Created
August 14, 2021 12:41
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Fallback example
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import okhttp3.OkHttpClient; | |
import okhttp3.Request; | |
import java.io.IOException; | |
import java.time.Duration; | |
import java.util.ArrayList; | |
import java.util.List; | |
import java.util.Optional; | |
public class FallBackExample { | |
private static final List<List<String>> listOfUrls = List.of( | |
List.of("http://www.invalidurl.com", "http://www.invalidurl.com", "http://www.google.com"), | |
List.of("http://www.invalidurl.com", "http://www.yahoo.com", "http://www.bb2.com"), | |
List.of("http://www.google.com", "http://www.invalidurl.com", "http://www.invalidurl.com"), | |
List.of("http://www.invalidurl.com", "http://www.invalidurl.com", "http://www.bbc.com"), | |
List.of("http://www.invalidurl.com", "http://www.cnn.com", "http://www.invalidurl.com"), | |
List.of("http://www.cnbc.com", "http://www.invalidurl.com", "http://www.invalidurl.com"), | |
List.of("http://www.invalidurl.com", "http://www.invalidurl.com", "http://www.dw.com"), | |
List.of("http://www.invalidurl.com", "http://www.youtube.com", "http://www.invalidurl.com"), | |
List.of("http://www.toi.com", "http://www.invalidurl.com", "http://www.invalidurl.com")); | |
private static List<String> getValidFallbackUrls(List<List<String>> listOfUrls) { | |
List<String> urlList = new ArrayList<>(); | |
listOfUrls.parallelStream().forEach(listOfUrl -> getOutPut(listOfUrl.get(0)).ifPresentOrElse(urlList::add, | |
() -> getOutPut(listOfUrl.get(1)).ifPresentOrElse(urlList::add, | |
() -> getOutPut(listOfUrl.get(2)).ifPresent(urlList::add)))); | |
return urlList; | |
} | |
private static Optional<String> getOutPut(String url) { | |
OkHttpClient client = new OkHttpClient().newBuilder() | |
.connectTimeout(Duration.ofSeconds(5)) | |
.readTimeout(Duration.ofSeconds(5)) | |
.writeTimeout(Duration.ofSeconds(5)) | |
.build(); | |
Request request = new Request.Builder() | |
.url(url) | |
.method("GET", null) | |
.build(); | |
try { | |
client.newCall(request).execute(); | |
Thread.currentThread().interrupt(); | |
return Optional.of(url); | |
} catch (IOException e) { | |
return Optional.empty(); | |
} | |
} | |
public static void main(String[] args) { | |
final var validFallbackUrls = getValidFallbackUrls(listOfUrls); | |
validFallbackUrls.forEach(System.out::println); | |
} | |
} |
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