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/** Notice of modification as required by the LGPL
* This file was modified by Gemstone Systems Inc. on
* $Date$
**/
// $Id: TimedWriter.java,v 1.5 2005/05/30 16:14:45 belaban Exp $
package com.gemstone.org.jgroups.util;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
/**
Waits until the buffer has been written to the output stream, or until timeout msecs have elapsed,
whichever comes first.
TODO: make it more generic, so all sorts of timed commands should be executable. Including return
values, exceptions and Timeout exception. Also use ReusableThread instead of creating a new threa
each time.
@author Bela Ban
*/
public class TimedWriter {
Thread thread=null;
long timeout=2000;
boolean completed=true;
Exception write_ex=null;
Socket sock=null;
static GemFireTracer log=GemFireTracer.getLog(TimedWriter.class);
static/*GemStoneAddition*/ class Timeout extends Exception {
private static final long serialVersionUID = -7263515891440595522L;
@Override // GemStoneAddition
public String toString() {
return "TimedWriter.Timeout";
}
}
class WriterThread extends Thread {
DataOutputStream out=null;
byte[] buf=null;
int i=0;
public WriterThread(OutputStream out, byte[] buf) {
this.out=new DataOutputStream(out);
this.buf=buf;
setName("TimedWriter.WriterThread");
}
public WriterThread(OutputStream out, int i) {
this.out=new DataOutputStream(out);
this.i=i;
setName("TimedWriter.WriterThread");
}
@Override // GemStoneAddition
public void run() {
try {
if(buf != null)
out.write(buf);
else {
out.writeInt(i);
}
}
catch(IOException e) {
write_ex=e;
}
completed=true;
}
}
class SocketCreator extends Thread {
InetAddress local=null, remote=null;
int peer_port=0;
public SocketCreator(InetAddress local, InetAddress remote, int peer_port) {
this.local=local;
this.remote=remote;
this.peer_port=peer_port;
}
@Override // GemStoneAddition
public void run() {
completed=false;
sock=null;
try {
sock=new Socket(remote, peer_port, local, 0); // 0 means choose any port
}
catch(IOException io_ex) {
write_ex=io_ex;
}
completed=true;
}
}
void start(InetAddress local, InetAddress remote, int peer_port) {
stop();
thread=new SocketCreator(local, remote, peer_port);
thread.start();
}
void start(OutputStream out, byte[] buf) {
stop();
thread=new WriterThread(out, buf);
thread.start();
}
void start(OutputStream out, int i) {
stop();
thread=new WriterThread(out, i);
thread.start();
}
void stop() {
if(thread != null && thread.isAlive()) {
thread.interrupt();
try {thread.join(timeout);}
catch(InterruptedException e) {Thread.currentThread().interrupt();} // GemStoneAddition
}
}
/**
Writes data to an output stream. If the method does not return within timeout milliseconds,
a Timeout exception will be thrown.
*/
public synchronized void write(OutputStream out, byte[] buf, long timeout)
throws Exception, Timeout, InterruptedException {
if (Thread.interrupted()) throw new InterruptedException(); // GemStoneAddition
if(out == null || buf == null) {
log.error(ExternalStrings.TimedWriter_TIMEDWRITERWRITE_OUTPUT_STREAM_OR_BUFFER_IS_NULL_IGNORING_WRITE);
return;
}
try {
this.timeout=timeout;
completed=false;
start(out, buf);
if(thread == null)
return;
thread.join(timeout);
if(completed == false) {
throw new Timeout();
}
if(write_ex != null) {
Exception tmp=write_ex;
write_ex=null;
throw tmp;
}
}
finally { // stop the thread in any case
stop();
}
}
public synchronized void write(OutputStream out, int i, long timeout)
throws Exception, Timeout, InterruptedException {
if (Thread.interrupted()) throw new InterruptedException(); // GemStoneAddition
if(out == null) {
log.error(ExternalStrings.TimedWriter_TIMEDWRITERWRITE_OUTPUT_STREAM_IS_NULL_IGNORING_WRITE);
return;
}
try {
this.timeout=timeout;
completed=false;
start(out, i);
if(thread == null)
return;
thread.join(timeout);
if(completed == false) {
throw new Timeout();
}
if(write_ex != null) {
Exception tmp=write_ex;
write_ex=null;
throw tmp;
}
}
finally { // stop the thread in any case
stop();
}
}
/** Tries to create a socket to remote_peer:remote_port. If not sucessful within timeout
milliseconds, throws the Timeout exception. Otherwise, returns the socket or throws an
IOException. */
public synchronized Socket createSocket(InetAddress local, InetAddress remote, int port, long timeout)
throws Exception, Timeout, InterruptedException {
if (Thread.interrupted()) throw new InterruptedException(); // GemStoneAddition
try {
this.timeout=timeout;
completed=false;
start(local, remote, port);
if(thread == null)
return null;
thread.join(timeout);
if(completed == false) {
throw new Timeout();
}
if(write_ex != null) {
Exception tmp=write_ex;
write_ex=null;
throw tmp;
}
return sock;
}
finally { // stop the thread in any case
stop();
}
}
// public static void main(String[] args) {
// TimedWriter w=new TimedWriter();
// InetAddress local=null;
// InetAddress remote=null;
// int port=0;
// Socket sock=null ;
//
// if(args.length != 3) {
// log.error(ExternalStrings.TimedWriter_TIMEDWRITER_LOCAL_HOST_REMOTE_HOST_REMOTE_PORT);
// return;
// }
//
// try {
// local=InetAddress.getByName(args[0]);
// remote=InetAddress.getByName(args[1]);
// port=Integer.parseInt(args[2]);
// }
// catch(Exception e) {
// log.error(ExternalStrings.TimedWriter_COULD_FIND_HOST__0, remote);
// return;
// }
//
// while(true) {
//
// try {
// sock=w.createSocket(local, remote, port, 3000);
// if(sock != null) {
// System.out.println("Connection created");
// return;
// }
// }
// catch(TimedWriter.Timeout t) {
// log.error(ExternalStrings.TimedWriter_TIMED_OUT_CREATING_SOCKET);
// }
// catch (InterruptedException e) { // GemStoneAddition
// return; // we're in a main; just get out
// }
// catch(Exception io_ex) {
// log.error(ExternalStrings.TimedWriter_CONNECTION_COULD_NOT_BE_CREATED_RETRYING);
// try { // GemStoneAddition
// Util.sleep(2000);
// }
// catch (InterruptedException e) {
// return; // we're in a main; just get out...
// }
// }
// }
//
// }
}