compare(lowestAgedValue.age, highestAgedValue.age) >= 0
) {
return this.executeDelete(key, evictAtLevel);
}
this.logger.debug(
`Delete deferred: key=${key},ageToSet=${
lowestAgedValue ? lowestAgedValue.age : 'null'
},ageFound=${highestAgedValue.age}`
);
return this.setFromHighestLevel(key, highestAgedValue);
});
});
}
}
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