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Clarification around cache expiry when using StorageManager #387

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Jul 18, 2022
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Clarification around cache expiry when using StorageManager #387

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12 changes: 12 additions & 0 deletions docs/modules/cache/pages/configuration/storage.adoc
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Expand Up @@ -48,6 +48,18 @@ storage.storage-directory = ~/cache-data
storage.channel-count = 4
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== Cache expiry and StorageManager

Since the validity of a Cache entry is only determined when the value is retrieved, the expiry durations are not always respected when using the `StorageManager` when the application is restarted. An example makes this clear.

Suppose we have defined a cache where the https://github.com/jsr107/jsr107spec/blob/master/src/main/java/javax/cache/expiry/ExpiryPolicy.java[ExpiryPolicy] is set to 1 Minute.

When we create an entry in this cache and we did not request the cache entry after the 1-minute expiry before we do shut down the application.

When we start up the application again, When we request the cache entry, it is loaded from the MicroStream Storage Manager and 'created' with a new expiry of 1 minute.

This means that even if the entry was already created more than 1 minute ago (even when we only take into consideration the application uptime), the entry is still returned to the calling code.

== Spring example

[source, text, title="application.properties"]
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