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  • Is throwing an error in unpredictable subclass-specific circumstances a violation of LSP?

    - by Motti Strom
    Say, I wanted to create a Java List<String> (see spec) implementation that uses a complex subsystem, such as a database or file system, for its store so that it becomes a simple persistent collection rather than an basic in-memory one. (We're limiting it specifically to a List of Strings for the purposes of discussion, but it could extended to automatically de-/serialise any object, with some help. We can also provide persistent Sets, Maps and so on in this way too.) So here's a skeleton implementation: class DbBackedList implements List<String> { private DbBackedList() {} /** Returns a list, possibly non-empty */ public static getList() { return new DbBackedList(); } public String get(int index) { return Db.getTable().getRow(i).asString(); // may throw DbExceptions! } // add(String), add(int, String), etc. ... } My problem lies with the fact that the underlying DB API may encounter connection errors that are not specified in the List interface that it should throw. My problem is whether this violates Liskov's Substitution Principle (LSP). Bob Martin actually gives an example of a PersistentSet in his paper on LSP that violates LSP. The difference is that his newly-specified Exception there is determined by the inserted value and so is strengthening the precondition. In my case the connection/read error is unpredictable and due to external factors and so is not technically a new precondition, merely an error of circumstance, perhaps like OutOfMemoryError which can occur even when unspecified. In normal circumstances, the new Error/Exception might never be thrown. (The caller could catch if it is aware of the possibility, just as a memory-restricted Java program might specifically catch OOME.) Is this therefore a valid argument for throwing an extra error and can I still claim to be a valid java.util.List (or pick your SDK/language/collection in general) and not in violation of LSP? If this does indeed violate LSP and thus not practically usable, I have provided two less-palatable alternative solutions as answers that you can comment on, see below. Footnote: Use Cases In the simplest case, the goal is to provide a familiar interface for cases when (say) a database is just being used as a persistent list, and allow regular List operations such as search, subList and iteration. Another, more adventurous, use-case is as a slot-in replacement for libraries that work with basic Lists, e.g if we have a third-party task queue that usually works with a plain List: new TaskWorkQueue(new ArrayList<String>()).start() which is susceptible to losing all it's queue in event of a crash, if we just replace this with: new TaskWorkQueue(new DbBackedList()).start() we get a instant persistence and the ability to share the tasks amongst more than one machine. In either case, we could either handle connection/read exceptions that are thrown, perhaps retrying the connection/read first, or allow them to throw and crash the program (e.g. if we can't change the TaskWorkQueue code).

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  • Is there or why not having a ruby technology specification similar to Java's JSR?

    - by romeu.hcf
    I think on a community portal where specifications are made, documented and specified to reference libraries and systems implementation. An example: A specification for Message Queue where redis clients, for instance, could implement it and where the libraries could be validated by the specification's test suite. Redic, redis-rb, hiredis, redis-connection-pool, redis-namespace should all implement this specification. This way, being easily replaced.

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  • Mp3s synced on Ubuntu One not showing up under artist or album

    - by Simon
    I have synced approximately 10GB of music with U1 over the last 48 hours. Nearly everything appears OK: the songs are tagged correctly, I can queue and play them. However, with the exception of a few that I uploaded first, all of them don't appear under Artist or Album and I can't use the search to find them. I can only find them under Song. Am I just being impatient and U1 just needs time to index these mp3s, or is something wrong?

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  • What makes games responsive to user input?

    - by zaftcoAgeiha
    Many games have been praised for its responsive gameplay, where each user action input correspond to a quick and precise character movement (eg: super meat boy, shank...) What makes those games responsive? and what prevents other games from achieving the same? How much of it is due to the game framework used to queue mouse/keyboard events and render/update the game and how much is attributed to better coding?

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  • Microsoft Interview Preparation

    - by Manish
    I have 8 years of java background. Need help in identifying topics I need to prepare for Microsoft interview. I need to know how many rounds Microsoft will have and what all things these rounds consist of. I have identified the following topics. Please let me know if I need to prepare anything else as well. Arrays Linked Lists Recursion Stacks Queue Trees Graph -- What all I should prepare here Dynamic Programming -- again what all I need to prepare Sorting, Searching String Algos

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  • How can I achieve strong typing with a component messaging system?

    - by Vaughan Hilts
    I'm looking at implementing a messaging system in my entity component system. I've deduced that I can use an event / queue for passing messages, but right now, I just use a generic object and cast out the data I want. I also considered using a dictionary. I see a lot of information on this, but they all involve a lot of casting and guessing. Is there any way to do this elegantly and keep strong typing on my messages?

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  • Criteria for selecting timeout value?

    - by stijn
    Situation: a piece of software reads frames of data from a file in a seperate thread and puts it on a queue, emptied by another thread. That second thread periodically checks on the queue and fails rather gracefully, by showing an error message stating the read timed out, if no data is available within a certain amount of time. Initially this timeout was set to 200mSec. There was no real reasoning behind that constant though, but it worked fine. We measured on a couple of machines and for large data frames, larger than what would be used by customers, a read took like 20mSec whith no other load on the machine. However one customer now gets timeout errors now and then (on the second try all is fine, probably the file is in cache or the virus scanner leaves it alone). The programmers are like 'well, yeah, but that customer's machine is full of cruft, virus scanners, tons of unneeded background processes etc'. Of course the customer is like 'hey this should just work, shouldn't it'? While the programers have a point, since the software is heavy enough to validate the need for a dedicated machine, that does not make the customer happy. Increasing the timeout to 2 seconds, for example, solves the problem. But I'd like to make a proper decision now instead of just randomly pick some magic constant that is probably ok in 99% of cases. What criteria should be used for that? We could just pick a large number, but that feels wrong. (and then we end up with a program that has the horrible bahaviour of hanging when trying to read from a disconnected drive for instance, whereas we'd rather make it show an error right away). Or we could make the timeout value a user setting, but then we need to ducument it clearly and even then not all customers are tech savy enough to really understand what it does. Or we could try and wait until another customer reports timeouts and increase the value again. And again. Until we find something ok for 99.99% of the cases.. Any good practice for this type of situation?

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  • Why is MaybeChannelBound callable?

    - by William Payne
    The Queue class in the python kombu library inherits from MaybeChannelBound, which in turn implements the call method (making it callable). The call() method itself is a thin wrapper around the bind() method. It is not clear why this was done, as calling the bind() method seems (to my simple mind, at least) to be clearer and more descriptive of the intent of the function. Why would somebody use the call() method in a situation like this?

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  • XNA move from start position to target position exactly in 3D

    - by robasaurus
    If I have a list of positions that map out a path a character should follow. What would be the best way to move at a constant speed to each position making sure the character lands exactly at each position before moving onto the next? For example the character is at position A, we then queue up position B and position C. The character cannot move towards position C until it reaches position B exactly. It would be great if the solution worked at slower frame rates/update speeds as well.

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  • Question about design

    - by lukeluke
    Two fast questions about two design decisions: Suppose that you are checking collisions between game elements. When you find a collision between object 1 and object 2, do you play immediately a sound effect or do you insert it in a list and, in a later a stage, do you process all sound effects? Same question as above for user input. When the user presses key 'keypad left' do you insert the event in a queue and process it later or do you update character position immediately? Thx

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  • engine for responsive gameplay

    - by zaftcoAgeiha
    Many games have been praised for its responsive gameplay, where each user action input correspond to a quick and precise character movement (eg: super meat boy, shank...) What makes those games responsive? and what prevents other games from achieving the same? How much of it is due to the game framework used to queue mouse/keyboard events and render/update the game and how much is attributed to better coding?

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  • ????????WebLogic Server - Enterprise Grid Messaging |WebLogic Channel|??????

    - by ???02
    WebLogic Server????????????????????????????Enterprise Grid Messaging?????????? ?? ????????????????????????????????????????????????WebLogic Server?Java EE?JMS???JMS????????????JMS???????????????????????????????????????????????????????????????????????????????11gR1???Enterprise Grid Messaging????Oracle Advanced Queuing?Oracle RAC???????????????? ?????Enterprise Grid Messaging????????????????????????? ????¦WebLogic JMS????¦JMS??¦?????????¦?????????¦?????????????????¦Advanced Queue???? ???????????????????????????http://www.oracle.com/technetwork/jp/ondemand/application-grid/wls11g-egm-201107-otn-sc-439529-ja.pdf

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  • Best Practices for Handing over Legacy Code

    - by PersonalNexus
    In a couple of months a colleague will be moving on to a new project and I will be inheriting one of his projects. To prepare, I have already ordered Michael Feathers' Working Effectively with Legacy Code. But this books as well as most questions on legacy code I found so far are concerned with the case of inheriting code as-is. But in this case I actually have access to the original developer and we do have some time for an orderly hand-over. Some background on the piece of code I will be inheriting: It's functioning: There are no known bugs, but as performance requirements keep going up, some optimizations will become necessary in the not too distant future. Undocumented: There is pretty much zero documentation at the method and class level. What the code is supposed to do at a higher level, though, is well-understood, because I have been writing against its API (as a black-box) for years. Only higher-level integration tests: There are only integration tests testing proper interaction with other components via the API (again, black-box). Very low-level, optimized for speed: Because this code is central to an entire system of applications, a lot of it has been optimized several times over the years and is extremely low-level (one part has its own memory manager for certain structs/records). Concurrent and lock-free: While I am very familiar with concurrent and lock-free programming and have actually contributed a few pieces to this code, this adds another layer of complexity. Large codebase: This particular project is more than ten thousand lines of code, so there is no way I will be able to have everything explained to me. Written in Delphi: I'm just going to put this out there, although I don't believe the language to be germane to the question, as I believe this type of problem to be language-agnostic. I was wondering how the time until his departure would best be spent. Here are a couple of ideas: Get everything to build on my machine: Even though everything should be checked into source code control, who hasn't forgotten to check in a file once in a while, so this should probably be the first order of business. More tests: While I would like more class-level unit tests so that when I will be making changes, any bugs I introduce can be caught early on, the code as it is now is not testable (huge classes, long methods, too many mutual dependencies). What to document: I think for starters it would be best to focus documentation on those areas in the code that would otherwise be difficult to understand e.g. because of their low-level/highly optimized nature. I am afraid there are a couple of things in there that might look ugly and in need of refactoring/rewriting, but are actually optimizations that have been out in there for a good reason that I might miss (cf. Joel Spolsky, Things You Should Never Do, Part I) How to document: I think some class diagrams of the architecture and sequence diagrams of critical functions accompanied by some prose would be best. Who to document: I was wondering what would be better, to have him write the documentation or have him explain it to me, so I can write the documentation. I am afraid, that things that are obvious to him but not me would otherwise not be covered properly. Refactoring using pair-programming: This might not be possible to do due to time constraints, but maybe I could refactor some of his code to make it more maintainable while he was still around to provide input on why things are the way they are. Please comment on and add to this. Since there isn't enough time to do all of this, I am particularly interested in how you would prioritize.

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  • Oracle TimesTen In-Memory Database Performance on SPARC T4-2

    - by Brian
    The Oracle TimesTen In-Memory Database is optimized to run on Oracle's SPARC T4 processor platforms running Oracle Solaris 11 providing unsurpassed scalability, performance, upgradability, protection of investment and return on investment. The following demonstrate the value of combining Oracle TimesTen In-Memory Database with SPARC T4 servers and Oracle Solaris 11: On a Mobile Call Processing test, the 2-socket SPARC T4-2 server outperforms: Oracle's SPARC Enterprise M4000 server (4 x 2.66 GHz SPARC64 VII+) by 34%. Oracle's SPARC T3-4 (4 x 1.65 GHz SPARC T3) by 2.7x, or 5.4x per processor. Utilizing the TimesTen Performance Throughput Benchmark (TPTBM), the SPARC T4-2 server protects investments with: 2.1x the overall performance of a 4-socket SPARC Enterprise M4000 server in read-only mode and 1.5x the performance in update-only testing. This is 4.2x more performance per processor than the SPARC64 VII+ 2.66 GHz based system. 10x more performance per processor than the SPARC T2+ 1.4 GHz server. 1.6x better performance per processor than the SPARC T3 1.65 GHz based server. In replication testing, the two socket SPARC T4-2 server is over 3x faster than the performance of a four socket SPARC Enterprise T5440 server in both asynchronous replication environment and the highly available 2-Safe replication. This testing emphasizes parallel replication between systems. Performance Landscape Mobile Call Processing Test Performance System Processor Sockets/Cores/Threads Tps SPARC T4-2 SPARC T4, 2.85 GHz 2 16 128 218,400 M4000 SPARC64 VII+, 2.66 GHz 4 16 32 162,900 SPARC T3-4 SPARC T3, 1.65 GHz 4 64 512 80,400 TimesTen Performance Throughput Benchmark (TPTBM) Read-Only System Processor Sockets/Cores/Threads Tps SPARC T3-4 SPARC T3, 1.65 GHz 4 64 512 7.9M SPARC T4-2 SPARC T4, 2.85 GHz 2 16 128 6.5M M4000 SPARC64 VII+, 2.66 GHz 4 16 32 3.1M T5440 SPARC T2+, 1.4 GHz 4 32 256 3.1M TimesTen Performance Throughput Benchmark (TPTBM) Update-Only System Processor Sockets/Cores/Threads Tps SPARC T4-2 SPARC T4, 2.85 GHz 2 16 128 547,800 M4000 SPARC64 VII+, 2.66 GHz 4 16 32 363,800 SPARC T3-4 SPARC T3, 1.65 GHz 4 64 512 240,500 TimesTen Replication Tests System Processor Sockets/Cores/Threads Asynchronous 2-Safe SPARC T4-2 SPARC T4, 2.85 GHz 2 16 128 38,024 13,701 SPARC T5440 SPARC T2+, 1.4 GHz 4 32 256 11,621 4,615 Configuration Summary Hardware Configurations: SPARC T4-2 server 2 x SPARC T4 processors, 2.85 GHz 256 GB memory 1 x 8 Gbs FC Qlogic HBA 1 x 6 Gbs SAS HBA 4 x 300 GB internal disks Sun Storage F5100 Flash Array (40 x 24 GB flash modules) 1 x Sun Fire X4275 server configured as COMSTAR head SPARC T3-4 server 4 x SPARC T3 processors, 1.6 GHz 512 GB memory 1 x 8 Gbs FC Qlogic HBA 8 x 146 GB internal disks 1 x Sun Fire X4275 server configured as COMSTAR head SPARC Enterprise M4000 server 4 x SPARC64 VII+ processors, 2.66 GHz 128 GB memory 1 x 8 Gbs FC Qlogic HBA 1 x 6 Gbs SAS HBA 2 x 146 GB internal disks Sun Storage F5100 Flash Array (40 x 24 GB flash modules) 1 x Sun Fire X4275 server configured as COMSTAR head Software Configuration: Oracle Solaris 11 11/11 Oracle TimesTen 11.2.2.4 Benchmark Descriptions TimesTen Performance Throughput BenchMark (TPTBM) is shipped with TimesTen and measures the total throughput of the system. The workload can test read-only, update-only, delete and insert operations as required. Mobile Call Processing is a customer-based workload for processing calls made by mobile phone subscribers. The workload has a mixture of read-only, update, and insert-only transactions. The peak throughput performance is measured from multiple concurrent processes executing the transactions until a peak performance is reached via saturation of the available resources. Parallel Replication tests using both asynchronous and 2-Safe replication methods. For asynchronous replication, transactions are processed in batches to maximize the throughput capabilities of the replication server and network. In 2-Safe replication, also known as no data-loss or high availability, transactions are replicated between servers immediately emphasizing low latency. For both environments, performance is measured in the number of parallel replication servers and the maximum transactions-per-second for all concurrent processes. See Also SPARC T4-2 Server oracle.com OTN Oracle TimesTen In-Memory Database oracle.com OTN Oracle Solaris oracle.com OTN Oracle Database 11g Release 2 Enterprise Edition oracle.com OTN Disclosure Statement Copyright 2012, Oracle and/or its affiliates. All rights reserved. Oracle and Java are registered trademarks of Oracle and/or its affiliates. Other names may be trademarks of their respective owners. Results as of 1 October 2012.

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  • Stale statistics on a newly created temporary table in a stored procedure can lead to poor performance

    - by sqlworkshops
    When you create a temporary table you expect a new table with no past history (statistics based on past existence), this is not true if you have less than 6 updates to the temporary table. This might lead to poor performance of queries which are sensitive to the content of temporary tables.I was optimizing SQL Server Performance at one of my customers who provides search functionality on their website. They use stored procedure with temporary table for the search. The performance of the search depended on who searched what in the past, option (recompile) by itself had no effect. Sometimes a simple search led to timeout because of non-optimal plan usage due to this behavior. This is not a plan caching issue rather temporary table statistics caching issue, which was part of the temporary object caching feature that was introduced in SQL Server 2005 and is also present in SQL Server 2008 and SQL Server 2012. In this customer case we implemented a workaround to avoid this issue (see below for example for workarounds).When temporary tables are cached, the statistics are not newly created rather cached from the past and updated based on automatic update statistics threshold. Caching temporary tables/objects is good for performance, but caching stale statistics from the past is not optimal.We can work around this issue by disabling temporary table caching by explicitly executing a DDL statement on the temporary table. One possibility is to execute an alter table statement, but this can lead to duplicate constraint name error on concurrent stored procedure execution. The other way to work around this is to create an index.I think there might be many customers in such a situation without knowing that stale statistics are being cached along with temporary table leading to poor performance.Ideal solution is to have more aggressive statistics update when the temporary table has less number of rows when temporary table caching is used. I will open a connect item to report this issue.Meanwhile you can mitigate the issue by creating an index on the temporary table. You can monitor active temporary tables using Windows Server Performance Monitor counter: SQL Server: General Statistics->Active Temp Tables. The script to understand the issue and the workaround is listed below:set nocount onset statistics time offset statistics io offdrop table tab7gocreate table tab7 (c1 int primary key clustered, c2 int, c3 char(200))gocreate index test on tab7(c2, c1, c3)gobegin trandeclare @i intset @i = 1while @i <= 50000begininsert into tab7 values (@i, 1, ‘a’)set @i = @i + 1endcommit trangoinsert into tab7 values (50001, 1, ‘a’)gocheckpointgodrop proc test_slowgocreate proc test_slow @i intasbegindeclare @j intcreate table #temp1 (c1 int primary key)insert into #temp1 (c1) select @iselect @j = t7.c1 from tab7 t7 inner join #temp1 t on (t7.c2 = t.c1)endgodbcc dropcleanbuffersset statistics time onset statistics io ongo–high reads as expected for parameter ’1'exec test_slow 1godbcc dropcleanbuffersgo–high reads that are not expected for parameter ’2'exec test_slow 2godrop proc test_with_recompilegocreate proc test_with_recompile @i intasbegindeclare @j intcreate table #temp1 (c1 int primary key)insert into #temp1 (c1) select @iselect @j = t7.c1 from tab7 t7 inner join #temp1 t on (t7.c2 = t.c1)option (recompile)endgodbcc dropcleanbuffersset statistics time onset statistics io ongo–high reads as expected for parameter ’1'exec test_with_recompile 1godbcc dropcleanbuffersgo–high reads that are not expected for parameter ’2'–low reads on 3rd execution as expected for parameter ’2'exec test_with_recompile 2godrop proc test_with_alter_table_recompilegocreate proc test_with_alter_table_recompile @i intasbegindeclare @j intcreate table #temp1 (c1 int primary key)–to avoid caching of temporary tables one can create a constraint–but this might lead to duplicate constraint name error on concurrent usagealter table #temp1 add constraint test123 unique(c1)insert into #temp1 (c1) select @iselect @j = t7.c1 from tab7 t7 inner join #temp1 t on (t7.c2 = t.c1)option (recompile)endgodbcc dropcleanbuffersset statistics time onset statistics io ongo–high reads as expected for parameter ’1'exec test_with_alter_table_recompile 1godbcc dropcleanbuffersgo–low reads as expected for parameter ’2'exec test_with_alter_table_recompile 2godrop proc test_with_index_recompilegocreate proc test_with_index_recompile @i intasbegindeclare @j intcreate table #temp1 (c1 int primary key)–to avoid caching of temporary tables one can create an indexcreate index test on #temp1(c1)insert into #temp1 (c1) select @iselect @j = t7.c1 from tab7 t7 inner join #temp1 t on (t7.c2 = t.c1)option (recompile)endgoset statistics time onset statistics io ondbcc dropcleanbuffersgo–high reads as expected for parameter ’1'exec test_with_index_recompile 1godbcc dropcleanbuffersgo–low reads as expected for parameter ’2'exec test_with_index_recompile 2go

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  • Access to message queuing system is denied MSMQ?

    - by user1401694
    My problem is a little confusing. I have 2 servers (Windows Server 2008 R2) with MSMQ installed and I want to use Server B to consume a MessageQueue on Server A. When I try to Receive it always throws a message error: "Access to message queuing system is denied.". IP between them. Server A: 172.31.23.130 Server B: 172.31.23.195 FormatName:Direct=TCP:172.31.23.195\private$\queuesource (It's working for Sends) I can ping each server from the other; The firewall is disabled; The "queuesource" has Full Control to "Everyone", "Anonymous Logon", "Network", "Network Services"; Journal is disabled; Authentication is ok; The queue is Transactional. My code in .Net C# is basically like this: MessageQueue _sourceQueue = new MessageQueue(); _sourceQueue.Path = "FormatName:Direct=TCP:172.31.23.195\private$\queuesource"; _sourceQueue.Receive(); // << here throw an exception. Actually I'm using the Private Queue only to avoid Active Directory's problems. For example, if the server DNS fail all network fail. I don't know what do anymore.

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  • Host name or Domain not found

    - by hitesh-4259
    Hi I have installed amavis + postfix + spamassassin on centOS 5.4. The "/etc/hosts" file contains: 127.0.0.1 localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6 67.215.65.132 mail.sufalamtech.local mail When I am sending mail then, the following error is occured: Apr 8 06:20:53 mail sendmail[3229]: o380oqu7003229: from=root, size=62, class=0, nrcpts=1, msgid=<[email protected], relay=root@localhost Apr 8 06:20:53 mail postfix/smtpd[3230]: connect from mail.sufalamtech.local[127.0.0.1] Apr 8 06:20:53 mail sendmail[3229]: STARTTLS=client, relay=[127.0.0.1], version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-SHA, bits=256/256 Apr 8 06:20:54 mail postfix/smtpd[3230]: 5A53C1A5989: client=mail.sufalamtech.local[127.0.0.1], [email protected] Apr 8 06:20:54 mail postfix/cleanup[3238]: 5A53C1A5989: message-id=<[email protected] Apr 8 06:20:54 mail sendmail[3229]: o380oqu7003229: [email protected], ctladdr=root (0/0), delay=00:00:02, xdelay=00:00:01, mailer=relay, pri=30062, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (Ok: queued as 5A53C1A5989) Apr 8 06:20:54 mail postfix/qmgr[3107]: 5A53C1A5989: from=, size=587, nrcpt=1 (queue active) Apr 8 06:20:54 mail postfix/smtpd[3230]: disconnect from mail.sufalamtech.local[127.0.0.1] Apr 8 06:20:54 mail postfix/smtp[3240]: 5A53C1A5989: to=, relay=none, delay=0.63, delays=0.17/0.1/0.36/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=mail.sufalamtech.local type=A: Host not found) Apr 8 06:20:54 mail postfix/cleanup[3238]: E73C51A5987: message-id=<[email protected] Apr 8 06:20:54 mail postfix/qmgr[3107]: E73C51A5987: from=<, size=2594, nrcpt=1 (queue active) Apr 8 06:20:54 mail postfix/bounce[3241]: 5A53C1A5989: sender non-delivery notification: E73C51A5987 Apr 8 06:20:54 mail postfix/qmgr[3107]: 5A53C1A5989: removed Apr 8 06:20:55 mail postfix/local[3242]: E73C51A5987: to=, relay=local, delay=0.15, delays=0.02/0.1/0/0.03, dsn=2.0.0, status=sent (delivered to mailbox) Apr 8 06:20:55 mail postfix/local[3242]: warning: host not found: localhost Apr 8 06:20:55 mail postfix/qmgr[3107]: E73C51A5987: removed Apr 8 06:21:04 mail postfix/qmgr[3107]: warning: connect to transport amavis: No such file or directory Apr 8 06:22:04 mail postfix/qmgr[3107]: warning: connect to transport amavis: No such file or directory

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  • Looking for a help desk ticketing system..

    - by Dan
    Hi guys Im looking for a good help desk ticket solution. It must perform the following actions for it to be useful. It needs to have a single point of contact via email..e.g [email protected] If we recieve a telephone(or an email outside of the system) we need to be able to create a ticket as if had been added via the single point of contact, this needs to be done with ease in order to save time. Certain people within our organisation deal with certain customers, so if the email/ custom input support call as mentioned in bullet 2 is picked up as having a relationship with that certain person in our organisation it needs to be sent to them/put in their queue for them to work on. If a person is out of office or sick any tickets sent to them must be forwarded to somebody else or put into a seperate pool of tickets that anybody can access. Perhaps have an agent that sorts through tickets in the pool and assigns them to anybody who is available, preferably the person with fewest tickets in their queue/list. Once a customer emails and the system logs it they immediately get a response with a ticket number and maybe details of who is dealing with the problem. Any correspondance in relation to a particular ticket is automatically grouped into some sort of message, and not made into a load of separate tickets. I.e system scans incoming email subjects for ticket numbers and assosciates it with exisiting tickets if that number exists. Any help is much appreciated Thanks P.S I have taken a look at OTRS but i'm not feeling it so unless someone can convince me I guess i'm after an alternative.

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  • Rename a Network Printer win Win 7

    - by Alex
    Seems this is a common question but the answers regularly miss the point. I have a server. Server has some printers connected. Server has all drivers for x32 & x64 OS PLUS ALL DEFAULTS set. Server also manages print queue. I have many workstations, all need to use the printers. All NEED to have drivers print queue and DEFAULTS propagated from server. Now.... When I add the printers on the workstations, I get: "ABC Printer on SERVER123" I need something less long - just "ABC Printer" So how? Tip: Please don't show me how to change the name of your locally installed printer. I know how to do this - I am particularly interested in shared printers that look like "ABC Printer on SERVER123" Tip: Installing the driver with a local port wont cut it because then I loose the server propagated defaults, the driver updates and I need to run around with driver disks/confuse trembling users with hard things like choosing drivers. I am happy for a hack if there is no official way to do this in the group policy.... I tried looking in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Printers on the workstation machines but those are only local printers :( I can see the network printer details on the workstations here: HKEY_USERS[Some GUID]\Printers\Connections But there is nothing obvious like a description string... Can anyone help with this?

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  • RabbitMQ message consumers stop consuming messages

    - by Bruno Thomas
    Hi server fault, Our team is in a spike sprint to choose between ActiveMQ or RabbitMQ. We made 2 little producer/consumer spikes sending an object message with an array of 16 strings, a timestamp, and 2 integers. The spikes are ok on our devs machines (messages are well consumed). Then came the benchs. We first noticed that somtimes, on our machines, when we were sending a lot of messages the consumer was sometimes hanging. It was there, but the messsages were accumulating in the queue. When we went on the bench plateform : cluster of 2 rabbitmq machines 4 cores/3.2Ghz, 4Gb RAM, load balanced by a VIP one to 6 consumers running on the rabbitmq machines, saving the messages in a mysql DB (same type of machine for the DB) 12 producers running on 12 AS machines (tomcat), attacked with jmeter running on another machine. The load is about 600 to 700 http request per second, on the servlets that produces the same load of RabbitMQ messages. We noticed that sometimes, consumers hang (well, they are not blocked, but they dont consume messages anymore). We can see that because each consumer save around 100 msg/sec in database, so when one is stopping consumming, the overall messages saved per seconds in DB fall down with the same ratio (if let say 3 consumers stop, we fall around 600 msg/sec to 300 msg/sec). During that time, the producers are ok, and still produce at the jmeter rate (around 600 msg/sec). The messages are in the queues and taken by the consumers still "alive". We load all the servlets with the producers first, then launch all the consumers one by one, checking if the connexions are ok, then run jmeter. We are sending messages to one direct exchange. All consumers are listening to one persistent queue bounded to the exchange. That point is major for our choice. Have you seen this with rabbitmq, do you have an idea of what is going on ? Thank you for your answers.

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  • Abnormally high amount of Transmit discards reported by Solarwinds for multiple switches

    - by Jared
    I have several 3750X Cisco switches that, according to our Solarwinds NPM, are producing billions of transmit discards per day. I'm not sure why it's reporting these discards. Many of the ports on the 3750X's have 2960's connected to them and are hardcoded as trunk ports. Solarwinds NPM version 10.3 Cisco IOS version 12.2(58)SE2 Total output drops: 29139431: GigabitEthernet1/0/43 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is XXXX (bia XXXX) Description: XXXX MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:47, output 00:00:50, output hang never Last clearing of "show interface" counters 1w4d Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 29139431 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 35000 bits/sec, 56 packets/sec 51376 packets input, 9967594 bytes, 0 no buffer Received 51376 broadcasts (51376 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 51376 multicast, 0 pause input 0 input packets with dribble condition detected 115672302 packets output, 8673778028 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 pause output 0 output buffer failures, 0 output buffers swapped out sh controllers gigabitEthernet 1/0/43 utilization: Receive Bandwidth Percentage Utilization : 0 Transmit Bandwidth Percentage Utilization : 0

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  • What does this mean: "SATP VMW_SATP_LOCAL does not support device configuration"?

    - by Jason Tan
    Can anyone tell me what this means in ESXi 5.1?: SATP VMW_SATP_LOCAL does not support device configuration I've googled it and I get a lot of results, but as yet all the pages that contain the string are discussing other matters. The storage array is a HDS HUS-VM and the hosts are HP b460c G8 blades with flex fabric and flex fabric VCs which I am in the process of commissioning and would like to get it started on the right foot - i.e. error and warning free! naa.600508b1001c56ee3d70da65f071da23 Device Display Name: HP Serial Attached SCSI Disk (naa.600508b1001c56ee3d70da65f071da23) Storage Array Type: VMW_SATP_LOCAL Storage Array Type Device Config: SATP VMW_SATP_LOCAL does not support device configuration. Path Selection Policy: VMW_PSP_FIXED Path Selection Policy Device Config: {preferred=vmhba0:C0:T0:L1;current=vmhba0:C0:T0:L1} Path Selection Policy Device Custom Config: Working Paths: vmhba0:C0:T0:L1 Is Local SAS Device: true Is Boot USB Device: false This is the same LUN: ~ # esxcli storage core device list -d naa.60060e80132757005020275700000016 naa.60060e80132757005020275700000016 Display Name: HITACHI Fibre Channel Disk (naa.60060e80132757005020275700000016) Has Settable Display Name: true Size: 204800 Device Type: Direct-Access Multipath Plugin: NMP Devfs Path: /vmfs/devices/disks/naa.60060e80132757005020275700000016 Vendor: HITACHI Model: OPEN-V Revision: 5001 SCSI Level: 2 Is Pseudo: false Status: degraded Is RDM Capable: true Is Local: false Is Removable: false Is SSD: false Is Offline: false Is Perennially Reserved: false Queue Full Sample Size: 0 Queue Full Threshold: 0 Thin Provisioning Status: unknown Attached Filters: VAAI_FILTER VAAI Status: supported Other UIDs: vml.020001000060060e801327570050202757000000164f50454e2d56 Is Local SAS Device: false Is Boot USB Device: false ~ #

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  • Can any postfix guru assist me determine how emails are still being sent via my server from unauthorized sources?

    - by Dave
    Hi all, I'm getting a little concerned as I run a small server hosting a number of websites and manage the email for a few dozen people. Just recently though I've had a couple of notifications from spamcop alerting me that spam has been sent from my server, and when I have a look over the logs from time to time I can indeed see that there are many repeated attempts of mail being sent from my server. Most of the time it gets knocked back from the destination servers but sometimes its getting through. Unfortunately I'm not linux or postfix expert, I can get by but had though I had my machine locked down quite securely, I don't allow relaying, when I check the online DNS/MX tools they tend to report my server as being OK so I'm not sure where to take it now and hoping someone might be able to throw me a few pointers. I get lots of entries like this in my MAIL.INFO log Jan 2 08:39:34 Debian-50-lenny-64-LAMP postfix/qmgr[15993]: 66B88257C12F: from=<>, size=3116, nrcpt=1 (queue active) Jan 2 08:39:34 Debian-50-lenny-64-LAMP postfix/qmgr[15993]: 614C2257C1BC: from=<[email protected]>, size=2490, nrcpt=3 (queue active) and Jan 7 16:09:37 Debian-50-lenny-64-LAMP postfix/error[6471]: 0A316257C204: to=<[email protected]>, relay=none, delay=384387, delays=384384/3/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host mx.fakemx.net[46.4.35.23] refused to talk to me: 421 mx.fakemx.net Service Unavailable) Jan 7 16:09:37 Debian-50-lenny-64-LAMP postfix/error[6470]: 5848C257C20D: to=<[email protected]>, relay=none, delay=384373, delays=384370/3/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host mx.fakemx.net[46.4.35.23] refused to talk to me: 421 mx.fakemx.net Service Unavailable) then there tends to be connection timeouts, so from what I see even though I had relaying disabled.. something is getting by and trying to send.. So if you can help that will be greatly appreciated, and any further logging/config info I can supply. Thanks

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  • Account Preferences Crashes

    - by Vivek Sundaram
    When I click on System Preferences Accounts, I get a crash [every single time]. Here are a few interesting snippets from the "Problem Report". Any ideas on how to tackle this? Process: System Preferences [607] Path: /Applications/System Preferences.app/Contents/MacOS/System Preferences Identifier: com.apple.systempreferences Version: 7.0 (7.0) Build Info: SystemPrefsApp-1750100~5 Code Type: X86-64 (Native) Parent Process: launchd [184] OS Version: Mac OS X 10.6.5 (10H574) Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000117547860 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Application Specific Information: objc_msgSend() selector name: willSelect objc[607]: garbage collection is ON Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x00007fff80fd211c objc_msgSend + 40 1 com.apple.systempreferences 0x0000000100008426 0x100000000 + 33830 2 com.apple.systempreferences 0x0000000100006fb8 0x100000000 + 28600 3 com.apple.Foundation 0x00007fff84ede23c __NSFireDelayedPerform + 404 4 com.apple.CoreFoundation 0x00007fff824acbe8 __CFRunLoopRun + 6488 5 com.apple.CoreFoundation 0x00007fff824aadbf CFRunLoopRunSpecific + 575 6 com.apple.HIToolbox 0x00007fff82ec691a RunCurrentEventLoopInMode + 333 7 com.apple.HIToolbox 0x00007fff82ec671f ReceiveNextEventCommon + 310 8 com.apple.HIToolbox 0x00007fff82ec65d8 BlockUntilNextEventMatchingListInMode + 59 9 com.apple.AppKit 0x00007fff866c0e64 _DPSNextEvent + 718 10 com.apple.AppKit 0x00007fff866c07a9 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155 11 com.apple.AppKit 0x00007fff8668648b -[NSApplication run] + 395 12 com.apple.AppKit 0x00007fff8667f1a8 NSApplicationMain + 364 13 com.apple.systempreferences 0x0000000100001cf4 0x100000000 + 7412 ... Thread 0 crashed with X86 Thread State (64-bit): rax: 0x0000000000000001 rbx: 0x0000000200037840 rcx: 0x0000000200058031 rdx: 0x00007fff5fbfe2c0 ... Binary Images: 0x100000000 - 0x10001eff7 com.apple.systempreferences 7.0 (7.0) <30C04F1A-7711-1359-8A0E-D707B8BF2EB4> /Applications/System Preferences.app/Contents/MacOS/System Preferences 0x100758000 - 0x10076dfff com.apple.frameworks.opendirectoryconfigui 10.6.4 (10.6.4) <4711F2E8-DFA5-4C81-BB2A-B1E39D5B1B91> /System/Library/PrivateFrameworks/OpenDirectoryConfigUI.framework/Versions/A/OpenDirectoryConfigUI ...

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  • Postfix misconfigured? 550 Sender rejected from recieving server

    - by wnstnsmth
    We use Postfix on our CentOS 6 machine, having the following configuration. We use PHP's mail() function to send rudimentary password reset emails, but there is a problem. As you will see, mydomain and myhostname is correctly set, afaik. alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 html_directory = no inet_interfaces = localhost inet_protocols = all mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost mydomain = ***.ch myhostname = test.***.ch newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop unknown_local_recipient_reject_code = 550 Now this is the stuff that is in the /var/log/maillog of Postfix upon sending an email to ***.***@***.ch, with ***.ch being the same domain our sending server test.***.ch is on: Dec 13 16:55:06 R12X0210 postfix/pickup[6831]: E6D6311406AB: uid=48 from=<apache> Dec 13 16:55:06 R12X0210 postfix/cleanup[6839]: E6D6311406AB: message-id=<20121213155506.E6D6311406AB@test.***.ch> Dec 13 16:55:07 R12X0210 postfix/qmgr[6832]: E6D6311406AB: from=<apache@test.***.ch>, size=1276, nrcpt=1 (queue active) Dec 13 16:55:52 R12X0210 postfix/smtp[6841]: E6D6311406AB: to=<***.***@***.ch>, relay=mail.***.ch[**.**.249.3]:25, delay=46, delays=0.18/0/21/24, dsn=5.0.0, status=bounced (host mail.***.ch[**.**.249.3] said: 550 Sender Rejected (in reply to RCPT TO command)) Dec 13 16:55:52 R12X0210 postfix/cleanup[6839]: 8562C11406AC: message-id=<20121213155552.8562C11406AC@test.***.ch> Dec 13 16:55:52 R12X0210 postfix/bounce[6848]: E6D6311406AB: sender non-delivery notification: 8562C11406AC Dec 13 16:55:52 R12X0210 postfix/qmgr[6832]: 8562C11406AC: from=<>, size=3065, nrcpt=1 (queue active) Dec 13 16:55:52 R12X0210 postfix/qmgr[6832]: E6D6311406AB: removed Dec 13 16:55:52 R12X0210 postfix/local[6850]: 8562C11406AC: to=<root@test.***.ch>, orig_to=<apache@test.***.ch>, relay=local, delay=0.13, delays=0.07/0/0/0.05, dsn=2.0.0, status=sent (delivered to mailbox) Dec 13 16:55:52 R12X0210 postfix/qmgr[6832]: 8562C11406AC: removed So the receiving server rejects the sender (line 4 of log output). We have tested it with one other recipient and it worked, so this problem might be completely unrelated to our settings, but related to the recipient. Still, with this question, I want to make sure we're not making an obvious misconfiguration on our side.

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