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Singleton class for RetroFit RestAdapter (Retrofit 1.9.0)
import retrofit.RestAdapter;
/**
* Singleton class for Retrofit RestAdapter and API (Retrofit 1.9.0)
*/
public class ApiManager {
// interface containing HTTP methods as given by Retrofit
private static RegionApi regionApi;
// static adapter to be used in entire app
static volatile RestAdapter restAdapter = null;
//dynamic endpoints if needed to change base url
private static DynamicEndPoint dynamicEndPoint;
private ApiManager() {
}
// singleton for RestAdapter
public static RestAdapter getAdapter() {
if (restAdapter == null) {
synchronized (ApiManager.class) {
if (restAdapter == null) {
dynamicEndPoint = new DynamicEndPoint("http://somebase url");
restAdapter = new RestAdapter.Builder().setEndpoint(dynamicEndPoint).setLogLevel(RestAdapter.LogLevel.FULL)
.build();
}
}
}
return restAdapter;
}
/**Method to get url used by DynamicEndPoint*/
public static String getBaseUrl() {
getAdapter();
return dynamicEndPoint.getUrl();
}
/**Method to set Base url for our endpoint*/
public static void setBaseUrl(String url) {
getAdapter();
synchronized (ApiManager.class) {
dynamicEndPoint.changeEndPoint(url);
}
}
/**Initializing Singleton for RegionApi*/
public static void initRegionApi() {
if (regionApi == null) {
synchronized (ApiManager.class) {
if (regionApi == null) {
regionApi = getAdapter().create(RegionApi.class);
}
}
}
}
/**Method to get RegionApi*/
public static RegionApi getRegionApi() {
initRegionApi();
return regionApi;
}
/**Method to get RegionApi with changed base url*/
public static RegionApi getRegionApi(String baseUrl) {
initRegionApi();
setBaseUrl(baseUrl);
return regionApi;
}
}
public class DynamicEndPoint implements Endpoint {
//http://stackoverflow.com/a/27816635/739306
//http://stackoverflow.com/a/23279628/739306
//Retrofit 1.9.0
String baseUrl;
public DynamicEndPoint(String baseUrl) {
this.baseUrl = baseUrl;
}
public void changeEndPoint(String baseUrl) {
this.baseUrl = baseUrl;
}
@Override
public String getUrl() {
return baseUrl;
}
@Override
public String getName() {
return "default";
}
}
import retrofit.Callback;
import retrofit.http.GET;
import retrofit.http.Path;
import retrofit.http.Query;
/**
* Retrofit 1.9.0
* Simple interface for HTTP methods exposed by Retrofit
*/
public interface RegionApi {
@GET("/regions")
public void fetchRegions(Callback<RegionList> callback);
}

ep372 commented Jun 27, 2016

Hi there!
Thank you for the nice example. It's fine for me :)
I have just a question :
Could you explain why you need volatile with the restAdapter property? Is it only because of the DynamicEndpoint which can be change across threads? May I omit it if do not use a dynamic endpoint ?
Thanks for your explanation
DDP

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