Develop Reference

Filtering a Flux based upon the contents of the Flux, without blocking

Requirement: given the list of Servers in a Flux, return the LOCAL server if it is present, OR return the DEV servers if the LOCAL server is not present, and must be done in a non-blocking way.
I don't know how to do that with the Flux.filter method since it only allows you to examine one element at a time, and to perform that filtering you have to know what is in the whole list ahead of time. This was easy with blocking code as I simply iterated over the entire list ahead of time to determine if it had LOCAL or DEV instances, etc. Not sure how to do this with a Flux though.
Server Class:
class Server {
public String environment;
public String hostName;
public Server(String environment, String hostName) {
this.environment = environment;
this.hostName = hostName;
}
}
Filter Method:
public Flux<Server> filterServersLocalOrDev(Flux<Server> serverFlux) {
Flux<Server> filteredServers = // do filtering here..how to?
return filteredServers;
}
Demo calling code:
Server server1 = new Server("DEV", "dev1.somecompany.com");
Server server2 = new Server("TEST", "test1.somecompany.com");
Server server3 = new Server("DEV", "dev2.somecompany.com");
Server server4 = new Server("LOCAL", "localhost");
Flux<Server> serverFlux = Flux.just(server1, server2, server3, server4);
Flux<Server> filteredServerFlux = filterServersLocalOrDev(serverFlux);
// filteredServerFlux should only contain LOCAL if it is
// present OR the two DEV servers if there is no LOCAL

You can use filter and switchIfEmpty. It will return Local servers if present otherwise returns dev servers like this
public Flux<Server> filterServersLocalOrDev(Flux<Server> serverFlux) {
Flux<Server> filteredServers = serverFlux
.filter(s -> "LOCAL".equals(s.environment))
.switchIfEmpty(serverFlux.filter(s -> "DEV".equals(s.environment)));
return filteredServers;
}

How to set up default browser that jdk/jre uses

I used code of programm that you can see below.The logic of class is to get some properties from html code from YouTube page.For long time it worked fine, but now not. The reason of problem is the next: jdk/jre uses Internet explorer as default browser and now YouTube not support ie (It returns the page with suggestion of updating browser).
The question is : how to change default browser taht java uses?
I switched the default browser of the system to Chrome and default browser of Intellij IDE to Chrome too, but it didn't give any result to me.
#Component(immediate = true, service = LastActualVideoService.class)
public class LastActualVideoServiceServiceImpl implements LastActualVideoService {
private final Logger logger = LoggerFactory.getLogger(getClass());
private static final String LINK_TO_YOU_TUBE = "https://www.youtube.com/embed/";
private static final String TRIGGER_FOR_VIDEO = "/watch?v=";
private static final String VIDEO_SELECTOR = "/videos";
private static final String HTML_SEPARATOR = "\\A";
private static final String ERROR_MASSAGE = "Incorrect input URL";
private static final String OPEN_TITLE_TAG = "<title>";
private static final String CLOSE_TITLE_TAG = "</title>";
#Override
public YouTubeChannelInfo getVideoBlob(String channelURL) {
channelURL = channelURL.concat(VIDEO_SELECTOR);
try (InputStream response = new URL(channelURL).openStream()) {
Scanner scanner = new Scanner(response);
String responseBody = scanner.useDelimiter(HTML_SEPARATOR).next();
String uniqueVideo = responseBody.substring(responseBody.indexOf(TRIGGER_FOR_VIDEO), responseBody.indexOf(TRIGGER_FOR_VIDEO) + 20);
String title = responseBody.substring(responseBody.indexOf(OPEN_TITLE_TAG) + 7, responseBody.indexOf(CLOSE_TITLE_TAG));
String linkToVideo = LINK_TO_YOU_TUBE.concat(uniqueVideo.substring(uniqueVideo.lastIndexOf('=') + 1));
return new YouTubeChannelInfo(linkToVideo, title, channelURL);
} catch (IOException e) {
logger.error(ERROR_MASSAGE, e);
return null;
}
}
}

URL.openStream does not "use the browser", your Java program acts as HTTP client itself. The way the remote server can know what type of browser is connecting is the user agent that the client sends with the request. It's possible that Youtube does not recognize or like whatever the default is.
Like Joachim Rohde commented, the solution is to manually set the user agent to something Youtube will recognize as supported.

Does Protocol.registerProtocol for apache HttpClient cause a global static change?

I've come across some code that's using
Protocol.registerProtocol
in an attempt to block some TLS ciphers for a request, and retry the request with it re-enabled at times, depending on other factors.
But is Protocol.registerProtocol causing a global change - ie will other threads be affected by this?
Here's the code in question:
protected static HostConfiguration buildTLSConfig(String uri, HostConfiguration config,
boolean blockTLS1)
throws MalformedURLException
{
scheme = "https";
if (baseHttps == null)
{
baseHttps = Protocol.getProtocol(scheme);
baseFactory = baseHttps.getSocketFactory();
}
URL newUrl = new URL(uri);
defaultPort = baseHttps.getDefaultPort();
if (blockTLS1)
{
ProtocolSocketFactory customFactory =
new CustomHttpsSocketFactory(baseFactory, TLS_PREFERRED_PROTOCOLS);
Protocol applyHttps = new Protocol(scheme, customFactory, defaultPort);
Protocol.registerProtocol(scheme, applyHttps);
config.setHost(newUrl.getHost(), defaultPort, applyHttps);
}
else
{
Protocol.registerProtocol(scheme, baseHttps);
config.setHost(newUrl.getHost(), defaultPort, baseHttps);
}
return config;
}

Yes, all threads will be affected by the change.
If we look at org.apache.commons.httpclient.protocol.Protocol, we see a global protocol Map:
/** The available protocols */
private static final Map PROTOCOLS = Collections.synchronizedMap(new HashMap());
And registerProtocol() simply modifying it:
public static void registerProtocol(String id, Protocol protocol) {
// . . .
PROTOCOLS.put(id, protocol);
}
At least it's synchronized, so there won't be a race during modification.

How can I hijack an opened browser session and attach it to the Webdriver than opening a browser by itself

When using Selenium webDriver, I always have to initiate the driver and open a browser, navigate all the way through the flow to validate something, and if it failed throwing an exception, has to do the same spending lot of time.
Always thought of keeping another browser session opened, and let webdriver attached to the opened session and work on it, so the need to go through the flow could be eliminated.
Does any one knows how to do this in Selenium Webdriver, using Java?
Thanks

I've tried this. It works for me.
public class xRemoteWebDriver : RemoteWebDriver
{
public static bool newSession;
public static string capPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "TestFiles", "tmp", "sessionCap");
public static string sessiodIdPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "TestFiles", "tmp", "sessionid");
public xRemoteWebDriver(Uri remoteAddress)
: base(remoteAddress, new DesiredCapabilities())
{
}
protected override Response Execute(DriverCommand driverCommandToExecute, Dictionary<string, object> parameters)
{
if (driverCommandToExecute == DriverCommand.NewSession)
{
if (!newSession)
{
var capText = File.ReadAllText(capPath);
var sidText = File.ReadAllText(sessiodIdPath);
var cap = JsonConvert.DeserializeObject<Dictionary<string, object>>(capText);
return new Response
{
SessionId = sidText,
Value = cap
};
}
else
{
var response = base.Execute(driverCommandToExecute, parameters);
var dictionary = (Dictionary<string, object>) response.Value;
File.WriteAllText(capPath, JsonConvert.SerializeObject(dictionary));
File.WriteAllText(sessiodIdPath, response.SessionId);
return response;
}
}
else
{
var response = base.Execute(driverCommandToExecute, parameters);
return response;
}
}
}
Hope it helps.

string escaping with non-nullable named parameters

I am trying to use the google cloud endpoints Java from android as such:
client:
Core.Builder coreBuilder = new Core.Builder(
AndroidHttp.newCompatibleTransport(), new GsonFactory(), null);
coreBuilder.setApplicationName("myapp");
if (MainActivity.ENDPOINTS_URL != null) {
coreBuilder.setRootUrl(MainActivity.ENDPOINTS_URL);
coreBuilder.setGoogleClientRequestInitializer(new GoogleClientRequestInitializer() {
public void initialize(AbstractGoogleClientRequest<?> request)
throws IOException {
request.setDisableGZipContent(true);
}
});
}
Core core = coreBuilder.build();
myList = core.asdf("x=&+x", myObject);
server:
#ApiMethod(name = "asdf")
public List<String> asdf(#Named("param1") String param1, MyObject myObject) {
if (param1.equals("x=&+x")) {
//should go here, but never does
}
...
While it mostly works, somehow the param1 string does not get correctly transmitted, meaning that "x=&+x" arrives at the server as "x=&%2Bx". Is this a known bug? Or do arguments have to be manually encoded somehow? Or is this somehow particular to my environment?
Appengine SDK V1.8.8 for java, google api 1.17.0-rc, using the dev environment.
Cheers,
Andres