Tag Archives: Apex

Apex Callable Interface

Biswajeet   December 23, 2018   No Comments on Apex Callable Interface

In Winter’19 release Salesforce introduced Callable interface in apex. The interface enables developers to use a common interface to build loosely coupled integrations between Apex classes or triggers, even for code in separate packages.

This interface has one method call(String action, Map args). It helps developer to call a method dynamically with the help of “Type” class.

Example:

public class SampleCallable implements Callable {
    
    //Method 1
    public String method1(String stringValue) {
        return 'Welcome ' + stringValue;
    }
    
    //Method 2
    public Decimal method2(Integer integerValue) {
        return integerValue + 100;
    }
    
    //Callable interface method
    public Object call(String action, Map<String, Object> args) {
        switch on action {
            when 'method1' {
                return this.method1((String)args.get('stringValue'));
            }
            when 'method2' {
                return this.method2((Integer)args.get('integerValue'));
            }
            when else {
                return null;
            }
        }
    }
}

Execute:

Callable c = (Callable)Type.forName('SampleCallable').newInstance();
system.debug(c.call('method1', new map<String,Object>{'stringValue' => 'Biswajeet'}));
system.debug(c.call('method2', new map<String,Object>{'integerValue' => 5}));

Cacheable Apex Method

Biswajeet   December 20, 2018   No Comments on Cacheable Apex Method

To improve the performance of the lightning component cache Salesforce introduced storable (cacheable) in Winter’19 release. In API version 44.0 and later, you can mark an Apex method as storable (cacheable) instead of using setStorable() on every JavaScript action that calls the Apex method to centralize your caching notation for a method in the Apex class.

Here is an example to cache data returned from an Apex method for lightning component, annotate the Apex method with @AuraEnabled(cacheable=true).

Apex Class:

public class SampleAuraController {
    
    @AuraEnabled(cacheable = true)
    public static List<Account> getDirectCustomerAccount() {
        List<Account> accList = new List<Account>();
        accList = [SELECT Id, Name, Type, Industry, Phone
                   FROM Account WHERE Type = 'Customer - Direct'];
        return accList;
    }
}

Lightning Component:

<aura:component controller="SampleAuraController" implements="flexipage:availableForAllPageTypes,force:appHostable">
    
    <!--Declare Event Handlers-->
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
    
    <!--Declare Attributes-->
    <aura:attribute name="accList" type="Account[]"/>
    
    <!--Component Start-->
    <div class="slds-m-around_xx-large">
        <table class="slds-table slds-table_cell-buffer slds-table_bordered slds-table_col-bordered">
            <thead>
                <tr class="slds-line-height_reset">
                    <th class="slds-text-title_caps" scope="col">
                        <div class="slds-truncate" title="Account Name">Account Name</div>
                    </th>
                    <th class="slds-text-title_caps" scope="col">
                        <div class="slds-truncate" title="Account Type">Account Type</div>
                    </th>
                    <th class="slds-text-title_caps" scope="col">
                        <div class="slds-truncate" title="Industry">Industry</div>
                    </th>
                    <th class="slds-text-title_caps" scope="col">
                        <div class="slds-truncate" title="Phone">Phone</div>
                    </th>
                </tr>
            </thead>
            <tbody>
                <aura:iteration items="{!v.accList}" var="acc">
                    <tr class="slds-hint-parent">
                        <th data-label="Account Name" scope="row">
                            <div class="slds-truncate" title="{!acc.Name}"><a href="javascript:void(0);" tabindex="-1">{!acc.Name}</a></div>
                        </th>
                        <td data-label="Account Type">
                            <div class="slds-truncate" title="{!acc.Type}">{!acc.Type}</div>
                        </td>
                        <td data-label="Industry">
                            <div class="slds-truncate" title="{!acc.Industry}">{!acc.Industry}</div>
                        </td>
                        <td data-label="Phone">
                            <div class="slds-truncate" title="{!acc.Phone}">{!acc.Phone}</div>
                        </td>
                    </tr>
                </aura:iteration>
            </tbody>
        </table>
    </div>
    <!--Component End-->
</aura:component>

Lightning JS Controller:

({
    doInit : function(component, event) {
        var action = component.get("c.getDirectCustomerAccount");
        action.setCallback(this, function(response) {
            var state = response.getState();
            if(state === "SUCCESS"){
                var result = response.getReturnValue();
                component.set("v.accList", result);
            }
        });
        $A.enqueueAction(action);
    }
})

Output:

Create Or Update Custom Metadata Type Using Apex

Biswajeet   November 6, 2018   No Comments on Create Or Update Custom Metadata Type Using Apex
  • We cannot Create or Update Custom Metadata records using DML statement.
  • We can Create or Update Custom Metadata records using apex Metadata deployment.
  • To do the Metadata deployment using apex, it requires a callback class with Metadata.DeployCallback interface.

Sample Metadata Deployment Callback Class:

public class CustomMetadataCallBack implements Metadata.DeployCallback {
    
    //Inteface method 
    public void handleResult(Metadata.DeployResult result, Metadata.DeployCallbackContext context) {
        if (result.status == Metadata.DeployStatus.Succeeded) {
            //Success
        } else {
            //Failed
        }
    }
}

Here I have created a Custom Metadata Type (Tax Setting), to save Tax related information for an Application.

Here I have created a class with Metadata.DeployCallback interface, and two methods to create and update Custom Metadata Type records.

Apex Class:

public class CustomMetadataUtils implements Metadata.DeployCallback {
    
    //Inteface method 
    public void handleResult(Metadata.DeployResult result, Metadata.DeployCallbackContext context) {
        if (result.status == Metadata.DeployStatus.Succeeded) {
            //Success
            System.debug('Success Result-' + result);
        } else {
            //Failed
            System.debug('Failed Result-' + result);
        }
    }
    
    //Create Custom Metadata record
    public static void createCustomMetadata(String metdataName, String label, Map<String, Object> metadataFieldValueMap){
        String recordDevName = label.replaceAll(' ', '_');
        Metadata.CustomMetadata cMetadata = new Metadata.CustomMetadata();
        cMetadata.fullName = metdataName + '.' + recordDevName;
        cMetadata.label = label;
        
        for(String key : metadataFieldValueMap.keySet()){
            Metadata.CustomMetadataValue cMetadataValue = new Metadata.CustomMetadataValue();
            cMetadataValue.Field = key;
            cMetadataValue.Value = metadataFieldValueMap.get(key); 
            cMetadata.values.add(cMetadataValue);
        }
        
        Metadata.DeployContainer mdContainer = new Metadata.DeployContainer();
        mdContainer.addMetadata(cMetadata);
        CustomMetadataUtils callback = new CustomMetadataUtils();
        Id jobId = Metadata.Operations.enqueueDeployment(mdContainer, callback);
    }
    
    //Update Custom Metadata record
    public static void updateCustomMetadata(String metdataName, String recordDevName, String label, Map<String, Object> metadataFieldValueMap){
        Metadata.CustomMetadata cMetadata = new Metadata.CustomMetadata();
        cMetadata.fullName = metdataName + '.' + recordDevName;
        cMetadata.label = label;
        
        for(String key : metadataFieldValueMap.keySet()){
            Metadata.CustomMetadataValue cMetadataValue = new Metadata.CustomMetadataValue();
            cMetadataValue.Field = key;
            cMetadataValue.Value = metadataFieldValueMap.get(key); 
            cMetadata.values.add(cMetadataValue);
        }
        
        Metadata.DeployContainer mdContainer = new Metadata.DeployContainer();
        mdContainer.addMetadata(cMetadata);
        CustomMetadataUtils callback = new CustomMetadataUtils();
        Id jobId = Metadata.Operations.enqueueDeployment(mdContainer, callback);
    }
}

To test above class methods, you can run below code in developer console.
Create Custom Metadata Record:

Map<String, Object> metadataFieldValueMap = new Map<String, Object>();
metadataFieldValueMap.put('TaxPercent__c', 4);
CustomMetadataUtils.createCustomMetadata('SalesTaxSetting__mdt', 'Value Added Tax', metadataFieldValueMap);

Update Custom Metadata Record:

Map<String, Object> metadataFieldValueMap = new Map<String, Object>();
metadataFieldValueMap.put('TaxPercent__c', 15);
CustomMetadataUtils.updateCustomMetadata('SalesTaxSetting__mdt','Value_Added_Tax', 'Value Added Tax',metadataFieldValueMap);

After deployed the Custom Metadata, you can check the deployment status.
Go to Setup | Deploy | Deployment Status | Check the deployment status