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maddany
Class ChatServlet  

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          maddany.ChatServlet

All Implemented Interfaces:

Analyzer, java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig, Wakable

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public class ChatServlet

extends javax.servlet.http.HttpServlet

implements Analyzer, Wakable

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Field Summary
static int	IDENT_LENGTH
private  ChatListener	listener
private  java.util.Vector	pool
static int	PORT
private  java.util.Random	r
static int	TIMEOUT
private  java.lang.String	validChars

 

Fields inherited from class javax.servlet.http.HttpServlet

 

Fields inherited from class javax.servlet.GenericServlet

 

Constructor Summary

ChatServlet()

 

Method Summary
void	addToPool(java.lang.Object obj)
java.lang.String	analyze(java.lang.String toAnalyze, ChatHandler generator)
private  void	broadcast(java.lang.String tosend, ChatHandler generator)
boolean	containsIdentifier(java.lang.String ident)
void	doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)           Called by the server (via the service method) to allow a servlet to handle a GET request.
void	doPost(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)           Called by the server (via the service method) to allow a servlet to handle a POST request.
static java.lang.String	extractCommand(java.lang.String response)
static java.lang.String	extractParam(java.lang.String response)
ChatHandler	getHandlerByIdent(java.lang.String ident)
private  java.lang.String	getIdent(java.lang.String nick)
java.util.Vector	getThreadPool()
void	init(javax.servlet.ServletConfig conf)           Called by the servlet container to indicate to a servlet that the servlet is being placed into service.
private  void	internalBroadcast(java.lang.String tosend, ChatHandler generator)
private  boolean	isValidInput(java.lang.String str)
private  boolean	isValidNick(java.lang.String nick)
java.lang.String	logUserIn(java.lang.String nick, java.net.Socket sck)
private  void	logUserOut(java.lang.String ident)
java.util.Enumeration	poolElements()
void	removeFromPool(java.lang.Object obj)
private  java.lang.String	singleList()
void	wakeUp()
void	wakeUp(java.lang.Object obj)

 

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

 

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

validChars

private final java.lang.String validChars

See Also:

Constant Field Values

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IDENT_LENGTH

public static final int IDENT_LENGTH

See Also:

Constant Field Values

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TIMEOUT

public static final int TIMEOUT

See Also:

Constant Field Values

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PORT

public static final int PORT

See Also:

Constant Field Values

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pool

private java.util.Vector pool

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r

private java.util.Random r

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listener

private ChatListener listener

Constructor Detail

ChatServlet

public ChatServlet()

Method Detail

init

public void init(javax.servlet.ServletConfig conf)
          throws javax.servlet.ServletException

Description copied from class: javax.servlet.GenericServlet

Called by the servlet container to indicate to a servlet that the servlet is being placed into service. See Servlet.init(javax.servlet.ServletConfig)>Servlet.init(javax.servlet.ServletConfig) 55 .

This implementation stores the javax.servlet.ServletConfig object it receives from the servlet container for later use. When overriding this form of the method, call super.init(config).

Specified by:

init in interface javax.servlet.Servlet

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doGet

public void doGet(javax.servlet.http.HttpServletRequest req,
                  javax.servlet.http.HttpServletResponse res)
           throws javax.servlet.ServletException,
                  java.io.IOException

Description copied from class: javax.servlet.http.HttpServlet

Called by the server (via the service method) to allow a servlet to handle a GET request.

Overriding this method to support a GET request also automatically supports an HTTP HEAD request. A HEAD request is a GET request that returns no body in the response, only the request header fields.

When overriding this method, read the request data, write the response headers, get the response's writer or output stream object, and finally, write the response data. It's best to include content type and encoding. When using a PrintWriter object to return the response, set the content type before accessing the PrintWriter object.

The servlet container must write the headers before committing the response, because in HTTP the headers must be sent before the response body.

Where possible, set the Content-Length header (with the ServletResponse.setContentLength(int)>ServletResponse.setContentLength(int) 55 method), to allow the servlet container to use a persistent connection to return its response to the client, improving performance. The content length is automatically set if the entire response fits inside the response buffer.

When using HTTP 1.1 chunked encoding (which means that the response has a Transfer-Encoding header), do not set the Content-Length header.

The GET method should be safe, that is, without any side effects for which users are held responsible. For example, most form queries have no side effects. If a client request is intended to change stored data, the request should use some other HTTP method.

The GET method should also be idempotent, meaning that it can be safely repeated. Sometimes making a method safe also makes it idempotent. For example, repeating queries is both safe and idempotent, but buying a product online or modifying data is neither safe nor idempotent.

If the request is incorrectly formatted, doGet returns an HTTP "Bad Request" message.

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doPost

public void doPost(javax.servlet.http.HttpServletRequest req,
                   javax.servlet.http.HttpServletResponse res)
            throws javax.servlet.ServletException,
                   java.io.IOException

Description copied from class: javax.servlet.http.HttpServlet

Called by the server (via the service method) to allow a servlet to handle a POST request. The HTTP POST method allows the client to send data of unlimited length to the Web server a single time and is useful when posting information such as credit card numbers.

When overriding this method, read the request data, write the response headers, get the response's writer or output stream object, and finally, write the response data. It's best to include content type and encoding. When using a PrintWriter object to return the response, set the content type before accessing the PrintWriter object.

The servlet container must write the headers before committing the response, because in HTTP the headers must be sent before the response body.

Where possible, set the Content-Length header (with the ServletResponse.setContentLength(int)>ServletResponse.setContentLength(int) 55 method), to allow the servlet container to use a persistent connection to return its response to the client, improving performance. The content length is automatically set if the entire response fits inside the response buffer.

When using HTTP 1.1 chunked encoding (which means that the response has a Transfer-Encoding header), do not set the Content-Length header.

This method does not need to be either safe or idempotent. Operations requested through POST can have side effects for which the user can be held accountable, for example, updating stored data or buying items online.

If the HTTP POST request is incorrectly formatted, doPost returns an HTTP "Bad Request" message.

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analyze

public java.lang.String analyze(java.lang.String toAnalyze,
                                ChatHandler generator)

Specified by:

analyze in interface Analyzer

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broadcast

private void broadcast(java.lang.String tosend,
                       ChatHandler generator)

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internalBroadcast

private void internalBroadcast(java.lang.String tosend,
                               ChatHandler generator)

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getThreadPool

public java.util.Vector getThreadPool()

Specified by:

getThreadPool in interface Analyzer

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addToPool

public void addToPool(java.lang.Object obj)

Specified by:

addToPool in interface Analyzer

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removeFromPool

public void removeFromPool(java.lang.Object obj)

Specified by:

removeFromPool in interface Analyzer

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poolElements

public java.util.Enumeration poolElements()

Specified by:

poolElements in interface Analyzer

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wakeUp

public void wakeUp()

Specified by:

wakeUp in interface Wakable

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wakeUp

public void wakeUp(java.lang.Object obj)

Specified by:

wakeUp in interface Wakable

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logUserIn

public java.lang.String logUserIn(java.lang.String nick,
                                  java.net.Socket sck)

Specified by:

logUserIn in interface Analyzer

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logUserOut

private void logUserOut(java.lang.String ident)

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containsIdentifier

public boolean containsIdentifier(java.lang.String ident)

Specified by:

containsIdentifier in interface Analyzer

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getHandlerByIdent

public ChatHandler getHandlerByIdent(java.lang.String ident)

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getIdent

private java.lang.String getIdent(java.lang.String nick)

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singleList

private java.lang.String singleList()

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isValidInput

private boolean isValidInput(java.lang.String str)

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isValidNick

private boolean isValidNick(java.lang.String nick)

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extractCommand

public static java.lang.String extractCommand(java.lang.String response)

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extractParam

public static java.lang.String extractParam(java.lang.String response)

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> [ maddany overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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