Salesforce Organization File and Data Storage usage find out by using APEX

To find org file and data usage copy below class and save 

Step 1:

public class OrgFileSpaceLimit{

public void fileParseMethod(){

Datetime TDate = datetime.now();
String fileStorage = 'Used File Space</td><td class="dataCol">';
String dataStorage = 'Used Data Space</td><td class="dataCol">';
String endpointUrl = 'https://immu-dev-dev-ed.my.salesforce.com/00D90000000iCmb'; //-- endpointUrl = sales force instance/organization id-------

Http http = new Http();
HttpRequest req = new HttpRequest();
req.setEndpoint(endpointUrl);
req.setMethod('GET');
req.setHeader('Cookie','sid='+UserInfo.getSessionId());
HTTPResponse res = http.send(req);
String pageData = res.getBody();

//------Parsing the html body to fetch file and data usage and storing in a string-------------// 

String fileSize = pageData.substringAfter(fileStorage).left(5).remove('&n')+' MB ' + ' and percent used ' + pageData.substringAfter(fileStorage).substringBetween('(',')');
String DataSize = pageData.substringAfter(dataStorage).left(5).remove('&n')+ ' MB ' + ' and percent used ' + pageData.substringAfter(dataStorage).substringBetween('(',')');

//-----send email with out any condition-------------//

 
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
mail.setToAddresses(new string[] {'skimran1038@gmail.com'});
mail.setSubject('Organization File and Data Storage Usage Space');
mail.setPlainTextBody('Total Used File Space by '+ TDate +' is '+ fileSize + '\n \n' + 'Total Used Data Space by ' + TDate + ' is ' + DataSize);
mail.setReplyTo('skimran1038@gmail.com');
mail.setSenderDisplayName(UserInfo.getUserEmail());
Messaging.SendEmailResult[] resp = Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
}
}

Step 2:

Go to developer console or work bench executive below code or schedule the class

OrgFileSpaceLimit org = new OrgFileSpaceLimit();

    org.fileParseMethod();

STREAMING API IN SALESFORCE

What is Streaming API ?

To put it simple, streaming API is a mechanism which monitors data changes in Salesforce based on the SOQL query you define, and if the condition matches, sends push notifications to all the subscribed clients.

Since Summer ’12, streaming API is available in any API-valid organizations. You can test it to see how it works in the Developer Edition.

Also, push notifications can be received from a page in a Salesforce application, a server and a page outside of Salesforce, and Java client.

For this example, we will use a Visualforce page to receive push notifications.

What is a Push Notification ?

Push notification is the technology that allows you to send information without the clients’ request when an event occurs in the server.

In "pull technology" where information is sent in response to the clients’ request, the page will not be updated unless the user intentionally refreshes or changes the page. Therefore, in order for the client to know an event has occurred in the server, you need to send a page request periodically and receive the result (called polling).

On the server side, a series of processes to generate an HTTP connection, send information, and close the connection by each and every polling is necessary. iI polling is performed by many clients, then it would consume a huge amount of server resources and network bandwidth.

If you use Ajax that sends a request asynchronously by restricting one part of the page, you can reduce some network bandwidth consumption. However, this is not effective as you still need to respond to the requests that are sent regularly regardless of the server event.

I would not recommend you to use polling frequently, especially if you are using Salesforce, because polling from outside of Salesforce, such as SOAP/REST API consumes API request counts.

This is when streaming API becomes useful.

Note : Before going to code we need some java script files 

STEP 1 :  Go through the URL  and download the zip file  (https://github.com/cometd/cometd)

STEP 2 :  Extract the zip file and follow the below process 

              Next, upload the following files as static resources (Your Name > Setup > Develop > Static 

              Resources > New)

                FILE                                                 NAME

             cometd.js                                             cometd

             jquery-1.5.1.js                                      jquery

             json2.js                                                 json2

             jquery.cometd.js                                  jquery_cometd

STEP 3 :  we have to create one push topic on object 

            

            Go to the developer console or workbench copy the below code and executive it 

            PushTopic pushTopic = new PushTopic();

       pushTopic.ApiVersion = 29.0;
       pushTopic.Name = 'pushOnAccout';
       pushTopic.Description = 'All records for the Account object';
       pushtopic.Query = 'SELECT Id, Name,Phone FROM Account';
       insert pushTopic;
       System.debug('Created new PushTopic: '+ pushTopic.Id);

STEP 4 : 

                Visual force Page :

               
<apex:page controller="StreamingApiController"> 

<apex:includeScript value="{!$Resource.cometd}"/>
<apex:includeScript value="{!$Resource.jquery}"/>
<apex:includeScript value="{!$Resource.json2}"/>
<apex:includeScript value="{!$Resource.jquery_cometd}"/>

<script type="text/javascript">

(function($){
    $(document).ready(function() {

    $.cometd.init({
        url: window.location.protocol+'//'+window.location.hostname+'/cometd/29.0/',
        requestHeaders: { Authorization: 'OAuth {!$Api.Session_ID}'}
    });
    $.cometd.subscribe('/topic/pushOnAccout', function(message) {
        var list = new Array();
    list.push(message.channel,message.data.sobject.Name,message.data.sobject.Id,message.data.event.type,message.data.event.createdDate);

Visualforce.remoting.Manager.invokeAction('{!$RemoteAction.StreamingApiController.methodTosendMessage}',list,function(result,event){

},{escape:true});

    $('#content').append('<p>Notification: ' +
        'Channel: ' + JSON.stringify(message.channel) + '<br></br>' +
        'Record name: ' + JSON.stringify(message.data.sobject.Name) + '<br></br>' +
        'ID: ' + JSON.stringify(message.data.sobject.Id) + '<br></br>' +
        'Event type: ' + JSON.stringify(message.data.event.type)+'<br></br>' +
       'Created: ' + JSON.stringify(message.data.event.createdDate) + '</p>');
    });
});
})(jQuery)

</script>

<body>
<div id="content">
<p>Notifications should appear here...</p>
</div>
</body>
</apex:page>

           Controller : 

            public class StreamingApiController {

                @Remoteaction()

                public static void methodTosendMessage(List<String> streamData){

                    Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();

                    mail.setToAddresses(new string[] {'xxxxxxxxx@gmail.com'});

                    mail.setCcAddresses(new string[] {'xxxxxxx@gmail.com'});

                    mail.setSubject('Record ' + streamData[3]);

                    mail.setPlainTextBody('Record Details ' + streamData);

                    mail.setReplyTo('xxxxxxxxxx@gmail.com');

                    mail.setSenderDisplayName(UserInfo.getUserEmail());

                    Messaging.SendEmailResult[] res = Messaging.sendEmail(new             

                    Messaging.SingleEmailMessage[] { mail });       

               }

           }

Note : 

            visual force page is used to monitor the Real time data 

           Controller is used to send a mail , Real time data to  user 's

         

TEST CLASSES IN SALESFORCE

Test.startTest() and Test.stopTest() are very useful when your test class hits Sales force Governor Limits.

The code inside Test.startTest() and Test.stopTest() have new set of Sales force Governor Limits.

As a good practice, make sure initializing the variables, fetching records, creating and updating records are coded before Test.startTest() and Test.stopTest()

and calling the controllers for code coverage is done inside Test.startTest() and Test.stopTest().

The code before Test.startTest() and after Test.stopTest() have new set of Sales force Governor Limits and code between Test.startTest() and Test.stopTest()

have new set of Sales force Governor Limits.


EX:

private class TestClass {
    static testMethod void test() {
        Test.startTest();
        Call the controller for code coverage
        Test.stopTest();
    }
}

Normal Test class:

public class demoTestClass(){ 

public void demoMethod(){

.

.

.

}

}

@isTest

public class TestMethodClass {

static testMethod void testMethod() {

demoTestClass newDemo = demoTestClass();

newDemo.demoMethod();

}

}

Test Class for Callout :

To cover callout in class we have to write a test class first which is used for dummy callout and that test class has to use in our original test class

so total we have to write 2 test classes

1. To call dummy web service

2. Real test class



Class :

-----
public class CalloutClass {

public static HttpResponse getInfoFromExternalService() {

HttpRequest req = new HttpRequest();

req.setEndpoint('https://graph.facebook.com/oauth/access_token');

req.setMethod('GET');

Http h = new Http();

HttpResponse res = h.send(req);

return res;

}

}

Test class for dummy web service :

@isTest

global class MockHttpResponseGenerator implements HttpCalloutMock {

global HTTPResponse respond(HTTPRequest req) {

System.assertEquals('https://graph.facebook.com/oauth/access_token', req.getEndpoint());

System.assertEquals('GET', req.getMethod());

HttpResponse res = new HttpResponse();

res.setHeader('Content-Type', 'application/json');

res.setBody('{"foo":"bar"}');

res.setStatusCode(200);

return res;

}

}

Test class for CalloutClass class:

@isTest

private class CalloutClassTest {

@isTest static void testCallout() {

Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());

HttpResponse res = CalloutClass.getInfoFromExternalService();

String contentType = res.getHeader('Content-Type');

System.assert(contentType == 'application/json');

String actualValue = res.getBody();

String expectedValue = '{"foo":"bar"}';

System.assertEquals(actualValue, expectedValue);

System.assertEquals(200, res.getStatusCode());

}

}

Test class for PageReffernce :

Class:

-----

public PageReference add() {

insert technology;

return null;

}

Test Method:

-----------

public static testMethod void testMyController() {

PageReference pageRef = Page.yourPageName;

Test.setCurrentPage(pageRef);

MyController controller = new MyController();

controller.add();

}

Test Class for batch apex:

@isTest

private class myTestClass {

static testMethod void myTestMethod() {

generateTestData();

Test.startTest();

DemoBatchClass batchObj = new DemoBatchClass();

batchObj.execute();

Test.stopTest();

}

}