I'm trying to run SDN Multiple controllers in omnet.
I change some code in OFA_switch.cc .. I uncommented the first section and comment the lower section of code as illustrated.
Since there is not a module "controller" but instead there is a submodule "controller" in each domain controller
I got runtime error: Error processing command OPEN_ACTIVE:remote address and port must be specified...
Can you please help me?
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There is no reason to rewrite the code. It is totally fine to get that parameter from the INI file. The problem is that the remote address must be correctly specified. You can use the direct IP address there (if you know it) or it is also possible to specify a module path to the given node. My guess is that it is specified as controller which assumes that there is a module named controller at the top level. I assume you have put these components into submodules so the controller module is now inside a submodule. You may use submodulename.controller or may use relative module path something like this^.^.controller (I'm not sure on the exact number of (^) parent navigations. It depends on how deep the application module is inside the node.
Related
the project I involved has composer require fengqi/hanzi into the vendor folder, which is used to convert simplified Chinese and traditional Chinese
For people who want to take a look at the package https://github.com/fengqi/hanzi
Inside the vendor folder, the package has the following example directory structure:
vendor/
--hanzi/
----src/
------Hanzi.php
------HanziDict.php
------Pinyin.php
The specific file HanziDict.php I want to modify has a really simple code structure:
<?php namespace fengqi\Hanzi;
return array (
'啊' => '啊',
...
...
'sample char A'=>'sample char B'
);
The github repository of the package suggested that I can insert any "char C => char D" inside the php file if I found the certain chars are missing from the dictionary.
But I believe I should not directly put the code inside vendor folder since it will be override after update.
So, my problem is how I can properly override/extend this file in Laravel (such as insert "char C => char D" into the array).
I already read and know how to properly extend class outside of vendor folder but did not find any useful information about other types of php files. I wonder if there is certain ways or rules to do with this kinds of files.
Ideally I want to achieve something like:
outside of the vendor folder, I have an expanded ExtraHanziDict.php. So it can always build upon the vendor dict.php.
The following links is the vendor class code (only fewer simple functions to read the dict and convert character)
https://github.com/fengqi/hanzi/blob/master/src/Hanzi.php (apology for throwing the code)
Unfortunately, in this case, there's no easy way to change the dictionary. As you correctly guessed you should never change the content of the vendor folder as it's not committed to version control.
In your specific case what you can do is:
Ask the repository mantainer to add an api that allows you to add new dictionaries at runtime.
Fork the repository, change what you need, and use that instead (see loading a custom git repository with composer). If you think your changes can be useful to others open a Pull request on the original repository.
There's no much logic on the repository you linked. Each package you add to your composer.json file is a burden, code that doesn't belongs to you and you MUST blindly thrust (what if at some point the repository is hacked and some malicious code hidden into it?). Just create your own service to do such a simple task.
Let's say I want to know that slab.h is required to use kmalloc(). I search for kmalloc in the documentation and get this page https://www.kernel.org/doc/html/latest/core-api/mm-api.html?highlight=kmalloc#.
So I know it's related to memory management and "the slab cache", but I see no mention of slab.h.
What's the correct way of determining what header needs to be included in your module program ?
Get to know one of the Linux kernel cross-reference sites (LXR), which can tell you where things are defined.
i.e.:
https://elixir.bootlin.com/linux/latest/ident/kmalloc
I'm trying to add a new route using the netlink package. The equivalent I need is ip route add $P1_NET dev $IF1 src $IP1 table $T1. The issue is that I don't know what field corresponds to the dev parameter. Is there a mapping somewhere or can I use the interface index instead its name ("dev")?
Looking at the link you sent, I'd guess IifName. And looking at the code seems to confirm that.
I have baked a File model and controller with default actions. Now I am trying to add an display function which can be used to show images in controlled manner.
I want to protect images so that display function can check does the user have an permissions to view image (image directory is not in a webroot).
I haven't been able to make it work, but when I started from the scratch I managed to find out that really minimal function did work.
Working function looks like this:
public function display($id) {
$this->response->file(ROOT.DS.'img'.DS.'noimage.jpg');
return $this->response;
}
When I add example:
$test=$this->File->findById($id);
to the starting of the function everything breaks.
--> http://www.example.com/files/display/1
The requested file /var/www/example.com/www/img/image.jpg was not found or not readable
Error: The requested address '/files/display/1' was not found on this server.
I have tried with debug zero, file can be found and is readable, obviously because the function without findById works.
Any ideas?
cakephp 2.4.3
You path is totally wrong.
Did you debug() what ROOT.DS.'img'.DS.'noimage.jpg' actually holds?
I bet all the money of the world that you would probably find the solution yourself if you did
The img folder is most likely in webroot
WWW_ROOT . 'img' . DS . 'noimage.jpg'
Note that paths usually end with a DS so no need to add it again.
So if it really is an image folder in ROOT:
ROOT . 'img' . DS . 'noimage.jpg'
Also note that you can easily check if a path is valid using
file_exists()
If the file has the correct file permissions this should return true.
EDIT:
$this->File->...: File is not a good choice for a model name as it collides with the existing core class in Utility. You need to be a little bit more creative with your model naming scheme.
I know this doesn't exactly match the form of www.example.com/class/function/ID/, but what I want to display to the user would make more sense.
This is what I would like to do:
www.example.com/project/id/item/item_id/
So, an example would be:
www.example.com/project/5/item/198237/
And this would be the behavior:
www.example.com/project/ --> This would show a list of projects (current implementation)
www.example.com/project/5/ --> This would show a list of items on project 5 (current implementation)
www.example.com/project/5/item/ --> This wouldn't really mean anything different than the line above. (Is that bad?)
www.example.com/project/5/item/198237/ --> This would show details for item 198237.
So, each item is directly associated with one and only one project.
The only way I can think how to do this is to bloat the "project" controller and parse the various parameters and control ALL views from that "project" controller. I'd prefer not to do this, because the model and view for an "item" are truly separate from the model and view of a "project."
The only other solution (that I am currently implementing and don't prefer) is to have the following:
www.example.com/project/5/
www.example.com/item/198237/
Is there any way to build a hierarchical URL as I showed at the beginning without bloating the "project" controller?
There are 3 options, sorted by how practical they can be:
Use URI Routing. Define a regular expression that will use a specific controller/method combination for each URL.
Something like that could help you, in routes.php:
$route['project/'] = 'project/viewall';
$route['project/(.+)'] = 'project/view/$1';
$route['project/(.+)/item/'] = 'project/view/$1';
$route['project/(.+)/item/(.+)'] = 'item/view/$2';
That is, considering your controllers are item and project respectively. Also note that $n in the value corresponds to the part matched in the n-th parenthesis.
Use the same controller with (or without) redirection. I guess you already considered this.
Use redirection at a lower level, such as ModRewrite on Apache servers. You could come up with a rule similar to the one in routes.php. If you are already using such a method, it wouldn't be a bad idea to use that, but only if you are already using such a thing, and preferably, in the case of Apache, in the server configuration rather than an .htaccess file.
You can control all of these options using routes.php (found in the config folder). You can alternatively catch any of your URI segments using the URI class, as in $this->uri->segment(2). That is if you have the URL helper loaded. That you can load by default in the autoload.php file (also in the config folder).