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What is Sitecore Event queue?
The event queue is a table named EventQueue in the Master database on the Content Management instance. It is used to share events between instances – mostly during index updates and cache clearing. The publishing queue is a table named PublishQueue in the Master database on the Content Management instance.
What is Event queue and how it works?
An event queue is basically a FIFO queue of events, with some functions to efficiently and safely handle adding and getting events to / from such a queue. An event queue is bound to a thread, but any thread or ISR can put events into a queue. An event is a structure containing a pointer to an event handler.
What is event queue in Java?
EventQueue is a platform-independent class that queues events, both from the underlying peer classes and from trusted application classes. …
Are Games event-driven programming?
Most games aren’t event-driven like this, but it is common for a game to have its own event queue as the backbone of its nervous system. You’ll often hear “central”, “global”, or “main” used to describe it. It’s used for high level communication between game systems that want to stay decoupled.
What is event demultiplexer?
Synchronous Event Demultiplexer. Uses an event loop to block on all resources. The demultiplexer sends the resource to the dispatcher when it is possible to start a synchronous operation on a resource without blocking (Example: a synchronous call to read() will block if there is no data to read.
What is EventQueue invokeLater?
public static void invokeLater(Runnable runnable) Causes runnable to have its run method called in the dispatch thread of the system EventQueue . This will happen after all pending events are processed.
What are the advantages and disadvantages of event-driven programming?
Advantages and Disadvantages of Event-Driven Programming
- Flexibility.
- Suitability for Graphical Interfaces.
- Simplicity of Programming.
- Easy to Find Natural Dividing Lines.
- Highly Compostable.
- Simple and Understandable.
- Purely Procedural and Purely Imperative.
- A good way to Model Systems.
What is an event in event-driven architecture?
An event-driven architecture uses events to trigger and communicate between decoupled services and is common in modern applications built with microservices. An event is a change in state, or an update, like an item being placed in a shopping cart on an e-commerce website.
What does Sitecore event queue do for scalability?
Sitecore EventQueue architecture gives great scalability to Sitecore, launched with version 6.3. Enabling it can allows clustering of Content Management Servers (CMs) and Content Delivery Servers (CDs). It allows events on one server to be executed on other servers in a cluster. Suppose, there are two instances of CM.
Where does the remote event go in Sitecore?
Now, the remote event is passed into Event Queue table in the respective Sitecore database. This event contains many things like Item Id, the Sitecore Instance Name on which event occured, Instance Type, Instance Data, User Name, date time when event occured, etc.
How often does Sitecore clean up publish queue?
Much like the Sitecore event queue, the publish queue can grow quite large and potentially impact publishing performance. Sitecore has an agent that (by default) cleans up older entries (30 days) in the publish queue every 4 hours. This configuration is located in Sitecore.config: The general rule of accessing the Sitecore databases: don’t.
Why does Sitecore skip items in incremental publish?
As it turns out, fewer items might be published than what’s indicated by this number. During an Incremental publish, Sitecore checks to be sure each item actually has changes that need to be published – and skips items that don’t necessarily need updated. Do you have questions, comments, or corrections for this post?