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Managing the cache

From: ColdFusion 9 New Features

Video: Managing the cache

When dealing with cached content, you can't always rely on timeout values for managing the cache. There are times when you need to forcibly update or remove something and you need it to happen right away. In this video I am going to show you how to figure out what you have in your cache and show you how to add and remove items at any time. So to get started we are going to use the same file we used in the caching page fragments video. And the first time I am going to show you how to do is to make it so that this cached page fragment is available to other pages, so we can get it into the cache properly to manage it.

Managing the cache

When dealing with cached content, you can't always rely on timeout values for managing the cache. There are times when you need to forcibly update or remove something and you need it to happen right away. In this video I am going to show you how to figure out what you have in your cache and show you how to add and remove items at any time. So to get started we are going to use the same file we used in the caching page fragments video. And the first time I am going to show you how to do is to make it so that this cached page fragment is available to other pages, so we can get it into the cache properly to manage it.

So currently I just have everything with a cfcache tag wrapped around it. Generally if you are going to be caching data that's used in multiple places, you'll have a single file that perhaps runs on a schedule and we re-caches the data into the cache. So to change the way this works, we are going to take off the cfcache tag and instead wrap all of this into a cfsavecontent and put all of the content into a new variable.

So now I have all of this content in a variable called CachedPagecontent. So down here at the bottom, I am going to get rid of this closing cfcache tag, and instead say cfset Cache Put. I am going to specify an ID for this content and then the actual content that I want to be cached. So we are going to call this Artistlist and we are going to put our CachedPagecontent in there. So I am going to go to my browser and we still have our pagefragment cfm open.

I am going to reload that page and I don't have any output because I am not outputting anything to the screen. Now that I have some new item with an ID in my cache, let's open cachemanagement.cfm and play around a little bit. The first thing we are going to do is dump out all of the IDs for our data in the cache. I use the CacheGetAllIDs() function. If I preview that file, you'll see that I only have one item in my cache called ARTISTLIST. Now that doesn't tell me a whole lot, but I can get some information about what's in there.

For example, I can also dump out cacheGetMetadata and I can tell it dump out all the metadata on Artistlist. I'll reload that page and we can see that particular item hasn't been hit at all and hasn't been missed either obviously. But I can see when it was created, how long it will stay idle before it gets removed from the cache and when it will expire. So these are default values. You can provide an idle timeout and regular timeout directly in the cacheput() function.

We can also see the size of the data inside that cache. So what if I want to get that data out? Let's go back to the source code here and I want to output what is in the ArtistList cache item. So I can do ArtistList, I'll reload my page and we can see all of the data that was cached into the ArtistList item. Now if I reload this page again, here you see that the hitcount is going up and my lasthit is also going up.

So I can see how many times data that's in the cache actually gets hit. Now let's say I want to remove that data from the cache. I can use cfset CashRemove, say ArtistList and now that data has been removed from the cache. I'll reload the page and we can see that my array and struct are both empty. If I go back over to pagefragments and load it, go back over to cachemanagement and reload it, and you can see that data gets added back to the cache and because I still have the CacheRemove, if I refresh it's dropped out of the cache again.

Now let's do that one more time. I want you to see how the counts change. So now I have reloaded it back into the cache. I am going to go over to cachemanagement and take out our CacheRemove. Now if I reload this page, take a look at the hitcount versus the misscount versus the regular hitcount. So cash hitcount means that this particular ID has been hit 10 times. It's been missed 5, I loaded a page 5 times where that cache item did not exist, and the current item in the cache hasn't been hit at all.

If I reload the page, we can see that the hitcounts go up and the misscount stays the same. And those were all the biggies for managing cache inside ColdFusion 9. You now know how to put a new item in the cache, get it back out and take a look at all of the IDs that are in your cache so that you can go find out more about them.

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This video is part of

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ColdFusion 9 New Features

36 video lessons · 2914 viewers

Daniel Short
Author

 
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  1. 4m 30s
    1. Welcome
      53s
    2. Using the exercise files
      3m 37s
  2. 7m 48s
    1. Adding managing and comparing servers
      5m 26s
    2. Monitoring server health
      2m 22s
  3. 22m 10s
    1. Setting the default data source and SMTP
      5m 6s
    2. Getting programmatic debugging and exception handling
      5m 54s
    3. Reviewing the new onCFCRequest method
      5m 29s
    4. Using ApplicationStop()
      2m 24s
    5. Working with Server.cfc and onServerStart
      3m 17s
  4. 17m 45s
    1. Using ternary and chained operations
      5m 46s
    2. Using New and Import
      4m 2s
    3. Reviewing CFScript enhancements
      7m 57s
  5. 20m 23s
    1. Building with implicit getters and setters
      4m 26s
    2. Working with LOCAL scope in functions
      4m 35s
    3. Serializing objects
      6m 6s
    4. Writing components in CFScript
      5m 16s
  6. 19m 27s
    1. Getting started with ORM
      5m 51s
    2. Logging ORM activity
      2m 13s
    3. Saving objects to the database
      6m 10s
    4. Defining table relationships
      5m 13s
  7. 16m 59s
    1. Caching page fragments
      5m 29s
    2. Managing the cache
      4m 48s
    3. Working with in-memory files using VFS (RAM disks)
      6m 42s
  8. 12m 39s
    1. Working with Excel spreadsheets
      4m 56s
    2. Working with Word documents
      4m 4s
    3. Working with PowerPoint presentations
      3m 39s
  9. 28m 58s
    1. Loading Google maps with markers onto a page
      4m 53s
    2. Adding a Flash movie with the built-in FLV player
      2m 14s
    3. Using multi-file upload control
      6m 7s
    4. Building a progress indicator
      3m 37s
    5. Working with accordion layouts
      3m 18s
    6. Showing information with data grid enhancements
      5m 1s
    7. Informing users with Confirm Alert and Prompt dialog boxes
      3m 48s
  10. 9m 8s
    1. Accessing IMAP accounts
      6m 31s
    2. Working with the new array functions
      2m 37s
  11. 15s
    1. Goodbye
      15s

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