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• Velocity CTP: can we 'search' for objects?

  - by Stato Machino

  It appears that 'tags' allow us to associate a 'search term' with the objects placed into the Velocity cache space. However, these can only be queried within a 'region'. Further, regions somehow limit the locality of objects in the cache to a single server (or maybe something kinda like that). So this appears to make it hard to perform any operation for which the unique Id of the cached item is not persisted or continuously available to the application that stores and retrieves objects to and from the cache. In any case, I can't see an easy way to 'cleanse' the cache of objects or to find objects across the entire cache that may share some prefix, postfix or infix values in the cache key so that i can clear out the cache of object repeatedly created in unit tests, for example. And I am unsure about the consequences of regions being associated with single server cache locations. So I would appreciate any help with the following questions: What is the difference between a 'distributed cache' (called a 'partitioned' cache??) when using regions, and a 'local cache'? 1.a. In particular, are the region-oriented values in a distributed cache visible through a cache factory that is configured to 'see' the entire cache space? Are the operations of creating and removing 'regions' efficient enough that it would be reasonable to create a region and a group of tags for each bundle of objects that need to be cached? 2.a. Or does this just push the problem of scoping the 'search for objects' up the chain because the ability of the DataCache object to query down through regions and tags as limited as querying for the cache keys of objects themselves. Thanks, Stato

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• ReplaceAll not working as expected

  - by Tim Kemp

  Still early days with Mathematica so please forgive what is probably a very obvious question. I am trying to generate some parametric plots. I have: ParametricPlot[{ (a + b) Cos[t] - h Cos[(a + b)/b t], (a + b) Sin[t] - h Sin[(a + b)/b t]}, {t, 0, 2 \[Pi]}, PlotRange -> All] /. {a -> 2, b -> 1, h -> 1} No joy: the replacement rules are not applied and a, b and h remain undefined. If I instead do: Hold@ParametricPlot[{ (a + b) Cos[t] - h Cos[(a + b)/b t], (a + b) Sin[t] - h Sin[(a + b)/b t]}, {t, 0, 2 \[Pi]}, PlotRange -> All] /. {a -> 2, b -> 1, h -> 1} it looks like the rules ARE working, as confirmed by the output: Hold[ParametricPlot[{(2 + 1) Cos[t] - 1 Cos[(2 + 1) t], (2 + 1) Sin[t] - 1 Sin[(2 + 1) t]}, {t, 0, 2 \[Pi]}, PlotRange -> All]] Which is what I'd expect. Take the Hold off, though, and the ParametricPlot doesn't work. There's nothing wrong with the equations or the ParametricPlot itself, though, because I tried setting values for a, b and h in a separate expression (a=2; b=1; h=1) and I get my pretty double cardoid out as expected. So, what am I doing wrong with ReplaceAll and why are the transformation rules not working? This is another fundamentally important aspect of MMA that my OOP-ruined brain isn't understanding. I tried reading up on ReplaceAll and ParametricPlot and the closest clue I found was that "ParametricPlot has attribute HoldAll and evaluates f only after assigning specific numerical values to variables" which didn't help much or I wouldn't be here. Thanks.

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• Shadowbox + jQuery not working - No errors.

  - by Shelton

  First, apologies. I'm a js newb. I'm attempting to trigger a shadowbox with the load of a specific page - a "pop-up" if you will. Nothing happens and according to firebug, there are no errors to report. I should note that this is wordpress, so I'm using the default jQuery call and also shadowbox rolled into a WP plug-in. Shadowbox does work properly in other areas of the site, as do jQuery functions. noConflict() is used because WP also loads prototype by default, which conflicts with the jQuery dollar sign. var $j = jQuery.noConflict(); $j(function(){ //Set cookie $j.cookie('padpop_viewed',true); // open a welcome message as soon as the window loads $j(function() { Shadowbox.open({ content: '<div width="600" height="460" style="margin:auto;"><a href="<?php bloginfo('url');?>"/products/"><img src="<?php bloginfo('template_url');?>/images/ipad-pop.jpg" width="600" height="460" alt="Redacted"/></a></div>', player: "html", height: "470", width: "610" }); }); }); Any help here would be greatly appreciated as I have spent hours consulting the documentation of each aspect of this. Thanks, S.

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• Why should I prefer OSGi Services over exported packages?

  - by Jens

  Hi, I am trying to get my head around OSGi Services. The main question I keep asking myself is: What's the benefit of using services instead of working with bundles and their exported packages? As far as I know it seems the concept of Late Binding has something to do with it. Bundle dependencies are wired together at bundle start, so they are pretty fixed I guess. But with services it seems to be almost the same. A bundle starts and registers services or binds to services. Of course services can come and go whenever they want and you have to keep track of these chances. But the core idea doesn't seem that different to me. Another aspect to this seems to be that services are more flexible. There could be many implementations for one specific Interface. On the other hand there can be a lot of different implementations for a specific exported package too. In another text I read that the disadvantage of using exported packages is that they make the application more fragile than services. The author wrote that if you remove one bundle from the dependency graph other dependencies would no longer be met, thus possibly causing a domino effect on the whole graph. But couldn't the same happen if a service would go offline? To me it looks like service dependencies are no better than bundle dependencies. So far I could not find a blog post, book or presentation that could clearly describe why services are better than just exposing functionality by exporting and importing packages. To sum my questions up: What are the key benefits of using OSGi Services that make them superior to exporting and importing packages?

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• Suitable web framework for the following scenario

  - by Paralife

  I have the following scenario: I have a view in an Oracle server and all Iwant is to show that view in a web browser, along with an input field or two for basic filtering. No users, no authentication, just this view maybe with a column or two linking to a second page for master detail viewing. The children are just string descriptions of the columns of the master that contain IDs. No inserts or updates. The question is which is the JAVA based web framework of choice that can accomplish the above in the minimum amount of code lines code time(subjective but also kind of objective if someone has expirience with more than one or two frameworks) configuration effort deployment effort and requirements. dependencies and mem footprint Also: 6. Oracle APEX is not an option. 3,4 and 5 are maybe the same in the sense that they are everything except the functionality coding. I want something that I can compile, deploy by just FTPing to the database host, run and forget. (e.g. For the deployment aspect, Hudson way comes in mind (java -jar hudson.war and that's all)). Also: 3,4 have priority over 1 and 2. (Explanation with a rant: I dont mind coding a lot as long as it is application code and not "why the fuck do we still use javascript over http for everything" code) Thanks.

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• Receiving "expected expression before" Error When Using A Struct

  - by Zach Dziura

  I'm in the process of creating a simple 2D game engine in C with a group of friends at school. I'd like to write this engine in an Object-Oriented way, using structs as classes, function pointers as methods, etc. To emulate standard OOP syntax, I created a create() function which allocates space in memory for the object. I'm in the process of testing it out, and I'm receiving an error. Here is my code for two files that I'm using to test: test.c: #include <stdio.h> int main() { typedef struct { int i; } Class; Class *test = (Class*) create(Class); test->i = 1; printf("The value of \"test\" is: %i\n", test->i); return 0; } utils.c: #include <stdio.h> #include <stdlib.h> #include "utils.h" void* create(const void* class) { void *obj = (void*) malloc(sizeof(class)); if (obj == 0) { printf("Error allocating memory.\n"); return (int*) -1; } else { return obj; } } void destroy(void* object) { free(object); } The utils.h file simply holds prototypes for the create() and destroy() functions. When I execute gcc test.c utils.c -o test, I'm receiving this error message: test.c: In function 'main': test.c:10:32: error: expected expression before 'Class' I know it has something to do with my typedef at the beginning, and how I'm probably not using proper syntax. But I have no idea what that proper syntax is. Can anyone help?

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• Defining implicit and explicit casts for C# interfaces

  - by ehdv

  Is there a way to write interface-based code (i.e. using interfaces rather than classes as the types accepted and passed around) in C# without giving up the use of things like implicit casts? Here's some sample code - there's been a lot removed, but these are the relevant portions. public class Game { public class VariantInfo { public string Language { get; set; } public string Variant { get; set; } } } And in ScrDictionary.cs, we have... public class ScrDictionary: IScrDictionary { public string Language { get; set; } public string Variant { get; set; } public static implicit operator Game.VariantInfo(ScrDictionary s) { return new Game.VariantInfo{Language=sd.Language, Variant=sd.Variant}; } } And the interface... public interface IScrDictionary { string Language { get; set; } string Variant { get; set; } } I want to be able to use IScrDictionary instead of ScrDictionary, but still be able to implicitly convert a ScrDictionary to a Game.VariantInfo. Also, while there may be an easy way to make this work by giving IScrDictionary a property of type Game.VariantInfo my question is more generally: Is there a way to define casts or operator overloading on interfaces? (If not, what is the proper C# way to maintain this functionality without giving up interface-oriented design?)

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• Trouble defining method for Javascript class definition.

  - by btoverdrive

  I'm somewhat new to object oriented programming in Javascript and I'm trying to build a handler object and library for a list of items I get back from an API call. Ideally, I'd like the library functions to be members of the handler class. I'm having trouble getting my class method to work however. I defined as part of the class bcObject the method getModifiedDateTime, but when I try to echo the result of the objects call to this method, I get this error: Error on line 44 position 26: Expected ';' this.getModifiedDateTime: function(epochtime) { which leads me to believe that I simply have a syntax issue with my method definition but I can't figure out where. response( { "items": [ {"id":711,"name":"Shuttle","lastModifiedDate":"1268426336727"}, {"id":754,"name":"Formula1","lastModifiedDate":"1270121717721"} ], "extraListItemsAttr1":"blah", "extraListItemsAttr2":"blah2" }); function response(MyObject) { bcObject = new bcObject(MyObject); thing = bcObject.getModifiedDateTime(bcObject.videoItem[0].lastModifiedDate); SOSE.Echo(thing); } function bcObject(listObject) { // define class members this.responseList = {}; this.videoCount = 0; this.videoItem = []; this.responseListError = ""; // instantiate members this.responseList = listObject; this.videoCount = listObject.items.length; // populate videoItem array for (i=0;i<this.videoCount;i++) { this.videoItem[i] = listObject.items[i]; } this.getModifiedDateTime: function(epochtime) { var dateStringOutput = ""; var myDate = new Date(epochtime); dateStringOutput = myDate.toLocaleString(); return dateStringOutput; }; }

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• Looking for PyQt4 embeddable terminal widget

  - by redShadow

  I wrote an application that, among other things, launches some "backend" processes to do some stuff. These subprocesses are very likely to fail or have unexpected behavior since they have to operate in quite hard conditions, so I prefer to give full control over them to the operator. NOTE: I am running these processes using a subprocess module based class instead of QProcess to have some more control functionality over the running process. At the moment, I'm using a QPlainTextEdit widget to which I append standard output/error from the subprocess, plus some buttons to quickly send some common signals (INT, STOP, CONT, KILL, ..), but: In some cases it would be useful to send some input too. Although it could be done with a text input box, I would prefer using something more "professional" Of course, there is no direct way to interpret special control characters, such as color codes, cursor movement, etc.. I had to implement an auto-scroll management of the console, but it is not guaranteed 100% to work nicely (sometimes the scroll locking doesn't work as expected, etc.) So: does anyone know something I could use to accomplish these needs? I found qtermwidget but it seems more oriented on handling a shell process (and the Python bindings seems to let you run /bin/bash only) by itself than communicating with an already existing process I/O.

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• Strategies for testing reactive, asynchronous code

  - by Arne

  I am developing a data-flow oriented domain-specific language. To simplify, let's just look at Operations. Operations have a number of named parameters and can be asked to compute their result using their current state. To decide when an Operation should produce a result, it gets a Decision that is sensitive to which parameter got a value from who. When this Decision decides that it is fulfilled, it emits a Signal using an Observer. An Accessor listens for this Signal and in turn calls the Result method of the Operation in order to multiplex it to the parameters of other Operations. So far, so good, nicely decoupled design, composable and reusable and, depending on the specific Observer used, as asynchronous as you want it to be. Now here's my problem: I would love to start coding actual Tests against this design. But with an asynchronous Observer... how should I know that the whole signal-and-parameters-plumbing worked? Do I need to use time outs while waiting for a Signal in order to say that it was emitted successfully or not? How can I be, formally, sure that the Signal will not be emitted if I just wait a little longer (halting problem? ;-)) And, how can I be sure that the Signal was emitted because it was me who set a parameter, and not another Operation? It might well be that my test comes to early and sees a Signal that was emitted way before my setting a parameter caused a Decision to emit it. Currently, I guess the trivial cases are easy to test, but as soon as I want to test complex many-to-many - situations between operations I must resort to hoping that the design Just Works (tm)...

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• PHP class extends not working why and is this how to correctly extend a class?

  - by Matthew

  Hi so I'm trying to understand how inherteince works in PHP using object oriented programming. The main class is Computer, the class that is inheriting is Mouse. I'm extedning the Computer class with the mouse class. I use __construct in each class, when I istinate the class I use the pc type first and if it has mouse after. For some reason computer returns null? why is this? class Computer { protected $type = 'null'; public function __construct($type) { $this->type = $type; } public function computertype() { $this->type = strtoupper($this->type); return $this->type; } } class Mouse extends Computer { protected $hasmouse = 'null'; public function __construct($hasmouse){ $this->hasmouse = $hasmouse; } public function computermouse() { if($this->hasmouse == 'Y') { return 'This Computer has a mouse'; } } } $pc = new Computer('PC', 'Y'); echo $pc->computertype; echo $pc->computermouse;

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• Simulate Golf Game Strategy

  - by Mitchel Sellers

  I am working on what at best could be considered a "primitive" golf game, where after a certain bit of randomness is introduced I need to play out a hole of golf. The hole is static and I am not concerned about the UI aspect as I just have to draw a line on a graphic of the hole after the ball has been hit showing where it traveled. I'm looking for input on thoughts of how to manage the "logic" side of the puzzle, below are some of my thoughts on the matter, input, suggestions, or references are greatly appreciated. Map out the hole into an array with a specific amount of precision, noting the type of surface: out of bounds, fairway, rough, green, sand, water, and most important the hole. Map out "regions" and if the ball is contained inside one of these regions setup parameters for "maximum" angle of departure. (For example the first part of the hole the shot must be between certain angles Using the current placement of the ball, and the region contained in #2, define a routine to randomly select the shooting angle, and power then move the ball, adjust the trajectory and move again. I know this isn't the "most elegant" solution, but in reality, we are looking for a quick and dirty solution, as I just have to do this a few times, set it and forget it afterward. From a languages perspective I'll be using ASP.NET and C# to get this done.

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• Python OOP - object has no attribute

  - by user1744269

  I am attempting to learn how to program. I really do want to learn how to program; I love the building and design aspect of it. However, in Java and Python, I have tried and failed with programs as they pertain to objects, classes, methods.. I am trying to develop some code for a program, but im stumped. I know this is a simple error. However I am lost! I am hoping someone can guide me to a working program, but also help me learn (criticism is not only expected, but APPRECIATED). class Converter: def cTOf(self, numFrom): numFrom = self.numFrom numTo = (self.numFrom * (9/5)) + 32 print (str(numTo) + ' degrees Farenheit') return numTo def fTOc(self, numFrom): numFrom = self.numFrom numTo = ((numFrom - 32) * (5/9)) return numTo convert = Converter() numFrom = (float(input('Enter a number to convert.. '))) unitFrom = input('What unit would you like to convert from.. ') unitTo = input('What unit would you like to convert to.. ') if unitFrom == ('celcius'): convert.cTOf(numFrom) print(numTo) input('Please hit enter..') if unitFrom == ('farenheit'): convert.fTOc(numFrom) print(numTo) input('Please hit enter..')

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• Main purpose of this task is to calculate volumes and surface areas of three dimensional geometric shapes like, cylinders, cones.

  - by Csc_Girl_Geek

  In Java Language Design your classes as below introducing: an Interface named “GeometricShapes” an abstract class named “ThreeDShapes” two child classes of ThreeDShapes: Cylinders and Cones. One test class names “TestShapes” Get the output for volumes and surface areas of cylinders and cones along with respective values of their appropriate input variables. Try to use toString() method and array. Your classes should be designed with methods that are required for Object-Oriented programming. So Far I Have: package Assignment2; public interface GeometricShapes { public void render(); public int[] getPosition(); public void setPosition(int x, int y); } package Assignment2; public abstract class ThreeDShapes implements GeometricShapes { public int[] position; public int[] size; public ThreeDShapes() { } public int[] getPosition() { return position; } public void setPosition(int x, int y) { position[0] = x; position[1] = y; } } package Assignment2; public class Cylinders extends ThreeDShapes { public Cylinder() { } public void render() { } } I don't think this is right and I do not know how to fix it. :( Please help.

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• Objective-measures of the expressiveness of programming languages [closed]

  - by Casebash

  I am very interested in the expressiveness of different languages. Everyone who has programmed in multiple languages knows that sometimes a language allows you to express concepts which you can't express in other languages. You can have all kinds of subjective discussion about this, but naturally it would be better to have an objective measure. There do actually exist objective measures. One is Turing-Completeness, which means that a language is capable of generating any output that could be generated by following a sequential set of steps. There are also other lesser levels of expressiveness such as Finite State Automata. Now, except for domain specific languages, pretty much all modern languages are Turing complete. It is therefore natural to ask the following question: Can we can define any other formal measures of expressiveness which are greater than Turing completeness? Now of course we can't define this by considering the output that a program can generate, as Turing machines can already produce the same output that any other program can. But there are definitely different levels in what concepts can be expressed - surely no-one would argue that assembly language is as powerful as a modern object oriented language like Python. You could use your assembly to write a Python interpreter, so clearly any accurate objective measure would have to exclude this possibility. This also causes a problem with trying to define the expressiveness using the minimum number of symbols. How exactly to do so is not clear and indeed appears extremely difficult, but we can't assume that just because we don't know how to solve a problem, that nobody know how to. It is also doesn't really make sense to demand a definition of expressiveness before answering the question - after all the whole point of this question is to obtain such a definition. I think that my explanation will be clear enough for anyone with a strong theoretical background in computer science to understand what I am looking for. If you do have such a background and you disagree, please comment why, but if you don't thats probably why you don't understand the question.

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• Should I Teach My Son Programming? What approaches should I take? [closed]

  - by DaveDev

  I was wondering if it's a good idea to teach object oriented programming to my son? I was never really good at math as a kid, but I think since I've started programming it's given me a greater ability to understand math by being better able to visualise relationships between abstract models. I thought it might give him a better advantage in learning & applying logical & mathematical concepts throughout his life if he was able to take advantage of the tools available to programmers. what would be the best programming fields, techniques and/or concepts? What approach should I take? what concepts should I avoid? what fields of mathematics would he find this benfits him most? He's only 2 now so it wouldn't be for another few years before I do this, (and even at that, only from a very high level point of view). I thought I'd put it to the programming community and see what you guys thought? Possible Duplicate: What are some recommended programming resources for pre-teens?

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• Eclipc java,writting a program [closed]

  - by ghassar

  I have an important exercise for that i found in the internet please i need help in using eclipc java thanks i have to design, implement, test and document a Java program (a set of classes) for one of the following problem specifications: Problem 1 – Jubilee Estate Agency Property Management System A local Estate Agent would like a prototype system to keep track of properties that are offered for sale. The Estate Agent sells domestic and commercial properties. You will need to define classes that represent the Estate Agency System. You should design your system and the classes that you will need before starting coding. Your system must have a graphical user interface and be designed and developed using the object-oriented principles of the MVC architecture design pattern i.e. the user interface class must be separate from the other classes. The initial basic requirements for the system are as follows: • Include a list of domestic properties for sale that include details of: address, description, selling price, and number of rooms • Include a list of commercial properties for sale that include details of: address, description, selling price, and area in square metres • Enable the properties that are for sale to be viewed on the screen • Allow the customer to select one or more properties to be placed on a ‘viewing list’ so that the properties can be visited in person • Display on the screen the viewing list that shows the details of the properties chosen • Provide a basic search facility to find properties that are for sale in a particular price band and display the results • Enable a property to be marked as sold

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• How can I communicate with an Object created in another JFrame?

  - by user3093422

  so my program basically consists of two frames. As I click a button on Frame1, Frame2 pops up, and when I click a button on Frame2, and Object is created and the window closes. Now, I need to be able to use the methods of Object in my Frame1, how can this be achieved? I am kind of new to Object-Oriented Programming, sorry, but it's hard to me to explain the situation. Thanks! I will try to put a random code for pure example below. JFrame 1: public class JFrame1 extends JFrame{ variables.. public JFrame1(){ GUIcomponents.... } public static void main(String[] args) { JFrame1 aplicacion = new JFrame1(); aplicacion.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } private class ActList implements ActionListener { public void actionPerformed(ActionEvent event) { new JFrame2(); } } } JFrame 2: public class JFrame2 extends JFrame{ variables.. public JFrame2(){ GUIcomponents.... } private class ActList implements ActionListener { public void actionPerformed(ActionEvent event) { Object object = new Object(); setVisible(false); } } } Sorry if it's messy, I made it in the moment. So yeah, basically I want to JFrame1 to be able to use the getters and settes from Object, which was created in JFrame2. What should I do? Once again, thanks!

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• New Computer Build Questions

  - by MJ

  I'm in the process of gathering parts and specs for a new machine. I wear many hats, so the machine needs to do a lot. I need at least 2 monitor support, if not three. I also play many online MMOs (wow, aion, war hammer, etc), along with some freelance programming projects. I already have a case which is very large, so it will fit anything. I have 2 other SATA HDs. They are more for storage and basic programs. I feel that the best improvement could be done with a solid state HD, true or not? I'm more of a software/programming guy, so ANY input at all on improving this system build would be appreciated. I have a few questions with this list. AMD or Intel? I don't know enough about either to choose what would best fit me. Thanks! **EDIT: Thanks for the input everyone! Here are some answers: I do a lot of programming and gaming, so I do need things for both. The newer video card covers the gaming aspect, as well as allowing me to have many monitors. (hopefully upgrade to dual 30' or more) I don't need any additional HDs at this time. I have a SATA 160g and 120g from my previous computer, and a NAS system with over 2TB of storage on the homenetwork. I just wanted a fast HD for OS/programs/games. With the memory. I have used G.SKILL before in 2 system builds. It's done excellent for me in them. Very stable. **EDIT2: Made some additional changes. Lowered the power supply down to 750, which saves me more $$. Also changed the SSD to 2 WD 650G HDs. Thinking of doing a CPU upgrade to the 3.4GHZ AMD Phenom II X4 965 Black Edition Deneb 3.4GHz System Specs - Budget:$1500 CPU: AMD Phenom II X4 955 Black Edition Deneb 3.2GHz MB: GIGABYTE GA-MA790GPT-UD3H AM3 AMD 790GX HDMI ATX Memory: G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 1066 Video: DIAMOND 5870PE51G Radeon HD 5870 (Cypress XT) 1GB 256-bit GD Power Supply: XCLIO GREATPOWER 1000W ATX12V SLI Ready CrossFire Ready HD:Intel X25-M Mainstream SSDSA2MH080G2C1 2.5" 80GB SATA II MLC Changes: Power Supply: CORSAIR CMPSU-750TX 750W ATX12V / EPS12V HD: 2x Western Digital Caviar Blue WD6400AAKS 640GB CPU: AMD Phenom II X4 965 Black Edition Deneb 3.4GHz

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• Squid 2.7.STABLE3-4.1 as a transparent proxy on Ubuntu Server 9.04

  - by E3 Group

  Can't get this to work at all! I'm trying to get this linux box to act as a transparent proxy and, with the help of DHCP, force everyone on the network to gate into the proxy. I have two ethernet connections, both to the same switch. And I'm trying to get 192.168.1.234 to become the default gateway. The actual WAN connection is to a gateway 192.168.1.1. eth0 is 192.168.1.234 eth1 is 192.168.1.2 Effectively I'm trying to make eth0 a LAN only interface and eth1 a WAN interface. I've oi should set the gateway for eth1 to point to 192.168.1.234 my squid.conf file has the following directives added at the bottom: nly set eth0 to have a gateway address in /etc/network/interfaces I'm not sure whether http_port 3128 transparent acl lan src 192.168.1.0/24 acl lh src 127.0.0.1/255.255.255.0 http_access allow lan http_access allow lh i've added the following routing commands: iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.1.2:3128 iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 I set a computer with TCP settings 192.168.1.234 as the gateway and opened up google.com, but it comes up with a request error. Any ideas why this isn't working? :( Been searching continuously for a solution to no avail. ----------------------------- EDIT ------------------------------- Managed to get it to route properly to the squid, here's the error I get in the browser: ERROR The requested URL could not be retrieved While trying to process the request: GET / HTTP/1.1 Host: www.google.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-gb,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Cache-Control: max-age=0 The following error was encountered: * Invalid Request Some aspect of the HTTP Request is invalid. Possible problems: * Missing or unknown request method * Missing URL * Missing HTTP Identifier (HTTP/1.0) * Request is too large * Content-Length missing for POST or PUT requests * Illegal character in hostname; underscores are not allowed Your cache administrator is webmaster. Generated Mon, 26 Oct 2009 03:41:15 GMT by mjolnir.lloydharrington.local (squid/2.7.STABLE3)

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• Apache2 cgi's crash on odbc db access (but run fine from shell)

  - by Martin

  Problem overview (details below): I'm having an apache2 + ruby integration problem when trying to connect to an ODBC data source. The main problem boils down to the fact that scripts that run fine from an interactive shell crash ruby on the database connect line when run as a cgi from apache2. Ruby cgi's that don't try to access the ODBC datasource work fine. And (again) ruby scripts that connect to a database with ODBC do fine when executed from the command line (or cron). This behavior is identical when I use perl instead of ruby. So, the issue seems to be with the environment provided for ruby (perl) by apache2, but I can't figure out what is wrong or what to do about it. Does anyone have any suggestions on how to get these cgi scripts to work properly? I've tried many different things to get this to work, and I'm happy to provide more detail of any aspect if that will help. Details: Mac OS X Server 10.5.8 Xserve 2 x 2.66 Dual-Core Intel Xeon (12 GB) Apache 2.2.13 ruby 1.8.6 (2008-08-11 patchlevel 287) [universal-darwin9.0] ruby-odbc 0.9997 dbd-odbc (0.2.5) dbi (0.4.3) mod_ruby 1.3.0 Perl -- 5.8.8 DBI -- 1.609 DBD::ODBC -- 1.23 odbc driver: DataDirect SequeLink v5.5 (/Library/ODBC/SequeLink.bundle/Contents/MacOS/ivslk20.dylib) odbc datasource: FileMaker Server 10 (v10.0.2.206) ) a minimal version of a script (anonymized) that will crash in apache but run successfully from a shell: #!/usr/bin/ruby require 'cgi' require 'odbc' cgi = CGI.new("html3") aConnection = ODBC::connect('DBFile', "username", 'password') aQuery = aConnection.prepare("SELECT zzz_kP_ID FROM DBTable WHERE zzz_kP_ID = 81044") aQuery.execute aRecord = aQuery.fetch_hash.inspect aQuery.drop aConnection.disconnect # aRecord = '{"zzz_kP_ID"=>81044.0}' cgi.out{ cgi.html{ cgi.body{ "<pre>Primary Key: #{aRecord}</pre>" } } } Example of running this from a shell: gamma% ./minimal.rb (offline mode: enter name=value pairs on standard input) Content-Type: text/html Content-Length: 134 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML><BODY><pre>Primary Key: {"zzz_kP_ID"=>81044.0}</pre></font></BODY></HTML>% gamma% ) typical crash log lines: Dec 22 14:02:38 gamma ReportCrash[79237]: Formulating crash report for process perl[79236] Dec 22 14:02:38 gamma ReportCrash[79237]: Saved crashreport to /Library/Logs/CrashReporter/perl_2009-12-22-140237_HTCF.crash using uid: 0 gid: 0, euid: 0 egid: 0 Dec 22 14:03:13 gamma ReportCrash[79256]: Formulating crash report for process perl[79253] Dec 22 14:03:13 gamma ReportCrash[79256]: Saved crashreport to /Library/Logs/CrashReporter/perl_2009-12-22-140311_HTCF.crash using uid: 0 gid: 0, euid: 0 egid: 0

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• iPhone 3G refuses to transfer purchased apps to iTunes

  - by andynormancx

  My iPhone 3G refuses to transfer purchased apps to iTunes. This is causing me major problems with syncing. Whenever I attempt to transfer apps from the iPhone to iTunes it goes through the motions, but never actually transfers anything. It displays the various apps in the info area at the top of the screen, but the progress bar never advances. In comparison when I sync other iPhones, using the same install of iTunes, the progress bar advances and apps are transferred. The same also happens on clean installs of iTunes on other computers, it seems to be my iPhone that is the common factor. I have tried restoring the phone from a backup, which makes no difference. This started happening months ago and the phone has since been upgraded to 3.0 and 3.1, but the problem still persists. Originally it was just a minor irritation, but I made and attempt to fix it which has made things worse. I deleted all the apps from with iTunes and then did "Transfer purchases" in the hope that it might fix something. It didn't fix anything. Also, I cannot now sync at all. If I do sync iTunes now does "transferring purchases", fails to transfer and then deletes all the apps (and data) from my iPhone. It also means I can't sync music, podcasts or anything else. I can't sync anything else, because I can't temporarily turn off app syncing because then iTunes warns that the apps on the iPhone will be deleted. I also tried de-authorising and re-authorising. What can I do to get app syncing working again ? P.S. I have considered deleting all the apps and reinstalling them one by one, in the hope that it will fix the problem. However I don't really want to embark on doing that for 55+ apps and re-entering login details etc for the apps that need them, especially as I might then find out it didn't solve the problem. Update: The latest update to iTunes 9 has improved things in one key aspect. If I let a sync run to completion iTunes no longer deletes all the apps from my phone. So I can now sync all my other data, even if I still can't sync my apps. Resolved: See my answer to the question for how I finally resolved the problem.

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• Squid 2.7.STABLE3-4.1 as a transparent proxy on Ubuntu Server 9.04

  - by LOGIC9

  Can't get this to work at all! I'm trying to get this linux box to act as a transparent proxy and, with the help of DHCP, force everyone on the network to gate into the proxy. I have two ethernet connections, both to the same switch. And I'm trying to get 192.168.1.234 to become the default gateway. The actual WAN connection is to a gateway 192.168.1.1. eth0 is 192.168.1.234 eth1 is 192.168.1.2 Effectively I'm trying to make eth0 a LAN only interface and eth1 a WAN interface. I've oi should set the gateway for eth1 to point to 192.168.1.234 my squid.conf file has the following directives added at the bottom: nly set eth0 to have a gateway address in /etc/network/interfaces I'm not sure whether http_port 3128 transparent acl lan src 192.168.1.0/24 acl lh src 127.0.0.1/255.255.255.0 http_access allow lan http_access allow lh i've added the following routing commands: iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.1.2:3128 iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 I set a computer with TCP settings 192.168.1.234 as the gateway and opened up google.com, but it comes up with a request error. Any ideas why this isn't working? :( Been searching continuously for a solution to no avail. ----------------------------- EDIT ------------------------------- Managed to get it to route properly to the squid, here's the error I get in the browser: ERROR The requested URL could not be retrieved While trying to process the request: GET / HTTP/1.1 Host: www.google.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-gb,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Cache-Control: max-age=0 The following error was encountered: * Invalid Request Some aspect of the HTTP Request is invalid. Possible problems: * Missing or unknown request method * Missing URL * Missing HTTP Identifier (HTTP/1.0) * Request is too large * Content-Length missing for POST or PUT requests * Illegal character in hostname; underscores are not allowed Your cache administrator is webmaster. Generated Mon, 26 Oct 2009 03:41:15 GMT by mjolnir.lloydharrington.local (squid/2.7.STABLE3)

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• Ubuntu Server 10.04 Heavy Network Traffic causes disconnect

  - by K Vaughan

  I'm currently running a headless Ubuntu 10.04 server. Installed is the LAMP stack, Joomla, Virtualbox, phpvirtualbox, webmin and proFTP.. It resolves the IP address so I can access it remotely (either the apache2 webserver or the FTP) using DDClient. Any packages installed have been installed using apt-get. Webmin, although discouraged in Ubuntu Server, is used mostly to administer the webserver aspect. This issue also appeared when I was using Ubuntu Server 10.10. After periods of heavy network traffic, whether local or remote, the connect drops. I'm talking specifically about the transfer of files via FTP, SCP or Samba (the latter of which I seldom use). There is no response to ping or ssh. I can't FTP to the server nor can I load the website. There are times when the server has been on for a few days and everything runs fine because I haven't accessed it much, if at all (thus not much network traffic). I've gone through a few hardware changes although I don't believe this has cause the issue: this has been happening long before I made any changes. At first I thought it was my ISP-provided router blocking traffic because of some kind of misconfiguration (perhaps assuming it was some kind of DoS attack). I've changed routers and still found no success. I've checked syslog, dmesg and kern.log for warnings but have uncovered none. I've ran memtest via the GRUB2 menu at boot and once it turned up 4 errors. I ran again with individual sticks of RAM in various slots and everything turned up fine. I've looked through the BIOS settings and everything looks fine. I've tried unplugging unnecessary pieces of hardware (other internal hard drives, CD drives, floppy, PCI cards, etc). Any help or tips on how I can even begin to troubleshoot this would be very much appreciated. Please note that i've only started playing with servers as a hobby so my knowledge wouldn't be the most refined. I'm comfortable with command line and have the initiative to know how to look up something I can't do. Unfortunately I can't seem to find any issues like this. Additionally: If a solution can't be found some assistance to write a script that will cause the server to reboot automatically if, after x minutes, it gets no response to pinging somewhere like google. Admittedly that's not the cleanest solution should my internet end up going down but I can't think of what else to do.

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• What are the pros and cons of AWS Elastic Beanstalk compared with other deployment strategies?

  - by James van Dyke

  I'm pretty new to the whole Netflix OSS stack and deployments in general. As a background for my current level of knowledge ops-wise, my main role is as a front-end application engineer. However, I enjoy the operations side of things, so I'm attempting to setup a new deployment strategy and the tooling for a new project. Our Goals Super easy deploys (we want to push a button to update production) Automated deploys to test environments (using Jenkins) Ease of maintenance (we have an app to write, don't want to spend our time fiddling with production issues) Ability to handle a service oriented architecture (many small apps, various languages and data stores) Enough flexibility to ensure we won't have to change strategies any time soon (we're already trying to get away from RightScale) We're OK with a little more initial setup time if doing so will save us some headaches in the future. So, along these lines, I've been listening to podcasts, watching Ops talks, and reading tons of blog posts and based on our goals and what I've taken to be some forming best practices, we've started forming a plan using Asgard, rolling our package into a jar and rolling that into an AMI. We had this all planned out and like the advantages the process versus using a Chef server and converging instances on the fly (we felt this was error prone given our limited timeline and lack of understanding around a Chef server workflow). However, a coworker did a little looking around on his own and felt like Elastic Beanstalk met our needs. I've looked into it and spun up a test environment with a WAR file and an attached RDS database. Things seem to work and I believe that we can automate deploys to a testing environment using Jenkins via the AWS API. Seems simple enough... perhaps too simple. What I'm wondering is, what's the catch? If Elastic Beanstalk is so simple and effective, why isn't it talked about more? I'm having a hard time finding enough objective opinions and facts about the two different deployment strategies, so I thought I'd ask around. Do you use Elastic Beanstalk? If so, why and what factors lead to that decision? What do you like and dislike? If you don't use Elastic Beanstalk but considered it, what do you use and why didn't you use Elastic Beanstalk? What are the advantages and disadvantages to a Elastic Beanstalk based deployment strategy for an SOA? That is, will Elastic Beanstalk work well with many small applications that rely on each other to work?

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