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1. • Shared access signature

     • A shared access signature (SAS) provides delegated access to Event Hubs resources based on authorization rules. An authorization rule has a name, is associated with specific rights, and carries a pair of cryptographic keys. You use the rule’s name and key via the Event Hubs clients or in your own code to generate SAS tokens.
     learn.microsoft.com › en-us › azure

     Authorizing access to Event Hubs resources using Shared ...

2. Top results related to what is event hubs signature?

   • What is causing Azure Event Hubs ReceiverDisconnectedException/LeaseLostException?

     Top Answer

     Answered May 09, 2019 · 62 votes

     TLDR: This behavior is absolutely normal.

     Why can't Lease Management be smooth & exception-free: To give more control on the situation to developer.

     The really long story - all-the-way from Basics EventProcessorhost (hereby EPH - is very similar to what __consumer_offset topic does for Kafka Consumers - partition ownership & checkpoint store) is written by Microsoft Azure EventHubs team themselves - to translate all of the EventHubs partition receiver Gu into a simple onReceive(Events) callback.

     EPH is used to address 2 general, major, well-known problems while reading out of a high-throughput partitioned streams like EventHubs:

     • fault tolerant receive pipe-line - for ex: a simpler version of the problem - if the host running a PartitionReceiver dies and comes back - it needs to resume processing from where it left. To remember the last successfully processed EventData , EPH uses the blob supplied to EPH constructor to store the checkpoints - when ever user invokes context.CheckpointAsync() . Eventually, when the host process dies (for ex: abruptly reboots or hits a hardware fault and never/comesback) - any EPH instance can pick up this task and resume from that Checkpoint .
     • Balance/distribute partitions across EPH instances - lets say, if there are 10 partitions and 2 EPH instances processing events from these 10 partitions - we need a way to divide partitions across the instances ( PartitionManager component of EPH library does this). We use Azure Storage - Blob LeaseManagement-feature to implement this. As of version 2.2.10 - to simplify the problem, EPH assumes that all partitions are loaded equally.

     With this, lets try to see what's going on: So, to start with, in the above example of 10 event hub partitions and 2 EPH instances processing events out of them:

     • lets say the first EPH instance - EPH1 started, at-first, alone and a part of start-up, it created receivers to all 10 partitions and is processing events. In the start up - EPH1 will announce that it owns all these 10 partitions by acquiring Leases on 10 storage blobs representing these 10 event hub partitions (with a standard nomenclature- which EPH internally creates in the Storage account - from the StorageConnectionString passed to the ctor). Leases will be acquired for a set time, after which the EPH instance will loose the ownership on this Partition.
     • EPH1 continually announces once in a while - that it is still owning those partitions - by renewing leases on the blob. Frequency of renewal, along with other useful tuning, can be performed using PartitionManagerOptions
     • now, lets say, EPH2 starts up - and you supplied the same AzureStorageAccount as EPH1 to the ctor of EPH2 as well. Right now, it has 0 partitions to process. So, to achieve balance of partitions across EPH instances, it will go ahead and download the list of all leaseblobs which has the mapping of owner to partitionId. From this, it will STEAL leases for its fair share of partitions - which is 5 in our example, and will announce that information on that lease blob. As part of this, EPH2 reads the latest checkpoint written by PartitionX it wants to steal the lease for and goes ahead and creates corresponding PartitionReceiver's with the EPOCH same as the one in the Checkpoint.
     • As a result, EPH1 will loose ownership of these 5 partitions and will run into different errors based on the exact state it is in. if EPH1 is actually invoking the PartitionReceiver.Receive() call - while EPH2 is creating the PartitionReceiver on the same receiver - EPH1 will experience ReceiverDisconnectedException. This will eventually, invoke IEventProcessor.Close(CloseReason=LeaseLost). Note that, probability of hitting this specific Exception is higher, if the messages being received are larger or the PrefetchCount is smaller - as in both cases the receiver would be performing more aggressive I/O.
     • if EPH1 is in the state of checkpointing the lease or renewing the lease, while the EPH2 stole the lease, the EventProcessorOptions.ExceptionReceived eventHandler would be signaled with a leaselostException (with 409 conflict error on the leaseblob) - which also eventually invokes IEventProcess.Close(LeaseLost).

     Why can't Lease Management be smooth & exception-free:

     To keep the consumer simple and error-free, lease management related exceptions could have been swallowed by EPH and not notified to the user-code at all. However, we realized, throwing LeaseLostException could empower customers to find interesting bugs in IEventProcessor.ProcessEvents() callback - for which the symptom would be - frequent partition-moves

     • minor network outage on a specific machine - due to which EPH1 fails to renew leases and comes back up! - and imagine if the n/w of this machine stands flaky for a day - EPH instances are going to play ping-pong with Partitions! This machine will continuously try to steal the lease from other machine - which is legitimate from EPH point-of-view - but, is a total disaster for the user of EPH - as it completely interferes with the processing pipe. EPH - would exactly see a ReceiverDisconnectedException, when the n/w comes back up on this flaky m/c! We think the best and infact the only way is to enable the developer to smell this!
     • or a simple scenario like, having a bug in ProcessEvents logic - which throws unhandled exceptions which are fatal and brings down the whole process - ex: a poison event. This partition is going to move around a lot.
     • customers, performing write/delete operations on the same storage account which EPH is also using - by mistake (like an automated clean-up script) etc.
     • last but not the least - which we never wish could happen - say a 5 min outage on Azure d.c where a specific EventHub.Partition is located - say n/w incident. Partitions are going to move around across EPH instances.

     Basically, in majority of situations, it would be tricky - for us to detect the diff. between these situations and a legitimate leaseLost due to balancing and we want to delegate control of these situations to the Developer.

     more on Event Hubs...

     Check all answers on Stack Overflow

     1/5

   • What is the type signature of the MUI DatePicker `onChange` event?

     Top Answer

     Answered Jun 29, 2023 · 3 votes

     The onChange property is defined in the UsePickerValueBaseProps<TValue, TError> interface, as:

     onChange?: (value: TValue, context: PickerChangeHandlerContext<TError>) => void;-

     The TValue generic parameter is coming from the DatePicker itself, so you can specify it in the component and the onChange method will have the correct typing:

     <DatePicker<Moment> onChange={(date: Moment | null) => { setValue(date); console.log(date); }}/>

     You get an error if you don't define it, because TValue has a default type of Date.

     Check all answers on Stack Overflow

     2/5

   • What is the event listener for when UsbManager Request Permission is called to execute a routine when a permission is granted?

     Top Answer

     Answered Dec 27, 2019 · 3 votes

     I finally figured it out taking a closer look at this.

     I have this before trying to establish an intent filter.

     public static final String INTENT_ACTION_GRANT_USB = BuildConfig.APPLICATION_ID + ".GRANT_USB";PendingIntent usbPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(INTENT_ACTION_GRANT_USB), 0);IntentFilter filter = new IntentFilter();-

     And I changed it to this.

     private static final String ACTION_USB_PERMISSION = BuildConfig.APPLICATION_ID + ".USB_PERMISSION";m_permissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);-

     The key difference was that new IntentFilter needed that ACTION_USB_PERMISSION string.

     Now in my Broadcast Receiver, I have this condition that is being called as expected.

     else if (ACTION_USB_PERMISSION.equals(action)) { if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) { m_textViewDebug.setText("USB Permission Granted"); try { OnDevicePermissionGranted(); } catch (Exception e) { m_textViewDebug.setText(e.getMessage()); } } else { m_textViewDebug.setText("USB Permission Denied"); }}

     Took me a while to figure out how to use EXTRA_PERMISSION_GRANTED. When this here says "EXTRA_PERMISSION_GRANTED containing boolean indicating whether permission was granted by the user" I'm thinking this whole time I'm trying to find a boolean flag on some object to verify permission. I didn't realize I had to call a special method on the intent and supply that string to get my true or false. Seems very counter intuitive to me.

     I realize the biggest mistake was not supplying the correct string when making the new intent filter. I found a bunch of other examples that had it without any arguments.

     Check all answers on Stack Overflow

     3/5

   • What is Event bubbling and Event Capturing in JavaScript ?

     Event bubbling and event capturing are the two interesting concepts of JavaScript. Before diving deep into these fascinating concepts, let us first know about what an event listener is? An event listener is basically a function that waits for an event to occur. That event can be anything like a mouse click event, submitting a form, pressing keys of a keyboard, etc.

     An event listener contains three parameters and it can be defined using the following syntax.

     <element>.addEventListener(<eventName>, <callbackFunction>, {capture : boolean});

     • <element>: The element to which an event listener is attached.
     • <eventName>: It can be ‘click’,’key up’,’key down’ etc. events.
     • <callbackFunction>: This function fires after the event happened.
     • {capture: boolean}: It tells whether the event will be in the capture phase or in the bubbling phase (optional)

     Example 1: Let’s take an example...

     Check all answers on Geeksforgeeks

     4/5

   • What is event bubbling and capturing?

     Top Answer

     Answered Apr 09, 2019 · 1744 votes

     Event bubbling and capturing are two ways of event propagation in the HTML DOM API, when an event occurs in an element inside another element, and both elements have registered a handle for that event. The event propagation mode determines in which order the elements receive the event.

     With bubbling, the event is first captured and handled by the innermost element and then propagated to outer elements.

     With capturing, the event is first captured by the outermost element and propagated to the inner elements.

     Capturing is also called "trickling", which helps remember the propagation order:

     trickle down, bubble up

     Back in the old days, Netscape advocated event capturing, while Microsoft promoted event bubbling. Both are part of the W3C Document Object Model Events standard (2000).

     IE < 9 uses only event bubbling, whereas IE9+ and all major browsers support both. On the other hand, the performance of event bubbling may be slightly lower for complex DOMs.

     We can use the addEventListener(type, listener, useCapture) to register event handlers for in either bubbling (default) or capturing mode. To use the capturing model pass the third argument as true.

     Example

     <div> <ul> <li></li> </ul></div>

     In the structure above, assume that a click event occurred in the li element.

     In capturing model, the event will be handled by the div first (click event handlers in the div will fire first), then in the ul, then at the last in the target element, li.

     In the bubbling model, the opposite will happen: the event will be first handled by the li, then by the ul, and at last by the div element.

     For more information, see

     • Event Order on QuirksMode
     • addEventListener on MDN
     • Events Advanced on QuirksMode

     In the example below, if you click on any of the highlighted elements, you can see that the capturing phase of the event propagation flow occurs first, followed by the bubbling phase.

     var logElement = document.getElementById('log');-function log(msg) { logElement.innerHTML += ('<p>' + msg + '</p>');}function capture() { log('capture: ' + this.firstChild.nodeValue.trim());}function bubble() { log('bubble: ' + this.firstChild.nodeValue.trim());}function clearOutput() { logElement.innerHTML = "";}var divs = document.getElementsByTagName('div');for (var i = 0; i < divs.length; i++) { divs[i].addEventListener('click', capture, true); divs[i].addEventListener('click', bubble, false);}var clearButton = document.getElementById('clear');clearButton.addEventListener('click', clearOutput);

     p { line-height: 0;}div { display:inline-block; padding: 5px; background: #fff; border: 1px solid #aaa; cursor: pointer;}div:hover { border: 1px solid #faa; background: #fdd;}

     <div>1 <div>2 <div>3 <div>4 <div>5</div> </div> </div> </div></div><button id="clear">clear output</button><section id="log"></section>

     Another example at JSFiddle.

     Other Answers

     Answered Jan 06, 2011 · 573 votes

     Description:

     quirksmode.org has a nice description of this. In a nutshell (copied from quirksmode):

     Event capturing

     When you use event capturing

     | |---------------| |-----------------| element1 | | || -----------| |----------- || |element2 \ / | || ------------------------- || Event CAPTURING |-----------------------------------

     the event handler of element1 fires first, the event handler of element2 fires last.

     Event bubbling

     When you use event bubbling

     / \---------------| |-----------------| element1 | | || -----------| |----------- || |element2 | | | || ------------------------- || Event BUBBLING |-----------------------------------

     the event handler of element2 fires first, the event handler of element1 fires last.

     What to use?

     It depends on what you want to do. There is no better. The difference is the order of the execution of the event handlers. Most of the time it will be fine to fire event handlers in the bubbling phase but it can also be necessary to fire them earlier.

     Other Answers

     Answered Jun 25, 2017 · 85 votes

     If there are two elements element 1 and element 2. Element 2 is inside element 1 and we attach an event handler with both the elements lets say onClick. Now when we click on element 2 then eventHandler for both the elements will be executed. Now here the question is in which order the event will execute. If the event attached with element 1 executes first it is called event capturing and if the event attached with element 2 executes first this is called event bubbling. As per W3C the event will start in the capturing phase until it reaches the target comes back to the element and then it starts bubbling

     The capturing and bubbling states are known by the useCapture parameter of addEventListener method

     eventTarget.addEventListener(type,listener,[,useCapture]);

     By Default useCapture is false. It means it is in the bubbling phase.

     var div1 = document.querySelector("#div1");var div2 = document.querySelector("#div2");div1.addEventListener("click", function (event) { alert("you clicked on div 1");}, true);div2.addEventListener("click", function (event) { alert("you clicked on div 2");}, false);

     #div1{ background-color:red; padding: 24px;}#div2{ background-color:green;}

     <div id="div1"> div 1 <div id="div2"> div 2 </div></div>

     Please try with changing true and false.

     Check all answers on Stack Overflow

     5/5

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3. People also ask

   How do event hubs use shared access signatures?

   • Event Hubs uses Shared Access Signatures, which are available at the namespace and event hub level. A SAS token is generated from a SAS key and is an SHA hash of a URL, encoded in a specific format. Event Hubs can regenerate the hash by using the name of the key (policy) and the token and thus authenticate the sender.

   Overview of features - Azure Event Hubs - Azure Event Hubs

   learn.microsoft.com/en-us/azure/event-hubs/event-hubs-features

   See all results for this question

   What are shared access signatures (SAS) for Event Hubs resources?

   • Shared access signatures (SAS) for Event Hubs resources provide limited delegated access to Event Hubs resources. Adding constraints on time interval for which the signature is valid or on permissions it grants provides flexibility in managing resources. For more information, see Authenticate using shared access signatures (SAS).

   Authorize access to Azure Event Hubs - Azure Event Hubs

   learn.microsoft.com/en-us/azure/event-hubs/authorize-access-event-hubs

   See all results for this question

   Does Azure Event Hubs allow access to secure resources?

   • Azure Event Hubs offers the following options for authorizing access to secure resources: This article applies to both Event Hubs and Apache Kafka scenarios. Microsoft Entra integration with Event Hubs resources provides Azure role-based access control (Azure RBAC) for fine-grained control over a client's access to resources.

   Authorize access to Azure Event Hubs - Azure Event Hubs

   learn.microsoft.com/en-us/azure/event-hubs/authorize-access-event-hubs

   See all results for this question

   How does an event hub work?

   • Typically, an event hub employs one publisher per client. All messages that are sent to any of the publishers of an event hub are enqueued within that event hub. Publishers enable fine-grained access control. Each Event Hubs client is assigned a unique token, which is uploaded to the client.

   Authenticate access to Azure Event Hubs with shared access signatures

   learn.microsoft.com/en-us/azure/event-hubs/authenticate-shared-access-signature

   See all results for this question

4. learn.microsoft.com › en-us › azureOverview of features - Azure Event Hubs - Azure Event Hubs

   learn.microsoft.com › en-us › azure

   • Cached

   Feb 15, 2024 · Event Hubs uses Shared Access Signatures, which are available at the namespace and event hub level. A SAS token is generated from a SAS key and is an SHA hash of a URL, encoded in a specific format. Event Hubs can regenerate the hash by using the name of the key (policy) and the token and thus authenticate the sender.

5. stackoverflow.com › questions › 49411391Client vs Publisher in Azure Event Hubs - Stack Overflow

   stackoverflow.com › questions › 49411391

   • Cached

   Mar 21, 2018 · Any entity that sends data to an event hub is an event producer, or event publisher. Event publishers can publish events using HTTPS or AMQP 1.0. Event publishers use a Shared Access Signature (SAS) token to identify themselves to an event hub, and can have a unique identity, or use a common SAS token.

6. www.youtube.com › watchGetting Started with Azure Event Hub: A Complete Introduction

   www.youtube.com › watch

   • Cached

   

   19:02

   Learn the fundamentals of Azure Event Hub in this comprehensive introduction. Discover how Event Hub can help you process and manage large amounts of event d...

   • Views: 5.2K
   • Author: SoftWiz Circle

7. dev.to › reniciuspagotto › understanding-azure-eventUnderstanding Azure Event Hubs Capture - DEV Community

   dev.to › reniciuspagotto › understanding-azure-event

   • Cached

   Dec 22, 2022 · What is Event Hubs Capture? It's a feature of Azure Event Hub that allows Azure Blob Storage or Azure Data Lake Storage Gen 1 and Gen 2 to automatically receive all events sent to the hub with the flexibility to specify a time interval or size.

8. azuresdkdocs.blob.core.windows.net › $web › dotnetAzure Event Hubs client library for .NET | Azure SDK for .NET

   azuresdkdocs.blob.core.windows.net › $web › dotnet

   • Cached

   Azure Event Hubs is a highly scalable publish-subscribe service that can ingest millions of events per second and stream them to multiple consumers. This lets you process and analyze the massive amounts of data produced by your connected devices and applications.