Storage & Retrival of file in Datacenter in cloudsim

[priyank sharma]

hello all !!!

I am fairly new user of Cloudsim. Can anyone help me to store and retrieve a file in datacenter of

cloudsim3.0??

Priyank

[Mario Henrique Souza Pardo]

Hi Dear Priyank,

   try this code, maybe can help you. It's based on CloudsimExample6.java I guess:

            int num_user = 1;

            Calendar calendar = Calendar.getInstance();

            boolean trace_flag = false;

            CloudSim.init(num_user, calendar, trace_flag);

            //******************************************************

            //Creating 3 Storages

            HarddriveStorage hd1 = new HarddriveStorage(1024);

            HarddriveStorage hd2 = new HarddriveStorage(1024);

            HarddriveStorage hd3 = new HarddriveStorage(1024);

            System.out.println("* * *");

            System.out.println("Used disk space on hd1=" + hd1.getCurrentSize());

            System.out.println("Used disk space on hd2=" + hd2.getCurrentSize());

            System.out.println("Used disk space on hd3=" + hd3.getCurrentSize());

            System.out.println("* * *");

            //Creating 3 Files

            //Attention: This is the "org.cloudbus.cloudsim.File" class!!

            File file1 = new File("file1.dat", 300);

            File file2 = new File("file2.dat", 300);

            File file3 = new File("file3.dat", 300);

            hd1.addFile(file1);

            hd2.addFile(file2);

            hd3.addFile(file3);

            //************************************************************

            LinkedList<Storage> hdList = new LinkedList<Storage>();

            hdList.add(hd1);

            hdList.add(hd2);

            hdList.add(hd3);

            //You can add files into datacenter by Datacenter.addFile method too.

            //Look inside createDatacenter() method!! 

            Datacenter mydc = createDatacenter("MyDC", hdList);

            DatacenterBroker broker = createBroker();

            int brokerId = broker.getId();

            CloudSim.startSimulation();

            System.out.println("* * *");

            System.out.println("Used disk space on hd1=" + hd1.getCurrentSize());

            System.out.println("Used disk space on hd2=" + hd2.getCurrentSize());

            System.out.println("Used disk space on hd3=" + hd3.getCurrentSize());

            System.out.println("* * *");

--------------------------------------------

Hope that can be useful for you. I'm available to help if you need.

Regards!

Mário Pardo

ICMC-USP / São Carlos / Brazil

mhp...@icmc.usp.br

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[.]

Hello Mario
Thank you so much for your reply.It worked.
Now I want to know
1. how to create more than one user in cloudsim. along with that,
2. I want to provide attribute based encryption(ABE) to the files
which i have added according to your code. just like the permissions
provided to the file in Unix/Linux.

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[Mario Henrique Souza Pardo]

Hello Dear Priyank,

1. By default, CloudSim considers DatacenterBroker like a client from datacenter. So, if you want to really have a client entity you need to program it for your own. You can start extending SimEntity class, programming the required abstract methods and after you can create your own client events codes, launch and handle these events. This will create your client effect desired for your simulated environment.

   If you want to use CloudSim ready structures, so, I suggest you to create a lot of Datacenterbrokers and manage them like clients for your environment.

2. To the second question I suggest you to create a new attribute in CloudSim File class or in FileAttribute class (I don't work with files in my jobs, so, I don't know much about this subject). I'm basing my explanation looking in the CloudSim API. 

   So, create the refered attribute, its setter and getter methods and then, to create the desired permission system effect in your simulation program, will be necessary to make modifications in the class that handles directly the calls for file access. I think (but I'm not sure about that) that can be HardriveStorage or Datacenter, but is better you take a careful look in that.

   As you see, I'm not so good with this part of simulator, so, consider my ideas like suggestions or opinions, ok?

  I desire success in your implementation.

        Regards!

Mário Pardo

ICMC-USP / São Carlos / Brazil

mhp...@icmc.usp.br

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[.]

thanks a lot mario.

can u please help me in executing this file which i have attached.

actually when i am trying to execute it i am getting error.

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[Mario Henrique Souza Pardo]

Hello Priyank,

first... I have a question for you: What is CloudFile class? This is not a default class from CloudSim API specification (I checked it). I guess it's a custom implementation of your project, isn't it?

second... I identified that you are trying to use a next() method with java.util.Iterator, so, what about to use a for-each and handle the list in a different mode?

Look at this code adaptation I have done for you...

-----------------------------------------

public CloudFile getCloudFile(String fileName) {

// check first whether file name is valid or not

CloudFile obj = null;

if (fileName == null || fileName.length() == 0) {

Log.printLine(super.getName() + ".getFile(): Warning - invalid " + "file name.");

return obj;

}

Iterator <CloudFile> it =  fileList.listIterator();

int size = 0;

int index = 0;

boolean found = false;

//CloudFile tempFile = null;

                

// find the file in the disk

//while (it.hasNext()) {

//tempFile = it.next();

                        

                for (CloudFile tempFile : fileList){

size += tempFile.getSize();

if (tempFile.getName().equals(fileName)) {

found = true;

obj = tempFile;

break;

}

index++;

}

// if the file is found, then determine the time taken to get it

if (found) {

                    //If you wants to use get and set method, fileList needs to be an ArrayList instance

obj = fileList.get(index);

double seekTime = getSeekTime(size);

double transferTime = getTransferTime(obj.getSize());

// total time for this operation

obj.setTransactionTime(seekTime + transferTime);

}

return obj;

}

----------------------------------------- 

   I hope these tips help you to find the way.

   Regards!

Mário Pardo

ICMC-USP / São Carlos / Brazil

mhp...@icmc.usp.br

[.]

thanks Mario !!!  I will try this and let you know.

[Shredha Kishore]

Hey
Can anyone please tell me how to retrieve the file stored in the harddiskdrive via cloudsim3.0.
To store, I used the above code.

[Shredha Kishore]

[elh elhem]

Hi mario, 

Please this code

// if the file is found, then determine the time taken to get it

if (found) {

                    //If you wants to use get and set method, fileList needs to be an ArrayList instance

obj = fileList.get(index);

double seekTime = getSeekTime(size);

double transferTime = getTransferTime(obj.getSize());

// total time for this operation

obj.setTransactionTime(seekTime + transferTime);

}

return obj;

is responsable for retreiving the file by the VM??

Thanks for your help.

[beenish jadoon]

hello mario 

i am having difficulties in implementing project on cloudsim

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[Swas]

Hi all,

Can anyone tell me where exactly a file is stored when we call harddrivestorage.addfile() method