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Example code of craftcms/yii2-cache-cascade

Informations about the package yii2-cache-cascade

Yii2 Cache Cascade

A Yii2 cache component that cascades through multiple cache drivers on failure, preventing app downtime due to cache outages.

Note: This is not a multi-store/write-through cache. Only one cache component is used at a time. This makes the most sense when using a fast, in-memory cache like ArrayCache as a fallback, to prevent your application from crashing while the primary cache (e.g., Redis) is unavailable or restabilizing.

Installation

Usage

Configure the cache component in your Yii2 application config:

Configuration

caches

An array of cache components in priority order. Each element can be:

cooldownDuration

The number of seconds a failed cache should be skipped before it is retried. Defaults to 0.

The default retries failed caches on every operation, which matches the original operation-based cascade behavior. For normal web requests, setting this at or above the expected request duration effectively makes failover request-based because the failed cache will not be retried again during that request.

Events

The component triggers a CascadeCache::EVENT_CACHE_FAILED event when a cache operation fails (shown in the usage example above). Use this for custom logging, monitoring, or to control cascade behavior.

CacheFailedEvent Properties

Property Type Description
$cache CacheInterface The cache that failed
$operation string The operation that failed ('get', 'set', etc.)
$exception \Throwable The exception that was thrown
$shouldCascade bool Whether to cascade to the next cache (default: true)

License

MIT

All versions of yii2-cache-cascade with dependencies

PHP Build Version
Package Version
Requires php Version >=7.4
yiisoft/yii2 Version ^2.0.45
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