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Process Watcher
/**
*
* vpc-commons library
*
* Description: <start><end>
*
* Copyright (C) 2006-2008 Taha BEN SALAH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
/**
*
* <pre>
* Process process = Runtime.getRuntime().exec(new String[]{"/bin/java","-version"}, null, new File("."));
* ProcessWatcher w = new ProcessWatcher(process, new ProcessWatcherHandler() {
* public void started(Process process) {
* System.out.println("Prcess started");
* }
*
* public void stdout(Process process, String line) {
* System.out.println(line);
* }
*
* public void stderr(Process process, String line) {
* System.err.println(line);
* }
*
* public void ended(Process process, int value) {
* System.out.println("Process Shutdown. Exit Value :" + value);
* }
*
* public void error(Process process, Throwable th) {
* System.err.println(th);
* }
* });
* w.start();
* </pre>
* @author Taha Ben Salah (taha.bensalah@gmail.com)
* @creationtime 27 juin 2007 12:08:13
*/
public class ProcessWatcher {
private Process process;
private Thread end;
private Thread out;
private Thread err;
private int result;
private boolean stopped=false;
private ProcessWatcherHandler handler;
public ProcessWatcher(Process theProcess, ProcessWatcherHandler theHandler) {
this.process = theProcess;
this.handler = theHandler;
end=new Thread(){
@Override
public void run() {
try {
result = process.waitFor();
handler.ended(process,result);
} catch (Throwable e) {
handler.error(process,e);
} finally{
stopped=true;
}
}
};
out=new Thread(){
@Override
public void run() {
String read;
BufferedReader in=new BufferedReader(new InputStreamReader(process.getInputStream()));
while (!stopped) {
try {
read = in.readLine();
if (read == null) {
break;
}
handler.stdout(process,read);
} catch (Throwable e) {
handler.error(process,e);
break;
}
}
}
};
err=new Thread(){
@Override
public void run() {
String read;
BufferedReader in=null;
try {
in = new BufferedReader(new InputStreamReader(process.getErrorStream()));
while (!stopped) {
try {
read = in.readLine();
if (read == null) {
break;
}
handler.stderr(process,read);
} catch (Throwable e) {
handler.error(process,e);
break;
}
}
} catch(Throwable e) {
handler.error(process,e);
} finally {
if (in!=null) {
try {
in.close();
} catch (IOException e) {
handler.error(process,e);
}
}
}
}
};
}
public void start(){
handler.started(process);
end.start();
out.start();
err.start();
}
public int waitfor(){
while(!stopped){
Thread.yield();
}
return result;
}
}
/**
*
* vpc-commons library
*
* Description: <start><end>
*
* Copyright (C) 2006-2008 Taha BEN SALAH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/**
* @author Taha Ben Salah (taha.bensalah@gmail.com)
* @creationtime 27 juin 2007 12:08:46
*/
interface ProcessWatcherHandler {
public void started(Process process);
public void stdout(Process process,String line);
public void stderr(Process process,String line);
public void ended(Process process,int value);
public void error(Process process,Throwable th);
}
