devexpress pdf viewer asp.net mvc : Convert pdf into jpg format control application system azure web page asp.net console Enterprise-Development-with-Flex27-part724

This endpoint doesn’t touch any messages that are not of the type 
ReliableClientMes
sage
. Note that some of the client messages arrive purposely marked as duplicates;
these will just be logged.
Resending Channel Guarantees Delivery
The next customization goes to the client’s channel. It has to monitor the server’s ac-
knowledgments for each message, and if they are not received in a timely fashion, it
must resend the messages. Does this idea sound familiar? The naming convention of
the channel also will follow the same pattern as in the server-side adapters and be called
ResendingRTMPChannel
.
This custom channel maintains a 
Dictionary
based on the unique 
messageId
of the
unconfirmed message records:
private  var unconfirmed:Dictionary ;
Every incoming message stays in this dictionary until acknowledged by the server. If
the duration of the stay is longer than a specified timeout, the channel resends the
message. The process is spiced up by the fact that the channel is shared by all the client’s
producers, and during the resend, we need to know which producer has to resend. That
is why 
unconfirmed
stores the reference to the producer’s base class, 
MessageAgent
, along
with the message itself; the unconfirmed messages that arrived from different clients
will be represented by different instances of 
MessageAgent
:
override public function send(
agent: MessageAgent, message:IMessage
) : void {
if (message is ReliableClientMessage) {
unconfirmed[ message.messageId] = {
message:message,
registeredTs: new Date().valueOf(),
agent:agent
};
...
}
To intercept the server’s acknowledgment in the Flex application, you can listen to
MessageAckEvent.ACKNOWLEDGE
. To intercept the acknowledgment even earlier, in the
channel you need to override 
getDefaultMessageResponder()
and also listen to
MessageAckEvent
. Then in the body of the event handler, 
onProducerAcknowledge()
re-
moves the corresponding record from the 
unconfirmed
collection (Example 5-27).
Example 5-27. Intercepting server’s acknowledgment inside custom ResendingRTMPChannel
override protected function getDefaultMessageResponder(
agent:MessageAgent, msg:IMessage
):MessageResponder {
if (msg is ReliableClientMessage) {
Resending Channel Guarantees Delivery y | | 247
Convert pdf into jpg format - Convert PDF to JPEG images in C#.net, ASP.NET MVC, WinForms, WPF project
How to convert PDF to JPEG using C#.NET PDF to JPEG conversion / converter library control SDK
bulk pdf to jpg; batch pdf to jpg online
Convert pdf into jpg format - VB.NET PDF Convert to Jpeg SDK: Convert PDF to JPEG images in vb.net, ASP.NET MVC, WinForms, WPF project
Online Tutorial for PDF to JPEG (JPG) Conversion in VB.NET Image Application
best convert pdf to jpg; change pdf to jpg image
if (agent != null && _defaultAgentListener[agent] == null ) {
_defaultAgentListener[agent] = agent;
agent.addEventListener(
MessageAckEvent.ACKNOWLEDGE,
onProducerAcknowledge
);
}
}
return super.getDefaultMessageResponder(agent, msg);
}
private function onProducerAcknowledge(event:MessageEvent):void{
var ackEvent:MessageAckEvent = event as MessageAckEvent;
var message:ReliableClientMessage = unconfirmed[
ackEvent.correlationId].message;
if (Log.isDebug()) logger.debug(
"ResendingChannel confirms message " + message.headers["seqNo"]
);
delete unconfirmed[ackEvent.correlationId];
}
Resending of the messages that were not confirmed for three seconds (note
RESEND_TIMEOUT
in Example 5-28) is handled by the timer thread that starts in the chan-
nel’s constructor.
Example 5-28. Resending of the unconfirmed messages
super(id, uri);
setInterval( resend, RESENDER_SLEEP_INTERVAL);
}
public function resend() : void {
for each (var record:Object in unconfirmed) {
var message:IMessage = record.message;
message.headers["duplicate"]="true";  //for tracing only
send( record.agent, message);
}
}
}
The only remaining channel functionality to implement is to deliberately drop
about 20 percent of messages (marked with 
tm
in the message header) to emulate
network problems. Example 5-29 presents the complete code of the Resen-
dingRTMPChannel.as file.
Example 5-29. ResendingRTMPChannel.as
package com.farata.messaging.channels {
import com.farata.messaging.messages.ReliableClientMessage;
import flash.events.IOErrorEvent;
import flash.utils.Dictionary;
248 | | Chapter 5: Customizing the Messaging Layer of LCDS or BlazeDS
Online Convert Jpeg to PDF file. Best free online export Jpg image
So, feel free to convert them too with our tool. Easy converting! If you want to turn PDF file into image file format in C# application, then RasterEdge
convert multiple pdf to jpg online; convert pdf to jpg batch
C# PDF Convert to Images SDK: Convert PDF to png, gif images in C#
Description: Convert all the PDF pages to target format images and output into the directory. Parameters: Name, Description, Valid Value.
convert pdf file into jpg; convert pdf to jpg
import flash.utils.setInterval;
import flash.utils.setTimeout;
import mx.logging.ILogger;
import mx.logging.Log;
import mx.messaging.MessageAgent;
import mx.messaging.MessageResponder;
import mx.messaging.channels.RTMPChannel;
import mx.messaging.events.MessageAckEvent;
import mx.messaging.events.MessageEvent;
import mx.messaging.messages.IMessage;
public class ResendingRTMPChannel extends
mx.messaging.channels.RTMPChannel   {
private  var unconfirmed:Dictionary ;
// Resend unconfirmed message after 3 sec
public static const RESEND_TIMEOUT:int = 3000;
public static const RESENDER_SLEEP_INTERVAL:int = 500;
super(id, uri);
unconfirmed = new Dictionary();
setInterval( resendNonDelivered , RESENDER_SLEEP_INTERVAL);
}
super.ioErrorHandler( event );
setTimeout(resend, 1);
}
public function resend() : void {
for each (var record:Object in unconfirmed) {
var message:IMessage = record.message;
message.headers["duplicate"]="true";  //for tracing only
send( record.agent, message);
}
}
}
override public function send(
agent: MessageAgent, message:IMessage
) : void {
if (message is ReliableClientMessage) {
unconfirmed[ message.messageId] = {
message:message,
registeredTs: new Date().valueOf(),
agent:agent
};
// Emulate 20% of "lost" messages
Resending Channel Guarantees Delivery y | | 249
C# Create PDF from images Library to convert Jpeg, png images to
Batch convert PDF documents from multiple image formats, including Jpg, Png, Bmp, Gif, Tiff, Bitmap, .NET If you want to turn PDF file into image file
change pdf to jpg; .net pdf to jpg
C# PDF Convert to Tiff SDK: Convert PDF to tiff images in C#.net
with specified zoom value and save it into stream The magnification of the original PDF page size Description: Convert to DOCX/TIFF with specified resolution and
conversion of pdf to jpg; change pdf file to jpg
if (Log.isDebug()) logger.debug(
);
return;
} else {
if (Log.isDebug()) logger.debug(
);
super.send( agent, message );
}
} else
super.send( agent, message );
}
private var _defaultAgentListener:Dictionary = new Dictionary();
override   protected function getDefaultMessageResponder(
agent:MessageAgent, msg:IMessage
):MessageResponder {
if (msg is ReliableClientMessage) {
if (agent != null && _defaultAgentListener[agent] == null ) {
_defaultAgentListener[agent] = agent;
agent.addEventListener(
MessageAckEvent.ACKNOWLEDGE,
onProducerAcknowledge
);
}
}
return super.getDefaultMessageResponder(agent, msg);
}
private function onProducerAcknowledge(event:MessageEvent):void{
var ackEvent:MessageAckEvent = event as MessageAckEvent;
var message:ReliableClientMessage = unconfirmed[
ackEvent.correlationId].message;
if (Log.isDebug()) logger.debug(
"ResendingChannel confirms message " + message.headers["seqNo"]
);
delete unconfirmed[ackEvent.correlationId];
}
private var logger:ILogger = Log.getLogger(
"com.farata.messaging.channels.ResendingRTMPChannel"
);
}
}
Our custom channel works in a symmetrical way to the server-side custom endpoint.
250 | | Chapter 5: Customizing the Messaging Layer of LCDS or BlazeDS
JPEG Image Viewer| What is JPEG
is an easy-to-use interface enabling you to quickly convert your JPEG images into other file formats, including Bitmap, Png, Gif, Tiff, PDF, MS-Word
change format from pdf to jpg; pdf to jpg
VB.NET Word: Word to JPEG Image Converter in .NET Application
NET example below on how to convert a local doc "Sample.docx" has been converted into an individual powerful & profession imaging controls, PDF document, image
change from pdf to jpg; convert pdf file to jpg
Testing Guaranteed Delivery from the Client
To test guaranteed delivery of the messages originated on the client, register
ResendingRTMPChannel
with service-config.xml as shown in Example 5-30.
Example 5-30. Endpoint for testing the No Client Message Left Behind solution
<channel-definition id="my-resending-client-rtmp"
class="com.farata.messaging.channels.ResendingRTMPChannel"
<endpoint uri="rtmp://{server.name}:2042"
<properties>
<idle-timeout-minutes>20</idle-timeout-minutes>
</properties>
</channel-definition>
Next, define the destination 
clientDeliveryTest
in messaging-config.xml (Exam-
ple 5-31).
Example 5-31. Messaging destination to test the No Client Message Left Behind solution
<destination id="clientDeliveryTest">
<adapter ref="actionscript"/>
<channels>
<channel ref="my-resending-client-rtmp" />
</channels>
</destination>
The testing application TestClientDelivery (Example 5-32) displays 
seqNo
from the
headers of the messages sent by the producer and, separately, 
lastProcessedNo
from
the headers of the acknowledgment messages that the server replies with. Figure 5-11
illustrates a particular run of the application when messages 7 and 3 were “swallowed”
by 
ResendingRTMPChannel
, emulating a loss of the messages elsewhere in the network.
As a result, these messages were resent by the channel, albeit a bit later. The corre-
sponding server log is presented in Example 5-33.
Example 5-32 lists the source code of the testing application.
Example 5-32. TestClientDelivery application
<?xml version="1.0" encoding="utf-8"?>
<!--TestClientDelivery.mxml-->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns:fs="http://www.faratasystems.com/2009/components"
layout="vertical" xmlns:local="*">
destination="clientDeliveryTest" />
<mx:Form>
<mx:FormItem label="Messages to send:">
<mx:TextInput text="10" id="msgCount"/>
<mx:Button label="Run Test"
click="runTest(Number(msgCount.text))"/>
</mx:FormItem>
Testing Guaranteed Delivery from the Client t | | 251
C# Image: How to Download Image from URL in C# Project with .NET
convert between different image formats or into other formats to byte, and how to convert an image powerful & profession imaging controls, PDF document, tiff
batch convert pdf to jpg; convert pdf to jpg file
VB.NET Create PDF from images Library to convert Jpeg, png images
Components to batch convert PDF documents in Visual Basic .NET class. If you want to turn PDF file into image file format in VB.NET class, then RasterEdge
convert pdf images to jpg; convert multiple pdf to jpg
<mx:FormItem label="Sent:">
<local:MessageBar id="sentBar" />
</mx:FormItem>
<mx:FormItem label="Acknowledged:">
<local:MessageBar id="ackBar" />
</mx:FormItem>
</mx:Form>
<mx:Script>
<![CDATA[
import mx.messaging.messages.IMessage;
import mx.messaging.events.MessageAckEvent;
import mx.messaging.Producer;
import com.farata.messaging.messages.ReliableClientMessage;
private function runTest(messageCount:int):void {
var message: ReliableClientMessage;
var messageSequence:Array = [];
sentBar.clean();
ackBar.clean();
for (var i : int = 0; i < messageCount; i++) {
message = new ReliableClientMessage(
// Header "tm" marks this message as a
// candidate to be lost by the channel
"Client message #"  + i, {tm:1}
);
messageSequence.push( message );
producer.send( message );
sentBar.addMessage(i, message.headers["seqNo"]);
}
}
var message:IMessage = event.acknowledgeMessage as IMessage;
var servedNumber:Number = message.headers["lastServedNumber"]
as Number;
//Assuming messageCount is not changing fast :)
ackBar.appendMessage(servedNumber);      }
]]>
</mx:Script>
<mx:TraceTarget />
</mx:Application>
This application has three buttons labeled Load Module, Modify Content, and Unload
Module, each associated with a similarly named function. Example 5-33 is the logfile
of a test run.
252 | | Chapter 5: Customizing the Messaging Layer of LCDS or BlazeDS
VB.NET PDF insert image library: insert images into PDF in vb.net
Support various image formats, like Jpeg or Jpg, Png, Gif Insert images into PDF form field in VB.NET. to provide users the most individualized PDF page image
convert pdf to 300 dpi jpg; advanced pdf to jpg converter
XDoc.HTML5 Viewer for .NET, All Mature Features Introductions
View, Convert, Edit, Sign Documents and Images. By integrating this mature .NET SDK into your ASP.NET PowerPoint: PPT, PPTX, PPS, PPSX; PDF: Portable Document
c# pdf to jpg; change pdf file to jpg online
Figure 5-11. Running the TestClientDelivery application
Example 5-33. Server log of the running TestClientDelivery application
[2009-06-25 21:16:32,140] Received message 0
[2009-06-25 21:16:32,156] Received message 1
[2009-06-25 21:16:32,156] Received message 2
[2009-06-25 21:16:32,156] Received message 4
[2009-06-25 21:16:32,156] Received message 5
[2009-06-25 21:16:32,171] Received message 6
[2009-06-25 21:16:32,171] Received message 8
[2009-06-25 21:16:32,171] Received message 9
[2009-06-25 21:16:35,234] Received message 7 (duplicate)
[2009-06-25 21:16:38,359] Received message 3 (duplicate)
As you can see, the custom 
ResendingRTMPChannel
delivers 100 percent of sent messages,
although order is not maintained. We will straighten this out in the next section.
Keeping Client Messages in Order
In a WAN environment, neither Flex LCDS nor BlazeDS can guarantee that the mes-
sages you are sending are coming in the same order that they were sent. For gaming or
trading applications, the consequences can be very serious.
What if your Buy and Modify requests come in the wrong order? How would you feel
about placing the straight-up roulette bet at 20, then moving to 21 after the ball stops
on 21? Actually, some sequencing mistakes can be beneficial for the gambler and some
can cause substantial losses of money. But developers of such client/server communi-
cations must remain neutral and ensure that the bets are placed in the right order.
Naturally, these things will not happen on the development local area network (LAN),
Keeping Client Messages in Order r | 253
but hey, people want to place bets while sitting in a small Internet café in a French
village or from their laptops by the Tiki Bar in Miami Beach.
Maintaining the proper order of the client messages is done the same way it’s done for
server-born messages: quarantine received out-of-order messages and let them out only
when the missing number comes in. The proper place to do this is the server-side cus-
tom endpoint: 
SerializingRTMPEndpoint
(see Example 5-34).
All classes involved in the solution are highlighted in Figure 5-12.
Figure 5-12. Classes involved in guaranteed and orderly delivery of the client-initiated messages
The logic implemented in 
SerializingRTMPEndpoint
is similar to that of 
SerializingRTMP
Channel
. In fact, it’s even simpler, because we can accumulate incoming messages and
lastServedNumber
in the 
FlexSession
attributes, isolating the processing for different
clients.
254 | | Chapter 5: Customizing the Messaging Layer of LCDS or BlazeDS
The 
FlexSession
class is supplied in LCDS and BlazeDS for session
management tasks, and we use it here just for illustration purposes. In
real life, you may be better off with your own custom-messaging-session
mechanism that doesn’t interfere with the HTTP domain.
Everything is done inside the overloaded 
serviceMessage()
method. If the message se-
quence number is one greater than 
lastServedNumber
, we process it straight through by
calling 
super.serviceMessage()
. We do not stop, however, because we might have other
messages locked in the incoming map. Increment 
lastServedNumber
and attempt to find
the adjacent message in the map. If found, send it out with 
super.serviceMessage()
and keep looping through the incoming map. If the message number is less than
lastServedNumber
, put it in the incoming map, but you should avoid calling
super.serviceMessage()
; the message will remain on hold. The complete code of
SerializingRTMPEndpoint
is shown in Example 5-34.
Example 5-34. SerializingRTMPEndpoint
public class SerializingRTMPEndpoint extends RTMPEndpoint {
package com.farata.messaging.endpoints;
import java.util.concurrent.ConcurrentHashMap;
import com.farata.messaging.messages.ReliableClientMessage;
import flex.messaging.FlexContext;
import flex.messaging.FlexSession;
import flex.messaging.endpoints.RTMPEndpoint;
import flex.messaging.messages.AcknowledgeMessage;
import flex.messaging.messages.Message;
import org.apache.log4j.Logger;
public class SerializingRTMPEndpoint extends RTMPEndpoint {
private final String INCOMING="incomingMessages";
private final String LAST_SERVED_NUMBER="lastServedNumber";
private final String SEQUENCE_NUMBER="seqNo";
@SuppressWarnings("unchecked")
public Message serviceMessage(Message message)    {
logger.info(message);
if ( message instanceof ReliableClientMessage ) {
FlexSession session =  FlexContext.getFlexSession();
AcknowledgeMessage acknowledgeMessage = null;
acknowledgeMessage = new AcknowledgeMessage();
acknowledgeMessage.setClientId(message.getClientId());
acknowledgeMessage.setCorrelationId(message.getMessageId());
if (session.getAttribute(INCOMING) == null)
session.setAttribute(
INCOMING,
new ConcurrentHashMap<Integer,Message>()
);
ConcurrentHashMap<Integer,Message> incoming =
Keeping Client Messages in Order r | 255
(ConcurrentHashMap<Integer,Message>) session.getAttribute(
INCOMING
);
int lastServedNumber = -1;
boolean isDebug=true;logger.isDebugEnabled();
if ( session.getAttribute(LAST_SERVED_NUMBER) != null )
lastServedNumber = (Integer)session.getAttribute(
LAST_SERVED_NUMBER
);
int seqNo = (Integer)message.getHeader(SEQUENCE_NUMBER) ;
String duplicate = (String)message.getHeader("duplicate");
if ((duplicate!=null) && isDebug)
if (isDebug) logger.debug(
"Client sent duplicate to compensate send failure "+ seqNo
);
if (seqNo <= lastServedNumber) {
if (isDebug) logger.debug(
"Ignoring message " + seqNo + " as already processed"
);
} else if (seqNo == lastServedNumber+1){
if (isDebug) logger.debug(
"Letting out incoming message " + seqNo
);
super.serviceMessage(message);
lastServedNumber++;
while
{
seqNo++;
if (isDebug) logger.debug(
"Yanking message " + seqNo + " out of the buffer"
);
super.serviceMessage(message);
lastServedNumber++;
}
} else  {
if (isDebug) logger.debug(
"Buffering message " + seqNo + " as out of order"
);
incoming.put(seqNo, message);
}
acknowledgeMessage.setHeader(LAST_SERVED_NUMBER,
return acknowledgeMessage;
} else
return super.serviceMessage(message);
}
256 | | Chapter 5: Customizing the Messaging Layer of LCDS or BlazeDS
Documents you may be interested
Documents you may be interested