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  • How to simulate an unhandled exception in Java

    - by Martin Wiboe
    Hi, I am creating some multi-threaded code, and I have created a JobDispatcher class that creates threads. I want this object to handle any unhandled exceptions in the worker threads, and so I am using Thread.setUncaughtExceptionHandler(this); Now, I would like to test this functionality - how can I generate an unhandled exception in the run() method of my worker object? Thanks, Martin

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  • How can an IBM WebSphere MQ's Queue Manager's local queues be enumerated?

    - by Jean-Paul Calderone
    I'm trying to write a simple tool for monitoring the state of a Queue Manager. One of the things I'd like to monitor is the current queue depth of each queue. I haven't been able to find a way to programmatically enumerate all of the queues on a particular Queue Manager, though. Do any of the MQ APIs provide this functionality? I'd prefer to do this with C, but if it's only possible with another language's bindings, I'd at least like to know that.

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  • python multithreading for dummies

    - by albruno
    trying to find a simple example that clearly shows a single task being divided for multi-threading. Quite frankly... many of the examples are overly sophisticated thus.... making the flow tougher to play with... anyone care to share their breakthrough sample or point to an example? As well, what is the best docs? many google lookups are too specific (for me at this stage) Thanks in advance.

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  • Heap Consistency Checking on Embedded System

    - by l.thee.a
    I get a crash like this: #0 0x2c58def0 in raise () from /lib/libpthread.so.0 #1 0x2d9b8958 in abort () from /lib/libc.so.0 #2 0x2d9b7e34 in __malloc_consolidate () from /lib/libc.so.0 #3 0x2d9b6dc8 in malloc () from /lib/libc.so.0 I guess it is a heap corruption issue. uclibc does not have mcheck/mprobe. Valgrind does not seem to MIPS support and my app (which is multi-threaded) depends on hw specific drivers. Any suggestions to check the consistency of the heap and to detect corruption?

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  • in_array() and multidimensional array

    - by lauthiamkok
    I use in_array() to check whether a value exists in an array like below, $a = array("Mac", "NT", "Irix", "Linux"); if (in_array("Irix", $a)) { echo "Got Irix"; } //print_r($a); but what about an multidimensional array (below) - how can I check that value whether it exists in the multi-array? $b = array(array("Mac", "NT"), array("Irix", "Linux")); print_r($b); or I shouldn't be using in_array() when comes to the multidimensional array?

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  • How can I decode the boost library naming?

    - by Sorin Sbarnea
    I tried to find out that gd means in boost library name and I only found two other people looking for the same thing. I suppose it should be a place where this is clearly documented and I would like to find it. So far I found: mt - multitheaded, get it with threading=multi gd - ??? s - ??? sgd - ???

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  • Access to the registry key 'Global' is denied.

    - by Vivek Rathore
    While giving permissions to the 'defaultAppPool' user I am getting the message 'There is no such global user or group: DefaultAppPool.' Can anyone help me here! However, using command 'net localgroup "Performance Monitor Users" DefaultAppPool /add' I am able to resolve the error but i am facing this problem in Windows Server 2003/IIS 6.0. Here, I am always prompted as 'There is no such global user or group: DefaultAppPool.' I have also added the 'Network Service' but no avail.

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  • Node.js or Erlang

    - by gotts
    I really like these tools when it comes to the concurrency level it can handle. Erlang looks like much more stable solution but requires much more learning and a lot of diving into functional language paradigm. And it looks like Erlang makes it much better when it comes to multi cores CPUs(fix me if I'm wrong). But which should I choose? Which one is better in the short/long term perspective?

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  • How do I prove I should put a table of values in source code instead of a database table?

    - by FastAl
    <tldr>looking for a reference to a book or other undeniably authoritative source that gives reasons when you should choose a database vs. when you should choose other storage methods. I have provided an un-authoritative list of reasons about 2/3 of the way down this post.</tldr> I have a situation at my company where a database is being used where it would be better to use another solution (in this case, an auto-generated piece of source code that contains a static lookup table, searched by binary sort). Normally, a database would be an OK solution even though the problem does not require a database, e.g, none of the elements of ACID are needed, as it is read-only data, updated about every 3-5 years (also requiring other sourcecode changes), and fits in memory, and can be keyed into via binary search (a tad faster than db, but speed is not an issue). The problem is that this code runs on our enterprise server, but is shared with several PC platforms (some disconnected, some use a central DB, etc.), and parts of it are managed by multiple programming units, parts by the DBAs, parts even by mathematicians in another department, etc. These hit their own platform’s version of their databases (containing their own copy of the static data). What happens is that every implementation, every little change, something different goes wrong. There are many other issues as well. I can’t even use a flatfile, because one mode of running on our enterprise server does not have permission to read files (only databases, and of course, its own literal storage, e.g., in-source table). Of course, other parts of the system use databases in proper, less obscure manners; there is no problem with those parts. So why don’t we just change it? I don’t have administrative ability to force a change. But I’m affected because sometimes I have to help fix the problems, but mostly because it causes outages and tons of extra IT time by other programmers and d*mmit that makes me mad! The reason neither management, nor the designers of the system, can see the problem is that they propose a solution that won’t work: increase communication; implement more safeguards and standards; etc. But every time, in a different part of the already-pared-down but still multi-step processes, a few different diligent, hard-working, top performing IT personnel make a unique subtle error that causes it to fail, sometimes after the last round of testing! And in general these are not single-person failures, but understandable miscommunications. And communication at our company is actually better than most. People just don't think that's the case because they haven't dug into the matter. However, I have it on very good word from somebody with extensive formal study of sociology and psychology that the relatively small amount of less-than-proper database usage in this gigantic cross-platform multi-source, multi-language project is bureaucratically un-maintainable. Impossible. No chance. At least with Human Beings in the loop, and it can’t be automated. In addition, the management and developers who could change this, though intelligent and capable, don’t understand the rigidity of this ‘how humans are’ issue, and are not convincible on the matter. The reason putting the static data in sourcecode will solve the problem is, although the solution is less sexy than a database, it would function with no technical drawbacks; and since the sharing of sourcecode already works very well, you basically erase any database-related effort from this section of the project, along with all the drawbacks of it that are causing problems. OK, that’s the background, for the curious. I won’t be able to convince management that this is an unfixable sociological problem, and that the real solution is coding around these limits of human nature, just as you would code around a bug in a 3rd party component that you can’t change. So what I have to do is exploit the unsuitableness of the database solution, and not do it using logic, but rather authority. I am aware of many reasons, and posts on this site giving reasons for one over the other; I’m not looking for lists of reasons like these (although you can add a comment if I've miss a doozy): WHY USE A DATABASE? instead of flatfile/other DB vs. file: if you need... Random Read / Transparent search optimization Advanced / varied / customizable Searching and sorting capabilities Transaction/rollback Locks, semaphores Concurrency control / Shared users Security 1-many/m-m is easier Easy modification Scalability Load Balancing Random updates / inserts / deletes Advanced query Administrative control of design, etc. SQL / learning curve Debugging / Logging Centralized / Live Backup capabilities Cached queries / dvlp & cache execution plans Interleaved update/read Referential integrity, avoid redundant/missing/corrupt/out-of-sync data Reporting (from on olap or oltp db) / turnkey generation tools [Disadvantages:] Important to get right the first time - professional design - but only b/c it's meant to last s/w & h/w cost Usu. over a network, speed issue (best vs. best design vs. local=even then a separate process req's marshalling/netwk layers/inter-p comm) indicies and query processing can stand in the way of simple processing (vs. flatfile) WHY USE FLATFILE: If you only need... Sequential Row processing only Limited usage append only (no reading, no master key/update) Only Update the record you're reading (fixed length recs only) Too big to fit into memory If Local disk / read-ahead network connection Portability / small system Email / cut & Paste / store as document by novice - simple format Low design learning curve but high cost later WHY USE IN-MEMORY/TABLE (tables, arrays, etc.): if you need... Processing a single db/ff record that was imported Known size of data Static data if hardcoding the table Narrow, unchanging use (e.g., one program or proc) -includes a class that will be shared, but encapsulates its data manipulation Extreme speed needed / high transaction frequency Random access - but search is dependent on implementation Following are some other posts about the topic: http://stackoverflow.com/questions/1499239/database-vs-flat-text-file-what-are-some-technical-reasons-for-choosing-one-over http://stackoverflow.com/questions/332825/are-flat-file-databases-any-good http://stackoverflow.com/questions/2356851/database-vs-flat-files http://stackoverflow.com/questions/514455/databases-vs-plain-text/514530 What I’d like to know is if anybody could recommend a hard, authoritative source containing these reasons. I’m looking for a paper book I can buy, or a reputable website with whitepapers about the issue (e.g., Microsoft, IBM), not counting the user-generated content on those sites. This will have a greater change to elicit a change that I’m looking for: less wasted programmer time, and more reliable programs. Thanks very much for your help. You win a prize for reading such a large post!

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  • CVS tools for repo monitoring on windows?

    - by Bjorn J
    I sometime use the very simple but effective svncommitmonitor, http://tools.tortoisesvn.net/CommitMonitor to monitor activity. It's easy to see in the sys tray on a windows box and I've become used to it by now. So, is there a similar/identical tool for CVS. Some googling and to my surprise I couldn't find one. Any tips?

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  • WebSockets authentication

    - by Tomi
    What are the possible ways to authenticate user when websocket connection is used? Example scenario: Web based multi-user chat application through encrypted websocket connection. How can I ensure (or guarantee) that each connection in this application belongs to certain authenticated user and "can't be" exploited by false user impersonation during the connection.

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  • Finding key Solr performance metrics

    - by Mike Malloy
    To improve performance of Solr find your slowest searches, monitor query results, cache hit rate and cache size, document cache and filter cache; find problems with Solr update handlers by tracking index operations and document operations. There is a tool from New Relic which may help. http://www.newrelic.com/solr.html

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  • Splitting TIFF Files on different formats using .NET

    - by Jojo
    HI All, I have below code to extract a single page from a multi-paged TIFF file. The problem is, the input file is in CCITT Group 4 compression however the output compression is LZW. Can .NET outputs TIFF files other than this compression? FileStream fileStream = File.Open(outputFileName, FileMode.Create, FileAccess.ReadWrite); sourceImage.SelectActiveFrame(firstFrameDimension, pageNumbers[i]); sourceImage.Save(fileStream, ImageFormat.Tiff); fileStream.Close();

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  • How to use width relative from height?

    - by TRAVA
    I need to make 3:4 window, where 3 is 75% of screen. How could i set width? Like if i have 100px height and 10000000000000px width monitor, than i shold have 75:100px window. I heard that it could be done with the help of Javascript.

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  • Online Collaborative Schema Design (leverage google docs?)

    - by AK
    I'm looking for an online, collaborative schema designer. It's important that it can handle revisions (history of changes). This looks cool, and I could host it on a server - but doesn't look like it would handle multi-user: http://ondras.zarovi.cz/sql/demo/ Currently we're doing a lot of design collaboration on google docs/spreadsheets. Has anyone had any success using google spreadsheet for schema design? Even if there were just a gadget for drawing lines/connections, I might give Google Docs a shot.

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  • Call WCF service host directly

    - by Steven
    I'm hosting a WCF service inside a winform app. I want to monitor when somebody calls the service to a textbox on the form like: 2:23 Method X called params(x, y) 2:24 Method Y called params(z) I am using a service host for WCF and inside my concrete class I have created some delegates and events. I just cant seem to wire the events up because my object is of type ServiceHost not my object. Any help

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  • convert perl map with multiple key to c++

    - by YY
    I want to convert a code from perl to c++, and my problem is multi key map in perl! example: perl: $address{name}{familyName} = $someAddress; and keys are not unique. I want similar data structure in c++ using map or ...!? also I want to search and obtain values with first key for example I want such %keys{name} in c++ .

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  • How does Java handle multithreading?

    - by badcodenotreat
    How does Java decide which core to assign a thread or a process? Is there any way to control that? to prevent two large threads from executing on the same core? Basically what I am asking is for further information on either how multi-threading works in Java, or how to control it within Java.

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  • Easiest way to create drop down with database generated options

    - by aarontb
    I'm trying to build a multi-level "game". A randomly generated option (Option1) will trigger other options in a drop down (Option2)...the options in the new drop down will be directly related the to Option1. Option2 will then trigger another drop down with info directly related to Option2 and so forth until reaching OptionEnd...any suggestions, preferably SQL and PHP. Thanks...yeah, I'm a n00b.

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