yusuke nakamura - Page 4

Twitter ?? Nashorn ????

- by Homma

????? ??? jlaskey ??? Nashorn Blog ????????????? https://blogs.oracle.com/nashorn/entry/nashorninthe_twitterverse ???????? ?? Nashorn ?????????????????????????????????Project Nashorn ???????????Nashorn ?????????????????????Nashorn ???????????????????????????????????????????????????????????????????????????????????????????????????????? ??????? Nashorn + Java ???????????????????Java ?? Twitter4J https://github.com/yusuke/twitter4j ?????????????????Twitter ?????????????????bin/getAccessToken.sh ?????twitter4j.properties ????????????????????????????????? nashorn -cp $TWITTER4J/twitter4j-core-3.0.1.jar GetHomeTimeline.js GetHomeTimeline.js ????????? var twitter4j = Packages.twitter4j; var TwitterFactory = twitter4j.TwitterFactory; var Query = twitter4j.Query; var twitter = new TwitterFactory().instance; var query = new Query("nashorn OR nashornjs"); query.count = 100; do { var result = twitter.search(query); var tweets = result.tweets; for each (tweet in tweets) { print("@" + tweet.user.screenName + "\t" + tweet.text); } } while (query = result.nextQuery()); ?????????????? JavaFX ???????????????????????...

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good books on numerical computation with C

- by yCalleecharan

Hi, I've read the post "What is the best book on numerical methods?" and I wish to ask more or less the same question but in relation to C programming. Most of the time, C programming books on numerical methods are just another version of the author's previous Fortran book on the same subject. I've seen Applied numerical methods in C by Nakamura, Shoichiro and the C codes are not good programming practice. I've heard bad comments about Numerical Recipes by Press. Do you know good books on C that discusses numerical methods. It's seem better for me to ask about good books on C discussing numerical methods than rather asking books on numerical methods that discusses C. I've heard about Numerical Algorithms with C by Giesela Engeln-Müllges and A Numerical Library in C for Scientists and Engineers bu Lau but haven't read them. Good books will always have algorithms implemented in the programming language in a smart way. Thanks a lot...

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An Actor "queue" ?

- by synic

In Java, to write a library that makes requests to a server, I usually implement some sort of dispatcher (not unlike the one found here in the Twitter4J library: http://github.com/yusuke/twitter4j/blob/master/twitter4j-core/src/main/java/twitter4j/internal/async/DispatcherImpl.java) to limit the number of connections, to perform asynchronous tasks, etc. The idea is that N number of threads are created. A "Task" is queued and all threads are notified, and one of the threads, when it's ready, will pop an item from the queue, do the work, and then return to a waiting state. If all the threads are busy working on a Task, then the Task is just queued, and the next available thread will take it. This keeps the max number of connections to N, and allows at most N Tasks to be operating at the same time. I'm wondering what kind of system I can create with Actors that will accomplish the same thing? Is there a way to have N number of Actors, and when a new message is ready, pass it off to an Actor to handle it - and if all Actors are busy, just queue the message?

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Nashorn in the Twitterverse

- by jlaskey

I have been following how often Nashorn has been showing up on the net. Nashorn got a burst of tweets when we announced Project Nashorn and I was curious how Nashorn was trending per day, maybe graph the result. Counting tweets manually seemed mindless, so why not write a program to do the same. This is where Nashorn + Java came shining through. There is a very nice Java library out there called Twitter4J https://github.com/yusuke/twitter4j that handles all things Twitter. After running bin/getAccessToken.sh to get a twitter4j.properties file with personal authorization, all I had to do to run my simple exploratory app was; nashorn -cp $TWITTER4J/twitter4j-core-3.0.1.jar GetHomeTimeline.js The content of GetHomeTimeline.js is as follows; var twitter4j = Packages.twitter4j; var TwitterFactory = twitter4j.TwitterFactory; var Query = twitter4j.Query; var twitter = new TwitterFactory().instance; var query = new Query("nashorn OR nashornjs"); query.count = 100; do { var result = twitter.search(query); var tweets = result.tweets; for each (tweet in tweets) { print("@" + tweet.user.screenName + "\t" + tweet.text); } } while (query = result.nextQuery()); How easy was that? Now to hook it up to the JavaFX graphing library...

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