How to cache like a boss

ŽELJKO PLESAC

NOT ALL DATA IS EQUAL.

NOT ALL CACHING MECHANISMS ARE EQUAL.

EACH CACHING MECHANISM IS SUITABLE FOR ONLY ONE PART OF YOUR APP DATA.

CACHING IS SLOW.

Response caching with OkHttp

Session object

LruCache

DiskLruCache

Preferences

Database

CACHING MECHANISMS

Cache network responses on OkHttp client.

Custom cache size and cache time validity.

No support for data caching, which is created in your app.

OKHTTP RESPONSE CACHING

private static final Interceptor cacheControlInterceptor = new Interceptor() { @Override public Response intercept(Chain chain) throws IOException { Request request = chain.request(); Response response = chain.proceed(request); if (shouldCacheResponse(request)) { // Re-write response CC header to force use of cache return response.newBuilder() .header("Cache-Control", "public, max-age=3600") // 1 hour .build(); } else { return response; } }};

Simple POJO object which is used for data storage.

Singleton, provided by AppComponent.

Can have shorter lifecycle than app lifecycle.

Used for storing sensitive user data.

SESSION OBJECT

If you need to store it, the data should be encrypted.

SESSION OBJECT

Memory cache which holds strong references to a limited

number of values.

It has a limited space requirement.

Deleted on app restart.

LRU CACHE

Each time a valued is accessed, it is moved to the head of the

queue.

When a value is put into the cache, the value at the end of the

list may be evicted.

LRU CACHE - HOW IT WORKS

Similar to LruCache, but the data is stored in a directory on a

filesystem.

Use Jake Wharton’s implementation.

DISK LRU CACHE

For storing primitive data in key-value pairs.

Can be private or shared.

Stored on filesystem.

PREFERENCES

Native support for relational databases (SQLite).

Support for NoSQL databases by 3rd party libraries (Realm,

Firebase, CouchBaseLite)

DATABASES

Full database support • transactions • database schemas • CRUD actions • migrations • can be copied, deleted, exported

DATABASES

Thank you!

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