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s61200
broken-petclinic
Commits
22ff3985
Commit
22ff3985
authored
6 years ago
by
Jens Wilke
Committed by
Stephane Nicoll
6 years ago
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Clarify cache configuration
See gh-335
parent
645ebc4f
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src/main/java/org/springframework/samples/petclinic/system/CacheConfiguration.java
+35
-2
35 additions, 2 deletions
...ramework/samples/petclinic/system/CacheConfiguration.java
with
35 additions
and
2 deletions
src/main/java/org/springframework/samples/petclinic/system/CacheConfiguration.java
+
35
−
2
View file @
22ff3985
...
...
@@ -7,10 +7,38 @@ import org.springframework.cache.annotation.EnableCaching;
import
org.springframework.context.annotation.Bean
;
import
org.springframework.context.annotation.Configuration
;
/**
* Cache configuration intended for caches providing the JCache API. This configuration
* creates the used cache for the application and enables statistics that
* become accessible via JMX.
*
* <p>This is a minimal configuration that makes use of the JCache API to enable
* caching with any JCache implementation out of the box. The utilized JCache implementation
* is specified by the dependency in the {@code pom.xml}.
*
* <p>If the used cache implementation is configured via its specific and non standard mechanism,
* this example configuration might be redundant and can be removed or replaced by
* a programmatic configuration via the implementation specific methods.
*
* <p>In case no programmatic cache configuration is needed for the selected caching
* implementation this configuration class can be removed and the {@link EnableCaching}
* annotation can be put on the application class.
*
* @author Jens Wilke
*/
@Configuration
@EnableCaching
class
CacheConfiguration
{
/**
* A customizer that creates the the cache used by the application.
* This implies that the cache is not existent before the application start and the
* cache must be created. This is the default behavior of a JCache implemenation, in case
* no additional configuration is present and typically will create a transient in memory cache.
* If a persistent cache implementation is used, creating the cache on startup
* may lead to a failure, when the cache was created before. If the cache life time
* is controlled separately, the call of {@code createCache} must be removed.
*/
@Bean
public
JCacheManagerCustomizer
petclinicCacheConfigurationCustomizer
()
{
return
cm
->
{
...
...
@@ -18,9 +46,14 @@ class CacheConfiguration {
};
}
/**
* Enable statistics via the JCache programmatic configuration API.
* Within the configuration object that is provided by the JCache API standard, there is only
* a very limited set of configuration options. The really relevant configuration options
* (like the size limit) must be set via a configuration mechanism that is provided by the
* selected JCache implementation.
*/
private
javax
.
cache
.
configuration
.
Configuration
<
Object
,
Object
>
cacheConfiguration
()
{
// Create a cache using infinite heap. A real application will want to use a more fine-grained configuration,
// possibly using an implementation-dependent API
return
new
MutableConfiguration
<>().
setStatisticsEnabled
(
true
);
}
...
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