How to use the micawber.cache.Cache function in micawber

# Create a Flask WSGI app and configure it using values from the module.
app = Flask(__name__)
app.config.from_object(__name__)

# FlaskDB is a wrapper for a peewee database that sets up pre/post-request
# hooks for managing database connections.
flask_db = FlaskDB(app)

# The `database` is the actual peewee database, as opposed to flask_db which is
# the wrapper.
database = flask_db.database

# Configure micawber with the default OEmbed providers (YouTube, Flickr, etc).
# We'll use a simple in-memory cache so that multiple requests for the same
# video don't require multiple network requests.
oembed_providers = bootstrap_basic(OEmbedCache())


class Entry(flask_db.Model):
    title = CharField()
    slug = CharField(unique=True)
    content = TextField()
    published = BooleanField(index=True)
    timestamp = DateTimeField(default=datetime.datetime.now, index=True)

    @property
    def html_content(self):
        """
        Generate HTML representation of the markdown-formatted blog entry,
        and also convert any media URLs into rich media objects such as video
        players or images.
        """

from datetime import datetime
from json import loads

import peewee
from peewee_async import Manager
from markdown import markdown
from micawber import bootstrap_basic, parse_html
from micawber.cache import Cache as OEmbedCache

# Configure micawber with the default OEmbed providers (YouTube, Flickr, etc).
# We'll use a simple in-memory cache so that multiple requests for the same
# video don't require multiple network requests.
from slugify import slugify

oembed_providers = bootstrap_basic(OEmbedCache())


def make_models(db, db_name, loop):
    class Entry(peewee.Model):
        title = peewee.CharField(default='')
        slug = peewee.CharField(unique=True)
        content = peewee.TextField(default='')
        is_published = peewee.BooleanField(default=False, index=True)
        created = peewee.DateTimeField(default=datetime.now, index=True)
        raw_meta = peewee.TextField(default='')

        @staticmethod
        def slugify(text):
            return slugify(text.lower())

        @property

self._cache = self.load()
    
    def load(self):
        if os.path.exists(self.filename):
            with closing(open(self.filename)) as fh:
                contents = fh.read()
            return pickle.loads(contents)
        return {}

    def save(self):
        with closing(open(self.filename, 'w')) as fh:
            fh.write(pickle.dumps(self._cache))


if Redis:
    class RedisCache(Cache):
        def __init__(self, namespace='micawber', **conn):
            self.namespace = namespace
            self.key_fn = lambda self, k: '%s.%s' % (self.namespace, k)
            self.conn = Redis(**conn)
        
        def get(self, k):
            cached = self.conn.get(self.key_fn(k))
            if cached:
                return pickle.loads(cached)
        
        def set(self, k, v):
            self.conn.set(self.key_fn(k), pickle.dumps(v))

except ImportError:
    Redis = None


class Cache(object):
    def __init__(self):
        self._cache = {}

    def get(self, k):
        return self._cache.get(k)

    def set(self, k, v):
        self._cache[k] = v


class PickleCache(Cache):
    def __init__(self, filename='cache.db'):
        self.filename = filename
        self._cache = self.load()
    
    def load(self):
        if os.path.exists(self.filename):
            with closing(open(self.filename)) as fh:
                contents = fh.read()
            return pickle.loads(contents)
        return {}

    def save(self):
        with closing(open(self.filename, 'w')) as fh:
            fh.write(pickle.dumps(self._cache))