java - Where do you close a writer in TwitterStream? -


i'm working on compiling bunch of tweets information retrieval class. i'm trying using both rest api , streaming api through twitter4j. when using streaming api, use following modifications this example:

final limitedfilewriter output = new limitedfilewriter("tweets","tweets"); twitterstream twitterstream = new twitterstreamfactory(cb.build()).getinstance();     statuslistener listener = new statuslistener() {         @override         public void onstatus(status status) {             try{                 output.write("@" + status.getuser().getscreenname() + " -- " + status.gettext()+"\n");             }             catch(ioexception e){                 e.printstacktrace();             }         }     }      twitterstream.addlistener(listener);     twitterstream.sample("en");     //output.close();

it seems can't ever close writer. writer using wraps bufferedwriter, while keeping track of file size. if file exceeds size (128mb), writer close current file , create new file. here relevant class functions:

public void write(string s) throws ioexception {     if(byteswritten + s.getbytes(charset).length >= maxsize){         output.close();         byteswritten = 0;         filenum++;         string filename = directory + "/" + basename+fmt.format(filenum);         currentfile = new file(filename);         output = new bufferedwriter             (new outputstreamwriter(new fileoutputstream(filename),charset));     }      output.write(s);     byteswritten += s.getbytes(charset).length;  }  public void close() throws ioexception{     output.close(); }

if try close writer after twitterstream.sample() (commented out), program crashes because trying write closed file. if understanding correct, because twitterstream class creates new thread runs concurrently main thread. then, main thread closes stream , twitterstream can no longer write it.

if that's case, should close writer?

if have understood question correctly, want able turn of tweets collection @ point, close open file writers , have clean exit. achieve can use synchronized block.

final object lock = new object(); final limitedfilewriter output = new limitedfilewriter("tweets","tweets"); twitterstream twitterstream = new twitterstreamfactory(cb.build()).getinstance(); statuslistener listener = new statuslistener() {     @override     public void onstatus(status status) {         try{         output.write("@" + status.getuser().getscreenname() + " -- " + status.gettext()+"\n");         // free lock         if (some_condition_like_i_have_enough_files) {             synchronized (lock) {                 lock.notify();             }         }         catch(ioexception e){             e.printstacktrace();         }     } }  twitterstream.addlistener(listener); twitterstream.sample("en");  try {     synchronized (lock) {         lock.wait();     } } catch (interruptedexception e) {     e.printstacktrace(); } // close twitterstream // close writer

-

Popular posts from this blog

c# - ODP.NET Oracle.ManagedDataAccess causes ORA-12537 network session end of file -

overview i want replace oracle.dataaccess orcale. managed dataaccess, opening connection latter throws ora-12537 network session end of file exception. exception message / stack trace {oracleinternal.network.networkexception (0x000030f9): ora-12537 : netzwerksession: dateiende @ oracleinternal.network.readerstream.read(orabuf ob) @ oracleinternal.ttc.orabufreader.getdatafromnetwork() @ oracleinternal.ttc.orabufreader.read(boolean bignoredata) @ oracleinternal.ttc.marshallingengine.unmarshalub1(boolean bignoredata) @ oracleinternal.ttc.ttcprotocolnegotiation.readresponse()} i trying connect oracle 11g database , not have client installed on local machine. working test application (unmanaged) using oracle.dataaccess works fine . using system; using oracle.dataaccess.client; namespace app.odp.unmanaged { internal class program { private static void main(string[] args) { //dummy connection string...
Read more

matlab - Compression and Decompression of ECG Signal using HUFFMAN ALGORITHM -

i want compress , decompress ecg signal stored text message text file , find out file size, cr,prd ratio,and qs. here code compression , decompression of ecg signal using huffman algorithm. i'm trying find out file size, compression ratio,prd ratio,qs. but error i'm getting the ecg file in text format. %clearing variables , screen enter code here clear all; close all; clc; [file1]=uigetfile('*.txt'); %fprintf('enter ecg file name :%s',file1); p=file1; t=sprintf('%s',p); b1=dlmread([file1]); len=length(b1); lead=input('enter lead number :'); %lead=str2double(lead); col2=b1(1:end,lead); e=fix(sqrt(len)); m=1; i=1:e j=1:e g2(i,j)=fix(col2(m)*1000); %amplifying 1000 m=m+1; end end g3=g2; i=1:e j=1:e ...
Read more

utf 8 - split utf-8 string into bytes in python -

i trying split utf-8 string bytes in python 3. problem is, when use bytearray, byte, encode etc functions array size of element 14 bytes, not 1 byte expected. need split text file sequence of bytes , send them byte after byte using sockets. tried this: infile = open (file, "r") str = infile.read() byte_str = bytes(str, 'utf-8') print("size of byte_str",sys.getsizeof(byte_str[0])) print gives me 14, need 1... suggestion? quoting official documentation : sys.getsizeof(object[, default]) return size of object in bytes. object can type of object. built-in objects return correct results, not have hold true third-party extensions implementation specific. only memory consumption directly attributed object accounted for, not memory consumption of objects refers to. if given, default returned if object not provide means retrieve size. otherwise typeerror raised. getsizeof() calls object’s __sizeof__ method , adds ...
Read more