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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* @version $Id: SimpleApplication.java 937350 2010-04-23 16:03:39Z sebb $ */
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
//import java.io.UnsupportedEncodingException;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Enumeration;
import java.util.Vector;
public class SimpleApplication implements Runnable {
private ServerSocket server=null;
private Thread thread=null;
private volatile boolean stopping=false;
private String directory=null;
private final Vector handlers;
public static native void toto();
public SimpleApplication()
{
super();
System.err.println("SimpleApplication: instance "+this.hashCode()+
" created");
this.handlers=new Vector();
}
protected void finalize() {
System.err.println("SimpleApplication: instance "+this.hashCode()+
" garbage collected");
}
/**
* Main methos
*/
public static void main(String[] args)
throws Exception
{
SimpleApplication app = new SimpleApplication();
System.err.println("SimpleApplication: instance " + app.hashCode()+
" init " + args.length);
int port=1200;
for (int i = 0; i < args.length; i++) {
System.err.println("SimpleApplication: arg " + i +
" = " + args[i]);
}
if (args.length > 0 && args[0].length() > 0)
port=Integer.parseInt(args[0]);
if (args.length > 1)
app.directory = args[1];
else
app.directory="/tmp";
/* Dump a message */
System.err.println("SimpleApplication: loading on port "+port);
Runtime.getRuntime().addShutdownHook(new ShutdownHook(app));
/* Set up this simple daemon */
app.server = new ServerSocket(port);
app.thread = new Thread(app);
app.start();
}
public void start()
{
/* Dump a message */
System.err.println("SimpleApplication: starting");
/* Start */
this.thread.start();
}
public void stop()
throws IOException, InterruptedException
{
/* Dump a message */
System.err.println("SimpleApplication: stopping");
/* Close the ServerSocket. This will make our thread to terminate */
this.stopping=true;
this.server.close();
/* Wait for the main thread to exit and dump a message */
this.thread.join(5000);
System.err.println("SimpleApplication: stopped");
}
public void destroy()
{
System.err.println("SimpleApplication: instance "+this.hashCode()+
" destroy");
}
public void run()
{
int number=0;
System.err.println("SimpleApplication: started acceptor loop");
try {
while(!this.stopping) {
Socket socket=this.server.accept();
Handler handler=new Handler(socket,this);
handler.setConnectionNumber(number++);
handler.setDirectoryName(this.directory);
new Thread(handler).start();
}
} catch (IOException e) {
/* Don't dump any error message if we are stopping. A IOException
is generated when the ServerSocket is closed in stop() */
if (!this.stopping) e.printStackTrace(System.err);
}
/* Terminate all handlers that at this point are still open */
Enumeration openhandlers=this.handlers.elements();
while (openhandlers.hasMoreElements()) {
Handler handler=(Handler)openhandlers.nextElement();
System.err.println("SimpleApplication: dropping connection "+
handler.getConnectionNumber());
handler.close();
}
System.err.println("SimpleApplication: exiting acceptor loop");
}
protected void addHandler(Handler handler) {
synchronized (handler) {
this.handlers.add(handler);
}
}
protected void removeHandler(Handler handler) {
synchronized (handler) {
this.handlers.remove(handler);
}
}
public static class ShutdownHook extends Thread
{
private final SimpleApplication instance;
public ShutdownHook(SimpleApplication instance)
{
this.instance = instance;
}
public void run()
{
System.out.println("Shutting down");
try {
instance.stop();
}
catch (Exception e) {
e.printStackTrace(System.err);
}
}
}
public static class Handler implements Runnable {
private final SimpleApplication parent;
private String directory=null; // Only set before thread is started
private final Socket socket;
private int number=0; // Only set before thread is started
public Handler(Socket s, SimpleApplication p) {
super();
this.socket=s;
this.parent=p;
}
public void run() {
this.parent.addHandler(this);
System.err.println("SimpleApplication: connection "+this.number+
" opened from "+this.socket.getInetAddress());
try {
InputStream in=this.socket.getInputStream();
OutputStream out=this.socket.getOutputStream();
handle(in,out);
this.socket.close();
} catch (IOException e) {
e.printStackTrace(System.err);
}
System.err.println("SimpleApplication: connection "+this.number+
" closed");
this.parent.removeHandler(this);
}
public void close() {
try {
this.socket.close();
} catch (IOException e) {
e.printStackTrace(System.err);
}
}
public void setConnectionNumber(int number) {
this.number=number;
}
public int getConnectionNumber() {
return(this.number);
}
public void setDirectoryName(String directory) {
this.directory=directory;
}
public String getDirectoryName() {
return(this.directory);
}
public void createFile(String name)
throws IOException {
OutputStream file=new FileOutputStream(name,true);
PrintStream out=new PrintStream(file);
SimpleDateFormat fmt=new SimpleDateFormat();
out.println(fmt.format(new Date()));
out.close();
file.close();
}
public void createDir(String name)
throws IOException {
File file = new File(name);
boolean ok = file.mkdirs();
if(! ok)
throw new IOException("mkdirs for "+name+" failed");
createFile(name);
}
public void handle(InputStream in, OutputStream os) {
PrintStream out=null;
// try {
// out=new PrintStream(os, true, "US-ASCII"); // Java 1.4+
// } catch (UnsupportedEncodingException ex) {
out=new PrintStream(os, true);
// }
while(true) {
try {
/* If we don't have data in the System InputStream, we want
to ask to the user for an option. */
if (in.available()==0) {
out.println();
out.println("Please select one of the following:");
out.println(" 1) Shutdown");
out.println(" 2) Create a file");
out.println(" 3) Disconnect");
out.println(" 4) Cause a core of the JVM");
out.println(" 5) Create a directory");
out.print("Your choice: ");
}
/* Read an option from the client */
int x=in.read();
switch (x) {
/* If the socket was closed, we simply return */
case -1:
return;
/* Attempt to shutdown */
case '1':
out.println("Attempting a shutdown...");
try {
System.exit(0);
} catch (IllegalStateException e) {
out.println();
out.println("Can't shutdown now");
e.printStackTrace(out);
}
break;
/* Create a file */
case '2':
String name=this.getDirectoryName()+
"/SimpleApplication."+
this.getConnectionNumber()+
".tmp";
try {
this.createFile(name);
out.println("File '"+name+"' created");
} catch (IOException e) {
e.printStackTrace(out);
}
break;
/* Disconnect */
case '3':
out.println("Disconnecting...");
return;
/* Crash JVM in a native call: It need an so file ;-) */
case '4':
System.load(System.getProperty("native.library", "./Native.so"));
toto();
break;
/* Create a directory (PR 30177 with 1.4.x and 1.5.0 */
case '5':
String name1=this.getDirectoryName()+
"/a/b/c/d/e"+
"/SimpleApplication."+
this.getConnectionNumber()+
".tmp";
try {
this.createDir(name1);
out.println("File '"+name1+"' created");
} catch (IOException e) {
e.printStackTrace(out);
}
break;
/* Discard any carriage return / newline characters */
case '\r':
case '\n':
break;
/* We got something that we weren't supposed to get */
default:
out.println("Unknown option '"+(char)x+"'");
break;
}
/* If we get an IOException we return (disconnect) */
} catch (IOException e) {
System.err.println("SimpleApplication: IOException in "+
"connection "+
this.getConnectionNumber());
return;
}
}
}
}
}