QueryStrategyCache (src/fs/client/mapr-ojai-driver 6.0.0.rc1-mapr API)

```
public class QueryStrategyCache
extends java.lang.Object
```
A cache for query execution strategies. OJAI will execute some queries directly rather than passing them to Drill. The analysis for determining whether or not something should be sent to Drill could be expensive. As a result, once we've determined how a query should be executed, we will cache that. (However, note that we might still send a query to Drill if we determine that the amount of data we're going to scan is large, and we want Drill to parallelize it. Strategies allow for this fallback action.) We expect the analysis to be time-consuming, relative to the time required to do the queries; since we are trying to optimize for operational queries, we want to reduce that as much as possible. Hence the strategy cache.

Nested Classes
Modifier and Type	Class and Description
`static class`	`QueryStrategyCache.Mapping` A Mapping represents a current use of a cache entry, keeping that entry alive for the duration of its use.
`static interface`	`QueryStrategyCache.StrategyLoader` Users of the cache provide an implementation of this interface in order to load cache items.

Constructors
Constructor and Description
`QueryStrategyCache(int sizeLimit, QueryStrategyCache.StrategyLoader itemManager)` Constructor.

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`QueryStrategyCache.Mapping`	`get(OjaiQuery query)` Look in the cache for a entry for the given query.
`java.util.Set<OjaiQuery>`	`getCached()` Returns the set of queries whose QueryStrategys are currently in the cache.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Class QueryStrategyCache