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To avoid being vague about how a suggested optimization may improve application performance, most of the examples presented here will be timed before and after a speci c optimization This section describes the procedure used to time the performance of most of the code snippets in the following sections It also provides some insight into issues that should be considered to accurately pro le portions of your application The uptimeMillis method, de ned in the comdalsemisystemTINIOS class, can be used for timing operations that execute over a period of a few milliseconds to several minutes with reasonable accuracy

validates :name,

public static native final long uptimeMillis()

1997-05-17T17:00:00,0

:presence => true, :length => { :maximum => 50 }

11

For the password length validation, instead we ve used the :within option, passing it the range1 640 to enforce the desired length constraints

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At this point, you may be concerned that we re not storing user passwords anywhere; since we ve elected to use a virtual password, rather than storing it in the database, it exists only in memory How can we use this password for authentication The solution is to create a separate attribute dedicated to password storage, and our strategy will be to use the virtual password as raw material for an encrypted password, which we will store in the database upon user signup ( 8) and retrieve later for use in user authentication ( 9) Let s plan to store the encrypted password using an encrypted_password attribute in our User model We ll discuss the implementation details in Section 72, but we can get started with our encrypted password tests by noting that the encrypted password should at the least exist We can test this using the Ruby method respond_to , which accepts a symbol and returns true if the object responds to the given method or attribute and false otherwise:

This method returns a long integer representing the number of milliseconds that have elapsed since the system was booted It is maintained by the high-priority timer interrupt that drives system operations such as task scheduling It is not tied to the real-time clock in any way, but it drifts only about 1 millisecond every second The currentTimeMillis method, de ned in javalangSystem, returns a long integer that represents the number of milliseconds that have elapsed since midnight, January 1, 1970 UTC Its value is derived from reading the real-time clock and over long periods of time is very accurate However, the smallest time interval granularity supported by TINI s real-time clock is 10 milliseconds, making it dif cult to use currentTimeMillis to measure small intervals of time Also, a lot of expensive arithmetic must be performed to compute the speci ed return value In fact, it takes nearly 20 milliseconds per invocation of currentTimeMillis on a TINI Board model 390 Either method can be used for our purposes, but the execution times reported in this chapter are measured using uptimeMillis because of its relatively low overhead compared with currentTimeMillis To keep the overhead of pro ling code to a dull roar, the timing measurements are taken in-line by capturing the OS tick count just before and just after the operation being timed Additional method invocations are avoided A sample code snippet is shown in Listing 111 With a granularity of approximately 1 millisecond returned by uptimeMillis, we should expect timing errors roughly within a +/ 2-millisecond range for two invocations of uptimeMillis Listing 111 Measuring elapsed time

$ rails console --sandbox >> user = Usernew >> userrespond_to (:password) => true >> userrespond_to (:encrypted_password) => false

To access the complete ISO standard in PDF form (you will be amazed at how much can be written on the topic of "What time is it "), check http://wwwisoch/markete/8601pdf To complicate things a bit more, whenever you give something a timestamp, you have to consider the issue of time zones This issue is especially important for systems that operate over the Internet because your XML instances frequently will cross time zones One approach, which I favor, is to represent all timestamps in GMT (Greenwich mean time) Make sure that every time you represent a timestamp, you're translating it to the current time zone (You also have to make allowances for daylight savings time, which requires care because daylight savings time changes at different times depending on where on earth you are) All other time zones are annotated in relation to GMT (for example, US eastern standard time is GMT-5) so representing timestamps in GMT is quite natural and not at all a throwback to a bygone era of the British empire

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