template_redirect Hook: strange behavior

Hey Guys,

I have been working on a plugin that uses the template_redirect action to render a custom page on the WordPress front-end.

The template_redirect action works as expected as it renders the page on the front-end correctly, but the problem is the template_redirect action is being called twice and its calling my function twice, which is making this unnecessary 2nd call, affecting performance.

I have traced the code with xdebug and noticed that this second call to the template_redirect hook happens when I echo the body output HTML.

I look forward to any suggestions how I can prevent this second call to the template_redirect hook (or why this happens), or if there is any other approach to display this front-end page without having my my_page_render() function called more than once.

These are the relevant parts of the code I have:

File: /plugins/my_plugin/main.php

<?php
/*
Plugin Name: My Plugin Name
*/
include WP_PATH.'/plugins/my_plugin/classes/plugin_setup_class.php';
new plugin_setup_class();

File: /plugins/my_plugin/classes/plugin_setup_class.php

<?php
class plugin_setup_class {
  public $loader;
  public function __construct()
  {
    if(!is_admin())
    {
      $this->loader = new public_loader();
      $this->init();
     }
  }
  public function init()
  {
    add_action('template_redirect', array($this->loader, 'my_page_render'));
  }
}

File: /plugins/my_plugin/classes/public_loader.php

<?php
class public_loader.php {
  public function my_page_render()
  {
    global $wp_query, $wp;
    if($wp_query->query_vars['post_type'] == 'my_post_type' ||
	preg_match("#".URL_PREFIX."[/]([A-Za-z0-9]+)/?#", $wp->request, $matches))
    {
       /* Code that gets data here */
       /* Then */
       include MY_PLUGIN_PATH . '/header.php';
       echo $html_body;  // When this echo line runs, the hook template_redirect
       // fires again and executes this whole function again.
       // Need to run this function only once, not twice.
       include MY_PLUGIN_PATH.'/footer.php';
       exit;
    }
  }
}