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msd/vendor/desarrolla2/cache/docs/implementations/chain.md

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+# Chain
+
+The Cache chain allows you to use multiple implementations to store cache. For
+instance, you can use both fast volatile (in-memory) storage and slower
+non-volatile (disk) storage. Alternatively you can have a local storage
+as well as a shared storage service. 
+
+``` php
+use Desarrolla2\Cache\Chain as CacheChain;
+use Desarrolla2\Cache\Memory as MemoryCache;
+use Desarrolla2\Cache\Predis as PredisCache;
+
+$cache = new CacheChain([
+    (new MemoryCache())->withOption('ttl', 3600),
+    (new PredisCache())->withOption('ttl', 10800)
+]);
+```
+
+The Chain cache implementation doesn't use any option. It uses the `Nop` packer
+by default.
+
+Typically it's useful to specify a maximum `ttl` for each implementation. This
+means that the volatile memory only holds items that are used often.
+
+The following actions propogate to all cache adapters in the chain
+
+* `set`
+* `setMultiple`
+* `delete`
+* `deleteMultiple`
+* `clear`
+
+For the following actions all nodes are tried in sequence
+
+* `has`
+* `get`
+* `getMultiple`