OAuth 1.0a with Signport on Volley including support for multiple operations and volleys multithreading

OAuthStack.java

/*
 ** ------------------------------------------------------------------------------
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 ** ------------------------------------------------------------------------------
 */
package nl.sogeti.android.deviceprofiler.network;

import android.support.v4.util.LongSparseArray;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.toolbox.HurlStack;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;

import oauth.signpost.OAuthConsumer;
import oauth.signpost.exception.OAuthException;

/**
 * @author (c) 2015, René de Groot available under Apache License Version 2.0
 */
public class OAuthStack extends HurlStack
{
   private final OAuthConsumer consumer;
   private LongSparseArray<String> methods = new LongSparseArray<>();

   public OAuthStack(OAuthConsumer consumer)
   {
      this.consumer = consumer;
   }

   @Override
   public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders)
         throws IOException, AuthFailureError
   {
      String method;
      switch (request.getMethod())
      {
         case Request.Method.DEPRECATED_GET_OR_POST:
         case Request.Method.POST:
            method = HttpPost.METHOD_NAME;
            break;
         case Request.Method.PUT:
            method = HttpPut.METHOD_NAME;
            break;
         case Request.Method.DELETE:
            method = HttpDelete.METHOD_NAME;
            break;
         case Request.Method.GET:
            method = HttpGet.METHOD_NAME;
            break;
         default:
            throw new IllegalStateException("Unknown method type.");
      }
      methods.put(Thread.currentThread().getId(), method);
      return super.performRequest(request, additionalHeaders);
   }

   @Override
   protected HttpURLConnection createConnection(URL url) throws IOException
   {
      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
      try
      {

         final long threadId = Thread.currentThread().getId();
         String method = methods.get(threadId);
         if (method != null)
         {
            connection.setRequestMethod(method);
            // Could be faster by have a single consumer instance per thread and no synchronized
            synchronized (consumer)
            {
               consumer.sign(connection);
            }
            methods.remove(threadId);
         }
      }
      catch (OAuthException e)
      {
         throw new IOException("Failed to OAuth sign this Volley connection", e);
      }
      return connection;
   }
}