Update aiocache example to latest version

examples/cache_example.py

@@ -1,40 +1,61 @@
 """
-Example of caching using aiocache package. To run it you will need a Redis
+Example of caching using aiocache package. To run it you will need to install
-instance running in localhost:6379. You can also try with SimpleMemoryCache.
+aiocache with `pip install aiocache` plus a Redis instance running
+in localhost:6379
 
 Running this example you will see that the first call lasts 3 seconds and
-the rest are instant because the value is retrieved from the Redis.
+the rest are instant because the value is retrieved from Redis.
 
 If you want more info about the package check
 https://github.com/argaen/aiocache
 """
 
 import asyncio
-import aiocache
+import uuid
 
 from sanic import Sanic
 from sanic.response import json
 from sanic.log import log
-from aiocache import cached
+
-from aiocache.serializers import JsonSerializer
+from aiocache import caches, cached
+
 
 app = Sanic(__name__)
 
 
+config = {
+    "default": {
+        "cache": "aiocache.RedisCache",
+        "endpoint": "127.0.0.1",
+        "timeout": 2,
+        "namespace": "sanic",
+        "serializer": {
+            "class": "aiocache.serializers.JsonSerializer"
+        }
+    }
+}
+
+
 @app.listener('before_server_start')
 def init_cache(sanic, loop):
-    aiocache.settings.set_defaults(
+    caches.set_config(config)
-        class_="aiocache.RedisCache",
-        # class_="aiocache.SimpleMemoryCache",
-        loop=loop
-    )
 
 
-@cached(key="my_custom_key", serializer=JsonSerializer())
+# You can use alias or pass explicit args instead
+@cached(key="my_custom_key", ttl=30, alias="default")
 async def expensive_call():
     log.info("Expensive has been called")
     await asyncio.sleep(3)
-    return {"test": True}
+    # You are storing the whole dict under "my_custom_key"
+    return {"test": str(uuid.uuid4())}
+
+
+async def get_cache_value():
+    # This lazy loads a singleton so it will return the same instance every
+    # time. If you want to create a new instance, you can use
+    # `caches.create("default")`
+    cache = caches.get("default")
+    return await cache.get("my_custom_key")
 
 
 @app.route("/")
@@ -43,4 +64,10 @@ async def test(request):
     return json(await expensive_call())
 
 
+@app.route("/retrieve")
+async def test(request):
+    log.info("Received GET /retrieve")
+    return json(await get_cache_value())
+
+
 app.run(host="0.0.0.0", port=8000)