ExecutionPlanCache (arcadedb-engine 22.1.2 API)

java.lang.Object
- com.arcadedb.query.sql.parser.ExecutionPlanCache

```
public class ExecutionPlanCache
extends Object
```
This class is an LRU cache for already prepared SQL execution plans. It stores itself in the storage as a resource. It also acts an an entry point for the SQL executor.

Author:

Luigi Dell'Aquila (luigi.dellaquila-(at)-gmail.com)

Field Summary

Fields
Modifier and Type Field Description

protected long lastInvalidation

Constructor Summary

Constructors
Constructor Description

ExecutionPlanCache(DatabaseInternal db, int size)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`contains(String statement)`
`ExecutionPlan`	`get(String statement, CommandContext ctx)`	returns an already prepared SQL execution plan, taking it from the cache if it exists or creating a new one if it doesn't
`long`	`getLastInvalidation()`
`static ExecutionPlanCache`	`instance(DatabaseInternal db)`
`void`	`invalidate()`
`void`	`put(String statement, ExecutionPlan plan)`

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

Field Detail
- lastInvalidation
```
protected long lastInvalidation
```

Constructor Detail

ExecutionPlanCache

public ExecutionPlanCache(DatabaseInternal db,
                          int size)

Parameters:: size - the size of the cache

Method Detail

getLastInvalidation
```
public long getLastInvalidation()
```

contains
```
public boolean contains(String statement)
```
Parameters:

statement - an SQL statement

Returns:

true if the corresponding executor is present in the cache

get
```
public ExecutionPlan get(String statement,
                         CommandContext ctx)
```
returns an already prepared SQL execution plan, taking it from the cache if it exists or creating a new one if it doesn't

Parameters:

statement - the SQL statement

ctx -

Returns:

a statement executor from the cache

put

public void put(String statement,
                ExecutionPlan plan)

invalidate
```
public void invalidate()
```

instance

public static ExecutionPlanCache instance(DatabaseInternal db)