How to write Future method in Apex | How to make an API callout using future annotation?
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- เผยแพร่เมื่อ 2 มี.ค. 2021
- In this video Shrey has explained how to write Future method in apex and process to make API callout using future annotation.
For Understand the Future Method watch this video:
• Understanding Future M...
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The reason why sObjects can’t be passed as arguments to future methods is because the sObject might change between the time you
call the method and the time it executes. In this case, the future method will get the old sObject values and might overwrite them. To
work with sObjects that already exist in the database, pass the sObject ID instead (or collection of IDs) and use the ID to perform a query
for the most up-to-date record. The following example shows how to do so with a list of IDs.
global class FutureMethodRecordProcessing
{
@future
public static void processRecords(List recordIds)
{
// Get those records based on the IDs
List accts = [SELECT Name FROM Account WHERE Id IN :recordIds];
// Process records
}
}
Crystal clear. Thanks for sharing.
Simple and crystal clear
Thanks, Shrey!
Thanks for sharing knowledge
because the sObject might change between the time you call the method and the time it executes. In this case, the future method will get the old sObject values and might overwrite them
Excellent explanation! Keep up the good work!
Thanks a lot!
Thank you a lot
Thanks for the sharing the concept in a easy way.
As we know that sobject can't be used as a parameter in future method. This is because, any sobject record might be updated in between the job is queued and start it's execution. Their will be a possibility of sobject record overwriting. Or we might be performing the task using the old records.
Absolutely correct, Subrata! Well done 👍🏻
Hello and thank you for the update. So if I want to use an Apex Trigger when a Case becomes "Closed", what would be your recommandation? Thanks
Great video shrey!!
Thanks!
@Salesforce Hulk - Why I can't call the future method from the batch class, but I can call batch class within a batch class under the finish method as both are asynchronous?
Batch apex is also execute when the resources are available. So lets suppose there are 1000 records we are updating each record in batch apex and it first excute the 200 record. Then lets suppose resources are hold by some another classes and in the meantime records has changed. so when resources are available it continues to execute batch records. So in that case it will change or overwrite the sobject values?
Salesforce Guru
Nice
You can't pass sobjects as parameters to future method because when you execute one future method then there are two main lifecycle points of that method. First is it will be queued and whenever resources will be available then it will be executed (2nd point).
So when it is queued and when it is actually executed, in between this time that sobjects can be updated or may have been changed there values. So that's why Salesforce doesn't allow to pass sobjects.
Correct 👍🏻
hi..I dont find your videos related to queueable apex..can i plz give me a links to those videos if available?
Is there any issues coming up writing a Future method inside a Queueable Class? nd how to do that , please do a video or please reply with an examplry use-case or scenario. Thanks
1st comment
Thanks for sharing your knowledge
Keep going
All the Best
@salesforce Hulk, why we cannot call a future method from another future method? I mean what is the exact reason behind this ??
We cannot pass sobject as parameter. As the object value can be updated in between while execution.
Correct 👍🏻
iam using the same code but getting {error={code=101, info=You have not supplied an API Access Key. [Required format: access_key=YOUR_ACCESS_KEY], type=missing_access_key}, success=false} what is the issue?
How to create an apxc file please?
FATAL_ERROR System.NullPointerException: Attempt to de-reference a null object
Decimal conversionRate = (Decimal) mMap.get('INR'); //at this line showing above error
How should we test this callout???? Because future method doesnt return anything
Why future method can't call another future method
What is the behaviour behind scenes I mean what happens with governor limits when I use future method
?
Hi Mario, By using Future Method in Asynchronous way, Governor limits can be increased ie SOQL increased to 200 and HEap size to 12MB from 6MB.
The reason why sObjects can’t be passed as arguments to future methods is because the sObject might change between the time you call the method and the time it executes. In this case, the future method will get the old sObject values and might overwrite them.
Exactly, Komal. You are absolutely correct 👍🏻