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We hear the word discipline a lot when people talk about trading philosophies and trading psychology Most of us heard the word a lot in our formative years too The concept is the same Discipline when you were younger might have meant getting up early to do your morning paper route, making sure to do your chores before breakfast, or being on time for school Many people learned a higher level of discipline in the military or when they had children of their own to worry about and supervise For some people discipline may mean limiting oneself to a couple of beers at the ball game or to two martinis while out with the girls Discipline in trading is very similar It means not throwing good money after bad and not succumbing to the rush of making fast money This is particularly important after a trader has had a pro table streak You will nd that once you ve had a pro table trade or a string of pro table trades, you miss not being in the market You also may start to think that because you have this cushion of pro t, it s easier to take risks When you recognize this behavior, it should set off alarm bells Disciplined traders wait patiently for their setups and treat

This relieves the servlet engine from having to create and maintain a session when it isn t needed The memory requirements for unnecessary sessions can be significant When the session is first created, the client (Web browser) doesn t yet know about it When the session ID has been sent to the client and the client sends it back in the next request, the client is said to join the session A servlet or JSP page can detect whether this has happened with the isNew() method:

Dim people As New PeopleDataContext() Console.WriteLine("Person count = {0}", people.UspCountPerson())

HttpSession session = requestgetSession(); if (sessionisNew()) { // Create an empty shopping cart }

sessionisNew() is true if the session is newly created and the client hasn t yet been informed or if the client has been informed, but chooses not to participate

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The servlet engine tries to use cookies to keep track of the session ID In the HTTP response written by a servlet that created a session, a Set-Cookie header containing the session ID is in a cookie named JSESSIONID3

If the client accepts the cookie, the client returns it in subsequent requests:

If this happens, the client request can be associated with the session with no special considerations on the part of the servlet If the client doesn t accept cookies, however, the session is lost To prevent this, the servlet API has a fallback mechanism It uses URL rewriting if cookies fail This is slightly more complicated for the programmer because it means all URLs written by the servlet must have the session ID appended

3 This is prescribed by the Servlet 22 API specification Some servlet engines use a different value

But, because this is unnecessary and expensive if the client accepts cookies, the URL rewriting should only be done if you definitely know the cookie method fails Fortunately, the servlet API has methods that encapsulate all this logic The HttpServletResponse class has encodeURL() and encodeRedirectURL() methods that add the session ID to a URL only if necessary:

String myURL = responseencodeURL( /servlet/nextServlet ); outprintln("Click <A HREF='" + myURL + "'>here</A>" + " to continue");

encodeRedirectURL() should be used with URLs passed to the responsesendRedirect() method and encodeURL() with all others When the encodeURL() method is used, the session ID is always embedded in the URL when sessionisNew() is true After the first response from the client, the servlet engine determines whether the session ID was returned in a cookie If not, the servlet engine continues to append the ID to URLs passed through encodeURL() Otherwise, it switches to using cookies only and encodeURL() returns unmodified URL strings This makes testing all the possibilities unnecessary for the programmer

Objects are bound to a session with the setAttribute() method:

sessionsetAttribute("jspcrsessionsmyappuser", userID);

The name under which an object is bound can be any unique string Because sessions are shared between all servlets and JSP pages in the current HTTP session, however, it makes sense to use a name that won t conflict with other applications Most common is to choose names with a prefix that s the package name or fully qualified class name of the servlet or JSP page Any kind of object can be stored in a session, but because sessions may be serialized, a good idea is to have session objects implement javaioSerializable Note, too, only objects can be stored, not primitives like int, char or double To store these primitives, you must use their object wrappers Integer, Character, or Double Objects can be retrieved from a session with the getAttribute() method:

String userID = (String) sessiongetAttribute( "jspcrsessionsmyappuser");

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