server sent events httpclient java.net

The solution for “server sent events httpclient java.net” can be found here. The following code will assist you in solving the problem.

public class SseSubscriber implements BodySubscriber
{
protected static final Pattern dataLinePattern = Pattern.compile( “^data: ?(.*)$” );

protected static String extractMessageData( String[] messageLines )
{
var s = new StringBuilder( );
for ( var line : messageLines )
{
var m = dataLinePattern.matcher( line );
if ( m.matches( ) )
{
s.append( m.group( 1 ) );
}
}
return s.toString( );
}

protected final Consumer messageDataConsumer;
protected final CompletableFuture future;
protected volatile Subscription subscription;
protected volatile String deferredText;

public SseSubscriber( Consumer messageDataConsumer )
{
this.messageDataConsumer = messageDataConsumer;
this.future = new CompletableFuture<>( );
this.subscription = null;
this.deferredText = null;
}

@Override
public void onSubscribe( Subscription subscription )
{
this.subscription = subscription;
try
{
this.deferredText = “”;
this.subscription.request( 1 );
}
catch ( Exception e )
{
this.future.completeExceptionally( e );
this.subscription.cancel( );
}
}

@Override
public void onNext( List buffers )
{
try
{
// Volatile read
var deferredText = this.deferredText;

for ( var buffer : buffers )
{
// TODO: Safe to assume multi-byte chars don’t get split across buffers?
var s = deferredText + UTF_8.decode( buffer );

// -1 means don’t discard trailing empty tokens … so the final token will
// be whatever is left after the last \n\n (possibly the empty string, but
// not necessarily), which is the part we need to defer until the next loop
// iteration
var tokens = s.split( “\n\n”, -1 );

// Final token gets deferred, not processed here
for ( var i = 0; i < tokens.length - 1; i++ ) { var message = tokens[ i ]; var lines = message.split( "\n" ); var data = extractMessageData( lines ); this.messageDataConsumer.accept( data ); // TODO: Handle lines that start with "event:", "id:", "retry:" } // Defer the final token deferredText = tokens[ tokens.length - 1 ]; } // Volatile write this.deferredText = deferredText; this.subscription.request( 1 ); } catch ( Exception e ) { this.future.completeExceptionally( e ); this.subscription.cancel( ); } } @Override public void onError( Throwable e ) { this.future.completeExceptionally( e ); } @Override public void onComplete( ) { try { this.future.complete( null ); } catch ( Exception e ) { this.future.completeExceptionally( e ); } } @Override public CompletionStage getBody( )
{
return this.future;
}
}

Thank you for using DeclareCode; We hope you were able to resolve the issue.

More questions on [categories-list]

0
inline scripts encapsulated in