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Sample JOSS application

This appendix contains a sample JOSS application that uses the HCP HSwift API and and JOSS SDK to perform a series of operations in HCP.

Assumptions

The application makes these assumptions:

  • The HCP system has a tenant named europe.
  • Keystone is installed and has a Keystone HCP tenant account named europe
  • The Keystone tenant has an admin user with the user name lgreen and the password p4ssw0rd
  • The tenant has a user account with user name lgreen and password p4ssw0rd.
  • By default, versioning is disabled for new containers.
  • The local file system has folders named input and output that are located in the current working folder for the application.
  • The input directory contains two files, Q4_2012.ppt and Q3_2012.ppt.

What the application does

The sample application shown in this appendix uses the HSwift API to:

  1. Create a container named finance in the context of the tenant named europe (the service point)
  2. List the container for the europe tenant that are owned by the user lgreen
  3. Add an ACL to the finance container
  4. Store an object named quarterly_rpts/Q4_2012.ppt in the finance container, associating custom metadata with the object in the process
  5. Store an object named quarterly_rpts/Q3_2012.ppt in the finance container
  6. Retrieve the object named quarterly_rpts/Q4_2012.ppt and write its content to a new file on the local file system
  7. Add an ACL to the container named finance for the account named rsilver
  8. Retrieve object quarterly_rpts/Q3_2012.ppt and write its content to a new file on the local file system
  9. Delete the quarterly_rpts/Q4_2012.ppt and quarterly_rpts/Q3_2012.ppt object from the finance container
  10. Delete the quarterly_rpts folder from the finance container (HCP created this folder automatically when the first object was stored)
  11. Delete the finance container

Required library

To run the sample application presented in this appendix, you need to have installed the following library:

JOSS application

Here's the same JOSS application.

/**
* This sample Java application shows how to use the HCP
*HSwift API, which is compatible with JOSS SDK. The
*application uses the JOSS SDK.
*/

 

package com.hds.hcp.examples;

 

import org.javaswift.joss.client.factory.AccountConfig;
import org.javaswift.joss.client.factory.AccountFactory;
import org.javaswift.joss.client.factory.AuthenticationMethod;
import org.javaswift.joss.model.Account;
import org.javaswift.joss.model.Container;
import org.javaswift.joss.model.StoredObject;

 

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class HSwiftSampleApp {

 

/**

* @param args

*/

 

public static void main(String[] args) {

 

/*

* Initialize access credentials for the HSwift client.

*/

 

// base64 of HCP user name: "lgreen"

String accessKey = "bGdyZWVu";

// md5 of HCP user password: "p4ssw0rd"

String secretKey = "2a9d119df47ff993b662a8ef36f9ea20";

 

/*

* Build the JOSS account connection to be used

* for communication with HCP. The Keystone must have *an admin user lgreen with password p4ssw0rd and *tenant europe. The AuthUrl must point to the keystone *server.

*/

 

AccountConfig accountConfig = new AccountConfig();

accountConfig.setAuthUrl("http://api.keystone.server.com:5000/v2.0/token");

accountConfig.setUsername(accessKey);

accountConfig.setPassword(secretKey);

accountConfig.setAuthenticationMethod(AuthenticationMethod.KEYSTONE);

Account europe = new AccountFactor(accountConfig).createAccount();

 

/*

* Now that the HSwift Client is created for HCP

*usage, proceed with some operations.

*/

 

String containerName = "finance";

try {

 

/*
* Create a new container. With HCP, the container *name does not need to be globally unique. It needs *to be unique only within the HCP service point *that is, the HCP tenant.
*/

 

System.out.println("Creating container " + containerName + "\n");
Container finance = europe.getContainer(containerName);
finance.create();

 

/*
* List the containers you own at the service point.
*/

 

System.out.println("Containers:");
for (Container container : europe.list()) {
System.out.println(" * " + container.getName());
}

 

System.out.println();

 

/*
* Add an ACL to the container to give read to a user with the specified user name.
*/


finance.setContainerRights(null, "pdgray");

 

/*
* Upload a couple of objects to the container from *files on the local file system.
*/

 

String firstFileName = "input/Q4_2012.ppt";
String firstObjectName = "quarterly_rpts/Q4_2012.ppt";
StoredObject Q4_2012 = finance.getObject(firstObjectName);

 

System.out.println("Uploading first object to HCP from a file\n");

Q4_2012.uploadObject(new FileInputStream(firstFileName));

 

// Add metadata for first object
Q4_2012.setAndSaveMetadata("Author", "P.D. Gray");
Q4_2012.setAndSaveMetadata("Audit_Date", "2013-02-23");

 

// Write a second object without metadata.
System.out.println("Uploading second object to HCP from a file\n");
String secondFileName = "input/Q3_2012.ppt";
String secondObjectName = "quarterly_rpts/Q3_2012.ppt";
StoredObject Q3_2012 = finance.getObject(secondObjectName);
Q3_2012.uploadObject(new FileInputStream(secondFileName));

 

/*
* List objects in the container with prefix *quarterly_rpts/Q. The objects listing is limited *to 1,000 items per request.
*/


System.out.println("Objects:");
for (StoredObject object : finance.list("quarterly_rpts/Q", null, 1000)) {
     System.out.println(" * " + object.getName() + " " +
          "(size = " + object.getContentLength() + ")");
}

 

System.out.println();

 

/*
* Download an object. When you download an object, * you get all the object metadata and a stream from * which to read the object content.
*/

 

System.out.println("Downloading the first object\n");
InputStream responseStream = Q4_2012.downloadObjectAsInputStream();

 

// Write the content to a file named Q4_2012.ppt in the output folder.
FileOutputStream dataFile = new FileOutputStream("output/Q4_2012.ppt");
// Keep reading bytes until the end of stream is reached.
byte buffer[] = new byte[2048];
int readSize;
while (-1 != (readSize = responseStream.read(buffer))) {
     dataFile.write(buffer, 0, readSize);
}
dataFile.close();

 

/*
* Add an ACL to the container which gives full control to the rsilver account.
*/

 

finance.setContainerRights("rsilver", "rsilver");

 

/*
* Perform a download of the second object.
*/

 

System.out.println("Checking the second object");
responseStream = Q3_2012.downloadObjectAsInputStream();

 

// Download it to a new file.
System.out.println("Downloading new revision\n");
FileOutputStream dataFile2 = new FileOutputStream("output/Q3_2012_Rev2.ppt");
// Keep reading bytes until the end of stream is reached.
byte readBuffer[] = new byte[2048];
int conditionalReadSize;
while (-1 != (conditionalReadSize
          = responseStream.read(readBuffer))) {
     dataFile2.write(readBuffer, 0, conditionalReadSize);
}

dataFile2.close();

 

/*
* Delete the objects.
*/

 

System.out.println(
     "Deleting the objects created by this sample application\n");
Q4_2012.delete();
Q3_2012.delete();

 

/*
* Delete the folder.
*/

 

System.out.println(
          "Deleting the folder created when the first object was stored\n");
StoredObject folder = finance.getObject("quarterly_rpts");
folder.delete();

 

/*
* Delete the container.
*/

 

System.out.println("Deleting the finance container\n");
finance.delete();

 

} catch (IOException ioe) {
     System.out.println(
          "Caught an IOException while trying to create an object or read "
               + "from an internal buffer.");
     System.out.println("Error Message: " + ioe.getMessage());
}

}

}

 

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