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From: "Samuel Pelletier" <webobjects-dev@wocommunity.org>
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Subject: Re: [WO-DEV] Communication between 2 different browers (but same
 application)
Date: Sat, 30 Jan 2021 08:51:31 -0500
References: <list-25326134@post.selbstdenker.com>
To: WebObjects & WOnder Development <webobjects-dev@wocommunity.org>
In-Reply-To: <list-25326134@post.selbstdenker.com>
Message-Id: <89F215F0-2428-4BCB-AD3E-286362809F4D@samkar.com>
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X-FEAS-AUTH-USER: samuel%samkar.com

Hi Markus,

Sorry for the delay, my original message bounced du to large size =
(syntax colored code...)

I just did something like this yesterday!

As Dennis wrote, you need to adjust based on your needs. In my case, I =
wanted to integrate a simple barcode scanner to a custom WO app used for =
a small retail store inventory, I wanted a wireless barcode scanner =
connected to the server to eliminate the complexity of bluetooth pairing =
and the less than optimal user interaction possible when using a web app =
and a device on the browser computer.

My solution is very simple but only works as is on a single instance =
application and uses pooling.

My scanner is connected to a Raspberry Pi that send the code to a direct =
action. My system can support multiple scanners. By default, received =
codes are simply discarded.

When I want to use a scanner, the component register an handler to a =
scanner (found by a name) with the method that should receive the code. =
To implement the user interface, I use a AjaxLongResponse. The principle =
is simple, the content of AjaxLongResponse is refreshed every second by =
default until isRunning is false.

Hope you will find your answer with Dennis and this, you have 2 =
solutions with completely opposite requirements and scallability.

Regards,

Samuel


Here is the html used to edit the UPC code for a product =
(AjaxLongResponse is a specialized  AjaxUpdateContainer) :
<wo:AjaxLongResponse id =3D "barcodeField" isRunning =3D =
"$waitingForCode">
  <label>codeUPC<wo:not condition =3D "$waitingForCode">
      <wo:AjaxUpdateLink class =3D "tiny button right noMargins" =
updateContainerID =3D "_parent" action =3D "$waitForCode">Scan =
code</wo:AjaxUpdateLink>
    </wo:not>
    <wo:textfield class =3D "text-right" value =3D "$format.codeUPC" />
  </label>
</wo:AjaxLongResponse>

Component Java code :
public boolean waitingForCode() {
	return waitingForCode;
}

public WOActionResults waitForCode() {
	waitingForCode =3D true;
	BarCodeScanner.withName("sam").registerHandler(new =
BarCodeScanner.Handler() {
		@Override
		public boolean keepHandlerAfterProcessingCode(String =
code) {
			format().setCodeUPC(code);
			save();
			waitingForCode =3D false;
			return false;
		}
	});
	return null;
}

My handler returns true if it should remain registered (to scan a list =
of item for example).

The direct action send the scanned code with this:
BarCodeScanner.withName(scannerName).processCode(newCode);

BarCodeScanner.java
public class BarCodeScanner {
	static private Map<String, BarCodeScanner>scanners =3D new =
HashMap<>();
	private String name;
	private Handler handler;
=09
	public BarCodeScanner(String name) {
		this.name =3D name;
	}

	static public BarCodeScanner withName(String name) {
		BarCodeScanner scanner =3D scanners.get(name);
		if (scanner =3D=3D null) {
			scanner =3D new BarCodeScanner(name);
			scanners.put(name, scanner);
		}
		return scanner;
	}
=09
	public String name() {
		return name;
	}
=09
	public void registerHandler(Handler handler) {
		this.handler =3D handler;
	}
=09
	public void processCode(String code) {
		if (handler !=3D null) {
			if (handler.keepHandlerAfterProcessingCode(code) =
=3D=3D false) {
				handler =3D null;
			}
		}
	}
=09
	public static abstract class Handler {
		public abstract boolean =
keepHandlerAfterProcessingCode(String code);
	}
}



> Le 28 janv. 2021 =C3=A0 03:26, Markus Ruggiero (rucotec) =
<webobjects-dev@wocommunity.org> a =C3=A9crit :
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> I need some conceptual help.
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> Let=E2=80=99s say you have a browser open to a Wonder app (component =
based session). Imagine you go to a different computer and open another =
session (maybe via direct action) to the same application. I want to =
have a button (or some such) in the first window that when clicked =
communicates to that second independent window and enables some form =
fields there. The user then submits data to the application from that =
second window. The first window registers the submission and continues =
with the user interaction.
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> How would you do something like this? Is this possible at all? =
Possibly the second login could be from a mobile device and the =
presented browser page does not allow to do more interaction with the =
application than just enter some data and submit. The first session is =
required do wait for the data (or a cancel) and can then proceed.
>=20
> Thanks for any ideas / help
> =E2=80=94markus=E2=80=94
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> Markus Ruggiero
>=20
> rucotec GmbH                        web https://rucotec.ch
> Steinenvorstadt 79                email markus.ruggiero@rucotec.ch
> 4051 Basel / Switzerland         mobile +41 79 508 4701
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