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Can someone summarise visibility choices for Java interfaces?

Can someone summarise visibility choices for Java interfaces?

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I have two questions really:

1) When would you use a package-private interface?

2) Is there a way to have a public interface which is closed for implementation outside its package?

java oop api-design

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asked May 17 ’09 at 20:53

GeorgiGeorgi

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1) when the interface is only needed in the scope of your package. For example an interface could make your code more readable, but the callers of the package have no need for it.

2) No, this isn’t possible. See this link for more info. An interface defines no implementation. How could you close it for implementation then?

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answered May 17 ’09 at 21:00

kgiannakakiskgiannakakis

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Package private interfaces are only useful in cases such implementations of the strategy pattern, where by there are several implementations that you may wish to use but dont want the world to be aware of the types.

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answered May 17 ’09 at 21:26

mP.mP.

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1) You may have utility methods used by multiple classes in your package which should never be called externally. Or they may be only needed by one class, but that class is so large you want to move some methods to another class for maintainability.

2) I would have to try it out (sorry, I’m rushing out the door now), but you might be able to effectively do that by declaring a protected default constructor in the interface.

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answered May 17 ’09 at 21:25

dj_segfaultdj_segfault

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You can’t declare constructors in an interface, note. Above note is right, if it’s public, it can be implemented anywhere.

– Sean Owen
May 17 ’09 at 22:56

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AuthenticateRequest event

AuthenticateRequest event

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Q 1. To my understanding FormsAuthenticationModule is subscribed to AuthenticateRequest event, and thus only after this event is fired, is FormsAuthenticationModule called. But the following quotes got me a bit confused:

The AuthenticateRequest event signals that the configured authentication mechanism has authenticated the current request.

Doesn’t the above quote suggest that when AuthenticateRequest event is raised, request (aka user) is already authenticated?

Subscribing to the AuthenticateRequest event ensures that the request will be authenticated before processing the attached module or event handler.

As far as I understand this quote, if we subscribe to AuthenticatedRequest, then our event handler will be called prior to FormsAuthenticationModule? Thus Application_AuthenticateRequest() will be called before FormsAuthenticationModule is called?

Q 2. Book I’m learning from suggests that within Application_AuthenticateRequest() we are able to verify whether user is a member of specific role, and if not, we can add the user automatically:

protected void Application_AuthenticateRequest(Object sender, EventArgs e)
{
if (User.Identity.IsAuthenticated && Roles.Enabled)
{

//here we can subscribe user to a role via Roles.AddUserToRole()
}
}

Judging from the above code, Application_AuthenticateRequest() is called after FormsAuthenticationModule has been invoked, but somewhere else same book implies that Application_AuthenticateRequest() is called prior to FormsAuthenticationModule:

Application_AuthenticateRequest is called just before authentication is performed.
This is a jumping-off point for creating your own authentication logic.

What am I missing?

Thanx

c# asp.net authentication forms-authentication httpapplication

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edited Jul 10 ’12 at 10:59

escist

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asked May 17 ’09 at 20:53

SourceCSourceC

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It seems that the FormsAuthenticationModule gets handled first. This module is normally earlier than any custom module in the ASP.NET pipeline, so when AuthenticateRequest is fired, FormsAuthenticationModule will get called first, do its job and then your module’s event handler will be called.

If you really want to dig deep into this, I suggest trying to debug the ASP.NET code yourself. Here is a post how to set up your VS:

http://weblogs.asp.net/scottgu/archive/2008/01/16/net-framework-library-source-code-now-available.aspx

EDIT: I was able to confirm this behavior by setting up a web project with custom module and event handlers in Global.asax. Take a look at the source code of HttpApplication.InitInternal, the order of initialization is as follows:

initialization of integrated modules: FormsAuthenticationModule hooks up to HttpApplication.AuthenticateRequest event
initialization of custom modules: custom module hooks up to HttpApplication.AuthenticateRequest event
initialization of Global class (global.asax): here we hook up to the AuthenticateRequest event
HttpApplication.InitInternal searches for methods on Global class following the specific name pattern (e.g. Application_AuthenticateRequest), matches them to event and hooks up

After the initialization, when the AuthenticateRequest fires, the event handlers are called in the order they where initialized, so:

FormsAuthenticationModule.AuthenticateRequest event handler
CustomModule.AuthenticateRequest event handler
Global.AuthenticateRequest event handler
Global.Application_AuthenticateRequest method

Unless I missed something, there is no mechanism for stopping the event handlers to fire, so no matter what the result of FormsAuthenticationModule.AuthenticateRequest, the next handlers will still be called. I hope that helps.

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edited May 17 ’09 at 23:07

answered May 17 ’09 at 21:40

bbmudbbmud

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Q1 If I understand you correctly, then when AuthenticateRequest fires, FormsAuthenticationModule is called first, then Application_AuthenticateRequest() and only then are custom authentication modules called? Q2 – But what about that MSDN quote (“The AuthenticateRequest event signals that the configured authentication mechanism has authenticated the current request”), which implies that AuthenticateRequest is fired only after FormsAuthenticationModule does its job?

– SourceC
May 17 ’09 at 22:10

1

Detailed answer in the post. Regarding Q2 – I guess it is not entirely true: “The AuthenticateRequest event signals that the configured authentication mechanism has authenticated the current request” – it certainly went through the event handler on FormsAuthenticationModule, but we do not know the result 😉

– bbmud
May 17 ’09 at 23:10

1

thanx. You’ve really helped me out with this

– SourceC
May 18 ’09 at 0:09

1

One little note: the FormsAuthenticationModule.Authenticate event (not called AuthenticateRequest) is called [during the Application.AuthenticateRequest event](FormsAuthenticationModule). You can register to that event just as you can to any other, using the predefined names in global.asax.

– Abel
Aug 26 ’10 at 0:38

Thank you so much for this post. I expected the HttpApplication class to have an interface where it explicitly defined the Application_AuthenticateRequest() method.

– dionysus
Oct 28 ’16 at 13:56

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If you want access to the User object, I’d suggest you use

protected void Application_Start()
{
PostAuthenticateRequest += Application_PostAuthenticateRequest;
}

protected void Application_PostAuthenticateRequest(object sender, EventArgs e)
{
if(User.Identity.IsAuthenticated)
{
//Do stuff here
}
}

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answered Feb 20 ’12 at 12:03

ShelakelShelakel

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editing a wav files using python

editing a wav files using python

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Between each word in the wav file I have full silence (I checked with Hex workshop and silence is represented with 0’s).

How can I cut the non-silence sound?

I’m programming using python.

Thanks!

python audio

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edited Aug 12 ’17 at 1:19

Joshua Dawson

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asked May 17 ’09 at 20:54

John TerryJohn Terry

You should consider clarifying your question a little bit. I want to know if you’re trying to remove the silence, or actually split your audio into separate chunks?

– Soviut
May 18 ’09 at 3:26

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Python has a wav module. You can use it to open a wav file for reading and use the `getframes(1)’ command to walk through the file frame by frame.

import wave
w = wave.open(‘beeps.wav’, ‘r’)
for i in range():
frame = w.readframes(1)

The frame returned will be a byte string with hex values in it. If the file is stereo the result will look something like this (4 bytes):

‘xe2xffxe2xff’

If its mono, it will have half the data (2 bytes):

‘xe2xff’

Each channel is 2 bytes long because the audio is 16 bit. If is 8 bit, each channel will only be one byte. You can use the getsampwidth() method to determine this. Also, getchannels() will determine if its mono or stereo.

You can loop over these bytes to see if they all equal zero, meaning both channels are silent. In the following example I use the ord() function to convert the ‘xe2’ hex values to integers.

import wave
w = wave.open(‘beeps.wav’, ‘r’)
for i in range(w.getnframes()):
### read 1 frame and the position will updated ###
frame = w.readframes(1)

all_zero = True
for j in range(len(frame)):
# check if amplitude is greater than 0
if ord(frame[j]) > 0:
all_zero = False
break

if all_zero:
# perform your cut here
print ‘silence found at frame %s’ % w.tell()
print ‘silence found at second %s’ % (w.tell()/w..getframerate())

It is worth noting that a single frame of silence doesn’t necessarily denote empty space since the amplitude may cross the 0 mark normal frequencies. Therefore, it is recommended that a certain number of frames at 0 be observed before deciding if the region is, in fact, silent.

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edited Jan 28 ’14 at 10:24

Jeff

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answered May 17 ’09 at 23:50

SoviutSoviut

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1

bytes can occur in the pure sine wave when crossing 0! Imagine a 44100Hz sampled file on a 11025Hz sine wave to see what I mean. I don’t -1, as the rest of the answer is very good.

– Paweł Polewicz
May 19 ’09 at 8:51

1

readframes(i) returns i frames in sequence, not 1 frame at position i. So your loop will return 1 frame, then 2 frames, then 3 frames, etc. it should be readframes(1) not readframes(i).

– gravitron
Dec 2 ’11 at 17:24

1

Fixed, though I’m taking your word on this.

– Soviut
Dec 3 ’11 at 5:25

Remember that 8-bit wavs are unsigned while 16-bit wavs are signed. Not sure how python’s wave handles this. I’d rather use a higher-level library like audiolab.

– endolith
Mar 21 ’12 at 16:00

@Soviut What is ord(frame[j]) ? Is it the amplitude of the wave?

– Jaseem
Oct 28 ’12 at 21:36

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I have been doing some research on this topic for a project I’m working on and I came across a few problems with the solution provided, namely the method for determining silence is incorrect. A “more correct” implementation would be:

import struct
import wave

wave_file = wave.open(“sound_file.wav”, “r”)

for i in range(wave_file.getnframes()):
# read a single frame and advance to next frame
current_frame = wave_file.readframes(1)

# check for silence
silent = True
# wave frame samples are stored in little endian**
# this example works for a single channel 16-bit per sample encoding
unpacked_signed_value = struct.unpack(“<h”, current_frame) # *
if abs(unpacked_signed_value[0]) > 500:
silent = False

if silent:
print “Frame %s is silent.” % wave_file.tell()
else
print “Frame %s is not silent.” % wave_file.tell()

References and Useful Links

*Struct Unpacking will be useful here: https://docs.python.org/2/library/struct.html

**A good reference I found explaining the format of wave files for dealing with different size bit-encodings and multiple channels is: http://www.piclist.com/techref/io/serial/midi/wave.html

Using the built-in ord() function in Python on the first element of the string object returned by the readframes(x) method will not work correctly.

Another key point is that multiple channel audio is interleaved and thus a little extra logic is needed for dealing with channels. Again, the link above goes into detail about this.

Hopefully this helps someone in the future.

Here are some of the more important points from the link, and what I found helpful.

Data Organization

All data is stored in 8-bit bytes, arranged in Intel 80×86 (ie, little endian) format. The bytes of multiple-byte values are stored with the low-order (ie, least significant) bytes first. Data bits are as follows (ie, shown with bit numbers on top):

7 6 5 4 3 2 1 0
+———————–+
char: | lsb msb |
+———————–+

7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8
+———————–+———————–+
short: | lsb byte 0 | byte 1 msb |
+———————–+———————–+

7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 23 22 21 20 19 18 17 16 31 30 29 28 27 26 25 24
+———————–+———————–+———————–+———————–+
long: | lsb byte 0 | byte 1 | byte 2 | byte 3 msb |
+———————–+———————–+———————–+———————–+

Interleaving

For multichannel sounds (for example, a stereo waveform), single sample points from each channel are interleaved. For example, assume a stereo (ie, 2 channel) waveform. Instead of storing all of the sample points for the left channel first, and then storing all of the sample points for the right channel next, you “mix” the two channels’ sample points together. You would store the first sample point of the left channel. Next, you would store the first sample point of the right channel. Next, you would store the second sample point of the left channel. Next, you would store the second sample point of the right channel, and so on, alternating between storing the next sample point of each channel. This is what is meant by interleaved data; you store the next sample point of each of the channels in turn, so that the sample points that are meant to be “played” (ie, sent to a DAC) simultaneously are stored contiguously.

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edited Aug 5 ’14 at 4:54

answered Aug 5 ’14 at 2:05

ffhaddadffhaddad

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2

See also How to edit raw PCM audio data without an audio library?

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edited May 23 ’17 at 12:25

Community♦

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tzottzot

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I have no experience with this, but have a look at the wave module present in the standard library. That may do what you want. Otherwise you’ll have to read the file as a byte stream an cut out sequences of 0-bytes (but you cannot just cut out all 0-bytes, as that would invalidate the file…)

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answered May 17 ’09 at 21:00

Stephan202Stephan202

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You might want to try using sox, a command-line sound processing tool. It has many modes, one of them is silence:

silence: Removes silence from the beginning, middle, or end of a sound file. Silence is anything below a specified threshold.

It supports multiple sound formats and it’s quite fast, so parsing large files shouldn’t be a problem.

To remove silence from the middle of a file, specify a below_periods that is negative. This value is then treated as a positive value and is also used to indicate the effect should restart processing as specified by the above_periods, making it suitable for removing periods of silence in the middle of the sound file.

I haven’t found any python building for libsox, though, but You can use it as You use all command line programs in python (or You can rewrite it – use sox sources for guidance then).

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answered May 17 ’09 at 21:46

Paweł PolewiczPaweł Polewicz

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1

You will need to come up with some threshold value of a minimum number of consecutive zeros before you cut them. Otherwise you’ll be removing perfectly valid zeros from the middle of normal audio data. You can iterate through the wave file, copying any non-zero values, and buffering up zero values. When you’re buffering zeroes and eventually come across the next non-zero, if the buffer has fewer samples that the threshold, copy them over, otherwise discard it.

Python is not a great tool for this sort of task though. 🙁

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answered May 18 ’09 at 12:44

KylotanKylotan

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Detect & Record Audio in Python

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Greasemonkey script for inserting math in gmail

Greasemonkey script for inserting math in gmail

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I wish an easy way to communicate mathematical equations with gmail.

There’s a javascript script called AsciiMath, which should translate Tex-like equations into standard mathML.

I thought that it would be nice to use this script with GM. I thought that before sending the email, this script would convert all the TeX-like equations in your email to MathML. Thus the reader which is using FF (or IE with MathPlayer installed) would be able to easily read those equations.

Ideally, I wish to somehow keep the original TeX-like equations in a plain-text message, so that it would be readable by plain text email clients, such as mutt.

Obviously the weakest link here is the client software, which most likely doesn’t support MathML. Still if my correspondent is using Firefox and some kind of webmail (which is pretty reasonable) – it should work.

My question is, is it possible? Did anyone do that?

Do you see any technical problems with this approach (gmail filtering the MathML, client not parsing it correctly etc.)?

Any smarter ideas?

javascript email latex gmail mathml

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asked May 17 ’09 at 20:54

Elazar LeibovichElazar Leibovich

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GmailTeX does exactly what you want. It is pure javascript so it works in Firefox, Chrome, Opera.

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answered Jun 14 ’10 at 1:52

saturnsaturn

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1

Awesome! That guy taught my Calc 2 class.

– krousey
Sep 9 ’10 at 14:22

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2

What about using texify and converting it just to a html image or a link to that image? This would save some work with parsing and converting the tex math code and wold work fine even with simple mail clients.

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answered May 17 ’09 at 21:17

cubecube

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Most clients would, by default, block images linked with other websites. And it would make all your correspondence depend on textify. This is possible, if I’ll find out most email clients show the alt-text instead of the image by default. Thanks.

– Elazar Leibovich
May 18 ’09 at 7:06

1

texify.com no longer allows direct hot-linking of images; I use code.google.com/apis/chart/docs/gallery/formulas.html now.

– ephemient
Feb 20 ’10 at 21:41

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0

Depending on whom you communicate with the easiest solution is sometimes to email raw tex.

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answered May 18 ’09 at 15:00

secondsecond

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As far as I can figure out, GmailTeX (suggested in the top answer) does not work in Firefox anymore.

I can suggest the browser plugin MathQuill for Gmail (also exists for Chrome), which allows to edit formulas within the Gmail compose window, and converts them into pictures. (Like GmailTeX in concept, but with an interactive editor.)

Disclaimer: I am the author of the plugin.

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edited Nov 27 ’17 at 9:57

answered Nov 23 ’17 at 9:39

Dominique UnruhDominique Unruh

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What is the difference between a .cpp file and a .h file?

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Because I’ve made .cpp files then transfered them into .h files, the only difference I can find is that you can’t #include .cpp files. Is there any difference that I am missing?

c++ header include

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edited May 18 ’09 at 16:56

Kent Fredric

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asked May 17 ’09 at 20:54

user98188user98188

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To understand people’s answers below, you might need to ask another question: i.e. “What’s the difference between a ‘declaration’ and a ‘definition’ in C++?”

– ChrisW
May 17 ’09 at 21:00

1

I know the difference between a declaration and a definition.

– user98188
May 17 ’09 at 21:23

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You can include anything you want, but linking stage will break if you include global variables into more than one compilation units. That’s why there is a convention to not link .cpp files.

– John Smith
May 17 ’09 at 22:16

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The C++ build system (compiler) knows no difference, so it’s all one of conventions.

The convention is that .h files are declarations, and .cpp files are definitions.

That’s why .h files are #included — we include the declarations.

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answered May 17 ’09 at 20:57

MackerMacker

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The C++ build system does differentiate – try running g++ on a .h file and a .cpp file and see what happens, for example.

– anon
May 17 ’09 at 21:09

I know that .cpp files are used (most of the time) to define functions/classes/etc that have been declared in .h files, but you can define variables in .h files too.

– user98188
May 17 ’09 at 21:25

5

@Neil Butterworth: Yes the G++ compiler understands the convention, but you can make it compile by forcing the language.

– Martin York
May 18 ’09 at 15:03

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24

The .cpp file is the compilation unit : it’s the real source code file that will be compiled (in C++).

The .h (header) files are files that will be virtually copy/pasted in the .cpp files where the #include precompiler instruction appears. Once the headers code is inserted in the .cpp code, the compilation of the .cpp can start.

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answered May 17 ’09 at 20:59

KlaimKlaim

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Why do you say THE .cpp file and not A .cpp file?

– user98188
May 17 ’09 at 21:26

12

@Keand64: Because the compiler looks at only one .cpp file at a time when compiling things. It reads a .cpp file, reads all the #included .h files, compiles the whole thing, writes a .o (or .obj) file, and then proceeds to the next .cpp file.

– Greg Hewgill
May 17 ’09 at 21:50

Does this mean that .cpp and .h must have the same name?

– fathergorry
20 hours ago

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I know the difference between a declaration and a definition.

Whereas:

A CPP file includes the definitions from any header which it includes (because CPP and header file together become a single ‘translation unit’)
A header file might be included by more than one CPP file
The linker typically won’t like anything defined in more than one CPP file

Therefore any definitions in a header file should be inline or static. Header files also contain declarations which are used by more than one CPP file.

Definitions that are neither static nor inline are placed in CPP files. Also, any declarations that are only needed within one CPP file are often placed within that CPP file itself, nstead of in any (sharable) header file.

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answered May 17 ’09 at 21:37

ChrisWChrisW

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A header (.h, .hpp, …) file contains

Class definitions ( class X { … }; )
Inline function definitions ( inline int get_cpus() { … } )
Function declarations ( void help(); )
Object declarations ( extern int debug_enabled; )

A source file (.c, .cpp, .cxx) contains

Function definitions ( void help() { … } or void X::f() { … } )
Object definitions ( int debug_enabled = 1; )

However, the convention that headers are named with a .h suffix and source files are named with a .cpp suffix is not really required. One can always tell a good compiler how to treat some file, irrespective of its file-name suffix ( -x <file-type> for gcc. Like -x c++ ).

Source files will contain definitions that must be present only once in the whole program. So if you include a source file somewhere and then link the result of compilation of that file and then the one of the source file itself together, then of course you will get linker errors, because you have those definitions now appear twice: Once in the included source file, and then in the file that included it. That’s why you had problems with including the .cpp file.

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answered May 17 ’09 at 21:32

Johannes Schaub – litbJohannes Schaub – litb

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.h files, or header files, are used to list the publicly accessible instance variables and and methods in the class declaration. .cpp files, or implementation files, are used to actually implement those methods and use those instance variables.

The reason they are separate is because .h files aren’t compiled into binary code while .cpp files are. Take a library, for example. Say you are the author and you don’t want it to be open source. So you distribute the compiled binary library and the header files to your customers. That allows them to easily see all the information about your library’s classes they can use without being able to see how you implemented those methods. They are more for the people using your code rather than the compiler. As was said before: it’s the convention.

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answered May 17 ’09 at 21:00

Marc WMarc W

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Others have already offered good explanations, but I thought I should clarify the differences between the various extensions:

Source Files for C: .c
Header Files for C: .h

Source Files for C++: .cpp
Header Files for C++: .hpp

Of course, as it has already been pointed out, these are just conventions. The compiler doesn’t actually pay any attention to them – it’s purely for the benefit of the coder.

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answered May 17 ’09 at 21:04

NoldorinNoldorin

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Most people actually use .h for C++ too.

– Zifre
May 17 ’09 at 21:35

@Zifre: Yes, hence my saying that these are recommended naming conventions, even though many may not follow them.

– Noldorin
May 17 ’09 at 22:05

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A good rule of thumb is “.h files should have declarations [potentially] used by multiple source files, but no code that gets run.”

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answered May 17 ’09 at 21:13

dj_segfaultdj_segfault

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By convention, .h files are included by other files, and never compiled directly by themselves. .cpp files are – again, by convention – the roots of the compilation process; they include .h files directly or indirectly, but generally not .cpp files.

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answered May 17 ’09 at 20:57

bdonlanbdonlan

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Naming convention for Django views?

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I’m building a website (in Django) and am confused about the right naming convention to use for my functions. Trivial example: let’s say I have a page that lets the user decide whether they want to see image A or image B. Once the user submits the decision, the site displays the image the user requested.

Here are the two functions I would have in my views module:

def function1(request):
“””Returns the page that presents the user with the choice between A and B”””

def function2(request):
“””Takes in the submitted form and returns a page with the image the user requested.”””

What is the convention for naming the functions that do this? I see at least two feasible ways:

Option 1: function1: “decide”, function2: “view_image”

Option 2: function1: “view_choices”, function2: “decide”

The central issue is that each of these functions does 2 things: (1) process and store the data the user submitted, and (2) return the next page, which may or may not be related to the user’s input. So should I name my functions after (1) or (2)?

django naming-conventions

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edited May 17 ’09 at 21:31

Soviut

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asked May 17 ’09 at 20:55

RexERexE

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Typically the convention is some kind of CRUD (create, retrieve, update, delete). I personally use index, detail, create, update, delete for my actions. However, I don’t think this applies to your custom functions.

Really it sounds like your functions should be merged into the same “choose” function. You then either display the form or the result depending on whether the result was a POST or not.

Note: I’ve heavily coppied this example form the django docs on form handling.

def choose(request):
“””
Presents the user with an image selection form and displays the result.
“””
if request.method == ‘POST’: # If the form has been submitted…
form = ChoiceForm(request.POST) # A form bound to the POST data
if form.is_valid(): # All validation rules pass
# Process the data in form.cleaned_data
# …
return HttpResponseRedirect(‘/thanks/’) # Redirect after POST
else:
form = ChoiceForm() # An unbound form

return render_to_response(‘choose.html’, {
‘form’: form,
})

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edited May 17 ’09 at 22:35

answered May 17 ’09 at 21:29

SoviutSoviut

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Thanks Soviut! This might be just what I’m looking for. But I’m wondering — would this “choose” function also contain the code to return the page with the picture, or would that code belong in another function? (I wouldn’t be redirecting to ‘/thanks/’ in my case.)

– RexE
May 18 ’09 at 2:05

2

@RexE: If the form is POSTed (which it should be if it modifies data), then you should redirect after processing the data to a different view that displays the page. Otherwise you expose the user to confusing messages and possibly unintentionally executing the action multiple times if they try to refresh the page.

– Carl Meyer
May 18 ’09 at 13:28

@Carl: In most cases I’d agree, except in situations where you’re doing something like returning a search result, but still displaying the search box at the top of the page, in that case redirection is unnecessary. This may be the case with the OP’s question.

– Soviut
May 18 ’09 at 21:31

2

@Soviut: if you’re just displaying a search result, then you should be using GET, not POST.

– Carl Meyer
May 19 ’09 at 13:29

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1

As long as you have those nice comments in, I suspect it won’t ever be an issue for you.

Anyway, it’s best to name functions based on what they do so function1 could be “displayImageChoices” and function2 could be “displayImage”.

IE, function1 takes some input and displays some choices, function2 takes some input and displays an image.

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answered May 17 ’09 at 20:58

Neil TroddenNeil Trodden

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PEP8 (python.org/dev/peps/pep-0008) says: “Function names should be lowercase, with words separated by underscores as necessary to improve readability. mixedCase is allowed only in contexts where that’s already the prevailing style (e.g. threading.py), to retain backwards compatibility.”

– Andy Baker
May 18 ’09 at 8:37

That’s a good point, I was focusing on “what the names convey”, rather than camelCase/formatting conventions.

– Neil Trodden
May 18 ’09 at 9:07

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1

I’d use something similar to the built in views (object_list, object_detail, etc) where applicable. (Always a good idea)

The rest would then follow that notion (item_action) as far as possible.

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answered May 17 ’09 at 21:33

MackeMacke

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I know this is a little outdated now, but since the switch to class based views.

PEP8 (python.org/dev/peps/pep-0008) naming conventions for classes would be capitalisation of each word, with no spaces. If you still utilise the function style views, then it would be lower case function names with spaces replaced by underscores for readability.

For example with class based views:

class MyClassBasedView():

Function based

def my_function_based_view():

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answered Dec 24 ’14 at 15:56

Neil HickmanNeil Hickman

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How to make two web sites appear as one – What features are important?

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I am about to write a tender. The solution might be a PHP based CMS. Later I might want to integrate an ASP.NET framework and make it look like one site.

What features would make this relatively easy.
Would OpenId and similar make a difference?
In the PHP world Joomla is supposed to be more integrative than Druapal. What are the important differences here?
Are there spesific frameworks in ASP.NET, Python or Ruby that are more open to integration than others?

drupal web openid joomla

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asked May 17 ’09 at 20:55

OlavOlav

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The most important thing is going to be putting as much of the look-and-feel in a format that can be shared by any platforms. That means you should develop a standard set of CSS files and (X)HTML files which can be imported (or directly presented) in any of those platform options. Think about it as writing a dynamic library that can be loaded by different programs.

Using OpenID for authentication, if all of your platform options support it, would be nice, but remember that each platform is going to require additional user metadata be stored for each user (preferences, last login, permissions/roles, etc) which you’ll still have to wrangle between them. OpenID only solves the authentication problem, not the authorization or preferences problems.

Lastly, since there are so many options, I would stick to cross-platform solutions. That will leave you the most options going forward. There’s no compelling advantage IMHO to using ASP.NET if there’s a chance you may one day integrate with other systems or move to another system.

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answered May 17 ’09 at 21:09

dj_segfaultdj_segfault

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I think that most important thing is to choose the right server. The server needs to have adequate modules. Apache would be good choice as it supports all that you want, including mod_aspnet (which I didn’t test, but many people say it works).

If you think asp.net integration is certanly going to come, I would choose Windows as OS as it will certanly be easier.

You could also install reverse proxy that would decide which server to render content based on request – if user request aspx page, proxy will connect to the IIS and windoze page, if it asks for php it can connect to other server. The problem with this approach is shared memory & state, which could be solved with carefull design to support this – like shared database holding all state information and model data….

OpenID doesn’t make a difference – there are libs for any framework you choose.

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answered May 17 ’09 at 21:05

majkinetormajkinetor

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How to combine 2 LINQ into one

How to combine 2 LINQ into one

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I am trying to populate a treeview control with some info and for that I am using 2 separate LINQ statements as follows;

Dim a = From i In CustomerTable _
Group By ShipToCustName = i.Item(6), BillToCustName = i.Item(4) Into Details = Group, Count() _
Order By ShipToCustName

Dim b = From x In a _
Group By ShipToName = x.ShipToCustName Into Group, Count() _
Order By ShipToName

For Each item In b
Console.WriteLine(“Shitp To Location: ” + item.ShipToName)
For Each x In item.Group
Console.WriteLine(“…BillTo:” + x.BillToCustName)
For Each ticket In x.Details
Console.WriteLine(“……TicketNum” + ticket.Item(0).ToString)

Next
Next
Next

Is there a way to combine A and B into one query ? Any help please …

linq

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edited Dec 14 ’15 at 5:26

marc_s

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asked May 17 ’09 at 21:00

KirillKirill

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Well, really B is a single query. Remember that what comes back from a Linq statement is an IQueryable, not the actual result. This means that B combines its own expressions with that of A, but retrieval is not performed until you enumerate B. So B really is just a single query.

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answered May 17 ’09 at 21:07

spenderspender

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What is the difference between the shape and structure of an object?

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I see it used a lot in context of data. From ScottGu’s post:

One of the really powerful
capabilities provided by LINQ and
query syntax is the ability for you to
define new classes that are separate
from the data being queried, and to
then use them to control the shape and
structure of the data being returned
by the query.

What does he mean when he refers to shape of the data?

oop language-agnostic

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edited Nov 5 ’15 at 10:56

Brian Tompsett – 汤莱恩

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asked May 17 ’09 at 21:05

aleembaleemb

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I don’t think it does! Can you please give a more detailed example of what you mean?

– Neil Trodden
May 17 ’09 at 21:06

@Neil: added some context. hopefully that should make it clearer

– aleemb
May 17 ’09 at 21:27

Thanks, I know people in the know understood it, I’m just looking it from the point of view of a clueless noob – ie me! 🙂

– Neil Trodden
May 17 ’09 at 22:23

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consider shape to be the objects “api” while the structure is it’s internal implementation. In a well designed system the shape will remain static while the structure may change significantly.

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answered May 17 ’09 at 21:13

ennuikillerennuikiller

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I think these are informal terms, and the definitions are subjective. I would use “shape” to refer to how the object fits in with other objects in the system. (Compare “surface area”, which is a rough (no pun intended 🙂 measure of the complexity of the object’s interface.) I’d use “structure” to refer to how the object is designed and implemented internally.

Hence you can have classes that have a good “shape”, but a structure like crepe paper. That’s probably easier to refactor than the other way around: a poor shape, but good implementation. (I’m sure some folks would question whether the latter is even possible.)

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edited May 17 ’09 at 21:22

answered May 17 ’09 at 21:10

Dan BreslauDan Breslau

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The shape is any spatial attributes (especially as defined by outline) of the object, whereas the structure is the manner of construction of the object and the arrangement of its parts. Of course, that can apply to any type of object. 🙂

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answered May 17 ’09 at 21:10

karim79karim79

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Generally, I would consider the shape of an a class to be the public methods and properties that the class offers. The structure would be the internal constructs and representation used. In the context of the quoted material, I would take it to mean that by allowing one to define the return type of a query using anonymous or alternate named classes, you can redefine the data returned by query, constraining and transforming its shape from the original data source.

For example, say you have a user table that is related to a contacts table. Using LINQ and anonymous class as the selection, you can return a user with primary contact object without having to define a particular view; using only LINQ.

var userWithContact = from u in db.Users
select new
{
Name = u.Name,
Address = u.Contacts
.Where( c => c.Type = “self” ).First().Address
};

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answered May 17 ’09 at 22:21

tvanfossontvanfosson

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What are the disadvantages of Aspect-Oriented Programming (AOP)?

What are the disadvantages of Aspect-Oriented Programming (AOP)?

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What are the possible and critical disadvantages of Aspect-Oriented Programming?

For example: cryptic debugging for newbies (readability impact)

aop

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edited May 17 ’09 at 21:09

Thomas Owens

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user2427user2427

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Poor toolchain support – debuggers, profilers etc may not know about the AOP and so may work on code as if all the aspects had been replaced by procedural code
Code bloat – small source can lead to much larger object code as code is “weaved” throughout the code base

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answered May 17 ’09 at 21:13

MackerMacker

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I think the biggest problem is that nobody knows how to define the semantics of an aspect, or how to declare join points non-procedurally.

If you can’t define what an aspect does independently of the context in which it will be embedded, or define the effects that it has in such a way that it doesn’t damage the context in which it is embedded, you (and tools) can’t reason about what it does reliably. (You’ll note the most common example of aspects is “logging”, which is defined as “write some stuff to a log stream the application doesn’t know anything about”, because this is pretty safe). This violates David Parnas’ key notion of information hiding. One of the worst examples of aspects that I see are ones that insert synchronization primitives into code; this effects the sequence of possible interactions that code can have. How can you possibly know this is safe (won’t deadlock? won’t livelock? won’t fail to protect? is recoverable in the face of a thrown exception in a synchronization partner?) unless the application only does trivial things already.

Join points are now typically defined by providing some kind of identifier wildcarding (e.g, “put this aspect into any method named “DataBaseAccess*”. For this to work, the folks writing the affected methods have to signal the intention for their code to be aspectized by naming their code in a funny way; that’s hardly modular. Worse, why should the victim of an aspect even have to know that it exists? And consider what happens if you simply rename some methods; the aspect is no longer injected where it is needed, and your application breaks. What is needed are join point specifications which are intentional; somehow, the aspect has to know where it is needed without the programmers placing a neon sign at each usage point. (AspectJ has some control-flow related join points which seem a bit better in this regard).

So aspects are kind of interesting idea, but I think they are technologically immature. And that immaturity makes their usage fragile. And that’s where the problem lies.
(I’m a big fan of automated software engineering tools [see my bio] just not this way).

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edited Jun 13 ’14 at 23:36

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answered Dec 22 ’11 at 17:42

Ira BaxterIra Baxter

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+1, The string matching of method names is an extremely horrible (fragile) way to inject pointcuts.

– Pacerier
Jun 13 ’14 at 23:40

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I think the biggest disadvantage is using AOP well. People use it in places where it doesn’t make sense, for example, and will not use it where it does.

For example, a factory pattern is obviously something that AOP can do better, as DI can also do it well, but the observer pattern is simpler when using AOP, as is the strategy pattern.

It will be harder to unit test, esp if you do the weaving at runtime.

If weaving at runtime then you also take a performance hit.

Having a good way to model what is going on when mixing AOP with classes is a problem, as UML I don’t think is a good model at that point.

Unless you are using Eclipse then tools do have problems, but, with Eclipse and AJDT AOP is much easier.

We still use junit and nunit for example, and so have to modify our code to allow unit tests to run, when using priviledged mode AOP could do better unit tests by testing private methods also, and we don’t have to change our programs just to make them work with unit-testing. This is another example of not really understanding how AOP can be helpful, we are still chained in many ways to the past with unit-test frameworks and current design pattern implementations and don’t see how AOP could help us do better coding.

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answered May 17 ’09 at 22:04

James BlackJames Black

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Is it really harder to unit test? Shouldn’t the unit tests test the aspects and now have nothing to do with depending on how they are woven?

– Zombies
Oct 28 ’11 at 14:18

1

@Zombies – How do you test the aspects by themselves, since the only way to do that is to include them. If you weave at runtime then it has to be set up to do the weaving when the test runs.

– James Black
Oct 28 ’11 at 20:52

Humble question from a newbie: What factory pattern has with cross-cutting concerns? I mean, why AOP do it better?

– Keyne Viana
Oct 5 ’12 at 3:30

1

AspectJ is useful for more than just cross-cutting concerns. You may find this article to be useful, for example, regarding AspectJ and design patterns: homepages.cwi.nl/~storm/teaching/reader/HannemannKiczales02.pdf

– James Black
Oct 5 ’12 at 15:40

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Maintenance and Debugging. With aop, you suddenly have code that is being run at a given point ( method entry, exit, whatever ) but in just looking at the code, you have no clue that it’s even getting called, especially if the aop configuration is in another file, like xml config. If the advice causes some changes, then while debugging an application, things may look strange with no explanation. This doesn’t affect only newbies.

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answered May 17 ’09 at 21:44

digitaljoeldigitaljoel

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I would not call it a critical disadvantage, but the biggest problem I have seen is one of developer experience and ability to adapt. Not all developers yet understand the difference between declarative and imperative programming.

We make use of the policy injection application block in EntLib 4.1 pretty extensively as well as Unity for DI and it’s just not something that sinks in quickly for some people. I find my self explaining over and over again to the same people why the application is not behaving in the way they expect. It generally starts off them explaining something and me saying “see that declaration above the method.” 🙂 Some people get it right away, love it and become extremely productive — others struggle.

Learning curve is not unique to AOP, but it seems to have a higher learning curve that other things that your average developer encounters.

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answered May 17 ’09 at 21:15

JP AliotoJP Alioto

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With regard to the maintenance/debugging argument, aspect-oriented programming tends to go hand-in-hand with all the other aspects of agile software-development practices.

These practices tend to remove debugging from the picture, replacing it with unit testing and test-driven development.

In addition, it may be much easier to maintain a small, clear code footprint with advice than a large, incomprehensible code footprint without advice (the advice being the thing that transforms a large, incomprehensible code footprint into a small, clear code footprint).

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answered May 17 ’09 at 22:12

yfeldblumyfeldblum

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Because the power of AOP, if there is a bug your crosscutting, it can cause to widespread problems. On the otherhand, someone might change the join points in a program – e.g., by renaming or moving methods – in ways that the aspect writer did not expect, with unintended consequences. One advantage of modularizing crosscutting concerns is enabling one programmer to affect the entire system easily.

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answered Nov 20 ’10 at 12:12

hhafezhhafez

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