Magento 2 get current visitor Id for compare items

Override the ListCompare block.

Create Vendor/Module/etc/di.xml on your custom module

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Catalog\Block\Product\Compare\ListCompare" type="Vendor\Module\Block\Product\Compare\ListCompare" />
</config>

<?xml version="1.0"?>

</config>

Create Vendor/Module/Block/Product/Compare/ListCompare.php

<?php
namespace Vendor\Module\Block\Product\Compare;

class ListCompare extends \Magento\Catalog\Block\Product\Compare\ListCompare
{
	public function __construct(
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Framework\Url\EncoderInterface $urlEncoder,
        \Magento\Catalog\Model\ResourceModel\Product\Compare\Item\CollectionFactory $itemCollectionFactory,
        \Magento\Catalog\Model\Product\Visibility $catalogProductVisibility,
        \Magento\Customer\Model\Visitor $customerVisitor,
        \Magento\Framework\App\Http\Context $httpContext,
        \Magento\Customer\Helper\Session\CurrentCustomer $currentCustomer,
        \Magento\Framework\ObjectManagerInterface $objectManager,
        array $data = []
    ) {
    	$this->objectManager = $objectManager;
        parent::__construct($context,$urlEncoder,$itemCollectionFactory,$catalogProductVisibility,$customerVisitor,$httpContext,$currentCustomer,$data);
    }

	/**
     * Retrieve Product Compare items collection
     *
     * @return \Magento\Catalog\Model\ResourceModel\Product\Compare\Item\Collection
     */
    public function getItems()
    {
    	if ($this->_items === null) {
            $this->_compareProduct->setAllowUsedFlat(false);

            $this->_items = $this->_itemCollectionFactory->create();
            $this->_items->useProductItem(true)->setStoreId($this->_storeManager->getStore()->getId());

            if ($this->httpContext->getValue(\Magento\Customer\Model\Context::CONTEXT_AUTH)) {
                $this->_items->setCustomerId($this->currentCustomer->getCustomerId());
            } elseif ($this->_customerId) {
                $this->_items->setCustomerId($this->_customerId);
            } else {
            	/****** Custom Code ******/
                $sessionManager  = $this->objectManager->create('\Magento\Framework\Session\SessionManagerInterface');
                $visitor = $sessionManager->getVisitorData();
                if(!$this->_customerVisitor->getId() && isset($visitor['visitor_id'])){
                	$visitorid = $visitor['visitor_id'];
                }else{
                	$visitorid = $this->_customerVisitor->getId();
                }
            	/****** Custom Code ******/
                $this->_items->setVisitorId($visitorid);
            }

            $this->_items->addAttributeToSelect(
                $this->_catalogConfig->getProductAttributes()
            )->loadComparableAttributes()->addMinimalPrice()->addTaxPercents()->setVisibility(
                $this->_catalogProductVisibility->getVisibleInSiteIds()
            );
        }
        return $this->_items;
    }
}

<?php

namespace Vendor\Module\Block\Product\Compare;

class ListCompare extends \Magento\Catalog\Block\Product\Compare\ListCompare

{

public function __construct(

\Magento\Catalog\Block\Product\Context $context,

\Magento\Framework\Url\EncoderInterface $urlEncoder,

\Magento\Catalog\Model\ResourceModel\Product\Compare\Item\CollectionFactory $itemCollectionFactory,

\Magento\Catalog\Model\Product\Visibility $catalogProductVisibility,

\Magento\Customer\Model\Visitor $customerVisitor,

\Magento\Framework\App\Http\Context $httpContext,

\Magento\Customer\Helper\Session\CurrentCustomer $currentCustomer,

\Magento\Framework\ObjectManagerInterface $objectManager,

array $data = []

) {

$this->objectManager = $objectManager;

parent::__construct($context,$urlEncoder,$itemCollectionFactory,$catalogProductVisibility,$customerVisitor,$httpContext,$currentCustomer,$data);

}

/**

* Retrieve Product Compare items collection

* @return \Magento\Catalog\Model\ResourceModel\Product\Compare\Item\Collection

public function getItems()

{

if ($this->_items === null) {

$this->_compareProduct->setAllowUsedFlat(false);

$this->_items = $this->_itemCollectionFactory->create();

$this->_items->useProductItem(true)->setStoreId($this->_storeManager->getStore()->getId());

if ($this->httpContext->getValue(\Magento\Customer\Model\Context::CONTEXT_AUTH)) {

$this->_items->setCustomerId($this->currentCustomer->getCustomerId());

} elseif ($this->_customerId) {

$this->_items->setCustomerId($this->_customerId);

} else {

/****** Custom Code ******/

$sessionManager = $this->objectManager->create('\Magento\Framework\Session\SessionManagerInterface');

$visitor = $sessionManager->getVisitorData();

if(!$this->_customerVisitor->getId() && isset($visitor['visitor_id'])){

$visitorid = $visitor['visitor_id'];

}else{

$visitorid = $this->_customerVisitor->getId();

}

/****** Custom Code ******/

$this->_items->setVisitorId($visitorid);

}

$this->_items->addAttributeToSelect(

$this->_catalogConfig->getProductAttributes()

)->loadComparableAttributes()->addMinimalPrice()->addTaxPercents()->setVisibility(

$this->_catalogProductVisibility->getVisibleInSiteIds()

);

}

return $this->_items;

}

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