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異步處理的主要優點包括：

用戶效率

可擴展性

更高的限制

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Use Future Methods

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Future methods?

?必須是靜態方法，并且只能返回void類型。

指定的參數必須是原始數據類型，原始數據類型的數組或原始數據類型的集合

不能將標準或自定義對象作為參數

一種常見的模式是向該方法傳遞要異步處理的記錄ID列表

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Create an Apex class that uses the @future annotation to update Account records

AccountProcessor.apxc

public class AccountProcessor {@futurepublic static void countContacts(Set<id> setId){List<Account> lstAccount = [select Number_of_Contacts__c,(select id from contacts ) from account where id in :setId ];for( Account acc : lstAccount ){List<Contact> lstCont = acc.contacts ;acc.Number_of_Contacts__c = lstCont.size();}update lstAccount;} }

AccountProcessorTest.apxc

@IsTest public class AccountProcessorTest {public static testmethod void TestAccountProcessorTest(){Account a = new Account(name='Test Account');Insert a;Contact cont = New Contact();cont.FirstName ='Bob';cont.LastName ='Masters';cont.AccountId = a.Id;Insert cont;set<ID> setAccId = new Set<ID>();setAccId.add(a.id);Test.startTest();AccountProcessor.countContacts(setAccId);Test.stopTest();Account ACC = [select Number_of_Contacts__c from Account where id = :a.id LIMIT 1];System.assertEquals ( Integer.valueOf(ACC.Number_of_Contacts__c) ,1);}}

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總結

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