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  • How to get Acknowlegement in TCP communication in Java

    - by Sunil Kumar Sahoo
    I have written a socket program in Java. Both server and client can sent/receive data to each other. But I found that if client sends data to server using TCP then internally TCP sends acknowledgement to the client once the data is received by the server. I want to detect or handle that acknowledgement. How can I read or write data in TCP so that I can handle TCP acknowledgement. Thanks Sunil Kumar Sahoo

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  • maintain pageViews in global.asax (asp.net)

    - by nishant
    I need a function in global.asax file which gets called only once when user enter a page url. application_beginrequest gets called 50-60 times in a single page( as to render a page several requests go to server.) i though of a solution - I can write my fucntion in global.asax and call it on page load of other pages but in that solution I need to call it in every page. I would prefer something which is to be done only in global.asax

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  • Android JARSIGNER GUI tool?

    - by BahaiResearch.com
    Newbie question. After I have written the Android App (easy part) I need to sign it and upload it (seems the hard part) Is there an Open Source app or tool that I can use to do this so that I don't have to write command shell scripts. JARSIGNER looks overly complex. I'm looking for a dead simple Sign-And-Package up tool. I am using Eclipse with the Android plug in.

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  • Hbase / Hadoop Query Help

    - by zechariahs
    I'm working on a project with a friend that will utilize Hbase to store it's data. Are there any good query examples? I seem to be writing a ton of Java code to iterate through lists of RowResult's when, in SQL land, I could write a simple query. Am I missing something? Or is Hbase missing something?

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  • mysql index optimization for a table with multiple indexes that index some of the same columns

    - by Sean
    I have a table that stores some basic data about visitor sessions on third party web sites. This is its structure: id, site_id, unixtime, unixtime_last, ip_address, uid There are four indexes: id, site_id/unixtime, site_id/ip_address, and site_id/uid There are many different types of ways that we query this table, and all of them are specific to the site_id. The index with unixtime is used to display the list of visitors for a given date or time range. The other two are used to find all visits from an IP address or a "uid" (a unique cookie value created for each visitor), as well as determining if this is a new visitor or a returning visitor. Obviously storing site_id inside 3 indexes is inefficient for both write speed and storage, but I see no way around it, since I need to be able to quickly query this data for a given specific site_id. Any ideas on making this more efficient? I don't really understand B-trees besides some very basic stuff, but it's more efficient to have the left-most column of an index be the one with the least variance - correct? Because I considered having the site_id being the second column of the index for both ip_address and uid but I think that would make the index less efficient since the IP and UID are going to vary more than the site ID will, because we only have about 8000 unique sites per database server, but millions of unique visitors across all ~8000 sites on a daily basis. I've also considered removing site_id from the IP and UID indexes completely, since the chances of the same visitor going to multiple sites that share the same database server are quite small, but in cases where this does happen, I fear it could be quite slow to determine if this is a new visitor to this site_id or not. The query would be something like: select id from sessions where uid = 'value' and site_id = 123 limit 1 ... so if this visitor had visited this site before, it would only need to find one row with this site_id before it stopped. This wouldn't be super fast necessarily, but acceptably fast. But say we have a site that gets 500,000 visitors a day, and a particular visitor loves this site and goes there 10 times a day. Now they happen to hit another site on the same database server for the first time. The above query could take quite a long time to search through all of the potentially thousands of rows for this UID, scattered all over the disk, since it wouldn't be finding one for this site ID. Any insight on making this as efficient as possible would be appreciated :) Update - this is a MyISAM table with MySQL 5.0. My concerns are both with performance as well as storage space. This table is both read and write heavy. If I had to choose between performance and storage, my biggest concern is performance - but both are important. We use memcached heavily in all areas of our service, but that's not an excuse to not care about the database design. I want the database to be as efficient as possible.

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  • Rotate webpage via code?

    - by Adam Davis
    I'm hoping that there's a relatively simple way to rotate a webpage a little bit, 30 degrees or so, while still leaving it fully functional and usable. I completely control the page, and can modify it to make this easier if needed. I'd rather not re-write the whole thing in SVG, though, but perhaps javascript and canvas will work? Is there a way using CSS, Javascript, or some other cross browser method that would allow me to accomplish this?

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  • Why does /MANIFESTUAC:NO work?

    - by Eamon
    Windows 7, C++, VS2008 I have a COM DLL that needs to be registered using "runas administrator" (it is a legacy app that writes to the registry) The DLL is used by a reports app which instantiates it using CoCreateInstance. This failed unless I also ran the reports app as administrator; until I changed the linker setting from /MANIFESTUAC to /MANIFESTUAC:NO Can anyone tell me why this works? Does it mean that I can write apps that bypass the UAC using this setting?

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  • Get text from listview onclick (Android)

    - by dweebsonduty
    I am creating lists in my android app and would like to capture the text of the list item that is clicked but I want to do it in a seperate function so I only have to write the code once. And I want to be able to compare the string to another sting. What is the best way to do this?

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  • creating an executable file without a compiler

    - by Alterlife
    I came across an article a long while ago on how to write out a .com file directly without using any external tools. the method was to basically copy con myfile.com and then hit ctrl+alt+number for each instruction. I've lost the url for the guide... Google isn't helping much either. If you have the link, please could you post it.

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  • What is the best way to documentate a system metaphor?

    - by SDReyes
    A metaphor help us to communicate with our project stakeholders, using a shared set of concepts and analogies. we develop them all the time, in one way or another. even the XP- programming highly recommend to get it defined since project start. How do you write such thing down in a document (specially if it already exists)? maybe a dictionary-like approach?

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  • Python networkx DFS or BFS missing?

    - by sadawd
    Dear Everyone I am interested in finding a path (not necessarily shortest) in a short amount of time. Dijsktra and AStar in networkx is taking too long. Why is there no DFS or BFS in networkx? I plan to write my own DFS and BFS search (I am leaning more towards BFS because my graph is pretty deep). Is there anything that I can use in networkx's lib to speed me up? Thx

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  • Get client ip with python

    - by Elad
    Hi, I'm a newbie in python. I want to write a simple web that prints the client ip on screen my http.conf Handler: AddHandler mod_python .py PythonHandler mod_python.publisher PythonDebug On The cgi.escape(os.environ["REMOTE_ADDR"]) return this error: KeyError: 'REMOTE_ADDR' and I just get lost with the BaseHTTPRequestHandler so what is the simple way to get the client ip? thank you.

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  • Simplest Way to Test ODBC on WIndows

    - by Rescommunes
    With unixODBC you can use a simple command line utility called "isql" to test your connection permissions etc. Without having to write extra code or install libs is there a simple way to open up X data source send some sql commands and be done with it?

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  • Convert alphabet letters to number in python

    - by altin
    Can someone help me finish this characters = ['a''b''c''d''e''f''g''h''i''j''k''l''m''n''o''p''q''r''t''u''v''w''x''y''z'] numbers = ['1''2''3''4''5''6''7''8''9''10''11''12''13''14''15''16''17''18''19''20''21''22''23''24'] text = raw_input(' Write text: ') Ive tryed to many ways but couldnt get to the pint, I want to make exc if i type hello the output to be in numbers lined like in alphabet... example a = 1 < in alphabet Can anyone give ideas ? or help sth ?

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  • Handling Unknown JSON Properties with Jackson

    - by henrik_lundgren
    Hi, For deserializing json with unknown field into an object there's @JsonAnySetter. But what if I read such json into my object, modify some known fields and write it back to json? The unknown properties will be lost. How do I handle such cases? Is it possible to map an object or do I have to read the data into a JsonNode or Map?

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  • Exclude a string from wildcard search in a shell

    - by steigers
    Hello everybody I am trying to exclude a certain string from a file search. Suppose I have a list of files: file_Michael.txt, file_Thomas.txt, file_Anne.txt. I want to be able and write something like ls *<and not Thomas>.txt to give me file_Michael.txt and file_Anne.txt, but not file_Thomas.txt. The reverse is easy: ls *Thomas.txt Doing it with a single character is also easy: ls *[^s].txt But how to do it with a string? Sebastian

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