Develop Reference

mongodb javascript queries

currently I'm working on a project in Java, and I need to run the JavaScript Mongo queries using Java. I figured out I can do something like that using db.eval(). Problem is I have the following JavaScript query for Mongo and I have no idea how can I pass the whole script to the db.eval() method.
var red = function(doc, out) {
out.count_order++;
out.sum_qty += doc.quantity;
out.sum_base_price += doc.extendedprice;
out.sum_disc_price += doc.extendedprice * (1 - doc.discount);
out.sum_charge += doc.extendedprice * (1 - doc.discount) * (1 + doc.tax);
out.avg_disc += doc.discount
};
var avg = function(out) {
out.avg_qty = out.sum_qty / out.count_order;
out.avg_price = out.sum_base_price / out.count_order;
out.avg_disc = out.avg_disc / out.count_order
};
db.deals.group( {
key : { RETURNFLAG : true, LINESTATUS : true},
cond : { "SHIPDATE" : {$lte: new Date(1998, 8, 1)}},
initial: { count_order : 0, sum_qty : 0, sum_base_price : 0, sum_disc_price : 0,
sum_charge : 0, avg_disc : 0},
reduce : red,
finalize : avg
});

I encourage you to look at the mongodb java driver to run queries from Java. The Java driver allows one to interact with their mongodb database directly in Java. Thus, you can just port this code to Java and do it all in Java, avoiding ever having to use javascript or db.eval. Let me know if you would like more clarification.

you can also use stored procedures in which you can call the stored functions from the java-driver using eval()
Some details : http://dirolf.com/2010/04/05/stored-javascript-in-mongodb-and-pymongo.html
Recently in v2.4 there were some concurrency improvements for javascript operations : http://docs.mongodb.org/manual/release-notes/2.4-javascript/

Relative time for views in Play Framework 2.1

It seems like the Play Framework used(?) to have a since() function to get relative time (like "4 minutes ago") in views for Play 1.x. This is mentioned as a Date Extension here
However in Play 2.1 this doesn't appear to work anymore. I get value since is not a member of java.util.Date ... Additionally I can't find any other references to since() (in the context of Play 2.1) online.
Is there a proper/default way of handling this common case? I feel like I must be missing something important since this seems to no longer be supported?
Thanks!

The since() method is unavailable since beginning of the 2.0 branch.
Not a direct answer, but if it's possible I'd suggest to use JavaScript plugin for this task for an example: timeago jQuery plugin reasons:
It doesn't require calculating it in the controller
You can cache your site (for an example in the memory) for long time, and since time will be still displayed correctly as it's updated on the client-side.
It auto updates even without page refresh (like here, on the Stack Overflow)

#Jack suggested a pretty good answer.
Here is a version of his code that might be useful because it'll enable some composition if needed (the check function is not composing but could be easily changed to compose and show a more detailed since value)
package object pimps {
import java.util.Date
import org.joda.time.DateTime;
import org.joda.time.Period;
def step(f:Period => Int)(fi:String):Period => Option[String] = {
def g(i:Int = 1) = i + " " + fi + (if (i==1) "" else "s") + " ago"
(p:Period) => {
f(p) match {
case 0 => None
case 1 => Some(g())
case x => Some(g(x))
}
}
}
val yearsStep = step(_.getYears)("year")
val monthsStep = step(_.getMonths)("month")
val daysStep = step(_.getDays)("day")
val hoursStep = step(_.getHours)("hour")
val minutesStep = step(_.getMinutes)("minute")
val secondsStep = step(_.getSeconds)("second")
val steps = Seq(yearsStep, monthsStep, daysStep, hoursStep, minutesStep, secondsStep)
val check =
(p:Period) =>
steps.collectFirst {
case f if f(p).isDefined => f(p).get
}
implicit class PimpedDate(col: Date) {
def since() = {
val period: Period = new Period(new DateTime(col), DateTime.now);
check(period)
}
}
}
As you can see, for now we stop at the first matching level, and also we repeat the getter (getYears if matching will be called twice).
Nevertheless, another thing to note is the usage of implicit class which has been introduced in Scala 2.10 to ease the pimping

As far as I can tell this isn't possible to do any more (by default in Play2.1). Please correct me if I am wrong. Here's how I recreated it. As mentioned here I "pimped" the "Date" class:
// File app/views/pimps.scala
package views
package object pimps {
import java.util.Date
import org.joda.time.DateTime;
import org.joda.time.Period;
class PimpedDate(col: Date) {
def since() = {
def addS(b: Int) = if (b == 1) "" else "s"
val now: DateTime = new DateTime();
val period: Period = new Period(new DateTime(col), now);
var r: String = "";
if (period.getYears() > 0) {
r = period.getYears() + " year" + addS(period.getYears()) + " ago";
} else if (period.getWeeks() > 0) {
r = period.getWeeks() + " week" + addS(period.getWeeks()) + " ago";
} else if (period.getMonths() > 0) {
r = period.getMonths() + " month" + addS(period.getMonths()) + " ago";
} else if (period.getDays() > 0) {
r = period.getDays() + " day" + addS(period.getDays()) + " ago";
} else if (period.getHours() > 0) {
r = period.getHours() + " hour" + addS(period.getHours()) + " ago";
} else if (period.getMinutes() > 0) {
r = period.getMinutes() + " minute" + addS(period.getMinutes()) + " ago";
} else {
r = period.getSeconds() + " second" + addS(period.getSeconds()) + " ago";
}
r
}
}
implicit def pimpDate(col: Date) = new PimpedDate(col)
}
Then in my view I can just import the above:
#import views.pimps._
and then use since() just as you could in Play1
<td>#record.created_on.since()</td>
Please comment/answer if there's a better way to do this or write the scala code...

Design generic process using template pattern

I have a routine that I repeatedly doing for many projects and I want to generalized it. I used iText for PDF manipulation.
Let say that I have 2000 PDFs inside a folder, and I need to zip these together. Let say the limit is 1000 PDFs per zip. So the name of the zip would follow this rule: job name + job sequence. For example, the zip name of the first 1000 PDF would be XNKXMN + AA and the second zip name would be XNKXMN + AB. Before zipping these PDFs, I need to add some text to each PDF. Text look something like this job name + job sequence + pdf sequence. So the first PDF inside the first zip will have this text XNKXMN + AA + 000001, and the one after that is XNKXMN + AA + 000002. Here is my attempt
First I have abstract clas GenericText that represent my text.
public abstract class GenericText {
private float x;
private float y;
private float rotation;
/**
* Since the text that the user want to insert onto the Pdf might vary
* from page to page, or from logical document to logical document, we allow
* the user to write their own implementation of the text. To give the user enough
* flexibility, we give them the reference to the physical page index, the logical page index.
* #param physcialPage The actual page number that the user current looking at
* #param logicalPage A Pdf might contain multiples sub-documents, <code>logicalPage</code>
* tell the user which logical sub-document the system currently looking at
*/
public abstract String generateText(int physicalPage, int logicalPage);
GenericText(float x, float y, float rotation){
this.x = x;
...
}
}
JobGenerator.java: my generic API to do what I describe above
public String generatePrintJob(List<File> pdfList, String outputPath,
String printName, String seq, List<GenericText> textList, int maxSize)
for (int currentPdfDocument = 0; currentPdfDocument < pdfList.size(); currentPdfDocument++) {
File pdf = pdfList.get(currentPdfDocument);
if (currentPdfDocument % maxSize != 0) {
if(textList != null && !textList.isEmpty()){
for(GenericText gt : textList){
String text = gt.generateText(currentPdfDocument, currentPdfDocument)
//Add the text content to the PDF using PdfReader and PdfWriter
}
}
...
}else{
//Close the current output stream and zip output stream
seq = Utils.getNextSeq(seq);
jobPath = outputPath + File.separator + printName + File.separator + seq + ".zip"
//Open new zip output stream with the new <code>jobPath</code>
}
}
}
So now in my main class I would just do this
final String printName = printNameLookup.get(baseOutputName);
String jobSeq = config.getPrintJobSeq();
final String seq = jobSeq;
GenericText keyline = new GenericText(90, 640, 0){
#Override
public String generateText(int physicalPage, int logicalPage) {
//if logicalPage = 1, Utils.right(String.valueOf(logicalPage), 6, '0') -> 000001
return printName + seq + " " + Utils.right(String.valueOf(logicalPage), 6, '0');
}
};
textList.add(keyline);
JobGenerator pjg = new JobGenerator();
pjg.generatePrintJob(...,..., printName, jobSeq, textList, 1000);
The problem that I am having with this design is that, even though I process archive the PDF into two zip correctly, the text is not correctly reflect. The print and the sequence does not change accordingly, it stay XNKXMN + AA for 2000 PDF instead of XNKXMN + AA for the first 1000 and change to XNKXMN + AB for the later 1000. There seems to be flawed in my design, please help
EDIT:
After looking at toto2 code, I see my problem. I create GenericText with the hope of adding text anywhere on the pdf page without affecting the basic logic of the process. However, the job sequence is by definition depending on the logic,as it need to increment if there are too many PDFs for one ZIP to handle (> maxSize). I need to rethink this.

When you create an anonymous GenerateText, the final seq which you use in the overridden generateText method is truly final and will always remain the value given at creation time. The update you carry on seq inside the else in generatePrintJob does nothing.
On a more general note, your code looks very complex and you should probably take a step back and do some major refactoring.
EDIT:
I would instead try something different, with no template method pattern:
int numberOfZipFiles =
(int) Math.ceil((double) pdfList.size() / maxSize);
for (int iZip = 0; iZip < numberOfZipFiles; iZip++) {
String batchSubName = generateBatchSubName(iZip); // gives AA, AB,...
for (int iFile = 0; iFile < maxSize; iFile++) {
int fileNumber = iZip * maxSize + iFile;
if (fileNumber >= pdfList.size()) // can happen for last batch
return;
String text = jobName + batchSubName + iFile;
... add "text" to pdfList.get(fileNumber)
}
}
However, you might also want to maintain the template pattern. In that case, I would keep the for-loops I wrote above, but I would change the generating method to genericText.generateText(iZip, iFile) where iZip = 0 gives AA and iZip = 1 gives AB, etc:
for (int iZip = 0; iZip < numberOfZipFiles; iZip++) {
for (int iFile = 0; iFile < maxSize; iFile++) {
int fileNumber = iZip * maxSize + iFile;
if (fileNumber >= pdfList.size()) // can happen for last batch
return;
String text = genericText.generateText(iZip, iFile);
... add "text" to pdfList.get(fileNumber)
}
}
It would be possible also to have genericText.generateText(fileNumber) which could itself decompose the fileNumber in AA000001, etc. But that would be somewhat dangerous because maxSize would be used in two different places and it might be bug prone to have duplicate data like that.

Automatically opening pages on different monitors

I am designing an emergency response page, which needs to display information across 3 different monitors. The first monitor will gather information about the caller, and then contain 2 links. The first link needs to display a different web page on the 2nd monitor, and the 2nd link needs to display a different web page on the 3rd monitor.
Is this possible?
Thanks for any help

The first link needs to display a different web page on the 2nd monitor, and the 2nd link needs to display a different web page on the 3rd monitor.
While, depending on your operating system, it is possible to control where a window appears, there are much fewer options for doing this using javascript / serverside code over HTTP / browsers.
The only sensible way to achieve this is by configuring the displays to be tiles of a larger display rather than independent screens (for *nix/BSD/Linux, check out xinerama).
The code below saves the size of a window - and would only need some simple changes to support x/y offset and multiple windows - I leave it to you as to how you differentiate between the windows.
A simpler approach would be to just have one huge window with frames whose borders align with the monitors.
if (document.getElementById && !document.all) { // NOT for MSIE
stickySizeOverloadOnload(stickySizeSetWindowSize);
stickySizeOverloadOnresize(stickySizeSaveWindowSize);
}
function stickySizeSaveWindowSize(event)
{
var expiry = new Date();
var path = document.location.pathname;
expiry.setDate(expiry.getDate()+500);
stickySizeSetCookie('windowSize', window.outerWidth + ',' + window.outerHeight, expiry, path);
}
function stickySizeSetWindowSize()
{
var saved=stickySizeGetCookie('windowSize');
var parts=new Array();
if (saved.length) {
parts = saved.split(',');
if ((parts[0]>100) && (parts[1]>100)) {
window.outerWidth=parts[0];
window.outerHeight=parts[1];
} else {
alert("invalid size - '" + saved + "'");
stickySizeDeleteCookie('windowSize');
}
}
}
function stickySizeOverloadOnload(func)
{
var oldhandler=window.onload;
if (typeof window.onload != "function") {
window.onload=func;
} else {
window.onload=function(event) {
oldhandler(event);
func(event);
}
}
}
function stickySizeOverloadOnresize(func)
{
var oldhandler=window.onresize;
if (typeof window.onresize != "function") {
window.onresize=func;
} else {
window.onresize=function(event) {
oldhandler(event);
func(event);
}
}
}
function stickySizeSetCookie(name, value, expires, path, domain, secure) {
var curCookie = name + "=" + escape(value) +
((expires) ? "; expires=" + expires.toGMTString() : "") +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
((secure) ? "; secure" : "");
document.cookie = curCookie;
}
function stickySizeGetCookie(name) {
var dc = document.cookie;
var prefix = name + "=";
var begin = dc.indexOf("; " + prefix);
if (begin == -1) {
begin = dc.indexOf(prefix);
if (begin != 0) return null;
} else
begin += 2;
var end = document.cookie.indexOf(";", begin);
if (end == -1)
end = dc.length;
return unescape(dc.substring(begin + prefix.length, end));
}
function stickySizeDeleteCookie(name, path, domain) {
if (stickySizeGetCookie(name)) {
document.cookie = name + "=" +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
"; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
}

You can open the links in a different window with the attribute target="windowName".
You have to set up the three windows manually, so assign them manually to the three screens. When you open a link again in a window it is still on the same screen.

Have a look at Java: Getting resolutions of one/all available monitors (instead of the whole desktop)?
(The answer discuss the GraphicsEnvironment.getLocalGraphicsEnvironment() call)

If you really want the windows to be locked to a specific monitor, you will need to implement this client side. Here is a link describing how to detect which monitor a window is on in Java, so you can move it to the proper monitor and maximize the window if you desire. Obviously you can implement the rest of the system server side and just display pages inside the windows you have created.

Is it possible to get a list of workflows the document is attached to in Alfresco

I'm trying to get a list of workflows the document is attached to in an Alfresco webscript, but I am kind of stuck.
My original problem is that I have a list of files, and the current user may have workflows assigned to him with these documents. So, now I want to create a webscript that will look in a folder, take all the documents there, and assemble a list of documents together with task references, if there are any for the current user.
I know about the "workflow" object that gives me the list of workflows for the current user, but this is not a solution for my problem.
So, can I get a list of workflows a specific document is attached to?

Well, for future reference, I've found a way to get all the active workflows on a document from javascript:
var nodeR = search.findNode('workspace://SpacesStore/'+doc.nodeRef);
for each ( wf in nodeR.activeWorkflows )
{
// Do whatever here.
}

I used packageContains association to find workflows for document.
Below i posted code in Alfresco JavaScript for active workflows (as zladuric answered) and also for all workflows:
/*global search, logger, workflow*/
var getWorkflowsForDocument, getActiveWorkflowsForDocument;
getWorkflowsForDocument = function () {
"use strict";
var doc, parentAssocs, packages, packagesLen, i, pack, props, workflowId, instance, isActive;
//
doc = search.findNode("workspace://SpacesStore/8847ea95-108d-4e08-90ab-34114e7b3977");
parentAssocs = doc.getParentAssocs();
packages = parentAssocs["{http://www.alfresco.org/model/bpm/1.0}packageContains"];
//
if (packages) {
packagesLen = packages.length;
//
for (i = 0; i < packagesLen; i += 1) {
pack = packages[i];
props = pack.getProperties();
workflowId = props["{http://www.alfresco.org/model/bpm/1.0}workflowInstanceId"];
instance = workflow.getInstance(workflowId);
/* instance is org.alfresco.repo.workflow.jscript.JscriptWorkflowInstance */
isActive = instance.isActive();
logger.log(" + instance: " + workflowId + " (active: " + isActive + ")");
}
}
};
getActiveWorkflowsForDocument = function () {
"use strict";
var doc, activeWorkflows, activeWorkflowsLen, i, instance;
//
doc = search.findNode("workspace://SpacesStore/8847ea95-108d-4e08-90ab-34114e7b3977");
activeWorkflows = doc.activeWorkflows;
activeWorkflowsLen = activeWorkflows.length;
for (i = 0; i < activeWorkflowsLen; i += 1) {
instance = activeWorkflows[i];
/* instance is org.alfresco.repo.workflow.jscript.JscriptWorkflowInstance */
logger.log(" - instance: " + instance.getId() + " (active: " + instance.isActive() + ")");
}
}
getWorkflowsForDocument();
getActiveWorkflowsForDocument();

Unfortunately the javascript API doesn't expose all the workflow functions. It look like getting the list of workflow instances that are attached to a document only works in Java (or Java backed webscripts).
List<WorkflowInstance> workflows = workflowService.getWorkflowsForContent(node.getNodeRef(), true);
A usage of this can be found in the workflow list in the document details: http://svn.alfresco.com/repos/alfresco-open-mirror/alfresco/HEAD/root/projects/web-client/source/java/org/alfresco/web/ui/repo/component/UINodeWorkflowInfo.java
To get to the users who have tasks assigned you would then need to use getWorkflowPaths and getTasksForWorkflowPath methods of the WorkflowService.