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  • Leveraging Social Networks for Retail

    - by David Dorf
    For retailers, social media is all about B2C2C. That is, Business to Consumer to Consumer, or more specifically, retailer to influencer to consumer. Traditional marketing targeted mass media, trying to expose the message to as many people as possible. While effective, this approach has never been very efficient, with high costs for relatively low penetration. Then it was thought that marketers should focus their efforts on a relative few super-influencers that would then sway the masses. History shows a few successes with this approach but lacked any consistency or predictability. After all, if super-influencers were easy to find, most campaigns would easily go viral. Alas, research shows that most wide-spread trends were the result of several fortunate events, including some luck. So do people exert influence over each other when it comes to purchase decisions? Of course they do, all the time. But that influence is usually limited to a small set of friends and specific specialization. For instance, although I have 165 friends on Facebook, I am only able to influence my close friends and family on PC purchases, and I have no sway at all for fashion purchases. People trust my knowledge on technology, but nobody asks my advice on shoes. How then should retailers leverage social networks in order to reinforce brand image and push promotions? Two obvious ways are Like and Share. Online advertisements or wall-postings receive more clicks when the viewer sees that friends have "liked" the posting. That's our modern-day version of word-of-mouth advertising. Statistics show that endorsements from friends make it more likely a person will engage. If my friends and I liked it, then I might also "share" (or "retweet" in the case of Twitter) it with other friends. In that case the retailer has paid for X showings of the advertisement, but sharing has pushed it to an additional Y people at no cost. And further, the implicit endorsement by the sharer makes it more likely the recipient will engage. So a good first step is to find people active in social networks that will Like and Share in order to exert influence. Its still tough to go viral, but doubling engagement is still a big step in the right direction. More complex social graph analysis would be a second step, but I'll leave that topic for another day. If you're interested in the academic side of social dynamics, I suggest reading Duncan Watts' work.

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  • BPM ADF Task forms. Checking whether the current user is in a BPM Swimlane

    - by Christopher Karl Chan
    So this blog will focus on BPM Swimlane roles and users from a ADF context.So we have an ADF Task Details Form and we are in the process of making it richer and dynamic in functionality. A common requirement could be to dynamically show different areas based on the user logged into the workspace. Perhaps even we want to know even what swim-lane role the user belongs to.It is is a little bit harder to achieve then one thinks unless you know the trick. [Read More]

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  • BPM ADF Task forms. Checking whether the current user is in a BPM Swimlane

    - by Christopher Karl Chan
    @page { margin: 0.79in } P { margin-bottom: 0.08in } --Focus So this blog entry will focus on BPM Swimlane roles and users from a ADF context. So we have an ADF Task Details Form and we are in the process of making it richer and dynamic in functionality. A common requirement could be to dynamically show different areas based on the user logged into the workspace. Perhaps even we want to know even what swim-lane role the user belongs to. It is is a little bit harder to achieve then one thinks unless you know the trick. The Challenge The tricky part here is that the ADF Task Details Form is in fact part of a separate J2EE application to the main workspace. So if you try to use Java or Expression Language to get the logged in user you will only find anonymous and none of the BPM Roles you will be expecting. So what to do? The Magic First add the BC4J Security library to your view project. Then Restart JDeveloper. Now find the web.xml file in the view project of your ADF Task Details Application and look for the JpsFilter section. Then add in the following section. <init-param> <param-name>application.name</param-name> <param-value>OracleBPMProcessRolesApp</param-value></init-param> This will link your application to that of the BPM workspace. Then in your dynamic part of your ADF form you can now check whether the user logged into the BPM Workspace belongs in a BPM swim-lane in any BPM process. The best way to do this is by using expression language in the JSF page itself. Here I am simply changing the rendered flag to either true or false and thereby hiding or showing a section. Perhaps you are re-using the same form for a task in an approver swim-lane and ordinary user swimlane. So we only want the approver to see this field. So call the built in function to check if the user is a member of the BPM swim-lane role. The name of the role must be of the syntax BPMProject.RoleName <af:outputText value="This will only be rendered when the user is part of the BPM Swimlane Role rendered="#{securityContext.userInRole['BPMProjectName.Rolename']}"/> Now you must redeploy your ADF Task Form project Now (in the image above) the text will ONLY get rendered in the Task Details Form only if the user logged into the workspace is a member of the swimlane Unsecure of the BPM project SimpleTask

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  • "44 Tips" in PHP Magazin and Other NetBeans IDE Screencasts

    - by Geertjan
    My recent YouTube series "44 Tips for Front End Web Devs" (part 1, part 2) has been picked up by PHP Magazin: http://phpmagazin.de/news/Frontend-Entwicklung-mit-NetBeans-IDE-168339 Great. I'm working on more screencasts like that, from different angles. For example, one will methodically explain each and every window in NetBeans IDE; another will step through the creation of an application from conception to deployment; while another will focus on the NetBeans IDE extension points and how easily they can be used to add new features to NetBeans IDE. The screencast approach has, I think, a lot of advantages. They take less time to make and they seem to be more effective, in several ways, than tutorials. Hearing someone talk through a scenario seems to also put things in a clearer perspective than when you have everything written out in a document, where small details get lost and diversions are more difficult to make. Anyway, onwards to more screencasts. Any special requests?

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  • JPedal Action for Converting PDF to JavaFX

    - by Geertjan
    The question of the day comes from Mark Stephens, from JPedal (JPedal is the leading 100% Java PDF library, providing a Java PDF viewer, PDF to image conversion, PDF printing or adding PDF search and PDF extraction features), in the form of a screenshot: The question is clear. By looking at the annotations above, you can see that Mark has an ActionListener that has been bound to the right-click popup menu on PDF files. Now he needs to get hold of the file to which the Action has been bound. How, oh  how, can one get hold of that file? Well, it's simple. Leave everything you see above exactly as it is but change the Java code section to this: public final class PDF2JavaFXContext implements ActionListener {     private final DataObject context;     public PDF2JavaFXContext(DataObject context) {         this.context = context;     }     public void actionPerformed(ActionEvent ev) {         FileObject fo = context.getPrimaryFile();         File theFile = FileUtil.toFile(fo);         //do something with your file...     } } The point is that the annotations at the top of the class bind the Action to either Actions.alwaysEnabled, which is a factory method for creating always-enabled Actions, or Actions.context, which is a factory method for creating context-sensitive Actions. How does the Action get bound to the factory method? The annotations are converted, when the module is compiled, into XML registration entries in the "generated-layer.xml", which you can find in your "build" folder, in the Files window, after building the module. In Mark's case, since the Action should be context-sensitive to PDF files, he needs to bind his PDF2JavaFXContext ActionListener (which should probably be named "PDF2JavaFXActionListener", since the class is an ActionListener) to Actions.context. All he needs to do that is pass in the object he wants to work with into the constructor of the ActionListener. Now, when the module is built, the annotation processor is going to take the annotations and convert them to XML registration entries, but the constructor will also be checked to see whether it is empty or not. In this case, the constructor isn't empty, hence the Action should be context-sensitive and so the ActionListener is bound to Actions.context. The Actions.context will do all the enablement work for Mark, so that he will not need to provide any code for enabling/disabling the Action. The Action will be enabled whenever a DataObject is selected. Since his Action is bound to Nodes in the Projects window that represent PDF files, the Action will always be enabled whenever Mark right-clicks on a PDF Node, since the Node exposes its own DataObject. Once Mark has access to the DataObject, he can get the underlying FileObject via getPrimaryFile and he can then convert the FileObject to a java.io.File via FileUtil.getConfigFile. Once he's got the java.io.File, he can do with it whatever he needs. Further reading: http://bits.netbeans.org/dev/javadoc/

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  • Upcoming Upgrade Workshops in the US

    - by Mike Dietrich
    As Roy is really busy in traveling the whole North American continent I would like to highlight a few of Roy's upcoming workshops with registration links - so simply "click" and register :-) March 23, 2011: Philadelphia, PA March 24, 2011: Reston, VA April 07, 2011: Dallas, TX April 13, 2011: Birmingham, AL April 14, 2011: Minneapolis, MN Roy is looking forward to meet you in one of the above or the upcoming events in California and Oregon. Mike

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  • Mass Metadata Updates with Folders

    - by Kyle Hatlestad
    With the release of WebCenter Content PS5, a new folder architecture called 'Framework Folders' was introduced.  This is meant to replace the folder architecture of 'Folders_g'.  While the concepts of a folder structure and access to those folders through Desktop Integration Suite remain the same, the underlying architecture of the component has been completely rewritten.  One of the main goals of the new folders is to scale better at large volumes and remove the limitations of 1000 content items or sub-folders within a folder.  Along with the new architecture, it has a new look and a few additional features have been added.  One of those features are Query Folders.  These are folders that are populated simply by a query rather then literally putting items within the folders.  This is something that the Library has provided, but it always took an administrator to define them through the Web Layout Editor.  Now users can quickly define query folders anywhere within the standard folder hierarchy. [ Read More ]

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  • Mass Metadata Updates with Folders

    - by Kyle Hatlestad
    With the release of WebCenter Content PS5, a new folder architecture called 'Framework Folders' was introduced.  This is meant to replace the folder architecture of 'Folders_g'.  While the concepts of a folder structure and access to those folders through Desktop Integration Suite remain the same, the underlying architecture of the component has been completely rewritten.  One of the main goals of the new folders is to scale better at large volumes and remove the limitations of 1000 content items or sub-folders within a folder.  Along with the new architecture, it has a new look and a few additional features have been added.  One of those features are Query Folders.  These are folders that are populated simply by a query rather then literally putting items within the folders.  This is something that the Library has provided, but it always took an administrator to define them through the Web Layout Editor.  Now users can quickly define query folders anywhere within the standard folder hierarchy.   Within this new Framework Folders is the very handy ability to do metadata updates.  It's similar to the Propagate feature in Folders_g, but there are some key differences that make this very flexible and much more powerful. It's used within regular folders and Query Folders.  So the content you're updating doesn't all have to be in the same folder...or a folder at all.   The user decides what metadata to propagate.  In Folders_g, the system administrator controls which fields will be propagated using a single administration page.  In Framework Folders, the user decides at that time which fields they want to update. You set the value you want on the propagation screen.  In Folders_g, it used the metadata defined on the parent folder to propagate.  With Framework Folders, you supply the new metadata value when you select the fields you want to update.  It does not have to be defined on the parent folder. Because of these differences, I think the new propagate method is much more useful.  Instead of always having to rely on Archiver or a custom spreadsheet, you can quickly do mass metadata updates right within folders.   Here are the basic steps to perform propagation. First create a folder for the propagation.  You can use a regular folder, but a Query Folder will work as well. Go into the folder to get the results.   In the Edit menu, select 'Propagate'. Select the check-box next to the field to update and enter the new value  Click the Propagate button. Once complete, a dialog will appear showing it is complete What's also nice is that the process happens asynchronously in the background which means you can browse to other pages and do other things while it is still working.  You aren't stuck on the page waiting for it to complete.  In addition, you can add a configuration flag to the server to turn on a status indicator icon.  Set 'FldEnableInProcessIndicator=1' and it will show a working icon as its doing the propagation. There is a caveat when using the propagation on a Query Folder.   While a propagation on a regular folder will update all of the items within that folder, a Query Folder propagation will only update the first 50 items.  So you may need to run it multiple times depending on the size...and have the query exclude the items as they get updated. One extra note...Framework Folders is offered as the default folder architecture in the PS5 release of WebCenter Content.  But if you are using WebCenter Content integrated with another product that makes use of folders (WebCenter Portal/Spaces, Fusion Applications, Primavera, etc), you'll need to continue using Folders_g until they are updated to use the new folders.

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  • surviveFocusChange=true

    - by Geertjan
    Here's a very cool thing that I keep forgetting about but that Jesse reminded me of in the recent blog entries on Undo/Redo: "surviveFocusChange=true". Look at the screenshot below. You see two windows with a toolbar button. The toolbar button is enabled whenever an object named "Bla" is in the Lookup. The "Demo" window has a "Bla" object in its Lookup and hence the toolbar button is enabled when the focus is in the "Demo" window, as shown below: Now the focus is in the "Output" window, which does not have a "Bla" object in its Lookup and hence the button is disabled: However, there are scenarios where you might like the button to remain enabled even when the focus changes. (One such scenario is the Undo/Redo scenario in this blog a few days ago, i.e., even when the Properties window has the focus the Undo/Redo buttons should be enabled.) Here you can see that the button is enabled even though the focus has switched to the "Output" window: How to achieve this? Well, you need to register your Action to have "surviveFocusChange" set to "true". It is, by default, set to "false": import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import org.openide.awt.ActionID; import org.openide.awt.ActionReference; import org.openide.awt.ActionReferences; import org.openide.awt.ActionRegistration; import org.openide.util.NbBundle.Messages; @ActionID(category = "File", id = "org.mymodule.BlaAction") @ActionRegistration(surviveFocusChange=true, iconBase = "org/mymodule/Datasource.gif", displayName = "#CTL_BlaAction") @ActionReferences({     @ActionReference(path = "Toolbars/Bla", position = 0) }) @Messages("CTL_BlaAction=Bla") public final class BlaAction implements ActionListener {     private final Bla context;     public BlaAction(Bla context) {         this.context = context;     }     @Override     public void actionPerformed(ActionEvent ev) {         // TODO use context     } } That's all. Now folders and files will be created in the NetBeans Platform filesystem from the annotations above when the module is compiled such that the NetBeans Platform will automatically keep the button enabled even when the user switches focus to a window that does not contain a "Bla" object in its Lookup. Hence, the same "Bla" object will remain available when switching from one window to another, until a new "Bla" object will be made available in the Lookup.

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  • Setup Convergence Address Book DisplayName Lookup

    - by user13332755
    At Convergence Address Book the default lookup for 'Display Name' is the LDAP attribute 'cn', which leads into confusion if you start to setup 'displayName' LDAP attributes for your users. LDAP User Entry with diaplyName attribute: This behavior can be controlled by the configuration file xlate-inetorgperson.xml. Change the default value of XPATH abperson\entry\displayname from 'cn' to 'displayName'. <convergence_deploy_location>/config/templates/ab/corp-dir/xlate-inetorgperson.xml Note: In case the user has no 'displayName' attribute in LDAP you might noticed '...' at the user entry, if found via 'mail' attribute.

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  • Identify memory leak in Java app

    - by Vincent Ma
    One important advantage of java is programer don't care memory management and GC handle it well. Maybe this is one reason why java is more popular. As Java programer you real dont care it? After you meet Out of memory you will realize it it’s not true. Java GC and memory is big topic you can get some information in here Today just let me show how to identify memory leak quickly. Let quickly review demo java code, it’s one kind of memory leak in our code, using static collection and always add some object. import java.util.ArrayList;import java.util.List; public class MemoryTest { public static void main(String[] args) { new Thread(new MemoryLeak(), "MemoryLeak").start(); }} class MemoryLeak implements Runnable { public static List<Integer> leakList = new ArrayList<Integer>(); public void run() { int num =0; while(true) { try { Thread.sleep(1); } catch (InterruptedException e) { } num++; Integer i = new Integer(num); leakList.add(i); } }} run it with java -verbose:gc -XX:+PrintGCDetails -Xmx60m -XX:MaxPermSize=160m MemoryTest after about some minuts you will get Exception in thread "MemoryLeak" java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:2760) at java.util.Arrays.copyOf(Arrays.java:2734) at java.util.ArrayList.ensureCapacity(ArrayList.java:167) at java.util.ArrayList.add(ArrayList.java:351) at MemoryLeak.run(MemoryTest.java:25) at java.lang.Thread.run(Thread.java:619)Heap def new generation total 18432K, used 3703K [0x045e0000, 0x059e0000, 0x059e0000) eden space 16384K, 22% used [0x045e0000, 0x0497dde0, 0x055e0000) from space 2048K, 0% used [0x055e0000, 0x055e0000, 0x057e0000) to space 2048K, 0% used [0x057e0000, 0x057e0000, 0x059e0000) tenured generation total 40960K, used 40959K [0x059e0000, 0x081e0000, 0x081e0000) the space 40960K, 99% used [0x059e0000, 0x081dfff8, 0x081e0000, 0x081e0000) compacting perm gen total 12288K, used 2083K [0x081e0000, 0x08de0000, 0x10de0000) the space 12288K, 16% used [0x081e0000, 0x083e8c50, 0x083e8e00, 0x08de0000)No shared spaces configured. OK let us quickly identify it using JProfile Download JProfile in here  Run JProfile and attach MemoryTest get largest size of  Objects in Memory View in here is Integer then select Integer and go to Heap Walker. get GC Graph for this object  Then you get detail code raise this issue quickly now.  That is enjoy it.

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  • Hold The Date: GlassFish Community Event and Party @ JavaOne 2012 - Sep 30

    - by arungupta
    A yearly tradition for the past 5 years (2007, 2008, 2009, 2010, 2011) is back again this year ... GlassFish Community Event is a gathering of GlassFish community members attending JavaOne. GlassFish Party is for everybody who are, or would like to be friends of GlassFish, in and around the San Francisco Bay Area. This year, again, both the events will be happening on the Sunday of JavaOne. The exact coordinates are a TBD but save the date while you are booking flights/hotels. GlassFish Community Event When: Sep 30, 11am - 1pm Where: TBD GlassFish Party When: Sep 30, 8pm - 10pm Where: The Thirsty Bear Note, a separate JavaOne registration is required to attend the community event. The party is open to everybody, and no JavaOne registration is required. RSVP details are still being worked upon and will be shared soon. 10 reasons to attend these events allows you to build your case with the management :-)

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  • Java Spotlight Episode 112: Joonas Lehiten on @Vaadin

    - by Roger Brinkley
    Interview with Joonas Lehtinen on Vaadin. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News Java Smart Metering video JavaFX for Tablets and Mobile survey on FXExperience Muliple JSR Migrating to the Latest JCP Version A number of JEPs added to  JDK 8 features and JDK 8 Milestones Adopt-a-JSR for Java EE 7 Events Dec 14-15, IndicThreads, Pune, India Dec 20, 9:30am JCP Spec Lead Call December on Developing a TCK Jan 15-16, JCP EC Face to Face Meeting, West Coast USA Feature InterviewJoonas Lehtinen started the development of Vaadin, a Java-based open source framework for building business-oriented Rich Internet Applications. He has been developing applications for the web since 1995 with a strong focus on Ajax and Java. He is also the founder and CEO of the company behind the Vaadin framework. What’s Cool Hinkmond Wong’s work with RasberryPI and Java Embedded GPIO Collaborative Whiteboard using WebSocket

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  • How to set default Java version?

    - by Matteo
    I have followed all the instructions stated at this question, but am encountering some problems with the last part of it. I actually have version 6.22 of java and would like to update to version 6.30. So after moving the extracted directory java-6-oracle into /usr/lib/jvm I do not know what to do, since the script that is pointed out in the answer above updates from java 5 to java 6. For sake of clearness here is output if I do an ls in dir /usr/lib/jvm: matteo@matteo-ThinkPad-SL:/usr/lib/jvm$ ls -l total 8 lrwxrwxrwx 1 root root 14 2011-07-12 15:18 default-java - java-6-openjdk lrwxrwxrwx 1 root root 14 2011-07-12 12:19 java-1.6.0-openjdk - java-6-openjdk drwxr-xr-x 10 root root 4096 2012-04-12 12:06 java-6.31-oracle drwxr-xr-x 7 root root 4096 2012-02-24 14:43 java-6-openjdk What should I do now?

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  • Announcing: General Availability of Demantra 7.3.1.4!

    - by user702295
    Announcing: General Availability of Demantra 7.3.1.4! This new release brings important usability upgrades and key requested customer enhancements. Key features released in Demantra 7.3.1.4: - Improved user interface - Improved mobile support - Embed Demantra-Anywhere in Advanced Planning Command Center - Aggregate work orders for Asset Intensive Planning Additionally: - Demantra 7.3.1.4 is certified with VCP 12.1.3.8 only. Availability via patch 14405087.

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  • forEach and Facelets - a bugfarm just waiting for harvest

    - by Duncan Mills
    An issue that I've encountered before and saw again today seems worthy of a little write-up. It's all to do with a subtle yet highly important difference in behaviour between JSF 2 running with JSP and running on Facelets (.jsf pages). The incident I saw today can be seen as a report on the ADF EMG bugzilla (Issue 53) and in a blog posting by Ulrich Gerkmann-Bartels who reported the issue to the EMG. Ulrich's issue nicely shows how tricky this particular gochya can be. On the surface, the problem is squarely the fault of MDS but underneath MDS is, in fact, innocent. To summarize the problem in a simpler testcase than Ulrich's example, here's a simple fragment of code: <af:forEach var="item" items="#{itemList.items}"> <af:commandLink id="cl1" text="#{item.label}" action="#{item.doAction}"  partialSubmit="true"/> </af:forEach> Looks innocent enough right? We see a bunch of links printed out, great. The issue here though is the id attribute. Logically you can kind of see the problem. The forEach loop is creating (presumably) multiple instances of the commandLink, but only one id is specified - cl1. We know that IDs have to be unique within a JSF component tree, so that must be a bad thing?  The problem is that JSF under JSP implements some hacks when the component tree is generated to transparently fix this problem for you. Behind the scenes it ensures that each instance really does have a unique id. Really nice of it to do so, thank you very much. However, (you could see this coming), the same is not true when running with Facelets  (this is under 11.1.2.n)  in that case, what you put for the id is what you get, and JSF does not mess around in the background for you. So you end up with a component tree that contains duplicate ids which are only created at runtime.  So subtle chaos can ensue.  The symptoms are wide and varied, from something pretty obscure such as the combination Ulrich uncovered, to something as frustrating as your ActionListener just not being triggered. And yes I've wasted hours on just such an issue.  The Solution  Once you're aware of this one it's really simple to fix it, there are two options: Remove the id attribute on components that will cause some kind of submission within the forEach loop altogether and let JSF do the right thing in generating them. Then you'll be assured of uniqueness. Use the var attribute of the loop to generate a unique id for each child instance.  for example in the above case: <af:commandLink id="cl1_#{item.index}" ... />.  So one to watch out for in your upgrades to JSF 2 and one perhaps, for your coding standards today to prepare you for. For completeness, here's the reference to the underlying JSF issue that's at the heart of this: JAVASERVERFACES-1527

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  • JSF 2.2 Update from Ed Burns

    - by arungupta
    In a recent interview the JavaServer Faces specification lead, Ed Burns, gave an update on JSF 2.2. This is a required component of the Java EE 7 platform. The work is expected to wrap up by CY 2012 and the schedule is publicly available. The interview provide an update on how Tenant Scope from CDI and multi-templating will be included. It also provide details on which HTML 5 content categories will be addressed. The EG discussions are mirrored at jsr344-experts@javaserverfaces-spec-public. You can also participate in the discussion by posting a message to users@javaserverfaces-spec-public. All the mailing lists are open for subscription anyway and JIRA for spec provide more details about features targeted for the upcoming release. A blog at J-Development provide complete details about the new features coming in this version. And an Early Draft of the specification is available for some time now.

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  • InnoDB Compression Improvements in MySQL 5.6

    - by Inaam Rana
    MySQL 5.6 comes with significant improvements for the compression support inside InnoDB. The enhancements that we'll talk about in this piece are also a good example of community contributions. The work on these was conceived, implemented and contributed by the engineers at Facebook. Before we plunge into the details let us familiarize ourselves with some of the key concepts surrounding InnoDB compression. In InnoDB compressed pages are fixed size. Supported sizes are 1, 2, 4, 8 and 16K. The compressed page size is specified at table creation time. InnoDB uses zlib for compression. InnoDB buffer pool will attempt to cache compressed pages like normal pages. However, whenever a page is actively used by a transaction, we'll always have the uncompressed version of the page as well i.e.: we can have a page in the buffer pool in compressed only form or in a state where we have both the compressed page and uncompressed version but we'll never have a page in uncompressed only form. On-disk we'll always only have the compressed page. When both compressed and uncompressed images are present in the buffer pool they are always kept in sync i.e.: changes are applied to both atomically. Recompression happens when changes are made to the compressed data. In order to minimize recompressions InnoDB maintains a modification log within a compressed page. This is the extra space available in the page after compression and it is used to log modifications to the compressed data thus avoiding recompressions. DELETE (and ROLLBACK of DELETE) and purge can be performed without recompressing the page. This is because the delete-mark bit and the system fields DB_TRX_ID and DB_ROLL_PTR are stored in uncompressed format on the compressed page. A record can be purged by shuffling entries in the compressed page directory. This can also be useful for updates of indexed columns, because UPDATE of a key is mapped to INSERT+DELETE+purge. A compression failure happens when we attempt to recompress a page and it does not fit in the fixed size. In such case, we first try to reorganize the page and attempt to recompress and if that fails as well then we split the page into two and recompress both pages. Now lets talk about the three major improvements that we made in MySQL 5.6.Logging of Compressed Page Images:InnoDB used to log entire compressed data on the page to the redo logs when recompression happens. This was an extra safety measure to guard against the rare case where an attempt is made to do recovery using a different zlib version from the one that was used before the crash. Because recovery is a page level operation in InnoDB we have to be sure that all recompress attempts must succeed without causing a btree page split. However, writing entire compressed data images to the redo log files not only makes the operation heavy duty but can also adversely affect flushing activity. This happens because redo space is used in a circular fashion and when we generate much more than normal redo we fill up the space much more quickly and in order to reuse the redo space we have to flush the corresponding dirty pages from the buffer pool.Starting with MySQL 5.6 a new global configuration parameter innodb_log_compressed_pages. The default value is true which is same as the current behavior. If you are sure that you are not going to attempt to recover from a crash using a different version of zlib then you should set this parameter to false. This is a dynamic parameter.Compression Level:You can now set the compression level that zlib should choose to compress the data. The global parameter is innodb_compression_level - the default value is 6 (the zlib default) and allowed values are 1 to 9. Again the parameter is dynamic i.e.: you can change it on the fly.Dynamic Padding to Reduce Compression Failures:Compression failures are expensive in terms of CPU. We go through the hoops of recompress, failure, reorganize, recompress, failure and finally page split. At the same time, how often we encounter compression failure depends largely on the compressibility of the data. In MySQL 5.6, courtesy of Facebook engineers, we have an adaptive algorithm based on per-index statistics that we gather about compression operations. The idea is that if a certain index/table is experiencing too many compression failures then we should try to pack the 16K uncompressed version of the page less densely i.e.: we let some space in the 16K page go unused in an attempt that the recompression won't end up in a failure. In other words, we dynamically keep adding 'pad' to the 16K page till we get compression failures within an agreeable range. It works the other way as well, that is we'll keep removing the pad if failure rate is fairly low. To tune the padding effort two configuration variables are exposed. innodb_compression_failure_threshold_pct: default 5, range 0 - 100,dynamic, implies the percentage of compress ops to fail before we start using to padding. Value 0 has a special meaning of disabling the padding. innodb_compression_pad_pct_max: default 50, range 0 - 75, dynamic, the  maximum percentage of uncompressed data page that can be reserved as pad.

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  • Jung Meets the NetBeans Platform

    - by Geertjan
    Here's a small Jung diagram in a NetBeans Platform application: And the code, copied directly from the Jung 2.0 Tutorial:  public final class JungTopComponent extends TopComponent { public JungTopComponent() { initComponents(); setName(Bundle.CTL_JungTopComponent()); setToolTipText(Bundle.HINT_JungTopComponent()); setLayout(new BorderLayout()); Graph sgv = getGraph(); Layout<Integer, String> layout = new CircleLayout(sgv); layout.setSize(new Dimension(300, 300)); BasicVisualizationServer<Integer, String> vv = new BasicVisualizationServer<Integer, String>(layout); vv.setPreferredSize(new Dimension(350, 350)); add(vv, BorderLayout.CENTER); } public Graph getGraph() { Graph<Integer, String> g = new SparseMultigraph<Integer, String>(); g.addVertex((Integer) 1); g.addVertex((Integer) 2); g.addVertex((Integer) 3); g.addEdge("Edge-A", 1, 2); g.addEdge("Edge-B", 2, 3); Graph<Integer, String> g2 = new SparseMultigraph<Integer, String>(); g2.addVertex((Integer) 1); g2.addVertex((Integer) 2); g2.addVertex((Integer) 3); g2.addEdge("Edge-A", 1, 3); g2.addEdge("Edge-B", 2, 3, EdgeType.DIRECTED); g2.addEdge("Edge-C", 3, 2, EdgeType.DIRECTED); g2.addEdge("Edge-P", 2, 3); return g; } And here's what someone who attended a NetBeans Platform training course in Poland has done with Jung and the NetBeans Platform: The source code for the above is on Git: git://gitorious.org/j2t/j2t.git

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  • Doing a P2V in OVM 3.0.3

    - by Steen Schmidt
    The other day I was talking to a customer about how you can do a P2V in OVM. I had already written about this topic earlier in my Blog and there was also some good documentation on the topic on how you do this. But what about seing the whole process from start to end, so I have include a link to a demo on the topic. Here is demo that has been divide into three steps: Step 1. Taget System,   Step 2. Import into OVM, and    Step 3. Use the new Template.

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  • Java SE 7 Developer Preview Release - Download Now!

    - by ruma.sanyal
    The JDK7 Developer Preview Release is now available for rigorous community testing. But time is running out! The latest build is feature complete, stable and ready to roll - so download, test and report bugs now. Let us know what you think. If you report a bug in the JDK 7 developer preview before April 4th, the Java product team will sing your praises on the Java SE 7 Honor Role. PLUS... we will send you some Java swag. We'll read, evaluate, and act on all feedback received via the usual bug-reporting channel. Bugs reported later on might not get ?xed in time for the initial release, so if you want to be a contributor to Java SE 7 do it before the April deadline.

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