anirudh goel - Page 5 - Developer IT

Java - Does null variable require space in memory

- by Yatendra Goel

class CheckStore { private String displayText; private boolean state; private String meaningfulText; private URL url; public CheckStore(String text, boolean state) { this.displayText = text; this.state = state; } : : } As I am initializing only two variables (displayText and state) in the constructor, Will the rest two variables (meaningfulText and url which will have the value null) will require space in memory to store null value. Q1. I think they will require space. If they will, then how much memory does a null value takes in the memory (like int takes 4 bytes). Q2. How much space a string takes in memory. I guess it will depend on the length of the string. So how much space a string takes of how much length?

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Java - Thread - Problem in one of the Sun's tutorial

- by Yatendra Goel

I was reading this Sun's tutorial on Thread. I found a block of code there which I think can be replaced by a code of fewer lines. I wonder why Sun's expert programmers followed that long way when the task can be accomplished with a code of fewer lines. I am asking this question so as to know that if I am missing something that the tutorial wants to convey. The block of code is as follows: t.start(); threadMessage("Waiting for MessageLoop thread to finish"); //loop until MessageLoop thread exits while (t.isAlive()) { threadMessage("Still waiting..."); //Wait maximum of 1 second for MessageLoop thread to //finish. t.join(1000); if (((System.currentTimeMillis() - startTime) > patience) && t.isAlive()) { threadMessage("Tired of waiting!"); t.interrupt(); //Shouldn't be long now -- wait indefinitely t.join(); } } threadMessage("Finally!"); I think that the above code can be replaced by the following: t.start(); t.join(patience); // InterruptedException is thrown by the main method so no need to handle it if(t.isAlive()) { // t's thread couldn't finish in the patience time threadMessage("Tired of waiting!"); t.interrupt(); t.join(); } threadMessage("Finally!");

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What does this statement mean ? printf("[%.*s] ", (int) lengths[i],

- by Vivek Goel

I was reading this page http://dev.mysql.com/doc/refman/5.0/en/mysql-fetch-row.html there is one line printf("[%.*s] ", (int) lengths[i], row[i] ? row[i] : "NULL"); from code MYSQL_ROW row; unsigned int num_fields; unsigned int i; num_fields = mysql_num_fields(result); while ((row = mysql_fetch_row(result))) { unsigned long *lengths; lengths = mysql_fetch_lengths(result); for(i = 0; i < num_fields; i++) { printf("[%.*s] ", (int) lengths[i], row[i] ? row[i] : "NULL"); } printf("\n"); } what does [%.*s] mean in that code ?

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Eclipse UML plugin?

- by Yatendra Goel

I want a UML modelling tool, preferably as an eclipse plugin that can perform the following: model UML diagrams Generate stub java code from the diagrams

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Use of select or multithread for almost 80 or more clients?

- by Tushar Goel

I am working on one project in which i need to read from 80 or more clients and then write their o/p into a file continuously and then read these new data for another task. My question is what should i use select or multithreading? Also I tried to use multi threading using read/fgets and write/fputs call but as they are blocking calls and one operation can be performed at one time so it is not feasible. Any idea is much appreciated. update 1: I have tried to implement the same using condition variable. I able to achieve this but it is writing and reading one at a time.When another client tried to write then it cannot able to write unless i quit from the 1st thread. I do not understand this. This should work now. What mistake i am doing? Update 2: Thanks all .. I am able to succeeded to get this model implemented using mutex condition variable. updated Code is as below: **header file******* char *mailbox ; pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER ; pthread_cond_t writer = PTHREAD_COND_INITIALIZER; int main(int argc,char *argv[]) { pthread_t t1 , t2; pthread_attr_t attr; int fd, sock , *newfd; struct sockaddr_in cliaddr; socklen_t clilen; void *read_file(); void *update_file(); //making a server socket if((fd=make_server(atoi(argv[1])))==-1) oops("Unable to make server",1) //detaching threads pthread_attr_init(&attr); pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED); ///opening thread for reading pthread_create(&t2,&attr,read_file,NULL); while(1) { clilen = sizeof(cliaddr); //accepting request sock=accept(fd,(struct sockaddr *)&cliaddr,&clilen); //error comparison against failire of request and INT if(sock==-1 && errno != EINTR) oops("accept",2) else if ( sock ==-1 && errno == EINTR) oops("Pressed INT",3) newfd = (int *)malloc(sizeof(int)); *newfd = sock; //creating thread per request pthread_create(&t1,&attr,update_file,(void *)newfd); } free(newfd); return 0; } void *read_file(void *m) { pthread_mutex_lock(&lock); while(1) { printf("Waiting for lock.\n"); pthread_cond_wait(&writer,&lock); printf("I am reading here.\n"); printf("%s",mailbox); mailbox = NULL ; pthread_cond_signal(&writer); } } void *update_file(int *m) { int sock = *m; int fs ; int nread; char buffer[BUFSIZ] ; if((fs=open("database.txt",O_RDWR))==-1) oops("Unable to open file",4) while(1) { pthread_mutex_lock(&lock); write(1,"Waiting to get writer lock.\n",29); if(mailbox != NULL) pthread_cond_wait(&writer,&lock); lseek(fs,0,SEEK_END); printf("Reading from socket.\n"); nread=read(sock,buffer,BUFSIZ); printf("Writing in file.\n"); write(fs,buffer,nread); mailbox = buffer ; pthread_cond_signal(&writer); pthread_mutex_unlock(&lock); } close(fs); }

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Linq to XSD processing

- by goel

For Typed Xml to Linq processing ,do i need to download Linq to XSD alpha installer or is it available in VS 2008 ? (I am using VS 2008 Professional edition).

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Java - java.util.List problem

- by Yatendra Goel

I have a java.util.ArrayList<Item> and an Item object. Now, I want to obtain the number of times the Item is stored in the arraylist. I know that I can do arrayList.contains() check but it returns true, irrespective of whether it contains one or more Items. Q1. How can I find the number of time the Item is stored in the list? ================================================================================== Q2. Also, If the list contains more than one Item, then how can I determine the index of other Items because arrayList.indexOf(item) returns the index of only first Item every time?

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Netbeans configuration problem

- by Yatendra Goel

I am using Netbeans 6.8 The problem is that the projects explorer (that displays all the projects and their contents) displays each package as a node. For instance, if there is package hierarchy like this; com.mycompany.myproject.package1.package1.1 then it displays 5 nodes for the five packages which is very disturbing while development. Is there any way by which I can configure it(Netbeans) so that it groups all the subpackages of a package under one node and displays the subpackages only when I expand the package node?

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ArchBeat Link-o-Rama for 11/16/2011

- by Bob Rhubart

Size, Failure, and Optimization | Roger Sessions The slide deck from Roger Sessions' keynote address at the 2nd IT Architect Regional Conference in Bogota, Colombia. Webcast: Oracle Business Intelligence Mobile Event Date: Tuesday, November 29, 2011 Time: 9 a.m. PT/12 noon ET Featuring Manan Goel (Director BI Product Marketing, Oracle) and Shailesh Shedge (Director BI & Analytics Practice, Ascentt). Live Webinar: Solutions for MySQL High Availability (November 29) Tune into this webcast to learn how MySQL’s High Availability solution can help you minimize downtime and ensure business continuity. Domain-Driven Design: Useful Models for Complex Problems | @ericevans0 Domain-Driven Design: Useful Models for Complex Problems | Eric Evans Eric Evans' slide deck from the recent IASA event in Spain. Oracle Hardware goes social Introducing the Oracle Hardware Social Media Hub -- The new Facebook meeting place for the global hardware community. The hub now features a pioneering Q&A app called Oracle Ask the Expert, where you can ask questions and engage with Oracle experts. Review: WebLogic Server 11g Administration Handbook by S. Alapati Dr. Frank Munz, author of "Middleware and Cloud Computing, reviews the new WebLogic book by Sam Alapati and offers a quick overview of a couple of other new titles. SOA All the Time; Architects in AZ; Clearing Info Integration hurdles This week on the Architect Home Page on OTN.

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ArchBeat Link-o-Rama for 2012-03-21

- by Bob Rhubart

Webcast: Simplify Oracle RAC Deployment with Oracle VM event.on24.com Tuesday March 20, 2012 - 9am PT / Noon ET Learn how you can: Deploy an Oracle (RAC) Database environment in minutes with Oracle VM templates Create, deploy or convert existing systems into highly available cluster environments Instantly respond to changing demand by relocating resources between servers Speakers: Ronen Kofman – Product Management Director, Oracle Markus Michalewicz – Senior Principal Product Manager, Oracle Webcast: Oracle Business Intelligence Mobile event.on24.com Event Date: Wednesday, March 28, 2012 Time: 10 a.m. PT / 1 p.m. ET Speakers: Pete Manhardt – Director Enterprise Information at Smiths Group, plc Shailesh Shedge – Director BI & Analytics Practice at Ascentt Manan Goel – Director BI Product Marketing at Oracle Seth's Blog: The extraordinary software development manager sethgodin.typepad.com "Being good at programming is insufficient qualification for becoming a world class software project manager/leader," says marketing guru Seth Godin. Mismatch: Developer skills and customer demands | Floyd Teter orclville.blogspot.com "Those of us in the developer community may need to reconsider the law of supply and demand," says Oracle ACE Director Floyd Teter, "and get on with the process of matching our skills to the demands of our customers." SOA gets mobilized; mobile gets SOA-ized: survey | Joe McKendrick www.zdnet.com "Maybe mobile is the killer app for SOA that actually will convince people to adopt the architectural style." Integrating with Oracle Fusion Applications: Discovering Integration Artifacts | Rajesh Raheja rraheja.wordpress.com Rajesh Raheja briefly discusses "the ease with which integrations are now possible using standards-based technologies with enterprise applications." Chargeback and showChargeback and showback...both a 'throw back' | Tom Laszewski blogs.oracle.com Tom Laszeski discusses strategies for tracking and applying the costs of "IT services, hardware or software to the business unit in which they are used." GlassFish 4.0 Virtualization Progress - VirtualBox | The Aquarium blogs.oracle.com Want to spawn GlassFish instances as VirtualBox virtual machines? The Aquarium shares resources that will help you get it done. Thought for the Day "Spring is the time of plans and projects." — Leo Tolstoy

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ArchBeat Link-o-Rama for 11/17/2011

- by Bob Rhubart

Building an Infrastructure Cloud with Oracle VM for x86 + Enterprise Manager 12c | Richard Rotter Richard Rotter demonstrates "how easy it could be to build a cloud infrastructure with Oracle's solution for cloud computing." Article: Social + Lean = Agile | Dave Duggal In today’s increasingly dynamic business environment, organizations must continuously adapt to survive. Change management has become a major bottleneck. Organizations’ need a practical mechanism for managing controlled variance and change in-flight to break the logjam. This paper provides a foundation for applying lean and agile principles to achieve Enterprise Agility through social collaboration. Stress Testing Java EE 6 Applications - Free Article In Free Java Magazine : Adam Bien "It is strange," says Adam Bien, "everyone is obsessed about green bars and code coverage, but testing of multi threaded behavior is widely ignored - until the applications run into massive problems." Using Access Manager to Secure Applications Deployed on WebLogic | Rene van Wijk Another great how-to post from Oracle ACE Rene van Wijk, this time involving JBoss RichFaces, Facelets, Oracle Coherence, and Oracle WebLogic Server. DOAG 2011 vs. Devoxx - Value and Attraction | Markus Eisele Oracle ACE Director Markus Eisele compares and contrasts these popular conferences with the aim of helping others decide which to attend. SOA All the Time; Architects in AZ; Clearing Info Integration hurdles SOA all the Time; Architects in AZ; Clearing Info Integration Hurdles This week on the Architect Home Page on OTN. Webcast: Oracle Business Intelligence Mobile Event Date: Wednesday, December 7, 2011 Time: 10 a.m. PT/1 p.m. ET Featuring Manan Goel (Director BI Product Marketing, Oracle) and Shailesh Shedge (Director BI and Analytics Practice, Ascentt). Webcast: Maximum Availability on Private Clouds A discussion of Oracle’s Maximum Availability Architecture, Oracle Database 11g, Oracle Exadata Database Machine, and Oracle Database appliance, featuring Margaret Hamburger (Director, Product Marketing, Oracle) and Joe Meeks (Director, Product Management, Oracle). November 30, 2011 at 10:00am PT / 1:00pm ET. Oracle Technology Network Architect Day - Phoenix, AZ Wednesday December 14, 2011, 8:30am - 5:00pm. The Ritz-Carlton, Phoenix, 2401 East Camelback Road, Phoenix, AZ 85016. Registration is free, but seating is limited.

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