jribble

### Keybase proof

I hereby claim:

  * I am jribble on github.
  * I am jribble (https://keybase.io/jribble) on keybase.
  * I have a public key ASDm2pv8CHB0RRGC80sWswv3Jf8iAR4YsTVNt-_y1b5jrQo

To claim this, I am signing this object:

jribble

// async lock using promise
// this queues all calls
var pending = Q.when(true);
function callToServer() {
  pending = pending.then(function() {
    return callService("myService", params);
  });
}

// async avoid double call using flag

jribble

package pdfutil;

import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;