SpannerPool (Google Cloud Spanner 6.36.0 API)

java.lang.Object
- com.google.cloud.spanner.connection.SpannerPool

```
public class SpannerPool
extends Object
```
Pool for keeping track of Spanner instances needed for connections.
When a connection is opened for a Google Cloud Spanner database, a Spanner object can be opened in the background. The SpannerPool keeps track of which Spanner objects have been opened by connections during the lifetime of the JVM, which connections are still opened and closed, and which Spanner objects could be closed.
Call the method closeSpannerPool() at the end of your application to gracefully shutdown all instances in the pool.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`closeSpannerPool()`	Closes the default `SpannerPool` and all `Spanner` instances that have been opened by connections and that are still open.

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

- Method Detail
  - closeSpannerPool
```
public static void closeSpannerPool()
```
    Closes the default SpannerPool and all Spanner instances that have been opened by connections and that are still open. Call this method at the end of your application to gracefully close all Spanner instances in the pool. Failing to call this method will keep your application running for 60 seconds after you close the last Connection to Cloud Spanner, as this is the default timeout before the SpannerPool closes the unused Spanner instances.