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Forked from polbins/README.md
Created April 28, 2016 11:54
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Android Response Caching using Retrofit 1.9 + OkHttp 2.2

Android REST Controller with Cache-Control

Android REST Controller with Simple Cache Control Headers using Retrofit 1.9.0 + OkHttp 2.2.0

public abstract class RestController {
private static Context mContext;
private static long SIZE_OF_CACHE = 10 * 1024 * 1024; // 10 MB
protected static RestAdapter mRestAdapter;
public static void init(final Context context, String baseAPIUrl) {
mContext = context;
// Create Cache
Cache cache = null;
try {
cache = new Cache(new File(mContext.getCacheDir(), "http"), SIZE_OF_CACHE);
} catch (IOException e) {
Log.e(RestController.class.getSimpleName(), "Could not create Cache!", e);
}
// Create OkHttpClient
OkHttpClient okHttpClient = new OkHttpClient();
okHttpClient.setCache(cache);
okHttpClient.setConnectTimeout(30, TimeUnit.SECONDS);
okHttpClient.setReadTimeout(30, TimeUnit.SECONDS);
// Add Cache-Control Interceptor
okHttpClient.networkInterceptors().add(mCacheControlInterceptor);
// Create Executor
Executor executor = Executors.newCachedThreadPool();
mRestAdapter = new RestAdapter.Builder()
.setEndpoint(baseAPIUrl)
.setExecutors(executor, executor)
.setClient(new OkClient(okHttpClient))
.setLogLevel(RestAdapter.LogLevel.FULL)
.build();
}
private static final Interceptor mCacheControlInterceptor = new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
// Add Cache Control only for GET methods
if (request.method().equals("GET")) {
if (ConnectivityHelper.isNetworkAvailable(mContext)) {
// 1 day
request.newBuilder()
.header("Cache-Control", "only-if-cached")
.build();
} else {
// 4 weeks stale
request.newBuilder()
.header("Cache-Control", "public, max-stale=2419200")
.build();
}
}
Response response = chain.proceed(request);
// Re-write response CC header to force use of cache
return response.newBuilder()
.header("Cache-Control", "public, max-age=86400") // 1 day
.build();
}
};
}
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