Repository for a service that fetches additional data to a post

Repository.php

<?php

namespace PublicFunctionOrg\WordPress;

class Repsitory {
	
	public function __construct($service){
		$this->service = $service; // service api implementation class
	}
	
	private function getTransientKey($post_id){
		return "my_data_key_$post_id";
	}
	
	private function getPostMetaKey(){
		return "my_data_key";
	}
	
	public function getData($post_id){
		
		// cached data
		$data = get_transient($this->getTransientKey($post_id);
		if(false !== $data) return $data;
		
		// fetch fresh data from service
		try{
			$data = $this->service->fetch($post_id);
			
			// update cache
			set_transient($this->getTransientKey($post_id), $data, 60*5);
			// update long-term cache
			update_post_meta($post_id, $this->getPostMetaKey(), $data);
			
			return $data;
			
		} catch(\Exception $e){
			error_log($e->getMessage());
			
			// use long-term cache
			$data = get_post_meta($post_id, $this->getPostMetaKey(), true);
			if(false !== $data) return $data;
		}
							  
		return new \WP_Error("Data not available");
	}
	
}