Pass string between two threads in java
- by geeta
I have to search a string in a file and write the matched lines to another file.
I have a thread to read a file and a thread to write a file. I want to send the stringBuffer from read thread to write thread. Please help me to pass this. I amm getting null value passed.
write thread:
class OutputThread extends Thread{
/****************** Writes the line with search string to the output file *************/
Thread runner1,runner;
File Out_File;
public OutputThread() {
}
public OutputThread(Thread runner,File Out_File) {
runner1 = new Thread(this,"writeThread"); // (1) Create a new thread.
this.Out_File=Out_File;
this.runner=runner;
runner1.start(); // (2) Start the thread.
}
public void run()
{
try{
BufferedWriter bufferedWriter=new BufferedWriter(new FileWriter(Out_File,true));
System.out.println("inside write");
synchronized(runner){
System.out.println("inside wait");
runner.wait();
}
System.out.println("outside wait");
// bufferedWriter.write(line.toString());
Buffer Buf = new Buffer();
bufferedWriter.write(Buf.buffers);
System.out.println(Buf.buffers);
bufferedWriter.flush();
}
catch(Exception e){
System.out.println(e);
e.printStackTrace();
}
}
}
Read Thraed:
class FileThread extends Thread{
Thread runner;
File dir;
String search_string,stats;
File Out_File,final_output;
StringBuffer sb = new StringBuffer();
public FileThread() {
}
public FileThread(CountDownLatch latch,String threadName,File dir,String search_string,File Out_File,File final_output,String stats) {
runner = new Thread(this, threadName); // (1) Create a new thread.
this.dir=dir;
this.search_string=search_string;
this.Out_File=Out_File;
this.stats=stats;
this.final_output=final_output;
this.latch=latch;
runner.start(); // (2) Start the thread.
}
public void run()
{
try{
Enumeration entries;
ZipFile zipFile;
String source_file_name = dir.toString();
File Source_file = dir;
String extension;
OutputThread out = new OutputThread(runner,Out_File);
int dotPos = source_file_name.lastIndexOf(".");
extension = source_file_name.substring(dotPos+1);
if(extension.equals("zip"))
{
zipFile = new ZipFile(source_file_name);
entries = zipFile.entries();
while(entries.hasMoreElements()) {
ZipEntry entry = (ZipEntry)entries.nextElement();
if(entry.isDirectory()) {
(new File(entry.getName())).mkdir();
continue;
}
searchString(runner,entry.getName(),new BufferedInputStream(zipFile.getInputStream(entry)),Out_File,final_output,search_string,stats);
}
zipFile.close();
}
else
{
searchString(runner,Source_file.toString(),new BufferedInputStream(new FileInputStream(Source_file)),Out_File,final_output,search_string,stats);
}
}
catch(Exception e){
System.out.println(e);
e.printStackTrace();
}
}
/********* Reads the Input Files and Searches for the String ******************************/
public void searchString(Thread runner,String Source_File,BufferedInputStream in,File output_file,File final_output,String search,String stats)
{
int count = 0;
int countw = 0;
int countl=0;
String s;
String[] str;
String newLine = System.getProperty("line.separator");
try
{
BufferedReader br2 = new BufferedReader(new InputStreamReader(in));
//OutputFile outfile = new OutputFile();
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(output_file,true));
Buffer Buf = new Buffer();
//StringBuffer sb = new StringBuffer();
StringBuffer sb1 = new StringBuffer();
while((s = br2.readLine()) != null )
{
str = s.split(search);
count = str.length-1;
countw += count;
if(s.contains(search)){
countl++;
sb.append(s);
sb.append(newLine);
}
if(countl%100==0)
{ System.out.println("inside count");
Buf.setBuffers(sb.toString());
sb.delete(0,sb.length());
System.out.println("outside notify");
synchronized(runner)
{
runner.notify();
}
//outfile.WriteFile(sb,bufferedWriter);
//sb.delete(0,sb.length());
}
}
}
synchronized(runner)
{
runner.notify();
}
br2.close();
in.close();
if(countw == 0)
{
System.out.println("Input File : "+Source_File );
System.out.println("Word not found");
System.exit(0);
}
else
{
System.out.println("Input File : "+Source_File );
System.out.println("Matched word count : "+countw );
System.out.println("Lines with Search String : "+countl);
System.out.println("Output File : "+output_file.toString());
System.out.println();
}
}
catch(Exception e){
System.out.println(e);
e.printStackTrace();
}
}
}
