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A backing service is any service the app consumes over the network as part of its normal operation. Examples include datastores (such as MySQL or CouchDB), messaging/queueing systems (such as RabbitMQ or Beanstalkd), SMTP services for outbound email (such as Postfix), and caching systems (such as Memcached).

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Each distinct backing service is a resource. For example, a MySQL database is a resource; two MySQL databases (used for sharding at the application layer) qualify as two distinct resources. The twelve-factor app treats these databases as attached resources, which indicates their loose coupling to the deploy they are attached to.

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What properties belong on which backing beans? When is it appropriate to add more properties to a given bean as opposed to creating a new bean and adding the properties onto it? For simple applications, does it make sense to just have a single backing bean for the whole page, considering the complexity involved with injecting one bean into another? Should the backing bean contain any actual business logic, or should it strictly contain data?

Great question. I suffered a lot with the same dilemma when I moved to JSF. It really depends on your application. I'm from the Java EE world so I would recommend to have as little business logic in your backing beans as possible. If the logic is purely related to the presentation of your page, then it is fine to have it in the backing bean.

EDIT: Actually, if you are going to encapsulate every object property that you want to expose, I would recommend that you instead bind UI components to the backing bean and then inject the content directly into the value of the component.

I think the most important thing with your backing beans is to seperate their logics. If you have a front page for a CMS system I would see it as bad practice to put every piece of code into one bean because:

As for the coupling, I dont see it as a troublesome issue to allow your JSF pages access too the properties in objects in your backingbean. This is support which is built into JSF, and really just makes it easier to read and build imo. Your allready separating the MVC logic strictly. By doing this your saving yourself tons of lines with getters and setters in your backingbean. For example I have a really huge object given to me by the web services, where I need to use some properties in my presentation. If I were to make a getter/setter for each property my bean would expand with atleast 100 more lines of variables and methods for getting the propeties. By using the built in JSF functionality my time and precious code lines are spared.

This is fine to have a business logic in your backing bean. It depends where are you coming from. If you are practicing domain driven design, you will be tempted to include the business logic in to backing bean or may be persistence logic as well. They argue that why so dumb object. Object should carry not just state but behavior too. On the other hand if you consider traditional Java EE way of doing things, you might be feeling like having data in your backing bean, which also can be your entity bean, and other business and persistence logic in some session bean or something. That is fine too.

I would not necessary keep only one backing bean per page. It depends on functionality but most of the time I had one bean per page as mostly one page handle one functionality. For example on a page I have a register link (I will link with RegisterBean) and a shopping basket link (ShoopingBasketBean).

If I use auto-implemented properties (hereafter "aip") then I no longer have a private backing field to use internally. This is fine because the aip has no side-effects. But what if later on I need to add some extra processing in the get or set?

Now I need to create a backing-field so I can expand my getters and setters. This is fine for external code using the class, because they won't notice the difference. But now all of the internal references to the aip are going to invoke these side-effects when they access the property. Now all internal access to the once aip must be refactored to use the backing-field.

That said, it's trivial to get a list of references to a property. If you change to an explicit property and want your private code to access your new backing variable, that should be a fairly easy modification to make.

I started doing my first backup with backblaze and found that it was backing up around 122 GB of files...which is weird since I know I have at least 260 GB in my desktop folder alone (all datasets/documents, no Dmg files). I tried to see if there were any exclusion rules that prevented it, but nothing seems to be obvious. I also double checked against the website once my first backup was done and it looks like neither the desktop nor the downloads folder saved. I'm on a mac if that helps and here is my exclusion list:

A backing vocalist is a singer who provides vocal harmony with the lead vocalist or other backing vocalists. A backing vocalist may also sing alone as a lead-in to the main vocalist's entry or to sing a counter-melody. Backing vocalists are used in a broad range of popular music, traditional music, and world music styles.

Solo artists may employ professional backing vocalists in studio recording sessions as well as during concerts. In many rock and metal bands (e.g., the power trio), the musicians doing backing vocals also play instruments, such as guitar, electric bass or keyboards. In Latin or Afro-Cuban groups, backing singers may play percussion instruments or shakers while singing. In some pop and hip-hop groups and in musical theater, they may be required to perform dance routines while singing through headset microphones.

Styles of background vocals vary according to the type of song and genre of music. In pop and country songs, backing vocalists may sing harmony to support the lead vocalist. In hardcore punk or rockabilly, other band members who play instruments may sing or shout backing vocals during the chorus (refrain) section of the songs.

Alternative terms for backing vocalists include backing singer, backing vocals, additional vocals or, particularly in the United States and Canada, backup singer, background singer, or harmony.

While some bands use performers whose sole on-stage role is backing vocals, backing singers commonly have other roles. Two notable examples of band members who sang back-up are The Beach Boys and The Beatles. The Beach Boys were well known for their close vocal harmonies, occasionally with all five members singing at once such as "In My Room" and "Surfer Girl".

In the recording studio, some lead singers record their own backing vocals by overdubbing with a multitrack recording system, record their own backing vocals, then recording the lead part over them. Some lead vocalists prefer this approach because multiple parts recorded by the same singer blend well.

A famous example overdubbing is Freddie Mercury's multipart intro to Queen's "Bohemian Rhapsody".[1] Other artists who have recorded multitrack lead and backing vocals include Patrick Stump of Fall Out Boy, Tom DeLonge of Blink-182 and Angels and Airwaves, Wednesday 13 in his own band and Murderdolls, Ian Gillan of Deep Purple, Brendon Urie of Panic! at the Disco, Simon Le Bon of Duran Duran, and Brad Delp of Boston.

With the exception of a few songs on each album, Michael Jackson, Janet Jackson, Prince, Dan Fogelberg, Eddie Rabbitt, David Bowie, Harry Nilsson, and Richard Marx sing all of the background vocals for their songs. Robert Smith of the Cure sings his own backing vocals in the studio, and doesn't use backing vocalists when performing live.

Hi, I'm quite new to logic and creating music vids, for now I just want to get started by doing a few covers of songs that I like on guitar. For example I've found a decent backing track on YouTube that I like to play an extended solo of comfortably on, how would I make this an audio file and put it in logic in order to record?

When trying to VMotion from one ESX server to another, I receive this error:

Unable to migrate from ESX1 to ESX2: Virtual machine is configured to use a device that prevents migration: Device 'CD/DVD Drive 1' is a connected device with a remote backing.

If i view the virtual machine properties, the CD/DVD drive is showing as 'Connected - client unknown'. All of the CD/DVD properties are greyed out.

I can click the 'Disconnect D:' button on the toolbar with the VI client, but this doesnt have any effect.

Any ideas?!

P.S i even tried removing the CD/DVD device whilst the VM was powered off, powering up the VM, powering it down, and re adding the CD/DVD but this didnt have any effect.

Thanks

In this scenario the CD/DVD Device Status shows up as "Connected - client unknown" and all of the properties are greyed out, so you can't Edit the Settings.

I am not absolutely certain what the reason is for this behaviour, but I am able to recreate it...

Connect a CD to a VM, then shutdown & power off; now remove the CD (i.e. set to "Client Device"), then power back on. Now try to VMotion and Hey Presto "Device 'CD/DVD Drive 1' is a connected device with a remote backing" and all options greyed out.

The only certain workaround that I have found for this is to "Install VMware Tools"/"End VMware Tools Install", or even better disconnect the CD before shutting down the VM!

I had this issue on all my VMs since I had installed VMtools. I did a service mgmt-vmware restart on each ESX host 1 min later connected to unknown with the check box was gone...works like a charm.

This document was generated from the following thread: VMotion problem - 'device with remote backing'

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