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public class ComplexSalesforceClass implements Comparable, Database.Batchable<sObject>, Queueable, Database.AllowsCallouts {
    
    // Interface implementations
    
    // Comparable interface
    public Integer compareTo(Object o) {
        ComplexSalesforceClass other = (ComplexSalesforceClass)o;
        // Compare logic based on some criteria
        if (/*some condition*/) {
            return 1;
        } else if (/*another condition*/) {
            return -1;
        } else {
            return 0;
        }
    }
    
    // Batchable interface
    public Database.QueryLocator start(Database.BatchableContext context) {
        return Database.getQueryLocator('SELECT Id, Name FROM Account WHERE CreatedDate >= :System.today().addDays(-30)');
    }
    
    public void execute(Database.BatchableContext context, List<Account> scope) {
        List<Contact> contactsToUpdate = new List<Contact>();
        for (Account acc : scope) {
            // Example logic: Update related contacts
            List<Contact> contacts = [SELECT Id, LastName FROM Contact WHERE AccountId = :acc.Id];
            for (Contact con : contacts) {
                con.LastName = 'UpdatedLastName';
                contactsToUpdate.add(con);
            }
        }
        update contactsToUpdate;
    }
    
    public void finish(Database.BatchableContext context) {
        // Batch finish logic, if any
    }
    
    // Queueable interface
    public void execute(QueueableContext context) {
        // Example logic: Create a Task
        Task newTask = new Task(
            Subject = 'Queueable Task Created',
            Status = 'Completed'
        );
        insert newTask;
    }
    
    // AllowsCallouts interface
    public void execute(CallableContext context) {
        // Example callout logic
        Http http = new Http();
        HttpRequest req = new HttpRequest();
        req.setEndpoint('https://api.example.com');
        req.setMethod('GET');
        HttpResponse res = http.send(req);
        // Process response as needed
    }
    
    // Custom methods
    
    // Example method
    public void performCustomOperation() {
        // Custom operation logic here
    }
    
    // Constructor
    public ComplexSalesforceClass() {
        // Constructor logic here
    }
}

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import { LightningElement, wire, track } from 'lwc';
import getAccountsByIndustry from '@salesforce/apex/AccountController.getAccountsByIndustry';
import refreshAccounts from '@salesforce/apex/AccountController.refreshAccounts';

import { subscribe, MessageContext } from 'lightning/messageService';
import ACCOUNT_UPDATE_CHANNEL from '@salesforce/messageChannel/AccountUpdateChannel__c';

export default class AccountManager extends LightningElement {
    @track accounts = [];
    @track error;
    @track industryFilter = '';
    @track isLoading = false;

    subscription = null;

    @wire(MessageContext)
    messageContext;

    // Reactive Apex call based on industryFilter
    @wire(getAccountsByIndustry, { industry: '$industryFilter' })
    wiredAccounts({ error, data }) {
        if (data) {
            this.accounts = data;
            this.error = undefined;
        } else if (error) {
            this.error = error;
            this.accounts = [];
        }
    }

    connectedCallback() {
        this.subscribeToMessageChannel();
    }

    subscribeToMessageChannel() {
        if (this.subscription) return;
        this.subscription = subscribe(
            this.messageContext,
            ACCOUNT_UPDATE_CHANNEL,
            (message) => this.handleAccountUpdate(message)
        );
    }

    handleAccountUpdate(message) {
        if (message?.industry) {
            this.industryFilter = message.industry;
        }
    }

    handleIndustryChange(event) {
        this.industryFilter = event.target.value;
    }

    async handleRefresh() {
        this.isLoading = true;
        try {
            const updatedAccounts = await refreshAccounts({ industry: this.industryFilter });
            this.accounts = updatedAccounts;
            this.error = undefined;
        } catch (err) {
            this.error = err;
        } finally {
            this.isLoading = false;
        }
    }

    get hasAccounts() {
        return this.accounts && this.accounts.length > 0;
    }
}

public with sharing class AppConfigSupport {

	private static AppConfig__c testConfig = null;
	
	public static AppConfig__c getAppConfig()
	{
		if(Test.isRunningTest() && testConfig!=null) return testConfig;
		
		AppConfig__c theobject = AppConfig__c.getInstance('default');
		if(theObject==null || Test.isRunningTest()) 
		{
			theObject = new AppConfig__c();
			theObject.name = 'default';
			theObject.EnableDiagnostics__c = (Test.isRunningTest())? true: false;
			theObject.AppEnabled__c = true;
			if(!Test.isRunningTest()) Database.Insert(theobject);
			else testconfig = theObject;
		}
		return theObject;
	}
	
	public static Boolean diagnosticsEnabled
	{ 
		get
		{
			return GetAppConfig().EnableDiagnostics__c;
		}
	}
	
	public static Boolean appEnabled
	{
		get
		{
			return GetAppConfig().AppEnabled__c;
		}
	}

}

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