How to know if a socket connection is open ?

Hi,
I have a ftp class that opens a socket connection to a ftp server. Sometimes the connection is closed and I get an exception. There is any way to know if exists an open connection ?
Thanks !

From SDK v1.3.1 for abstract Class SocketImpl:
Method connect
protected abstract void connect(InetAddress address,
                                int port)
                         throws IOException
    Connects this socket to the specified port number on the specified host.
Parameters:
address - the IP address of the remote host.port - the port number.Throws:
IOException - if an I/O error occurs when attempting a connection.... So if it throws an exception on inception, it's NOT connected - NOT open, right? This is the class you've subclassed to create the socket connection? If not, which?

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i'm trying to make a socket connection send an email - i have code that works when you don't have to go through a proxy server but i can't make it pass the proxy server.
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import java.io.*;
import java.util.*;
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public String to_address = "[email protected]";
public String from_address = "[email protected]";
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i've tried that but it doesn't seem to do nething - this is how i implemented it...
import java.net.*;
import java.io.*;
import java.util.*;
public class Mail
public String to_address = "[email protected]";
public String from_address = "[email protected]";
public String sendSub = "HeHeHe";
public String sendBody = "hehehe - it worked";
// This is created to allow data to be read in by the keyboard.
BufferedReader in = new BufferedReader(
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String from_address, // sender's address
String sendSub, // subject
String sendBody) // Message
               throws IOException, ProtocolException,      UnknownHostException {
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     PrintStream out;               // stream to write to socket
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     socket = new Socket(host, 25); // opens socket to host on port 25 (SMTP port)
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// read the initial message
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System.getProperties().put( "proxySet", "true" );
          System.getProperties().put( "proxyHost", "144.124.16.28" );
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// Dialog with the mail server
// send HELO to SMTP server HELO command is given by a connecting SMTP host
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     out.flush() ;
     in.readLine();
// Once we are connected to the mail server we start sending the email...
// send "from"
     out.println( "MAIL FROM: " + from_address );
     out.flush() ;
     in.readLine();
// send "to"
     out.println( "RCPT TO: " + to_address );
     out.flush() ;
     in.readLine();
// prepare the mailserver to receive the data
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     out.flush() ;
     in.readLine();
// Send actual email
     out.println("From: " + from_address);
     out.println("To: " + to_address);
     out.println( "Subject: " + sendSub + "\n" );
     out.flush() ;
     out.println("");
     out.println( sendBody ) ;
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     out.flush() ;
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     out.flush();
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     socket.close() ;
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public static void main (String [] args) throws IOException
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How to know current speed of connection in Kbps?

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Try something like this:public class Test
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How to know Information of a Connection Pool

HI,
I want to know the information of a connection pool for example its maxSize and
what are the active connections in the pool programitically ie. thr' code.
I can monitor them thr' console.But how to monitor a pool thr' code.
And what does all the attributes like WaitSecondsHigh,Waiters,
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And how do i get the information of them thr' code.
I have seen that JDBCConnectionPoolRuntime gives information about the pool.But
how to create a object of this interface.
Can anyone provide me the code for this.
Let me explain more....
I have created a demo pool and has set the maximum connections size as 2.I tried
to get 3 connections from the pool and obvious a exception has raised.(java.sql.SQLException:
Pool connect failed: weblogic.common.ResourceException: None available).
so i am writing a class such that it keeps the connections in wait state when
the pool has reached its maximum value for which i should know what are the active
connections and the maximum size of the pool.
So please if any one can help me how to know these values of the connetion pool
programitically,it would be great.

Ventak:
This is a sample code i wrote some time ago.
import weblogic.management.MBeanHome;
import weblogic.management.WebLogicMBean;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.AuthenticationException;
import javax.naming.CommunicationException;
import weblogic.jndi.Environment;
import java.util.Collection;
import java.util.Iterator;
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import weblogic.management.configuration.JDBCConnectionPoolMBean;
import weblogic.management.WebLogicObjectName;
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public static void main(String args[])
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try
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Context ctx = env.getInitialContext();
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JDBCConnectionPoolRuntimeMBean poolR =
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These are extracts of the actual code, providing you diferent ways.
By the way, the issue you are trying to solve with a waiting time for a
connection to be available is an out-of-the-box functionality of the
weblogic pool. But is also restricted to some like 5 secs. (if i remember
well) and the reason is to avoid thread contention.
So if you are going to implement some like that must be much carefull. The
better way is to play with the InitialCapacity, MaxCapacity,
CapacityIncrement and ShrinkPeriod parameters, giving the enough connections
to avoid as possible as you can the situation in which exists waiters of
connections.
Hope this help.
"Venkat Raghava Moganti" <[email protected]> wrote in message
news:[email protected]...
>
HI,
I want to know the information of a connection pool for example itsmaxSize and
what are the active connections in the pool programitically ie. thr' code.
I can monitor them thr' console.But how to monitor a pool thr' code.>
And what does all the attributes like WaitSecondsHigh,Waiters,
WaitersHigh mean.how can i get information about them.
And how do i get the information of them thr' code.
I have seen that JDBCConnectionPoolRuntime gives information about thepool.But
how to create a object of this interface.
Can anyone provide me the code for this.
Let me explain more....
I have created a demo pool and has set the maximum connections size as 2.Itried
to get 3 connections from the pool and obvious a exception hasraised.(java.sql.SQLException:
Pool connect failed: weblogic.common.ResourceException: None available).
so i am writing a class such that it keeps the connections in wait statewhen
the pool has reached its maximum value for which i should know what arethe active
connections and the maximum size of the pool.
So please if any one can help me how to know these values of the connetionpool
programitically,it would be great.

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If you can post the minimum amount of code that reproduces the error, I will be more than happy to take a look at it.
Best regards,
Message Edited by Kalin T on 12-07-2006 03:11 PM
Kalin T.
National Instruments
Attachments:
activex_excel.jpg ‏16 KB

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How to know if a socket connection is open ?

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