Kikaha GZip Module

GZipModule.java

import io.undertow.Undertow;
import io.undertow.server.handlers.encoding.EncodingHandler;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import javax.inject.Singleton;
import kikaha.core.modules.Module;

/**
 * Compresses all responses sent to the http client (usually the browser)
 * using GZip algorithm. It will reduce the amount of data being sent out
 * from our servers, improving uses experience and also lowering the
 * bandwidth cost in our infrastructure.
 *
 * It worth notice though it may come with a CPU penalty as a trade off,
 * once all requests will its response compressed and the compression is
 * a CPU bound operation.
 */
@Singleton
public class GZipModule implements Module {
  
  /**
   * This will force the module to be execute at the same level as
   * the CORS one. This is strategically useful, so we can guarantee
   * that it will be a top level module (one of the first one being
   * called).
   */
  public String getName(){
    return "cors";
  }
  
  /**
   * This module will make EncodingHandler the root HttpHandler to be executed
   * once a request is received by Undertow.
   */
  public void load( Undertow.Builder server, DeploymentContext context ) throws IOException {
    val rootHandler = context.rootHandler();
    val encodingHandler = new EncodingHandler.Builder().build(null).wrap(rootHandler);
    context.rootHandler(encodingHandler);
  }
}