added InMemory example

examples/in_memory/main.py

@@ -0,0 +1,53 @@
+from datetime import date, datetime
+
+import uvicorn
+from fastapi import FastAPI
+from starlette.requests import Request
+from starlette.responses import Response
+
+from fastapi_cache import FastAPICache
+from fastapi_cache.backends.inmemory import InMemoryBackend
+from fastapi_cache.decorator import cache
+
+app = FastAPI()
+
+ret = 0
+
+
+@cache(namespace="test", expire=1)
+async def get_ret():
+    global ret
+    ret = ret + 1
+    return ret
+
+
+@app.get("/")
+@cache(namespace="test", expire=20)
+async def index(request: Request, response: Response):
+    return dict(ret=await get_ret())
+
+
+@app.get("/clear")
+async def clear():
+    return await FastAPICache.clear(namespace="test")
+
+
+@app.get("/date")
+@cache(namespace="test", expire=20)
+async def get_data(request: Request, response: Response):
+    return date.today()
+
+
+@app.get("/datetime")
+@cache(namespace="test", expire=20)
+async def get_datetime(request: Request, response: Response):
+    return datetime.now()
+
+
+@app.on_event("startup")
+async def startup():
+    FastAPICache.init(InMemoryBackend())
+
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", debug=True, reload=True)