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• Efficiency of while(true) ServerSocket Listen

  - by Submerged

  I am wondering if a typical while(true) ServerSocket listen loop takes an entire core to wait and accept a client connection (Even when implementing runnable and using Thread .start()) I am implementing a type of distributed computing cluster and each computer needs every core it has for computation. A Master node needs to communicate with these computers (invoking static methods that modify the algorithm's functioning). The reason I need to use sockets is due to the cross platform / cross language capabilities. In some cases, PHP will be invoking these java static methods. I used a java profiler (YourKit) and I can see my running ServerSocket listen thread and it never sleeps and it's always running. Is there a better approach to do what I want? Or, will the performance hit be negligible? Please, feel free to offer any suggestion if you can think of a better way (I've tried RMI, but it isn't supported cross-language. Thanks everyone

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• Distributing WPF apps to a legacy user base: How seamless is it?

  - by Christian Nunciato

  I'm considering developing a WPF application, to be hosted by a legacy Windows app (C++), and I'm trying to get a better sense of how feasible it'll be to do so, given the broad user base I'm targeting. Knowing WPF targets .NET 3.5, I'm looking for some insight as to what the field looks like right now -- who's already got the runtime, whether it's distributed by Windows Update, if so, how (e.g., as an optional or required download, to which operating systems, etc.), whether XP pre-XP2 supports it (and how), and so on. The current version's got many thousands of users, using all manner of Windows operating systems, and while I'd very much like to leverage WPF to breathe some life into their user experience, I want to make sure I'm not shutting anyone out by doing so, or burdening them with a download they might have to do manually. I realize most, or all, of this information's out there already, in various places, but I figured I'd ask here first, since I'm sure some of you've probably already gone down this road and have valuable experiences to share. Thanks in advance!

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• Can I use/include gsdll32.dll redmonnt.dll (no modificaitons) in a commercial application for my cli

  - by scriptmaster

  Hi - I am not a license expert, however after a lot of research, I am still struggling to answer the following questions and would like to know if my assumptions are right! 1) Is it legal to include gsdll32.dll and redmonnt.dll in a commercial product? A: ? 2) Should I release any source code of the commercial app where I am using this library? A: ? 3) Is there a commercial license (a small fee that my client can pay to use these libraries) to GhostScript? A: ? 4) Whats the meaning of "although it may be distributed ("aggregated") with commercial products." in this para: http://pages.cs.wisc.edu/~ghost/doc/AFPL/8.00/New-user.htm#Commercial_use A: ? 5) What are the alternate solutions? A: ?

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• Anyone up to creating a tomcat based alternative for GAE?

  - by bach

  Hi, If we had the possibility to run GAE app without any code change on our servlet engine that would be great because: in case that google changes their billing policy we can just jump to our own server or in case their current policy doesn't fit our app needs we can do stuff which is not allowed in the GAE, compromising a 1 JVM, 1 DB We don't actually need a distributed system but more of a realtime system with synchronize, true locking mechanisms, other servers/software installed on the server machine, socket interface etc... Such a package should include at least: TomCat (or equivalent) DataNucleus Access Platform (Task Queue service) Any idea if it's easy to get such a thing or if it's already exist somewhere? Thanks

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• DLL dependant on curllib.dll - How can I fix this?

  - by haraldo

  Hi there, I'm new to developing in C++. I've developed a dll where I'm using curllib to make HTTP requests. When running the dll via depend.exe it notifies me that my dll now depends on the curllib.dll. This simply doesn't work for me. My dll is set as a static library not shared and will be distributed on its own. I cannot rely on a user having libcurl.dll installed. I thought by including libcurl into my project this is all that would be needed and my dll could be independent. If this is impossible to resolve is there an alternative method I can use to create HTTP requests? Obviously I would prefer to use libcurl. Thanks in advance.

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• how random is Math.random() in java across different jvms or different machines

  - by user881480

  I have a large distributed program across many different physical servers, each program spawns many threads, each thread use Math.random() in its operations to draw a piece from many common resource pools. The goal is to utilize the pools evenly across all operations. Sometimes, it doesn't appear so random by looking at a snapshot on a resource pool to see which pieces it's getting at that instant (it might actually be, but it's hard to measure and find out for sure). Is there something that's better than Math.random() and performs just as good (not much worse at least)?

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• Agile development; on-line free tools!

  - by BT.

  We have been looking to implement Agile methodology within our geographically distributed development team, so i need suggestions on any free on-line application that you have used and find useful. Right now we are using paper cards and wall to manage this :), but we want to shift to an on-line version preferably free. I have used TargetProcess at my previous job! My Core requirements are: Business Analyst can add user stories We can assign, prioritize different user stories to developers. QA team can add test cases around different user stories. Project Manager can track the time of all the resources and can pull reports for upper management

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• Can EC2 instances be set up to come from different IP ranges?

  - by Joshua Frank

  I need to run a web crawler and I want to do it from EC2 because I want the HTTP requests to come from different IP ranges so I don't get blocked. So I thought distributing this on EC2 instances might help, but I can't find any information about what the outbound IP range will be. I don't want to go to the trouble of figuring out the extra complexity of EC2 and distributed data, only to find that all the instances use the same address block and I get blocked by the server anyway. NOTE: This isn't for a DoS attack or anything. I'm trying to harvest data for a legitimate business purpose, I'm respecting robots.txt, and I'm only making one request per second, but the host is still shutting me down. Edit: Commenter Paul Dixon suggests that the act of blocking even my modest crawl indicates that the host doesn't want me to crawl them and therefore that I shouldn't do it (even assuming I can work around the blocking). Do people agree with this?

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• What is a good Java web crawler library?

  - by DrDee

  Hi, I am about to develop a crawler in Java but don't feel like reinventing the wheel. A quick Google search gives a whole bunch of Java libraries to build a web crawler. Besides that Nutch is of course a very robust package but seems a bit too advanced for my needs. I only need to crawl a handful websites a week containing a couple of 1000 pages each. Which open source Java library would you recommend considering: speed multithreading (or even distributed) extending it with new functionality active maintained and documentation?

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• Server getting overloaded

  - by taras

  Hi, I have 2 setups tomcat5.5.20 on Redhat and mysql 4.1.22 on another Redhat server. Recently my webserver started getting overloaded up to 80-90%. After checking i found repeating errors(each seconds) in catalina.out. Can it cause the server overload or where else can be the root of the problem ? catalina.out: DBCP object created 2010-12-22 13:33:12 by the following code was never closed: java.lang.Exception at org.apache.tomcat.dbcp.dbcp.AbandonedTrace.init(AbandonedTrace.java:96) i have to restart tomcat once a day when server load reaches 80-90%. Also catalina.out file is growing too fast which every few hours need to clear the logs. My datasource config: <bean id="myDataSource" class="org.apache.tomcat.dbcp.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName"> <value>com.mysql.jdbc.Driver</value> </property> jdbc:mysql://XXX/XXX?autoReconnect=true 20 20 <property name="maxIdle"> <value>50</value> </property> <property name="maxActive"> <value>50</value> </property> <property name="removeAbandoned"> <value>false</value> </property> <property name="removeAbandonedTimeout"> <value>2400</value> </property> <property name="username"> <value>XXX</value> </property> <property name="password"> <value>XXX</value> </property> </bean> Thanks for any direction.

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• Enabling JMX for proxool with tomcat

  - by dialt0ne

  I am trying to get proxool's MBeans available so that I can see/manipulate them with jconsole. I have jconsole working, but I don't see anything related to proxool. The system is using Sun Java 1.5.0_17 (I know, I know... I'm working with the developers to upgrade). JMX is enabled by modifying $JAVA_OPTS in my tomcat 5.5 startup script: SJO="$SJO -Dcom.sun.management.jmxremote" SJO="$SJO -Dcom.sun.management.jmxremote.port=4998" SJO="$SJO -Dcom.sun.management.jmxremote.authenticate=false" SJO="$SJO -Dcom.sun.management.jmxremote.ssl=false" JAVA_OPTS="$JAVA_OPTS $SJO" I have proxool configured with JNDI in server.xml: <GlobalNamingResources> <Resource name="jdbc/database" auth="Container" type="javax.sql.DataSource" factory="org.logicalcobwebs.proxool.ProxoolDataSource" user="username" password="password" proxool.driver-url="jdbc:oracle:thin:@fqdn.example.com:1521:MYSID" proxool.driver-class="oracle.jdbc.driver.OracleDriver" proxool.alias="mysid" proxool.maximum-connection-count="20" proxool.statistics="20s,5m,15m" proxool.statistics-log-level="INFO" proxool.jmx="true" proxool.verbose="true" /> </GlobalNamingResources> My test .jsp can run queries and I can see it using the connections with the proxool admin servlet, but I'm unsure if there's more I need to configure in tomcat or proxool to get JMX functioning. Advice? jmxproxy info edit: The jmxproxy servlet is working - when I go to the URL http://tomcatserver.example.com:4999/manager/jmxproxy/?qry=*:type%3DRequestProcessor,* the results are: OK - Number of results: 2 Name: Catalina:type=RequestProcessor,worker=http-8080,name=HttpRequest0 modelerType: org.apache.coyote.RequestInfo bytesSent: 0 requestBytesSent: 0 contentLength: -1 bytesReceived: 0 requestProcessingTime: 1297983483666 globalProcessor: org.apache.coyote.RequestGroupInfo@32dc51c8 requestBytesReceived: 0 serverPort: -1 stage: 0 requestCount: 0 maxTime: 0 processingTime: 0 errorCount: 0 Name: Catalina:type=RequestProcessor,worker=jk-127.0.0.1-8009,name=JkRequest794 modelerType: org.apache.coyote.RequestInfo virtualHost: tomcatserver.example.com bytesSent: 0 method: GET remoteAddr: 172.30.3.51 requestBytesSent: 0 contentLength: -1 workerThreadName: TP-Processor15 bytesReceived: 0 requestProcessingTime: 9 globalProcessor: org.apache.coyote.RequestGroupInfo@1e7d3b8e protocol: HTTP/1.1 currentQueryString: qry=*%3Atype%3DRequestProcessor%2C* requestBytesReceived: 0 serverPort: 4999 stage: 3 requestCount: 0 maxTime: 0 processingTime: 0 currentUri: /manager/jmxproxy/ errorCount: 0 And more to the point http://tomcatserver.example.com:4999/manager/jmxproxy/?qry=Catalina:type%3DEnvironment,resourcetype%3DGlobal,name%3DProxool yields: OK - Number of results: 0

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• SQL Server, Remote Stored Procedure, and DTC Transactions

  - by marc

  Our organization has a lot of its essential data in a mainframe Adabas database. We have ODBC access to this data and from C# have queried/updated it successfully using ODBC/Natural "stored procedures". What we'd like to be able to do now is to query a mainframe table from within SQL Server 2005 stored procs, dump the results into a table variable, massage it, and join the result with native SQL data as a result set. The execution of the Natural proc from SQL works fine when we're just selecting it; however, when we insert the result into a table variable SQL seems to be starting a distributed transaction that in turn seems to be wreaking havoc with our connections. Given that we're not performing updates, is it possible to turn off this DTC-escalation behavior? Any tips on getting DTC set up properly to talk to DataDirect's (formerly Neon Systems) Shadow ODBC driver?

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• Is this way of using Excel 2007 Pivot table for BI scalable ?

  - by Sim

  Hi all, Background: We need to consolidate sales data across the country to do analysis Our Internet connection/IT expertise/IT investment is not quite strong, therefore full BI solution is out of question I tried several SaaS BI solution (GoodData, ZohoReports) and while they're good, they seem not to fully support what we need We're looking at 'bout 2 millions record for every 2 months My current approach Our (10) sites currently gathers data from all their branches and consolidate them into 1 Excel file with Pivot table and embed source data In HQ, I will request 10 sites to send back those Excel files periodically We will import those Excel to our MSSQL server There will be a master Excel file, that will also have the same pivot table (as those came from site Excel file), and datasource is the MSSQL server More details For testing, I currently use MSSQL 2008 Express on my laptop So far, I imported our transactions for the past 2 months and there are 2 millions+ row in 1 table in MSSQL (we just use 1 table, corresponding to our common pivot table structure). DB size is ~ 600 MB In the master Excel file, if not including the source data, it's just < 10MB. Including the source data will increase the size to 60 MB (so I supposed Office 2007 automatically zip the data ?) I try using the Pivot (drag-and-drop fields) and the performance so far is OK (my laptop specs: C2D T7200, 3GB RAM, Windows XP) So my question is : If we're looking at full year transaction (roughly 15 millions rows in MSSQL 2008 Express, 3.6 GB in size), is there any issue with that 15 million rows in 1 table in SQL Express ? Is there any performance issue with the pivot table at that time ? Can it still embed the source data ? (I google-ed but didn't find the maximum size of source data Excel 2007 can embed) Any other suggestions on how we can better do this ? Given that we can't afford the full BI solution, any light-weight/budget/SaaS BI that you can recommend ? Thanks

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• git: having 2 push/pull repos in sync (or 1 push/pull and 1 pull in sync)

  - by xavjuan

  Hello, We work on multiple geographically seperate sites. Today I have our git clones all live on one site A. Then users from site B have to ssh over to do a git clone or to push in changes. These are bare repos where the update is through pushes. Ideally, for git clone/push performance, I'd like to limit having to go over ssh. I'd like to have a copy of git repo X live on site A and site B... and have some syncing mechanism between them. OR to have X live on both sites, but only allow pushing to A (and have that setup correctly at clone time on B) I'm worried about the case where someone on site A pushes changes to the repo at site A at the same time that someone on site B pushes a truely conflicting change to the repo at site B. Is there some 'sync'ing solution built into git for distributed open repos like this? Or a way to have a clone from X set the origin/parent to the X from the other site? thanks, -John

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• php cache zend framework

  - by msaif

  server side is PHP + zend framework. problem: i have huge of data appox 5000 records and no of columns are 5 in input.txt file. i like to read all data into memory only once and send some data to the every browser request. but if i update that input.txt file then updated data must be auto synchronized to that memory location. so i need to solve that problem by using memory caching technique.but caching technique has expire time.but if input.txt is updated before cache expire then i need to auto synchronize to that memory location. now i am using zend framework 1.10.is it possible in zend framework. can anybody give me some line of code of zendfrmawork i have no option to use memchached server(distributed). Only zend framwork.

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• List of private iPhone APIs?

  - by diego nunes

  . . Hi there, everybody. . . I need to do an app to be distributed ad hoc (it doesn't need to go to the store) but I need to get the information about the "data usage" (gprs/3g traffic). It is available on the system, but there is no official API call to get that info. One app made it through Apple testing (it's called "Download Meter"), though, and I emailed the guys to see if they would share the call, but they were not in that mood. . . Is there any list of private APIs or anything like that? Does anyone have any ideas of how could I get that info? Again: the app doesn't need to go to the store, but I need to install it on stock iPhone (ad hoc will do). . Thanks.

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• Load balancer - how to write one for a custom application?

  - by Poni

  Hi! I've written a simple server application which will run distributed on several machines. My question is how does a network load balancer works, in general? I've heard of round-robin and other algorithms, but what I haven't got answer to is how does the process really goes? In socket terms. The client connects to one of the load balancer machines, asks for a "free-to-connect-to" server and simply connects to it? That's the simpliest way I can think of. .. or, does it use the load balancer as a proxy (that implies that all the NBs must be always connected to the application servers, and data is transferred through them)? It's more of a general question. How would you do this? Thank you all!

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• Would Mercurial help me work from 2 PCs?

  - by rikh

  I currently use Perforce for source control, but want to start working on the code from 2 different PCs at the same time (desktop and laptop). The laptop would not be able to access the perforce server very often, which makes Perforce a poor choice in this setup. Distributed source control tools like Mercurial seem better suited to the task, but I am still not clear if this would work or not. Does anyone have any experience of using Mercurial to work on 2 machines at once (eg desktop in the week, laptop in evening and weekends). Does it help, or is it still a pain the butt keeping everything in sync and knowing what is going on.

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• What is the best way to password protect folder/page using php without a db or username

  - by Salt Packets

  What is the best way to password protect folder using php without a database or user name but using. Basically I have a page that will list contacts for organization and need to password protect that folder without having account for every user . Just one password that gets changes every so often and distributed to the group. I understand that it is not very secure but never the less I would like to know how to do this. In the best way. It would be nice if the password is remembered for a while once user entered it correctly.

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• Is it possible to partition more than one way at a time in SQL Server?

  - by meeting_overload

  I'm considering various ways to partition my data in SQL Server. One approach I'm looking at is to partition a particular huge table into 8 partitions, then within each of these partitions to partition on a different partition column. Is this even possible in SQL Server, or am I limited to definining one parition column+function+scheme per table? I'm interested in the more general answer, but this strategy is one I'm considering for Distributed Partitioned View, where I'd partition the data under the first scheme using DPV to distribute the huge amount of data over 8 machines, and then on each machine partition that portion of the full table on another parition key in order to be able to drop (for example) sub-paritions as required.

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• Building Cocoa UIs for OS X with C# and Mono

  - by Antony Perkov

  Has anyone spent any time comparing the various Objective C bridges and associated Cocoa wrappers for Mono? I want to port an existing C# application to run on OS X. Ideally I'd run the application on Mono, and build a native Cocoa UI for it. I'm wondering which bridge would be the best choice. In case it's useful to anyone, here are some links to bridges I've found so far: CocoSharp - distributed with Mono on OS X - www.cocoa-sharp.com Monobjc - better documentation than the others (in my opinion) - www.mono-project.com/CocoaSharp and www.monobjc.net NObjective - (apparently) faster than the others - code.google.com/p/nobjective MObjc / MCocoa - code.google.com/p/mobjc and code.google.com/p/mcocoa ObjC# - www.mono-project.com/ObjCSharp

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• FileInputStream for a generic file System

  - by Akhil

  I have a file that contains java serialized objects like "Vector". I have stored this file over Hadoop Distributed File System(HDFS). Now I intend to read this file (using method readObject) in one of the map task. I suppose FileInputStream in = new FileInputStream("hdfs/path/to/file"); wont' work as the file is stored over HDFS. So I thought of using org.apache.hadoop.fs.FileSystem class. But Unfortunately it does not have any method that returns FileInputStream. All it has is a method that returns FSDataInputStream but I want a inputstream that can read serialized java objects like vector from a file rather than just primitive data types that FSDataInputStream would do. Please help!

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• amazon design doubt

  - by praveen

  I was looking at the amazon website and was wondering how one of the feature would have been implemented. The feature : what customers buy after viewing a particular item. If i were to develop such a feature i would probably generate a session id for each user session and store the session id-page id combination in a log file. and if a book is bought set a separate flag for the session id-page id. A separate program can then be run on the log file periodically, to identify the groups that were bought together/viewed together and that information can be stored in a persistent file. This is ofcourse a simple solution without taking into consideration the distributed nature of the servers - but would this suffice or can you help me identify a better design.

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• Plugin architecture in .net: unloading

  - by henchman

  Hello everybody, I need to implement a plugin architecture within c#/.net in order to load custom user defined actions data type handling code for a custom data grid / conversion / ... from non-static linked assembly files. Because the application has to handle many custom user defined actions, Iam in need for unloading them once executed in order to reduce memory usage. I found several good articles about plugin architectures, eg: ExtensionManager PluginArchitecture ... but none of them gave me enough sausage for properly unloading an assembly. As the program is to be distributed and the user defined actions are (as the name states) user defined: how to i prevent the assembly from executing malicious code (eg. closing my progra, deleting files)? Are there any other pitfalls one of you has encountered?

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• XML over HTTP with JMS and Spring

  - by Will Sumekar

  I have a legacy HTTP server where I need to send an XML file over HTTP request (POST) using Java (not browser) and the server will respond with another XML in its HTTP response. It is similar to Web Service but there's no WSDL and I have to follow the existing XML structure to construct my XML to be sent. I have done a research and found an example that matches my requirement here. The example uses HttpClient from Apache Commons. (There are also other examples I found but they use java.net networking package (like URLConnection) which is tedious so I don't want to use them). But it's also my requirement to use Spring and JMS. I know from Spring's reference that it's possible to combine HttpClient, JMS and Spring. My question is, how? Note that it's NOT in my requirement to use HttpClient. If you have a better suggestion, I'm welcome. Appreciate it. For your reference, here's the XML-over-HTTP example I've been talking about: /* * $Header: * $Revision$ * $Date$ * ==================================================================== * * Copyright 2002-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * * [Additional notices, if required by prior licensing conditions] * */ import java.io.File; import java.io.FileInputStream; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.methods.InputStreamRequestEntity; import org.apache.commons.httpclient.methods.PostMethod; /** * * This is a sample application that demonstrates * how to use the Jakarta HttpClient API. * * This application sends an XML document * to a remote web server using HTTP POST * * @author Sean C. Sullivan * @author Ortwin Glück * @author Oleg Kalnichevski */ public class PostXML { /** * * Usage: * java PostXML http://mywebserver:80/ c:\foo.xml * * @param args command line arguments * Argument 0 is a URL to a web server * Argument 1 is a local filename * */ public static void main(String[] args) throws Exception { if (args.length != 2) { System.out.println( "Usage: java -classpath <classpath> [-Dorg.apache.commons."+ "logging.simplelog.defaultlog=<loglevel>]" + " PostXML <url> <filename>]"); System.out.println("<classpath> - must contain the "+ "commons-httpclient.jar and commons-logging.jar"); System.out.println("<loglevel> - one of error, "+ "warn, info, debug, trace"); System.out.println("<url> - the URL to post the file to"); System.out.println("<filename> - file to post to the URL"); System.out.println(); System.exit(1); } // Get target URL String strURL = args[0]; // Get file to be posted String strXMLFilename = args[1]; File input = new File(strXMLFilename); // Prepare HTTP post PostMethod post = new PostMethod(strURL); // Request content will be retrieved directly // from the input stream // Per default, the request content needs to be buffered // in order to determine its length. // Request body buffering can be avoided when // content length is explicitly specified post.setRequestEntity(new InputStreamRequestEntity( new FileInputStream(input), input.length())); // Specify content type and encoding // If content encoding is not explicitly specified // ISO-8859-1 is assumed post.setRequestHeader( "Content-type", "text/xml; charset=ISO-8859-1"); // Get HTTP client HttpClient httpclient = new HttpClient(); // Execute request try { int result = httpclient.executeMethod(post); // Display status code System.out.println("Response status code: " + result); // Display response System.out.println("Response body: "); System.out.println(post.getResponseBodyAsString()); } finally { // Release current connection to the connection pool // once you are done post.releaseConnection(); } } }

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